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1

Expression of mouse metallothionein genes in tobacco  

SciTech Connect

We have expressed a mouse metallothionein (NT) gene in tobacco under control of the cauliflower mosaic virus (CaMV) 35S promoter and a pea ribulose-1,5-bisphosphate carboxylase small subunit (rbcS) gene promoter. Seedlings in which MT gene expression is driven by the 35S promoter are resistant to toxic levels of cadmium. Mature plants carrying the 35S-MT gene accumulate less Cd in their leaves when exposed to low levels of Cd in laboratory growth conditions. Plants with the rbcS-MT construction express this gene in a light-regulated and tissue-specific manner, as expected. Moreover, the MT levels in leaves in these plants are about 20% of those seen in 35S-MT plants. These plants are currently being tested for Cd resistance. In addition, a small field evaluation of 35S-MT lines for Cd levels is being evaluated. These experiments will address the possibility of using MTs to alter Cd levels in crop species.

Maiti, I.B.; Yeargan, R.; Wagner, G.J.; Hunt, A.G. (Univ. of Kentucky, Lexington (USA))

1990-05-01

2

Inheritance and expression of the mouse metallothionein gene in tobacco  

SciTech Connect

Genetically engineered seedlings obtained from self-fertilized transgenic tobacco (Nicotiana tabacum) contained and expressed the mouse metallothionein and kanamycin resistance marker genes and were more tolerant to cadmium stress than untransformed controls. Cadmium accumulation in leaves of transgenic seedlings exposed to a low, field-like Cd concentration (0.02 micromolar) was about 20% lower than that in untransformed controls. Genetic analysis of R1 and R2 progeny showed inheritance of the marker gene to be as a dominant Mendelian trait. These results suggest the possibility of developing transgenic plants with modified tolerance to heavy metal stress and food crops having lower Cd content.

Maiti, I.B.; Wagner, G.J.; Yeargan, R.; Hunt, A.G. (Univ. of Kentucky, Lexington (USA))

1989-11-01

3

Fine mapping of a mouse metallothionein gene metal response element.  

PubMed Central

Metal-regulated transcription of metallothionein (MT) genes in higher eucaryotes involves multiple copies of a highly conserved 17-base-pair metal-regulatory element (MRE). We have assayed by transient transfection the ability of mouse MT-I element d (MREd) to confer metal responsivity to constructs containing the mouse MT-I TATA box and the bacterial chloramphenicol acetyltransferase indicator gene. A single copy of MREd works bidirectionally to afford a three- to fourfold induction, and dual copies act cooperatively to yield a 10- to 20-fold response. Element d responds to the same spectrum of heavy metals as doses the complete MT gene promoter. The sequences involved in induction by metals were delineated by analyzing point mutations in MREd. While nucleotides of the highly conserved core sequence TGCPuCXC are critical, substitutions in the less conserved regions affect the induction response only marginally. These sequences include residues of a potential Sp1-binding site, suggesting that if Sp1 binds to MREd, it has little if any role in induction by metals. Images

Culotta, V C; Hamer, D H

1989-01-01

4

Regulation, linkage, and sequence of mouse metallothionein I and II genes.  

PubMed Central

The mouse metallothionein II (MT-II) gene is located approximately 6 kilobases upstream of the MT-I gene. A comparison of the sequences of mouse MT-I and MT-II genes (as well as those of other mammals) reveals that the coding regions are highly conserved even at "silent" positions but that the noncoding regions and introns are extremely divergent between primates and rodents. There are four blocks of conserved sequences in the promoters of mouse MT-I, mouse MT-II, and human MT-IIA genes; one includes the TATAAA sequence, and another has been implicated in regulation by heavy metals. Mouse MT-I and MT-II mRNAs are induced to approximately the same extent in vivo in response to cadmium, dexamethasone, or lipopolysaccharide. Mouse MT-I and MT-II genes are regulated by metals but not by glucocorticoids after transfection into HeLa cells. Images

Searle, P F; Davison, B L; Stuart, G W; Wilkie, T M; Norstedt, G; Palmiter, R D

1984-01-01

5

Expression of a mouse metallothionein-Escherichia coli. beta. -galactosidase fusion gene (MT-. beta. gal) in early mouse embryos  

SciTech Connect

The authors have microinjected DNA containing the inducible mouse metallothionein-I (MT-I) promoter, coupled to the structural gene for Escherichia coli {beta}-galactosidase (lacZ), into the pronuclei of one-cell mouse embryos. A qualitative histochemical assay, with 5-bromo-4-chloro-3-indolyl {beta}-D-galactopyranoside (X-Gal) as a substrate, was used to detect expression of lacZ at several preimplantation stages. They observed staining indicative of exogenous {beta}-galactosidase activity in 5-17% of DNA-injected embryos assayed at preimplantation stages after 16-24 h treatment with ZnSO{sub 4}. Thus, lacZ can be used as an indicator gene for promoter function during early mouse embryogenesis, and the incorporation of the MT-I promoter into fusion genes can be a useful means of controlling the expression of exogenous genes in preimplantation mouse embryos.

Stevens, M.E.; Meneses, J.J.; Pedersen, R.A. (Univ. of California, San Francisco (United States))

1989-08-01

6

Serial Analysis of Gene Expression Identifies Metallothionein-II as Major Neuroprotective Gene in Mouse Focal Cerebral Ischemia  

Microsoft Academic Search

We applied serial analysis of gene expression (SAGE) to study differentially expressed genes in mouse brain 14 hr after the induction of focal cerebral ischemia. Analysis of 60,000 tran- scripts revealed 83 upregulated and 94 downregulated tran- scripts (more than or equal to eightfold). Reproducibility was demonstrated by performing SAGE in duplicate on the same starting material. Metallothionein-II (MT-II) was

George Trendelenburg; Konstantin Prass; Josef Priller; Krisztian Kapinya; Andreas Polley; Claudia Muselmann; Karsten Ruscher; Ute Kannbley; Armin O. Schmitt; Stefanie Castell; Frank Wiegand; Andreas Meisel; Ulrich Dirnagl

2002-01-01

7

Distal regulatory elements from the mouse metallothionein locus stimulate gene expression in transgenic mice.  

PubMed Central

DNA regions of 10 and 7 kb that flank the mouse metallothionein II (MT-II) and MT-I genes, respectively, were combined with a minimally marked MT-I (MT-I*) gene and tested in transgenic mice. This construct resulted in (i) position-independent expression of MT-I* mRNA and copy number-dependent expression, (ii) levels of hepatic MT-I mRNA per cell per transgene that were about half that derived from endogenous MT-I genes, (iii) appropriate regulation by metals and hormones, and (iv) tissue distribution of transgene mRNA that resembled that of endogenous MT-I mRNA. These features were not observed when MT-I* was tested without the flanking regions. These MT-I flanking sequences also improved the expression of rat growth hormone reporter genes, with or without introns, that were under the control of the MT-I promoter. Moreover, they enhanced expression from two of four heterologous promoters/enhancers that were tested. Deletion analysis indicated that regions known to have DNase I-hypersensitive sites were necessary but not sufficient for high-level expression. These data suggest that the DNA regions flanking the mouse MT-I and MT-II genes have functions like the locus control regions described for other genes. Images

Palmiter, R D; Sandgren, E P; Koeller, D M; Brinster, R L

1993-01-01

8

Silencing of metallothionein-I gene in mouse lymphosarcoma cells by methylation  

PubMed Central

Metallothionein-I (MT-I) gene is silenced by methylation of CpG islands in mouse lymphosarcoma P1798 cells but not in the thymus, the cell type from which the tumor was derived. Bisulfite genomic sequencing revealed that all 21 CpG dinucleotides present within ?216 bp to +1 bp with respect to transcription start site are methylated in the tumor cell line, but none is methylated in the thymus. The lymphosarcoma cells induced MT-I in response to heavy metals only after demethylation with 5-azacytidine (5-AsaC). The electrophoretic mobility shift assay using specific oligonucleotide probes showed that the key transcription factors regulating MT-I gene (e.g., MTF-1, Sp 1 and MLTF/USF) are active in P1798 cells. In vivo footprinting of the proximal promoter region showed that none of the metal regulatory elements (MREs) or MLTF/USF are occupied in response to heavy metals. Demethylation of the lymphosarcoma cells with 5-AzaC resulted in constitutive footprinting at MLTF/ARE, and zinc-inducible footprinting at MRE-c, MRE-d and MRE-e sites. Demethylation of just 10 ? 20% of the CpG islands was sufficient to render the gene inducible by cadmium or zinc. The MT-I induction persisted in the cancer cells for several generations even after withdrawal of 5-AzaC from the culture medium.

Majumder, Sarmila; Ghoshal, Kalpana; Li, Zhiling; Bo, Yuan

2008-01-01

9

A nuclear factor binds to the metal regulatory elements of the mouse gene encoding metallothionein-I.  

PubMed Central

The ability of vertebrate metallothionein (MT) genes to be induced by heavy metals is controlled by metal regulatory elements (MREs) present in the promoter in multiple, non-identical copies. The binding specificity of the mouse L-cell nuclear factor(s) that interact with the element MREd of the mouse MT-I gene was analyzed by in vitro footprinting, protein blotting, and UV cross-linking assays. In vitro footprinting analyses revealed that synthetic oligodeoxynucleotides (oligomers) corresponding to the metal regulatory elements MREa, MREb, MREc, MREd and MREe of the mouse MT-I gene, as well as the MRE4 of the human MT-IIA gene and the MREa of the trout MT-B gene, all competed for the nuclear protein species binding to the MREd region of the mouse MT-I gene, the MREe oligomer being the weakest competitor. In addition, protein blotting experiments revealed that a nuclear protein of 108 kDa, termed metal element protein-1 (MEP-1), which specifically binds with high affinity to mouse MREd, binds with different affinities to the other mouse MRE elements, mimicking their relative transcriptional strength in vivo: MREd greater than or equal to MREa = MREc greater than MREb greater than MREe greater than MREf. Similarly, human MRE4 and trout MREa bind to MEP-1. A protein similar in size to MEP-1 was also detected in HeLa-cell nuclear extracts. In UV cross-linking experiments the major protein species, complexed with mouse MREd oligomers, migrated on a denaturating gel with an apparent Mr of 115,000 and was detected using each of the mouse MRE oligomers tested. These results show that a mouse nuclear factor can bind to multiple MREs in mouse, trout, and human MT genes. Images

Labbe, S; Prevost, J; Remondelli, P; Leone, A; Seguin, C

1991-01-01

10

Expression of mouse metallothionein in the cyanobacterium Synechococcus PCC7942  

Microsoft Academic Search

A cDNA encoding mouse metallothionein was cloned into the shuttle vector pUC303, creating a translational fusion with the bacterial chloramphenicol acetyltransferase gene. The resulting fusion protein has been expressed in the cyanobacteriumSynechococcus PCC7942. Cyanobacterial transformants expressed mouse metallothionein-specific mRNA species as detected by RNA slot blots. In addition, the transformants expressed a unique cadmium ionbinding protein corresponding to the predicted

J L Erbe; K B Taylor; L M Hall

1996-01-01

11

Immunological characterization of metallothioneins in mouse LMTK cells and in a variant resistant to cadmium  

SciTech Connect

A cadmium-resistant variant isolated from mouse fibroblast LMTK cells can grow in the presence of 40 ..mu..M Cd/sup 2 +/. This variant retained its properties in the absence of selecting agent. Induction of metallothionein was measured in cell extracts by radioimmunoassay. The maximum amount of metallothioneins in the cells was reached after 36 hours. The cadmium resistant variant produced two times more metallothionein than the wild-type when exposed to 10-20 ..mu..MCd/sup 2 +/. By Ouchterlony double diffusion, the metallothioneins from cultured cells formed a line of partial identity with the mouse liver serotype and a line of complete identity with one of the two mouse kidney serotypes. These observations raise the possibility of a tissue-specific expression of metallothionein genes.

Maiti; I.; Mbikay, M.; Marengo, C.; Thirion, J.-P.

1982-07-01

12

Human metallothionein genes are clustered on chromosome 16.  

PubMed Central

The metallothioneins are a family of heavy-metal binding proteins of low molecular weight. They function in the regulation of trace metal metabolism and in the protection against toxic heavy metal ions. In man, the metallothioneins are encoded by at least 10-12 genes separated into two groups, MT-I and MT-II. To understand the genomic organization of these genes and their involvement in hereditary disorders of trace metal metabolism, we have determined their chromosomal location. Using human-mouse cell hybrids and hybridization probes derived from cloned and functional human MT1 and MT2 genes, we show that the functional human genes are clustered on human chromosome 16. Analysis of RNA from somatic cell hybrids indicated that hybrids that contained human chromosome 16 expressed both human MT1 and MT2 mRNA, and this expression is regulated by both heavy metal ions and glucocorticoid hormones. Images

Karin, M; Eddy, R L; Henry, W M; Haley, L L; Byers, M G; Shows, T B

1984-01-01

13

Influenza virus infection induces metallothionein gene expression in the mouse liver and lung by overlapping but distinct molecular mechanisms.  

PubMed

Metallothionein I (MT-I) and MT-II have been implicated in the protection of cells against reactive oxygen species (ROS), heavy metals, and a variety of pathological and environmental stressors. Here, we show a robust increase in MT-I/MT-II mRNA level and MT proteins in the livers and lungs of C57BL/6 mice exposed to the influenza A/PR8 virus that infects the upper respiratory tract and lungs. Interleukin-6 (IL-6) had a pronounced effect on the induction of these genes in the liver but not the lung. Treatment of the animals with RU-486, a glucocorticoid receptor antagonist, inhibited induction of MT-I/MT-II in both liver and lung, revealing a direct role of glucocorticoid that is increased upon infection in this induction process. In vivo genomic footprinting (IVGF) analysis demonstrated involvement of almost all metal response elements, major late transcription factor/antioxidant response element (MLTF/ARE), the STAT3 binding site on the MT-I upstream promoter, and the glucocorticoid responsive element (GRE1), located upstream of the MT-II gene, in the induction process in the liver and lung. In the lung, inducible footprinting was also identified at a unique gamma interferon (IFN-gamma) response element (gamma-IRE) and at Sp1 sites. The mobility shift analysis showed activation of STAT3 and the glucocorticoid receptor in the liver and lung nuclear extracts, which was consistent with the IVGF data. Analysis of the newly synthesized mRNA for cytokines in the infected lung by real-time PCR showed a robust increase in the levels of IL-10 and IFN-gamma mRNA that can activate STAT3 and STAT1, respectively. A STAT1-containing complex that binds to the gamma-IRE in vitro was activated in the infected lung. No major change in MLTF/ARE DNA binding activity in the liver and lung occurred after infection. These results have demonstrated that MT-I and MT-II can be induced robustly in the liver and lung following experimental influenza virus infection by overlapping but distinct molecular mechanisms. PMID:11713267

Ghoshal, K; Majumder, S; Zhu, Q; Hunzeker, J; Datta, J; Shah, M; Sheridan, J F; Jacob, S T

2001-12-01

14

Stability and conformational dynamics of metallothioneins from the antarctic fish Notothenia coriiceps and mouse.  

PubMed

The structural properties and the conformational dynamics of antarctic fish Notothenia coriiceps and mouse metallothioneins were studied by Fourier-transform infrared and fluorescence spectroscopy. Infrared data revealed that the secondary structure of the two metallothioneins is similar to that of other metallothioneins, most of which lack periodical secondary structure elements such as alpha-helices and beta-sheets. However, the infrared spectra of the N. coriiceps metallothionein indicated the presence of a band, which for its typical position in the spectrum and for its sensitivity to temperature was assigned to alpha-helices whose content resulted in 5% of the total secondary structure of the protein. The short alpha-helix found in N. coriiceps metallothionein showed an onset of denaturation at 30 degrees C and a T(m) at 48 degrees C. The data suggest that in N. coriiceps metallothionein a particular cysteine is involved in the alpha-helix and in the metal-thiolate complex. Moreover, infrared spectra revealed that both proteins investigated possess a structure largely accessible to the solvent. The time-resolved fluorescence data show that N. coriiceps metallothionein possesses a more flexible structure than mouse metallothionein. The spectroscopic data are discussed in terms of the biological function of the metallothioneins. PMID:11835501

Capasso, Clemente; Abugo, Omoefe; Tanfani, Fabio; Scire, Andrea; Carginale, Vincenzo; Scudiero, Rosaria; Parisi, Elio; D'Auria, Sabato

2002-02-15

15

Drosophila melanogaster metallothionein genes: Selection for duplications  

SciTech Connect

The metallothionein genes of Drosophila melanogaster, Mtn and Mto, may play an important role in heavy-metal detoxification. In order to investigate the possibility of increased selection for duplications of these genes in natural populations exposed to high levels of heavy metals, I compared the frequencies of such duplications among flies collected from metal-contaminated and non-contaminated orchards in Pennsylvania, Tennessee, and Georgia. Contaminated of collection sites and of local flies was confirmed by atomic absorption spectrosphotometry. Six-nucleotide-recognizing restriction enzyme analysis was used to screen 1666 wild third chromosomes for Mtn duplications. A subset (327) of these lines was screened for Mto duplications: none were found. Cadmium tolerance test performed on F{sub 2} progeny of wild females failed to detect a difference in tolerance levels between flies from contaminated orchards and flies from control orchards. Estimates of sequence diversity among a subsample (92) of the chromosomes used in the duplication survey, including all 27 Mtn duplication chromosomes, were obtained using four-nucleotide-recognizing restriction enzyme analysis.

Lange, B.W.

1989-01-01

16

Molecular Evolution of Drosophila Metallothionein Genes  

PubMed Central

The metallothionein genes of Drosophila melanogaster, Mtn and Mto, may play an important role in heavy metal detoxification. Several different tandem duplications of Mtn have been shown to increase cadmium and copper tolerance, as well as Mtn expression. In order to investigate the possibility of increased selection for duplications of these genes in natural populations exposed to high levels of heavy metals, we compared the frequencies of such duplications among flies collected from metal-contaminated and non-contaminated orchards in Pennsylvania, Tennessee and Georgia. Restriction enzyme analysis was used to screen 1666 wild third chromosomes for Mtn duplications and a subset (327) of these lines for Mto duplications. The frequency of pooled Mtn duplications found ranged from 0% to 20%, and was not significantly higher at the contaminated sites. No Mto duplications were identified. Estimates of sequence diversity at the Mtn locus among a subsample (92) of the duplication survey were obtained using four-cutter analysis. This analysis revealed a low level of polymorphism, consistent with both selection at the Mtn locus, and a fairly recent origin for the duplications. To further examine this hypothesis, we sequenced an Mtn allele of Drosophila simulans and measured the amount of nucleotide sequence divergence between D. simulans and its sibling species D. melanogaster. The levels of silent nucleotide polymorphism and divergence in the Mtn region were compared with those in the Adh region, using the neutrality test of R. R. Hudson, M. Kreitman and M. Aguade.

Lange, B. W.; Langley, C. H.; Stephan, W.

1990-01-01

17

Transcription factor MBF-I interacts with metal regulatory elements of higher eucaryotic metallothionein genes.  

PubMed Central

Metallothionein (MT) gene promoters in higher eucaryotes contain multiple metal regulatory elements (MREs) that are responsible for the metal induction of MT gene transcription. We identified and purified to near homogeneity a 74-kilodalton mouse nuclear protein that specifically binds to certain MRE sequences. This protein, MBF-I, was purified employing as an affinity reagent a trout MRE that is shown to be functional in mouse cells but which lacks the G+C-rich and SP1-like sequences found in many mammalian MT gene promoters. Using point-mutated MREs, we showed that there is a strong correlation between DNA binding in vitro and MT gene regulation in vivo, suggesting a direct role of MBF-I in MT gene transcription. We also showed that MBF-I can induce MT gene transcription in vitro in a mouse extract and that this stimulation requires zinc. Images

Imbert, J; Zafarullah, M; Culotta, V C; Gedamu, L; Hamer, D

1989-01-01

18

Expression of metallothionein mRNAs on mouse cerebellum microglia cells by thimerosal and its metabolites  

Microsoft Academic Search

Effects of thimerosal and its metabolites, ethyl mercury and thiosalicylate, on the expression of metallothionein (MT) mRNAs in mouse cerebellum microglia cell line, C8-B4 cells, were studied. The level of MT-1 mRNA significantly decreased at early hours and recovered time-dependently 24h after thimerosal was added to the C8-B4 cells. However, MT-2 and MT-3 mRNA expressions did not change from the

Takeshi Minami; Eriko Miyata; Yamato Sakamoto; Azusa Kohama; Hideo Yamazaki; Seiji Ichida

2009-01-01

19

Overexpressed Human Metallothionein IIA Gene Protects Chinese Hamster Ovary Cells from Killing by Alkylating Agents  

Microsoft Academic Search

Experiments were designed to detect survival advantages that cells gain by overexpressing metallothionein (MT). Chinese hamster ovary K1-2 cells and an x-ray-sensitive derivative were transfected with a bovine papillomavirus (BPV)-linked construct carrying the human metallothionein IIA (hMT-II_A gene. Transfectants survived 40-fold higher levels of cadmium chloride, harbored at least 30 copies of hMT-II_A, and contained 25- to 166-fold more MT

Bernd Kaina; Horst Lohrer; Michael Karin; Peter Herrlich

1990-01-01

20

Structure and Function of the Human Metallothionein Gene Family: Final Technical Report.  

National Technical Information Service (NTIS)

The full nucleotide sequence of two additional human metallothionein (hMT) genes has been determined. These genes, hMT-I/sub B/ and hMT-I/sub F/, are located within the MT-I gene cluster we have described originally. The hMT-I/sub F/ gene is the first hMT...

M. Karin

1986-01-01

21

A novel metallothionein gene from a mangrove plant Kandelia candel.  

PubMed

A new metallothionein (MT) gene was cloned from Kandelia candel, a mangrove plant with constitutional tolerance to heavy metals, by rapid amplification of cDNA ends and named KMT, which is composed of two exons and one intron. The full length of KMT cDNA was 728 bp including 121 bp 5' noncoding domain, 240 bp open reading frame and 384 bp 3' termination. The coding region of KMT represented a putative 79 amino acid protein with a molecular weight of 7.75 kDa. At each of the amino- and carboxy-terminal of the putative protein, cysteine residues were arranged in Cys-Cys, Cys-X-Cys and Cys-X-X-Cys, indicating that the putative protein was a novel type 2 MT. Sequence and homology analysis showed the KMT protein sequence shared more than 60 % homology with other plant type 2 MT-like protein genes. At amino acid level, the KMT was shown homology with the MT of Quercus suber (83 %), of Ricinus communis (81 %) and of Arabidopsis thaliana (64 %). Function studies using protease-deficient Escherichia coli strain BL21 Star ™(DE3) confirmed the functional nature of this KMT gene in sequestering both essential (Zn) and non-essential metals (Cd and Hg) and the E. coli BL21 with KMT can live in 1,000 ?mol/L Zn, 120 ?mol/L Hg, and 2,000 ?mol/L Cd. The information could provide more details of the causative molecular and biochemical mechanisms (including heavy metal sequestration) of the KMT in K. candel or a scientific basis for marine heavy-metal environment remediation with K. candel. This study also provides a great significance of protecting mangrove species and mangrove ecosystem. PMID:22711547

Zhang, Feng-Qin; Wang, You-Shao; Sun, Cui-Ci; Lou, Zhi-Ping; Dong, Jun-De

2012-06-19

22

Genes with similarity to metallothionein genes and copper, zinc ligands in Pisum sativum L  

Microsoft Academic Search

The PsMT gene family of pea (Pisum sativum L.) encodes predicted proteins with sequence similarity to metallothioneins. However, PsMT proteins have not yet been characterised in planta and their functions remain obscure. PsMT transcripts were identified in the cortex tissue of pea roots using tissue squash-blotting techniques. Transcripts were not detected on northern blots of RNA isolated from the embryonic

Nigel J. Robinson; I. Marta Evans; Janet Mulcrone; Julia Bryden; Andrew M. Tommey

1992-01-01

23

Characterization of DNA sequences through which cadmium and glucocorticoid hormones induce human metallothionein-IIA gene  

Microsoft Academic Search

Deletion experiments have defined two stretches of DNA (genetic elements), lying close to the promoter for a human gene for metallothionein, that separately mediate the induction of the gene by heavy metal ions, particularly cadmium, and by glucocorticoid hormones. The element responsible for induction by cadmium is duplicated, yet a single copy is fully functional; the element responsible for induction

Michael Karin; Alois Haslinger; Heidi Holtgreve; Robert I. Richards; Paul Krauter; Hannes M. Westphal; Miguel Beato

1984-01-01

24

A synthetic cadmium metallothionein gene (PMCd1syn) of Paramecium species: expression, purification and characteristics of metallothionein protein.  

PubMed

Metallothioneins (MTs) are metal binding proteins that are rich in cysteine residues constituting 10-30 % of the total protein, and in which the thiol groups bind to the metal ions. The increasing amount of metal ions in the medium have shown increased production of MTs by different organisms such as bacteria, protozoa and mammals like humans. PMCd1 is the first gene ever discovered in Paramecium, a ciliated protozoan, that could produce this MT in response to cadmium. In this study the PMCd1syn gene has been cloned in pET41a expression vector and expressed in an Escherichia coli BL21-codonplus strain for the first time. Since the gene PMCd1 amplified from Paramecium contained 10 codons, which could act as stop codons during expression in E. coli, this gene of 612 bps was synthesized to substitute these (stop) codons for the Paramecium sp. specific amino acids. For stability of the expressed protein, glutathione-S-transferase gene was fused with PMCd1syn gene and coexpressed. The cells expressing PMCd1syn demonstrated increased accumulation of cadmium. This is the first report of cadmium MT protein expressed from Paramecium species, particularly from synthetic MT gene (PMCd1syn). This fusion protein, the molecular weight of which has been confirmed to be 53.03 kDa with MALDI analysis, is rich in cysteine residues, and has been shown for the first time in this ciliate to bind to and sequester Cd(2+)-ions. PMID:23124222

Dar, Saira; Shuja, Rukhsana N; Shakoori, Abdul Rauf

2012-11-03

25

Glucose regulates free cytosolic Zn²? concentration, Slc39 (ZiP), and metallothionein gene expression in primary pancreatic islet ?-cells.  

PubMed

Zn²? is an important cofactor for insulin biosynthesis and storage in pancreatic ?-cells. Correspondingly, polymorphisms in the SLC30A8 gene, encoding the secretory granule Zn²? transporter ZnT8, are associated with type 2 diabetes risk. Using a genetically engineered (FRET)-based sensor (eCALWY-4), we show here that elevated glucose time-dependently increases free cytosolic Zn²? ([Zn²?](cyt)) in mouse pancreatic ?-cells. These changes become highly significant (853 ± 96 pm versus 452 ± 42 pm, p < 0.001) after 24 h and are associated with increased expression of the Zn²? importer family members Slc39a6, Slc39a7, and Slc39a8, and decreased expression of metallothionein 1 and 2. Arguing that altered expression of the above genes is not due to altered [Zn²?](cyt), elevation of extracellular (and intracellular) [Zn²?] failed to mimic the effects of high glucose. By contrast, increases in intracellular cAMP prompted by 3-isobutyl-1-methylxanthine and forskolin partially mimicked the effects of glucose on metallothionein, although not ZiP, gene expression. Modulation of intracellular Ca²? and insulin secretion with pharmacological agents (tolbutamide and diazoxide) suggested a possible role for changes in these parameters in the regulation of Slc39a6 and Slc39a7 but not Slc39a8, nor metallothionein expression. In summary, 1) glucose induces increases in [Zn²?](cyt), which are then likely to facilitate the processing and/or the storage of insulin and its cocrystallization with Zn²?, and 2) these increases are associated with elevated expression of zinc importers. Conversely, a chronic increase in [Zn²?](cyt) following sustained hyperglycemia may contribute to ?-cell dysfunction and death in some forms of diabetes. PMID:21613223

Bellomo, Elisa A; Meur, Gargi; Rutter, Guy A

2011-05-25

26

Stress to cadmium monitored by metallothionein gene induction in Paracentrotus lividus embryos  

Microsoft Academic Search

We used sea urchin embryos as bioindicators to study the effects of exposure to sublethal cadmium con- centrations on the expression of the metallothionein (MT) gene stress marker. For this purpose, the complete comple- mentary deoxyribonucleic acid of the species Paracentrotus lividus (Pl) was cloned and sequenced. Northern blot analysis showed that basal levels of Pl-MT messenger ribonucleic acid, having

Roberta Russo; Rosa Bonaventura; Francesca Zito; Heinz-C. Schröder; Isabel Müller; Werner E. G. Müller; Valeria Matranga

2003-01-01

27

Quantitative PCR analysis of two molluscan metallothionein genes unveils differential expression and regulation  

Microsoft Academic Search

The mRNA levels of two components of the mussel (Mytilus galloprovincialis) metallothionein (MT) gene families, MT10 and MT20, were evaluated using real-time quantitative-PCR and Sybr Green I chemistry in animals exposed to heavy metals in vivo and in primary cell cultures. This method was highly specific in detecting the expression of the two genes over a widely dynamic range of

Francesco Dondero; Luciana Piacentini; Mohamed Banni; Mauro Rebelo; Bruno Burlando; Aldo Viarengo

2005-01-01

28

Induction by mercury compounds of metallothioneins in mouse tissues: inorganic mercury accumulation is not a dominant factor for metallothionein induction in the liver.  

PubMed

Among the naturally occurring three mercury species, metallic mercury (Hg(0)), inorganic mercury (Hg(II)) and methylmercury (MeHg), Hg(II) is well documented to induce metallothionein (MT) in tissues of injected animals. Although Hg(0) and MeHg are considered to be inert in terms of directly inducing MT, MT can be induced by them after in vivo conversion to Hg(II) in an animal body. In the present study we examined accumulations of inorganic mercury and MT inductions in mouse tissues (brain, liver and kidney) up to 72 hr after treatment by one of three mercury compounds of sub-lethal doses. Exposure to mercury compounds caused significant mercury accumulations in mouse tissues examined, except for the Hg(II)-treated mouse brain. Although MeHg caused the highest total mercury accumulation in all tissues among mercury compounds, the rates of inorganic mercury were less than 10% through the experimental period. MT inductions that depended on the inorganic mercury accumulation were observed in kidney and brain. However, MT induction in the liver could not be accounted for by the inorganic mercury accumulation, but by plasma IL6 levels, marked elevation of which was observed in Hg(II) or MeHg-treated mouse. The present study demonstrated that MT was induced in mouse tissues after each of three mercury compounds, Hg(0), Hg(II) and MeHg, but the induction processes were different among tissues. The induction would occur directly through accumulation of inorganic mercury in brain and kidney, whereas the hepatic MT might be induced secondarily through mercury-induced elevation in the plasma cytokines, rather than through mercury accumulation in the tissue. PMID:21628964

Yasutake, Akira; Nakamura, Masaaki

2011-06-01

29

Functional Characterisation of the Oil Palm Type 3 Metallothionein-like Gene ( MT3B ) Promoter  

Microsoft Academic Search

In silico analysis showed that the differentially expressed type 3 oil palm metallothionein-like genes MT3-A and MT3-B share at least 11 common putative promoter regulatory elements. The identified motifs include W-boxes, TATCCA element, binding\\u000a element for cytokinin response regulators and pollen-specific elements. A high degree of conservation was observed in their\\u000a genomic organisation where the coding regions are divided at

Zubaidah Ramli; Siti Nor Akmar Abdullah

2010-01-01

30

The isolation and characterisation of type II metallothionein-like genes from tomato (Lycopersicon esculentum L.)  

Microsoft Academic Search

Two cDNAs encoding putative metallothionein (MT)-like peptides have been isolated from tomato (L. esculentum L.). The predicted protein products of these two cDNAs (LeMTA and LeMTB) are 72 and 83 amino acids respectively and both encode peptides with arrangements of cysteine residues characteristic of type II plant MTs. In other plants which possess more than one gene expressing MT proteins

C. A. Whitelaw; J. A. Le Huquet; D. A. Thurman; A. B. Tomsett

1997-01-01

31

Mercury accumulation and its distribution to metallothionein in mouse brain after sub-chronic pulse exposure to mercury vapor.  

PubMed

Previously we found that exposure to mercury vapor effectively induced metallothionein (MT) biosynthesis in rat brain. Although the induction of not only MT-I/II but also MT-III was evident, the induction rate of the latter was much lower than that of the former. The brain of an MT-null mouse lacks MT-I/II, but has MT-III. Here we examined the effects of sub-chronic pulse exposure to mercury vapor on the brain MT in MT-null mice and their wild type controls. MT-null and wild type mice were preliminarily exposed to mercury vapor for 2 weeks at 0.1 mg Hg/m(3) for 1 h/day for 3 days a week, and then exposed for 11 weeks at 4.1 mg Hg/m(3) for 30 min/day for 3 days a week. This exposure caused no toxic signs such as abnormal behavior or loss of body weight gain in the mice of either strain throughout the experimental period. Twenty-four hours after the termination of the exposure, mice were sacrificed and brain samples were subjected to mercury analysis, MT assay, and pathological examination. The MT-null mice showed lower accumulation of mercury in the brain than the wild type mice. Mercury exposure resulted in a 70% increase of brain MT in the wild type mice, which was mostly accounted for by the increase in MT-I/II. On the other hand, the brain MT in the MT-null mice increased by 19%, suggesting less reactivity of the MT-III gene to mercury vapor. Although histochemical examination revealed silver-mercury grains in the cytoplasm of nerve cells and glial cells throughout the brains of both strains, no significant difference was observed between the two strains. PMID:15138662

Yasutake, A; Sawada, M; Shimada, A; Satoh, M; Tohyama, C

2004-05-12

32

Expression of metallothionein and Nrf2 pathway genes in lung cancer and cancer-surrounding tissues  

PubMed Central

Background Nuclear factor (erythroid-derived 2)-like (Nrf)2 and metallothionein have been implicated in carcinogenesis. This study investigated the expression of Nrf2 and of Nrf2-targeted genes (NQO1 and GCLC) and the genes for the metallothionein (MT) isoforms (MT-1A and MT-2A) in human lung cancer and cancer-surrounding tissues. Methods Surgically removed lung cancer samples (n?=?80) and cancer-surrounding tissues (n?=?38) were collected from Zunyi Medical College Hospital, China. Total RNA was extracted, purified, and used for real-time reverse transcription-PCR analysis of interested genes. Results Expression of the Nrf2-targed genes NQO1 and GCLC tended to be higher (30 to 60%) in lung cancers, but was not significantly different from that in peri-cancer tissues. By contrast, expression of the genes for M)-1A, MT-2A, and the metal transcription factor MTF-1 were three-fold to four-fold lower in lung cancers. Conclusion In surgical samples of lung cancer, MT expression was generally downregulated, whereas Nrf2 expression tended to be upregulated. These changes could play an integral role in lung carcinogenesis.

2013-01-01

33

Variation in metallothionein gene expression is associated with adaptation to copper in the earthworm Dendrobaena octaedra.  

PubMed

Evolution of resistance to heavy metals has been reported for several populations of soil living organisms occurring at metal contaminated sites. Such genetically based and heritable resistance contribute to the persistence of populations in contaminated areas. Here we report on molecular responses to experimental copper in populations of the earthworm, Dendrobaena octaedra, originating from copper contaminated soil near Gusum (Sweden) where heavy metal pollution has been present for several decades. We studied gene expression of six genes potentially involved in resistance to copper toxicity using F2-generations of D. octaedra populations, originating from reference sites and contaminated (High, Medium and Low) sites around Gusum. The main result was different expression patterns of genes encoding for two different isoforms (mt1 and mt2) of metallothionein proteins during experimental exposure to copper contaminated soil. Expression of mt1 showed a fast and significant upregulation in the High population and a slower, albeit significant, upregulation in Medium and Low populations. However, in the three reference populations no upregulation were seen. In comparison, a fast upregulation was also seen for the High population in the isoform mt2, whereas, gene expression of all other populations, including reference populations, showed slower upregulation in response to experimental copper. The results indicate that copper resistance in D. octaedra from contaminated areas is related to an increased expression of metallothioneins. PMID:23237849

Fisker, Karina Vincents; Holmstrup, Martin; Sørensen, Jesper Givskov

2012-12-11

34

A DNA segment controlling metal-regulated expression of the Drosophila melanogaster metallothionein gene Mtn.  

PubMed Central

Cloned fragments of DNA including the Drosophila melanogaster metallothionein gene Mtn and different amounts of 5' flanking sequences were introduced into flies by P-element-mediated germ line transformation. Comparison of RNA levels in different transformants revealed that metal-regulated and tissue-specific expression of Mtn requires no more than 373 base pairs upstream of the initiation site of transcription. Transformants having an additional, transcribed copy of Mtn could tolerate increased concentrations of cadmium, indicating that Mtn expression is directly related to this phenotype. In separate experiments, these D. melanogaster promoter sequences were fused to the coding sequences of the herpes simplex virus thymidine kinase (TK) gene. After transfection of this fusion into baby hamster kidney cells, increases in TK activity and accumulation of TK RNA were inducible by metals. A series of 5' and 3' deletions showed that D. melanogaster sequences from -130 to -6 were sufficient to confer metal-regulated expression to the TK gene. The function of the D. melanogaster metallothionein promoter in mammalian cells indicates that the mechanism controlling metal regulation is evolutionarily conserved. Images

Otto, E; Allen, J M; Young, J E; Palmiter, R D; Maroni, G

1987-01-01

35

Changes in copper and zinc status and response to dietary copper deficiency in metallothionein-overexpressing transgenic mouse heart  

PubMed Central

Previous studies have shown that cardiac-specific overexpression of metallothionein (MT) inhibits progression of dietary copper restriction-induced cardiac hypertrophy. Because copper and zinc are critically involved in myocardial response to dietary copper restriction, the present study was undertaken to understand the effect of MT on the status of copper and zinc in the heart and the subsequent response to dietary copper restriction. Dams of cardiac-specific MT-transgenic (MT-TG) mouse pups and wild-type (WT) littermates were fed copper-adequate or copper-deficient diet starting on the fourth day post delivery and the weanling mice were continued on the same diet until they were sacrificed. Zinc and copper concentrations were significantly elevated in MT-TG mouse heart, but the extent of zinc elevation was much more than copper. Dietary copper restriction significantly decreased copper concentrations to the same extent in both MT-TG and WT mouse hearts, and decreased zinc concentrations along with a decrease in MT concentrations in the MT-TG mouse heart. Copper deficiency-induced heart hypertrophy was significantly inhibited, but copper deficiency-induced suppression of serum ceruloplasmin or hepatic Cu,Zn-SOD activities were not inhibited in the MT-TG mice. These results suggest that elevation in zinc but not copper in the heart may be involved in the MT inhibition of copper deficiency-induced cardiac hypertrophy.

Kang, Y. James; Jiang, Youchun; Saari, Jack T.

2008-01-01

36

Tandemly duplicated upstream control sequences mediate copper-induced transcription of the Saccharomyces cerevisiae copper-metallothionein gene.  

PubMed Central

Transcription of the Saccharomyces cerevisiae copper-metallothionein gene, CUP1, inducible by copper. By analyzing deletion and fusion mutants in the CUP1 5'-flanking region, we identified two closely related, tandemly arranged copper regulatory elements. A synthetic version of one of these elements conferred efficient copper induction on a heterologous promoter when present in two tandem copies. Images

Thiele, D J; Hamer, D H

1986-01-01

37

Metallothioneins in antarctic fish: evidence for independent duplication and gene conversion.  

PubMed

In the present paper, we examine eight species of Antarctic fish belonging to the suborder Notothenioidei, using reverse-transcriptase polymerase chain reaction, to investigate the presence of mRNAs encoding metallothionein (MT) isoforms. A total of 168 bp from the coding region and the complete (133-165 bp) 3' untranslated region (UTR) was obtained for all species (for three of them, we also sequenced the full-length cDNA, including the 5' UTR). Phylogenetic analyses carried out on the MT-coding region suggest monophyly for Antarctic fish MTs with respect to other teleost MT genes. Analyses also revealed that notothenioid MTs can be divided into at least two groups of paralogy, MT-1 and MT-2. These results indicate that notothenioid MT isoforms arose from at least one gene duplication event occurring in the ancestral lineage of the Notothenioidei. This duplication occurred independent of the one which gave origin to two metallothionein isoforms in the rainbow trout. In addition, an instance of gene conversion was observed between MT-1 and MT-2 genes in Notothenia coriiceps. Analyses of the 5' UTR, combined with quantitative assay of differential expression of MT-1 and MT-2, indicate that only the 3' UTR underwent a gene conversion event in the mentioned species. These findings, together with the observation of a differential pattern of expression for the two MT isoforms, disclose an unexpected complexity in the evolution and function of notothenioid MTs; as in most teleost species examined (apart from the rainbow trout), a single MT form is present. PMID:10406107

Bargelloni, L; Scudiero, R; Parisi, E; Carginale, V; Capasso, C; Patarnello, T

1999-07-01

38

Overexpressed human metallothionein IIA gene protects Chinese hamster ovary cells from killing by alkylating agents  

SciTech Connect

Experiments were designed to detect survival advantages that cells gain by overexpressing metallothionein (MT). Chinese hamster ovary K1-2 cells and an x-ray-sensitive derivative were transfected with a bovine papillomavirus (BPV)-linked construct carrying the human metallothionein IIA (hMT-IIA) gene. Transfectants survived 40-fold higher levels of cadmium chloride, harbored at least 30 copies of hMT-IIA, and contained 25- to 166-fold more MT than the parent cells. Even under conditions of reduced glutathione synthesis, the transfectants were not more resistant to the lethal effects of ionizing radiation and bleomycin than the parent cells. Thus free radicals generated by these agents cannot be scavenged efficiently by MT in vivo. The hMT-IIA transfectants, however, but not control transfectants harboring a BPV-MT promoter-neo construct, tolerated significantly higher doses of the alkylating agents N-methyl-N-nitrosourea and N-methyl-N'-nitro-N-nitrosoguanidine. Resistance and MT overexpression occurred irrespective of selection and cultivation in cadmium and zinc. There was no increase in resistance to methyl methanesulfonate and N-hydroxyethyl-N-chloroethylnitrosourea. MT did not affect the degree of overall DNA methylation after N-methyl-N-nitrosourea treatment nor the level of O6-methylguanine-DNA methyltransferase. The results suggest that MT participates as a cofactor or regulatory element in repair or tolerance of toxic alkylation lesions.

Kaina, B.; Lohrer, H.; Karin, M.; Herrlich, P. (Kernforschungszentrum Karlsruhe, Karlsruhe (Germany, F.R.))

1990-04-01

39

Structure and tissue-specific expression of the human metallothionein IB gene.  

PubMed Central

The human metallothionein (MT) IB gene (hMT-IB) is located in a region of human DNA containing at least four tandemly arranged MT genes. As deduced from its sequence, hMT-IB is likely to encode a functional protein. However, the predicted amino acid sequence differed from the hMT-I amino acid sequence in four positions. Most remarkable was the presence of an additional cysteine. Like other MT genes, hMT-IB has at least two copies of the metal-responsive element upstream from the transcription initiation site. These elements probably are responsible for the metal responsiveness of the hMT-IB promoter, leading to inducible expression of fused heterologous genes. Unlike the hMT-IIA and hMT-IA genes described previously, which are expressed in many different cell types, a high level of expression of the endogenous hMT-IB gene could be detected only in human hepatoma and renal carcinoma cell lines. Therefore, this is the first MT gene described which exhibits tissue specificity of expression. This specificity is controlled by a cis-acting mechanism involving methylation, since incubation of nonexpressing cells with an inhibitor of DNA methylation led to activation of the hMT-IB gene. In support of this notion, we found that the 5' flanking region of the hMT-IB gene was highly methylated in HeLa cells, a nonexpressing cell type, but it was not methylated in a hepatoma (expressing) cell line. Images

Heguy, A; West, A; Richards, R I; Karin, M

1986-01-01

40

Cloning of a metallothionein gene and characterization of two other cDNA sequences in the Pacific oyster Crassostrea gigas (CgMT1)  

Microsoft Academic Search

Metallothionein (MT) genes encode essential metal-binding proteins involved in metallic homeostasis and detoxification in living organisms. Here, we describe the structure of the first Pacific oyster Crassostrea gigas metallothionein (CgMT1) gene and the sequences of two other MT cDNA. The CgMT1 gene sequence contains three coding exons plus a 5? entirely non-coding exon, and the predicted protein contains 21 cysteine

Arnaud Tanguy; Catherine Mura; Dario Moraga

2001-01-01

41

Tetrahymena Metallothioneins Fall into Two Discrete Subfamilies  

Microsoft Academic Search

BackgroundMetallothioneins are ubiquitous small, cysteine-rich, multifunctional proteins which can bind heavy metals.Methodology\\/Principal FindingsWe report the results of phylogenetic and gene expression analyses that include two new Tetrahymena thermophila metallothionein genes (MTT3 and MTT5). Sequence alignments of all known Tetrahymena metallothioneins have allowed us to rationalize the structure of these proteins. We now formally subdivide the known metallothioneins from the ciliate

Silvia Díaz; Francisco Amaro; Daniel Rico; Virginia Campos; Laura Benítez; Ana Martín-González; Eileen P. Hamilton; Eduardo Orias; Juan C. Gutiérrez; Jürg Bähler

2007-01-01

42

Structure and origin of a tandem duplication of a Drosophila metallothionein gene  

SciTech Connect

A strain of cadmium-resistant Drosophila was isolated that contained a chromosomal duplication of the metallothionein gene, Mtn. This duplication was a direct, tandem repeat of 2.2 kilobases of DNA: 228 bases of 5' flanking DNA, the entire transcription unit, and 1.4 kilobases of 3' flanking DNA. The entire duplication was cloned and DNA sequences of the regions relevant to the duplication process were determined. Comparison of the sequences of the 5' and 3' boundaries revealed no extensive regions of similarity, thus indicating that this duplication was formed by nonhomologous breakage and reunion. Recently, results of similar analyses by other investigators have suggested that this process was involved in the origin of three other eukaryotic duplications. The authors have observed a chi-like sequence near one of the boundaries of each duplication, and therefore suggest that this sequence may be important in generating one of the breaks required for duplication formation.

Otto, E.; Maroni, G.

1987-01-01

43

Gene response profiles for Daphnia pulex exposed to the environmental stressor cadmium reveals novel crustacean metallothioneins  

PubMed Central

Background Genomic research tools such as microarrays are proving to be important resources to study the complex regulation of genes that respond to environmental perturbations. A first generation cDNA microarray was developed for the environmental indicator species Daphnia pulex, to identify genes whose regulation is modulated following exposure to the metal stressor cadmium. Our experiments revealed interesting changes in gene transcription that suggest their biological roles and their potentially toxicological features in responding to this important environmental contaminant. Results Our microarray identified genes reported in the literature to be regulated in response to cadmium exposure, suggested functional attributes for genes that share no sequence similarity to proteins in the public databases, and pointed to genes that are likely members of expanded gene families in the Daphnia genome. Genes identified on the microarray also were associated with cadmium induced phenotypes and population-level outcomes that we experimentally determined. A subset of genes regulated in response to cadmium exposure was independently validated using quantitative-realtime (Q-RT)-PCR. These microarray studies led to the discovery of three genes coding for the metal detoxication protein metallothionein (MT). The gene structures and predicted translated sequences of D. pulex MTs clearly place them in this gene family. Yet, they share little homology with previously characterized MTs. Conclusion The genomic information obtained from this study represents an important first step in characterizing microarray patterns that may be diagnostic to specific environmental contaminants and give insights into their toxicological mechanisms, while also providing a practical tool for evolutionary, ecological, and toxicological functional gene discovery studies. Advances in Daphnia genomics will enable the further development of this species as a model organism for the environmental sciences.

Shaw, Joseph R; Colbourne, John K; Davey, Jennifer C; Glaholt, Stephen P; Hampton, Thomas H; Chen, Celia Y; Folt, Carol L; Hamilton, Joshua W

2007-01-01

44

[Cloning and expression of a novel metallothionein gene LbMT2 from Limonium bicolor].  

PubMed

The full length cDNA of a novel metallothionein (LbMT2) gene was cloned from a cDNA library of Limonium bicolor. The LbMT2 gene cloned is 518 bp in length, which includes a 64 bp of 5' untranslated region (UTR) and a 205 bp of 3' untranslated region. This gene has an open reading frame (ORF) of 249 bp in length, encoding a protein of 82 amino acid residues with the molecular mass of 8.1 kDa and theoretical pI of 4.71. The expression of LbMT2 gene in L. bicolor in response to CuSO4, CdCl2, NaCl, cold, and PEG was further investigated using real time quantitative PCR. In both leaf and root of L. bicolor, the expression of LbMT2 was induced by CuSO4, CdCl2, NaCl, and cold, but inhibited by PEG stress. LbMT2 gene was inserted into a prokaryotic expression vector (pGEX-4T-2) to produce the recombinant expression vector pGEX-LbMT2. The expression of LbMT2 in E. coli BL21 was induced with IPTG, which produced a protein band with expected size of 35 kDa on SDS-PAGE. PMID:18779161

Ban, Qiao-Ying; Liu, Gui-Feng; Wang, Yu-Cheng; Zhang, Da-Wei; Jiang, Li-Li

2008-08-01

45

Quantitative PCR analysis of two molluscan metallothionein genes unveils differential expression and regulation.  

PubMed

The mRNA levels of two components of the mussel (Mytilus galloprovincialis) metallothionein (MT) gene families, MT10 and MT20, were evaluated using real-time quantitative-PCR and Sybr Green I chemistry in animals exposed to heavy metals in vivo and in primary cell cultures. This method was highly specific in detecting the expression of the two genes over a widely dynamic range of starting DNA amounts, showing that the basal level of MT expression is mostly due to MT10 mRNA. Basal MT expression reflected the intracellular concentration of heavy metal as indicated by the use of the heavy metal chelator TPEN on primary cells. MT10 was observed to be inducible by Cd, Zn, and Cu ions, and to a lesser extent by Hg. By contrast, the MT20 expression level was very low under basal conditions, while its mRNA increased dramatically in response to Cd exposure, and to a lesser extend to Hg, leading to levels of expression similar to those of the MT10 gene. The essential metals Cu and Zn had a very small effect on the MT20 gene, whereas the concomitant exposure to Cu and H(2)O(2) produced a rapid rise of expression. In summary, data indicate that the MT isogenes are differentially regulated by heavy metals, while hydroxyl radicals may have a role in MT20 gene activation. Also, protein expression showed metal inducibility only after Cd exposure, suggesting the occurrence of posttranscriptional control mechanisms. PMID:15716106

Dondero, Francesco; Piacentini, Luciana; Banni, Mohamed; Rebelo, Mauro; Burlando, Bruno; Viarengo, Aldo

2005-01-06

46

Coordinate amplification of metallothionein I and II gene sequences in cadmium-resistant CHO variants  

SciTech Connect

Cadmium-resistanc (Cd/sup r/) variants of the Chinese hamster cell line, CHO, have been derived by stepwise selection for growth in medium containing CdCl/sub 2/. These variants show coordinately increased production of both metallothionein (MT) I and II and were stably resistant to Cd/sup 2 +/ in the absence of continued selection. Genomic DNAs from these Cd/sup r/ sublines were analyzed for both MT gene copy number and MT gene organization, using cDNA sequence probes specific for each of the two Chinese hamster isometallothioneins. These analyses revealed coordinate amplification of MT I and II genes in all Cd/sup r/ variants which had increased copies of MT-encoding sequences. In situ hybridization of an MT-encoding probe to mitotic chromosomes of a Cd/sup r/ variant, which has amplified MT genes at least 14-fold, revealed a single chromosomal site of hybridization. These results suggest that the isoMTs constitute a functionally related gene cluster which amplifies coordinately in response to toxic metal stress.

Hildebrand, C.E.; Crawford, B.D.; Enger, M.D.

1983-01-01

47

Human and mouse gene nomenclature.  

PubMed

Standard genetic nomenclature is necessary to help researchers, clinicians, and the public to access data on their genes of interest, and to communicate in a globally understood language of approved gene symbols. In both human and mouse, one unique symbol (acronym/abbreviation) and one name are assigned for each gene. Co-ordination between human and mouse gene nomenclature is a successful endeavor, due in part to the historical interaction between the two nomenclature committee groups. This interaction grew out of the Human Gene Mapping (HGM) Workshops. This appendix discusses development and organization of gene nomenclature, how to find a gene and how to name a new gene. PMID:18428336

Wain, Hester; Povey, Sue; Maltais, Lois

2003-02-01

48

The metallothionein genes of Mytilus galloprovincialis: genomic organization, tissue expression and evolution.  

PubMed

Recently, increasing interest has been directed to the study of metallothioneins (MTs), which are small proteins that are able to bind metal ions. The induction of MT synthesis after exposure to metal or other environmental contaminants in a large number of aquatic invertebrates makes these proteins good biomarkers in water monitoring programs. Within bivalves, the species Mytilus galloprovincialis and Mytilus edulis represent model organisms for these types of studies, as well as for molecular studies regarding the expression and characterization of MT encoding genes. In the present paper, we focused on the genomic characterization, evolutionary, and tissue-expression analyses of the MT-10, MT-10 Intronless, and MT-20 genes in M. galloprovincialis. The comparison of the genomic sequences showed the presence of long nucleotide stretches within the introns of the MT genes that are conserved between M. galloprovincialis and M. edulis. These non-coding conserved sequences may contain regulatory motifs. Real-Time RT-PCR experiments revealed that, at the basal conditions, the MT-10 and MT-10 Intronless genes are expressed at levels considerably higher than the MT-20 gene, mainly in the digestive gland and gill tissue. The strong induction of the MT-20 gene expression detected in a field-collected sample is associated with the up-regulation of both the MT-10 and MT-10 Intronless genes. Evolutionary analysis revealed signals of localized positive selection that, together with the tissue-expression data, support a possible functional diversification between the MTs encoded by the MT-10 and MT-10 Intronless genes. PMID:21429466

Aceto, Serena; Formisano, Giulia; Carella, Francesca; De Vico, Gionata; Gaudio, Luciano

2011-01-22

49

The Association of Metallothionein4 Gene Polymorphism and Renal Function in Long-Term Lead-Exposed Workers  

Microsoft Academic Search

The goal of this study is to investigate if metallothionein (MT) gene polymorphism affects the susceptibility to lead as well\\u000a as renal function parameters and blood pressures (BP) in workers exposed to lead for extended period of time. By means of\\u000a real-time polymerase chain reaction, the MT4-216 A\\/G genotypes classified as rs396230 in the single nucleotide polymorphism\\u000a database of the

Hsin-I Chen; Yu-Wen Chiu; Yu Kuei Hsu; Wan-Fen Li; Yi-Chun Chen; Hung-Yi Chuang

2010-01-01

50

The rainbow trout metallothionein-B gene promoter: contributions of distal promoter elements to metal and oxidant regulation  

Microsoft Academic Search

In this report, the contributions of the distal 5?-regulatory sequences of the rainbow trout (Oncorhynchus mykiss) metallothionein (tMT)-B gene promoter (?738 to +5) were studied. Transfection of the ?738 promoter fragment in a rainbow trout hepatoma cell line (RTH-149) resulted in 4- to 5-fold greater activity compared to the proximal ?137 promoter region. Mutation of the proximal MREa abolishes the

Susan L.-A. Samson; Wendy J. Paramchuk; Lashitew Gedamu

2001-01-01

51

Molecular control of copper homeostasis in filamentous fungi: increased expression of a metallothionein gene during aging of Podospora anserina.  

PubMed

The lifespan of the ascomycete Podospora anserina was previously demonstrated to be significantly increased in a copper-uptake mutant, suggesting that copper is a potential stressor involved in degenerative processes. In order to determine whether changes in copper stress occur in the cells during normal aging of cultures, we cloned and characterized a gene coding for a component of the molecular machinery involved in the control of copper homeostasis. This gene, PaMt1, is a single-copy gene that encodes a metallothionein of 26 amino acids. The coding sequence of PaMt1 is interrupted by a single intron. The deduced amino acid sequence shows a high degree of sequence identity to metallothioneins of the filamentous ascomycete Neurospora crassa and the basidiomycete Agaricus bisporus, and to the N-terminal portion of mammalian metallothioneins. Levels of PaMt1 transcript increase in response to elevated amounts of copper in the growth medium and during aging of wild-type cultures. In contrast, in the long-lived mutant grisea, transcript levels first increase but then decrease again. The ability of wild-type cultures to respond to exogenous copper stress via the induction of PaMt1 transcription is not affected as they grow older. PMID:11212915

Averbeck, N B; Borghouts, C; Hamann, A; Specke, V; Osiewacz, H D

2001-01-01

52

Metallothionein modulates lipopolysaccharide-stimulated tumour necrosis factor expression in mouse peritoneal macrophages.  

PubMed Central

Metallothionein (MT) is a low-molecular-mass, cysteine-rich metal binding protein thought to be involved in the detoxification of heavy metals and scavenging of free radicals. MT is directly induced not only by heavy metals, but also by hormones and cytokines. The present study, which uses mice with genetic deletions of the MT proteins (MT(-/-) mice), was designed to evaluate the effects of MT on the expression of pro-inflammatory cytokines in macrophages. We found that the production of tumour necrosis factor (TNF) induced by lipopolysaccharide (LPS) in peritoneal macrophages is up-regulated by MT via the modulation of nuclear factor kappaB (NF-kappaB) activity. This conclusion is supported by the following observations: (1) LPS stimulated the secretion of less TNF activity from MT(-/-) peritoneal exudate macrophages (PEMs) than from wild-type controls (MT(+/+) mice) without a difference in the pattern of kinetics; (2) LPS-stimulated expression of TNF-alpha mRNA was decreased in MT(-/-) PEMs; (3) LPS-stimulated activation of NF-kappaB was decreased in MT(-/-) PEMs; and (4) production of TNF in PEMs of MT(-/-) mice after LPS treatment in vivo was decreased (compared with MT(+/+) PEMs). Expression of other inflammatory cytokines, interleukin (IL)-1alpha and IL-6 mRNA, which were modulated by NF-kappaB, were also down-regulated in MT(-/-) PEMs. Thus MT plays a key role in the LPS-induced activation of PEMs via the modulation of NF-kappaB activity.

Kanekiyo, Masako; Itoh, Norio; Kawasaki, Atsuko; Matsuyama, Akiko; Matsuda, Kimihiro; Nakanishi, Tsuyoshi; Tanaka, Keiichi

2002-01-01

53

The mouse aquaporin-1 gene  

SciTech Connect

Members of the aquaporin family of molecular water transporters are expressed in diverse epithelia and in complex developmental patterns. Using a cDNA for mouse Aqp1, the structural gene was isolated and a restriction map was constructed. The 13-kb Aqp1 gene contains four exons with intronic boundaries corresponding to other known aquaporin genes. Transcription begins 67 bp 5{prime} to the translation initiation site and 20 bp 3{prime} from a TATAA consensus sequence. Aqp1 was localized by interspecific mouse backcross mapping to the central region of mouse chromosome 6 syntenic with human chromosome 7p14, where AQP1 had previously been localized. These studies have revealed marked structural similarities between the mouse Aqp1 and the human AQP1 genes, suggesting that further comparative studies may provide molecular insight into genetic regulatory features shared by both species. 21 refs., 3 figs.

Moon, C.; Preston, G.M.; Agre, P. [Johns Hopkins Univ. School of Medicine, Baltimore, MD (United States)] [and others

1995-11-20

54

Effect of intravenously injected zinc on tissue zinc and metallothionein gene expression of broilers.  

PubMed

1. The effect of intravenously injected zinc (Zn) on tissue Zn concentrations and pancreas metallothionein (MT) gene expression in broilers was investigated to detect differences in the tissue utilisation of Zn from different Zn sources. 2. A total of 432 male chickens were randomly allotted on d 22 post-hatch to one of nine treatments in a completely randomised design. Chickens were injected with either a 0.9% (w/v) NaCl solution (control) or a saline solution supplemented with Zn sulphate or one of three organic Zn chelates with weak (Zn-AA W), moderate (Zn-Pro M) or strong (Zn-Pro S) chelation strengths at two injected Zn dosages calculated according to two Zn absorbability levels (6 and 12%). 3. Bone and pancreas Zn concentrations, pancreas MT mRNA levels and MT concentrations increased on d 6 and 12 after Zn injections as the injected Zn dosages increased. Chickens injected with the Zn-Pro S had lower bone Zn concentration than those injected with the Zn-Pro M or Zn-AA W on d 6 after injections. However, no differences among Zn sources were observed in bone Zn concentration on d 12 after injections, pancreas Zn concentrations, pancreas MT mRNA levels and MT concentrations on both d 6 and d 12 after injections. 4. It was concluded that the injected Zn-Pro S was the least favourable for bone Zn utilisation of broilers. The pancreas Zn concentration and pancreas MT gene expressions might not be sensitive enough to detect differences in the tissue utilisation of injected Zn in broilers between organic and inorganic Zn sources or among organic Zn sources. PMID:23705842

Shen, S F; Wang, R L; Lu, L; Li, S F; Liu, S B; Xie, J J; Zhang, L Y; Wang, M L; Luo, X G

2013-05-24

55

Metallothionein-1 isoforms and vimentin are direct PU.1 downstream target genes in leukemia cells.  

PubMed

PU.1 is a key transcription factor for hematopoiesis and plays important roles in various hematological malignancies. To clarify the molecular function of PU.1, we initially tried to identify bona fide target genes regulated by PU.1. Dual microarrays were employed for this study to compare PU.1-knockdown K562 cells (K562PU.1KD) stably expressing PU.1 short inhibitory RNAs versus control cells and PU.1-overexpressing K562 cells (K562PU.1OE) versus control cells. In these analyses, we found that several genes, including metallothionein (MT)-1 isoforms (MT-1G and MT-1A) and vimentin (VIM), were markedly induced while Jun dimerization protein (JDP) 2 was suppressed in K562PU.1KD cells. Furthermore, the mRNA expressions of the MT-1 and VIM genes were inversely correlated and the mRNA expression of JDP2 was positively correlated with PU.1 mRNA expression in 43 primary acute myeloid leukemia specimens (MT-1G: R = -0.50, p < 0.001; MT-1A: R = -0.58, p < 0.0005; VIM: R = -0.39, p < 0.01; and JDP2: R = 0.30, p < 0.05). Next, we analyzed the regulation of the MT-1 and VIM genes. We observed increased associations of acetylated histones H3 and H4 with the promoters of these genes in K562PU.1KD cells. Sequence analyses of the regions approximately 1 kb upstream from the transcription start sites of these genes revealed numerous CpG sites, which are potential targets for DNA methylation. Chromatin immunoprecipitation assays revealed that methyl CpG-binding protein 2 (MeCP2) and PU.1 bound to the CpG-rich regions in the MT-1 and VIM promoters. Bisulfite sequencing analyses of the PU.1-bound regions of these promoters revealed that the proportions of methylated CpG sites were tightly related to the PU.1 expression levels. PMID:20139074

Imoto, Akemi; Okada, Mami; Okazaki, Toshio; Kitasato, Hidero; Harigae, Hideo; Takahashi, Shinichiro

2010-02-05

56

The metallothionein genes of Mytilus galloprovincialis: Genomic organization, tissue expression and evolution  

Microsoft Academic Search

Recently, increasing interest has been directed to the study of metallothioneins (MTs), which are small proteins that are able to bind metal ions. The induction of MT synthesis after exposure to metal or other environmental contaminants in a large number of aquatic invertebrates makes these proteins good biomarkers in water monitoring programs. Within bivalves, the species Mytilus galloprovincialis and Mytilus

Serena Aceto; Giulia Formisano; Francesca Carella; Gionata De Vico; Luciano Gaudio

2011-01-01

57

Molecular Evolution of the Metallothionein Gene Mtn in the Melanogaster Species Group: Results from Drosophila Ananassae  

PubMed Central

Three distinctly different alleles of the metallothionein gene Mtn have been identified in natural Drosophila melanogaster populations: Mtn(.3), Mtn(1), and Dp(Mtn(1)), where the latter designates a tandem duplication of Mtn(1). In Drosophila simulans, only Mtn(.3)-type alleles have been found. It has been suggested that Mtn(.3) is the ancestral allele and demonstrated that a presumed two-step transition from Mtn(.3) to Mtn(1) to Dp(Mtn(1)) is accompanied by an approximate 5-fold increase in RNA levels. We analyzed the evolutionary genetics of the Mtn locus of Drosophila ananassae, a distant relative of D. melanogaster and D. simulans within the melanogaster species group. The Mtn gene of D. ananassae is most similar to Mtn(.3). (i) it is identical with Mtn(.3) at the amino acid level, but differs from Mtn(1) in its terminal codon; (ii) its 3' UTR contains a characteristic extra DNA segment of about 50 bp which is present in Mtn(.3), but lacking in Mtn(1); (iii) duplications of Mtn were not found in a worldwide sample of 110 wild D. ananassae chromosomes. However, the intron of the Mtn gene in D. ananassae is only 69 bp long, whereas the length of the Mtn(.3) and Mtn(1) introns is 265 bp; and it lacks a polypyrimidine stretch upstream of the 3' splice site in contrast to the much greater pyrimidine-richness found in the Mtn(.3) and Mtn(1) introns. A short intron (67 bp) was also identified in a D. pseudoobscura Mtn allele, suggesting that the short intron is the ancestral form and that the transition from the short to the long intron occurred within the melanogaster species group. We discuss the significance of this observation with regard to the recently proposed classification of D. melanogaster introns into two groups: short introns (<90 bp) which tend to lack polypyrimidine stretches, and longer ones which have strong 3' splice signals similar to mammalian introns. A database search revealed that this length dimorphism is an evolutionarily conserved feature of Drosophila introns; transitions from one size class to the other appear to be rare between closely related species (e.g., within the melanogaster subgroup).

Stephan, W.; Rodriguez, V. S.; Zhou, B.; Parsch, J.

1994-01-01

58

Location-Specific Epigenetic Regulation of the Metallothionein 3 Gene in Esophageal Adenocarcinomas  

PubMed Central

Background Metallothionein 3 (MT3) maintains intracellular metal homeostasis and protects against reactive oxygen species (ROS)-induced DNA damage. In this study, we investigated the epigenetic alterations and gene expression of the MT3 gene in esophageal adenocarcinomas (EACs). Methods and Results Using quantitative bisulfite pyrosequencing, we detected unique DNA methylation profiles in the MT3 promoter region. The CpG nucleotides from ?372 to ?306 from the transcription start site (TSS) were highly methylated in tumor (n?=?64) and normal samples (n?=?51), whereas CpG nucleotides closest to the TSS (?4 and +3) remained unmethylated in all normal and most tumor samples. Conversely, CpG nucleotides in two regions (from ?139 to ?49 and +296 to +344) were significantly hypermethylated in EACs as compared to normal samples [FDR<0.001, ?log10(FDR)>3.0]. The DNA methylation levels from ?127 to ?8 CpG sites showed the strongest correlation with MT3 gene expression (r?=??0.4, P<0.0001). Moreover, the DNA hypermethylation from ?127 to ?8 CpG sites significantly correlated with advanced tumor stages and lymph node metastasis (P?=?0.005 and P?=?0.0313, respectively). The ChIP analysis demonstrated a more repressive histone modification (H3K9me2) and less active histone modifications (H3K4me2, H3K9ace) in OE33 cells than in FLO-1 cells; concordant with the presence of higher DNA methylation levels and silencing of MT3 expression in OE33 as compared to FLO-1 cells. Treatment of OE33 cells with 5-Aza-deoxycitidine restored MT3 expression with demethylation of its promoter region and reversal of the histone modifications towards active histone marks. Conclusion In summary, EACs are characterized by frequent epigenetic silencing of MT3. The choice of specific regions in the CpG island is a critical step in determining the functional role and prognostic value of DNA methylation in cancer cells.

Peng, DunFa; Hu, Tian-Ling; Jiang, Aixiang; Washington, Mary Kay; Moskaluk, Christopher A.; Schneider-Stock, Regine; El-Rifai, Wael

2011-01-01

59

Increased metallothionein gene expression in 5-aza-2'-deoxycytidine-induced resistance to cadmium cytotoxicity.  

PubMed

The pyrimidine analog, 5-azacytidine (AZA-CR), has been shown to increase the expression of the metallothionein (MT) gene and to induce tolerance to cadmium toxicity. Since incorporation into DNA of AZA-CR appears to be required for this effect, the deoxynucleoside of AZA-CR should also be effective. Therefore, this study was undertaken to assess the effect of 5-aza-2'-deoxycytidine (AZA-CdR) pretreatment on cadmium-induced cytotoxicity and MT expression in cultured cells. TRL 1215 cells in log phase of growth were exposed to AZA-CdR (0.4, 0.8, 4.0, 8.0 microM) followed 48 h later by the addition of cadmium (10 microM). MT concentrations were measured 24 h after the addition of cadmium. AZA-CdR alone caused modest, dose-related increases in MT levels (2.3-fold maximum), while cadmium alone resulted in a 9.5-fold increase. Pretreatment with AZA-CdR in combination with cadmium caused a 19--24-fold increase in cellular MT at all doses of AZA-CdR. Addition of the DNA synthesis inhibitor, hydroxyurea (HU), to the incubation medium during AZA-CdR exposure prevented the enhancing effect of the analog on cadmium induction of MT accumulation. Time course studies revealed that AZA-CdR pretreatment reduced the time required for cadmium to induce MT levels from 4--8 h to 0--2 h. AZA-CdR pretreated cells placed in suspension with cadmium (125 microM) showed a marked reduction in cadmium-induced cytotoxicity as reflected by reduced glutamic-oxaloacetic transaminase (GOT) loss. Uptake studies showed that AZA-CdR pretreatment had no effect on cadmium transport during the initial phases of exposure, indicating that an alteration in the toxicokinetics of the metal did not account for the reduction in toxicity. AZA-CdR did, however, cause hypomethylation of the MT-I gene. These results suggest that AZA-CdR pretreatment induces tolerance to cadmium toxicity by increasing the genetic expression of MT possibly through hypomethylation of the MT gene. PMID:2456160

Waalkes, M P; Miller, M S; Wilson, M J; Bare, R M; McDowell, A E

1988-01-01

60

Structure, organization, and regulation of human metallothionein IF gene: differential and cell-type-specific expression in response to heavy metals and glucocorticoids.  

PubMed Central

We describe a human genomic clone containing the metallothionein (MT) IF and MT IG genes. Southern blot analysis and partial DNA sequence determinations show that these genes are organized in a head-to-head fashion and are located approximately 7.0 kilobases apart from each other. Sequence analysis shows that the MT IF gene contains three exons separated by two introns. All of the intron-exon junctions are defined by the GT-AG rule. The 5' flanking region shows the presence of a duplicated metal regulatory element (TGCGC CCGGCCC) important in heavy-metal induction of this gene and a sequence for its basal level expression (GCGGGGCGGGTGCAAAG). The 5' flanking region is also highly G + C rich (approximately 75%) and contains several GC boxes (GGGCGG), probably important in the binding of transcription factors. The TATAA box and the AATAAA sequence are represented by their variants, the TATCAA box and the AATTAA sequence, respectively. This gene is functional and inducible by heavy metals but not by dexamethasone in mouse LMTK- cells after its transfer on a plasmid containing the herpes simplex virus thymidine kinase gene. Further studies on various human cell lines show that this gene is not expressed in a splenic lymphoblastoid cell line (WI-L2) but is expressed in two hepatoma cell lines (Hep 3B2 and Hep G2) in response to cadmium, zinc, and copper. Dexamethasone appears to have no significant effect on its expression. The studies suggest that the MT IF gene shows cell-type-specific expression and is differentially regulated by heavy metals and glucocorticoids. Images

Varshney, U; Jahroudi, N; Foster, R; Gedamu, L

1986-01-01

61

Cadmium induces alpha(1)collagen (I) and metallothionein II gene and alters the antioxidant system in rat hepatic stellate cells.  

PubMed

The mechanism of cadmium-mediated hepatotoxicity has been the subject of numerous investigations, principally in hepatocytes. Although, some uncertainties persist, sufficient evidence has emerged to provide a reasonable account of the toxic process in parenchymal cells. However, there is no information about the effect of cadmium in other hepatic cell types, such as stellate cells (fat storing cells, Ito cells, perisinusoidal cells, parasinusoidal cells, lipocytes). Hepatic stellate cells (HSC) express a quiescent phenotype in a healthy liver and acquire an activated phenotype in liver injury. These cells play an important role in the fibrogenic process. The objective of this study was to investigate the effect of a 24 h treatment of low Cd concentrations in glutathione content, lipid peroxidation damage, cytosolic free Ca, antioxidant enzyme activities: glutathione peroxidase, glutathione reductase, superoxide dismutase and catalase along with the capacity of this heavy metal to induce metallothionein II and alpha(1)collagen (I) in an hepatic stellate cell line (CFSC-2G). Cd-treated cells increased lipid peroxidation and the content of cytosolic free calcium, decreased glutathione content and superoxide dismutase, glutathione peroxidase and catalase activity. Cd was able to induce the expression of the metallothionein II and alpha(1)collagen (I) gene, that was not described in this cell type. Cadmium may act as a pro-fibrogenic agent in the liver probably by inducing oxidative damage by enhancing lipid peroxidation and altering the antioxidant system of the cells. Although, the exact role metallothionein induction plays in this process is unknown, it probably, provides a cytosolic pool of potential binding sites to sequester ionic Cd, thereby decreasing its toxicity. PMID:11750084

del Carmen, Escobar Ma; Souza, Verónica; Bucio, Leticia; Hernández, Elizabeth; Damián-Matsumura, Pablo; Zaga, Verónica; Gutiérrez-Ruiz, Ma Concepción

2002-01-15

62

Regulation of metallothionein gene expression by oxidative stress and metal ions  

Microsoft Academic Search

The metallothioneins (MT) are small, cysteine-rich heavy metal-binding proteins which participate in an array of protective stress responses. Although a single essential function of MT has not been demonstrated, MT of higher eukaryotes evolved as a mechanism to regulate zinc levels and distribution within cells and organisms. These proteins can also protect against some toxic metals and oxidative stress-inducing agents.

Glen K Andrews

2000-01-01

63

Metallothionein mediates leukocyte chemotaxis  

Microsoft Academic Search

BACKGROUND: Metallothionein (MT) is a cysteine-rich, metal-binding protein that can be induced by a variety of agents. Modulation of MT levels has also been shown to alter specific immune functions. We have noticed that the MT genes map close to the chemokines Ccl17 and Cx3cl1. Cysteine motifs that characterize these chemokines are also found in the MT sequence suggesting that

Xiuyun Yin; David A Knecht; Michael A Lynes

2005-01-01

64

Pharmacokinetic evaluation of technetium-99-metallothionein-conjugated mouse monoclonal antibody B72. 3 in rhesus monkeys  

Microsoft Academic Search

These studies were conducted to determine the biodistribution and pharmacokinetics of ({sup 99m}Tc)metallothionein-conjugated B72.3 ((Tc)MT-B72.3) in Rhesus monkeys (Macaca mulatta) that were performed as part of the preclinical evaluation of (Tc)MT-B72.3. The B72.3-MT conjugate was studied at three doses of B72.3 ranging from 0.03 mg\\/kg to 1 mg\\/kg to determine whether a relationship existed between the dose of total antibody

S. W. Burchiel; R. A. Hadjian; W. B. Hladik; C. A. Drozynski; G. L. Tolman; S. B. Haber; B. M. Gallagher

1989-01-01

65

Loss of metallothionein predisposes mice to diethylnitrosamine-induced hepatocarcinogenesis by activating NF?B target genes  

PubMed Central

Metallothioneins (MTs) are potent scavengers of free radicals that are silenced in primary hepatocellular carcinomas (HCCs) of human and rodent origin. To examine whether loss of MT promotes hepatocarcinogenesis, male Mt-1 and Mt-2 double knockout (MTKO) and wild type (WT) mice were exposed to diethylnitrosamine (DEN) and induction of HCC was monitored at 23 and 33 weeks. The size and number of liver tumors, liver to body weight ratio, and liver damage were markedly elevated in the MTKO mice at both time points compared to the WT mice. At 23 weeks MTKO mice developed HCC whereas WT mice developed only preneoplastic nodules suggesting that loss of MT accelerates hepatocarcinogenesis. MTKO tumors also exhibited higher superoxide anion levels. Although NF?B activity increased in the liver nuclear extracts of both genotypes after DEN exposure, the complex formed in MTKO mice was predominantly p50/65 heterodimer (transcriptional activator) as opposed to p50 homodimer (transcriptional repressor) in WT mice. Phosphorylation of p65 at Ser276 causing its activation was also significantly augmented in DEN exposed MTKO livers. NF?B targets that include early growth response genes and proinflammatory cytokines were significantly upregulated in MTKO mice. Concurrently, there was a remarkable increase (~100-fold) in Pai-1 expression, a significant increase in c-Jun, c-Fos, c-Myc, Ets2 and ATF3 expression and growth factor signaling that probably contributed to the increased tumor growth in MTKO mice. Taken together, these results demonstrate that metallothioneins protect mice from hepatocarcinogen-induced liver damage and carcinogenesis, underscoring their potential therapeutic application against hepatocellular cancer.

Majumder, Sarmila; Roy, Satavisha; Kaffenberger, Thomas; Wang, Bo; Costinean, Stefan; Frankel, Wendy; Bratasz, Anna; Kuppusamy, Periannan; Hai, Tsonwin; Ghoshal, Kalpana; Jacob, Samson T.

2010-01-01

66

MouseFinder: candidate disease genes from mouse phenotype data  

PubMed Central

Mouse phenotype data represents a valuable resource for the identification of disease-associated genes, especially where the molecular basis is unknown and there is no clue to the candidate gene’s function, pathway involvement or expression pattern. However, until recently these data have not been systematically used due to difficulties in mapping between clinical features observed in humans and mouse phenotype annotations. Here, we describe a semantic approach to solve this problem and demonstrate highly significant recall of known disease-gene associations and orthology relationships. A web application (MouseFinder; www.mousemodels.org) has been developed to allow users to search the results of our whole-phenome comparison of human and mouse. We demonstrate its use in identifying ARTN as a strong candidate gene within the 1p34.1-p32 mapped locus for a hereditary form of ptosis.

Chen, Chao-Kung; Mungall, Christopher J; Gkoutos, Georgios V; Doelken, Sandra C; Kohler, Sebastian; Ruef, Barbara J; Smith, Cynthia; Westerfield, Monte; Robinson, Peter N; Lewis, Suzanna E; Schofield, Paul N; Smedley, Damian

2012-01-01

67

Molecular cloning of two metallothionein-like protein genes with differential expression patterns from sweet potato (Ipomoea batatas) leaves.  

PubMed

Metallothionein (MT) is a group of proteins with low molecular masses and high cysteine contents, and is classified into different types, which in general contains two domains (domain 1 and domain 2) with typical amino acid sequences (Rauser 1999). In this report two full-length cDNAs (Y459 and G14) encoding MT-like proteins were isolated from leaves of sweet potato (Ipomoea batatas). Their open reading frames contained 249 and 195 nucleotides (82 and 64 amino acids) for Y459 and G14, respectively, and exhibited a relatively low amino acid sequence similarity (ca. 25.8%). Gene structure studies showed that Y459 had the conserved domain 1 region of type 2 MT; however, the domain 2 region was not conserved and contained additional amino acids between the CxC and CxC spacing. G14 had conserved domains 1 and 2 of type 4 MT except that the last CxC of domain 2 was changed to RxC. Semi-quantitative RT-PCR showed that Y459 was expressed in significant quantity in roots and stems, but was much less in green leaves. During natural and induced (with dark and ethephon, an ethylene-releasing compound, treatments) leaf senescence, Y459 gene expression was significantly enhanced. In contrast, relatively constant gene expression levels were found for G14 in all tissues or treatments analyzed. In conclusion, the two MT-like protein genes of sweet potato display differential gene structures and gene expression patterns, which may be associated with the diverse roles and functions they play in plant physiology in order to cope with particular developmental and environmental cues. PMID:12806784

Chen, Hsien-Jung; Hou, Wen-Chi; Yang, Chih-Yuan; Huang, Dong-Jiann; Liu, Jih-Shiou; Lin, Yaw-Huei

2003-05-01

68

Effect of cadmium on glutathione S-transferase and metallothionein gene expression in coho salmon liver, gill and olfactory tissues  

PubMed Central

The glutathione S-transferases (GSTs) are a multifunctional family of phase II enzymes that detoxify a variety of environmental chemicals, reactive intermediates, and secondary products of oxidative damage. GST mRNA expression and catalytic activity have been used as biomarkers of exposure to environmental chemicals. However, factors such as species differences in induction, partial analyses of multiple GST isoforms, and lack of understanding of fish GST gene regulation, have confounded the use of GST as markers of pollutant exposure. In the present study, we examined the effect of exposure to cadmium (Cd), a prototypical environmental contaminant and inducer of mammalian GST, on GST mRNA expression in coho salmon (Oncorhynchus kisutch) liver, gill, and olfactory tissues. GST expression data were compared to those for metallothionein (MT), a prototypical biomarker of metal exposure. Data mining of genomic databases led to the development of quantitative real-time PCR (qPCR) assays for salmon GST isoforms encompassing 9 subfamilies, including alpha, mu, pi, theta, omega, kappa, rho, zeta and microsomal GST. In vivo acute (8-48 hr) exposures to low (3.7 ppb) and high (347 ppb) levels of Cd relevant to environmental scenarios elicited a variety of transient, albeit minor changes (<2.5-fold) in tissue GST profiles, including some reductions in GST mRNA expression. In general, olfactory GSTs were the earliest to respond to cadmium, whereas, more pronounced effects in olfactory and gill GST expression were observed at 48 hr relative to earlier time points. Although evaluation of GSTs reflected a cadmium-associated oxidative stress response, there was no clear GST isoform in any tissue that could serve as a reliable biomarker of acute cadmium exposure. By contrast, metallothionein (MT) mRNA was consistently and markedly induced in all three tissues by cadmium, and among the tissues examined, olfactory MT was the most sensitive marker of cadmium exposures. In summary, coho salmon exhibit a complex GST tissue profile consisting of at least 9 isoforms, all of which are present in the peripheral olfactory system. Short-term exposure to environmental levels of Cd causes transient changes in salmon GST consistent with oxidative stress, and in some cases, includes a loss of GST. In a biomarker context, however, monitoring of tissue MT mRNA expression, especially in the peripheral olfactory system, may be of greater utility for assessing short-term environmental exposures to cadmium.

Espinoza, Herbert M.; Williams, Chase R.; Gallagher, Evan P.

2012-01-01

69

The olfactory receptor gene superfamily of the mouse  

Microsoft Academic Search

Olfactory receptor (OR) genes are the largest gene superfamily in vertebrates. We have identified the mouse OR genes from the nearly complete Celera mouse genome by a comprehensive data mining strategy. We found 1,296 mouse OR genes (including ?20% pseudogenes), which can be classified into 228 families. OR genes are distributed in 27 clusters on all mouse chromosomes except 12

Xinmin Zhang; Stuart Firestein

2002-01-01

70

Cloning and characterization of a gene coding for a novel metallothionein in the Pacific oyster Crassostrea gigas (CgMT2): a case of adaptive response to metal-induced stress?  

Microsoft Academic Search

Cases of heavy metal resistance acquisition have already been demonstrated in eukaryotes, which involve metallothionein (MT) gene duplication or amplification mechanisms. We characterized in a marine bivalve, Crassostrea gigas, a gene coding for an unusual MT, which has never been described in other species. Our results illustrate a unique case of exon duplication and rearrangement in the MT gene family.

Arnaud Tanguy; Dario Moraga

2001-01-01

71

Autism Candidate Genes via Mouse Phenomics  

PubMed Central

Autism spectrum disorders (ASD) represent a group of developmental disabilities with a strong genetic basis. The laboratory mouse is increasingly used as a model organism for ASD, and MGI, the Mouse Genome Informatics resource, is the primary model organism database for the laboratory mouse. MGI uses the Mammalian Phenotype (MP) ontology to describe mouse models of human diseases. Using bioinformatics tools including Phenologs, MouseNET, and the Ontological Discovery Environment, we tested data associated with MP terms to characterize new gene-phenotype associations related to ASD. Our integrative analysis using these tools identified numerous mouse genotypes that are likely to have previously uncharacterized autistic-like phenotypes. The genes implicated in these mouse models had considerable overlap with a set of over 300 genes recently associated with ASD due to small, rare copy number variation (Pinto D. et al, 2010). Prediction and characterization of autistic mutant mouse alleles assists researchers in studying the complex nature of ASD and provides a generalizable approach to candidate gene prioritization.

Meehan, Terrence F.; Carr, Christopher J.; Jay, Jeremy J.; Bult, Carol J.; Chesler, Elissa J.; Blake, Judith A.

2012-01-01

72

Type 4 metallothionein genes are involved in regulating Zn ion accumulation in late embryo and in controlling early seedling growth in Arabidopsis.  

PubMed

Type 4 metallothionein (MT) genes are recognized for their specific expression in higher plant seeds, but their functions are still unclear. In this study, the functions of two Arabidopsis metallothionein genes, AtMT4a and AtMT4b, are investigated in seed development, germination and early seedling growth. Transcriptional analysis showed that these two genes are specifically expressed in late embryos. Subcellular localization displayed that both AtMT4a and AtMT4b are widespread distributed in cytoplasm, nucleus and membrane. Co-silencing RNAi of AtMT4a and AtMT4b reduced seed weight and influenced the early seedling growth after germination, whereas overexpression of these two genes caused the opposite results. Detailed analysis showed clearly the correlation of AtMT4a and AtMT4b to the accumulation of some important metal ions in late embryos, especially to Zn ion storing in seeds, which then serves as part of early Zn ion resources for post-germinated seedling growth. Furthermore, phytohormone abscisic acid (ABA) and gibberellic acid (GA) may play roles in regulating the expression and function of AtMT4a and AtMT4b during seed development; and this may influence Zn accumulation in seeds and Zn ion nutrient supplementation in the early seedling growth after germination. PMID:22014117

Ren, Yujun; Liu, Yang; Chen, Hongyu; Li, Gang; Zhang, Xuelian; Zhao, Jie

2011-11-15

73

SmtB is a metal-dependent repressor of the cyanobacterial metallothionein gene smtA: identification of a Zn inhibited DNA-protein complex.  

PubMed Central

The smt locus of Synechococcus PCC 7942 contains a metal-regulated gene (smtA), which encodes a class II metallothionein, and a divergently transcribed gene, smtB, which encodes a repressor of smtA transcription. Regions containing cis-acting elements required for efficient induction, and required for smtB-dependent repression, of the smtA operator-promoter were identified. Specific interactions between proteins extracted from Synechococcus PCC 7942 and defined regions surrounding the smtA operator-promoter were detected by electrophoretic mobility shift assays. Three metallothionein operator-promoter associated complexes were identified, one of which (MAC1) showed Zn-dependent dissociation and involved a region of DNA immediately upstream of smtA. Treatment with Zn-chelators facilitated re-association of MAC1 in vitro. MAC1 was not observed in extracts from smt deficient mutants but was restored in extracts from mutants complemented with a plasmid borne smtB. SmtB is thus required for the formation of a Zn-responsive complex with the smt operator-promoter and based upon the predicted structure of SmtB we propose direct SmtB-DNA interaction exerting metal-ion inducible negative control. Images

Morby, A P; Turner, J S; Huckle, J W; Robinson, N J

1993-01-01

74

Breaking-off tissue specific activity of the oil palm metallothionein-like gene promoter in T(1) seedlings of tomato exposed to metal ions.  

PubMed

Metallothioneins (MTs) are cysteine-rich metal-binding proteins that are involved in cell growth regulation, transportation of metal ions and detoxification of heavy metals. A mesocarp-specific metallothionein-like gene (MT3-A) promoter was isolated from the oil palm (Elaeis guineensis Jacq). A vector construct containing the MT3-A promoter fused to the ?-glucuronidase (GUS) gene in the pCAMBIA 1304 vector was produced and used in Agrobacterium-mediated transformation of tomato. Histochemical GUS assay of different tissues of transgenic tomato showed that the MT3-A promoter only drove GUS expression in the reproductive tissues and organs, including the anther, fruit and seed coat. Competitive RT-PCR and GUS fluorometric assay showed changes in the level of GUS mRNA and enzyme activity in the transgenic tomato (T(0)). No GUS mRNA was found in roots and leaves of transgenic tomato. In contrast, the leaves of transgenic tomato seedlings (T(1)) produced the highest GUS activity when treated with 150 ?M Cu(2+) compared to the control (without Cu(2+)). However, Zn(2+) and Fe(2+) treatments did not show GUS expression in the leaves of the transgenic tomato seedlings. Interestingly, the results showed a breaking-off tissue-specific activity of the oil palm MT3-A promoter in T(1) seedlings of tomato when subjected to Cu(2+) ions. PMID:23290536

Kamaladini, Hossein; Nor Akmar Abdullah, Siti; Aziz, Maheran Abdul; Ismail, Ismanizan Bin; Haddadi, Fatemeh

2013-01-03

75

Mercury-Induced Cognitive Impairment in Metallothionein-1/2 Null Mice  

PubMed Central

Metallothioneins are central for the metabolism and detoxification of transition metals. Exposure to mercury during early neurodevelopment is associated with neurocognitive impairment. Given the importance of metallothioneins in mercury detoxification, metallothioneins may be a protective factor against mercury-induced neurocognitive impairment. Deletion of the murine metallothionein-1 and metallothionein-2 genes causes choice accuracy impairments in the 8-arm radial maze. We hypothesize that deletions of metallothioneins genes will make metallothionein-null mice more vulnerable to mercury-induced cognitive impairment. We tested this hypothesis by exposing MT1/MT2-null and wildtype mice to developmental mercury (HgCl2) and evaluated the resultant effects on cognitive performance on the 8-arm radial maze. During the early phase of learning metallothionein-null mice were more susceptible to mercury-induced impairment compared to wildtype. Neurochemical analysis of the frontal cortex revealed that serotonin levels were higher in metallothionein-null mice compared to wildtype mice. This effect was independent of mercury exposure. However, dopamine levels in mercury exposed metallothionein-null mice were lower compared to mercury-exposed wildtype mice. This work shows that deleting metallothioneins increase the vulnerability to developmental mercury-induced neurocognitive impairment. Metallothionein effects on monoamine transmitters may be related to this cognitive effect.

Eddins, Donnie; Petro, Ann; Pollard, Ninitia; Freedman, Jonathan H.; Levin, Edward D.

2009-01-01

76

Bis(L-cysteinato)zincate(lI) as a coordination compound that induces metallothionein gene transcription without inducing cell-stress-related gene transcription.  

PubMed

Zinc is an essential micronutrient, deficiency of which results in growth retardation, immunodeficiency, and neurological diseases such as dysgeusia. Several zinc coordination compounds are used for zinc supplementation; however, supplemented zinc ions have no specificity and interact with various groups of molecules. Here, we found that, from a library of 30 zinc coordination compounds, bis(L-cysteinato)zincate(II), designated Z01, functioned as a metallothionein (MT) inducer. Z01 induced MT expression mediated by the transcription factor MTF-1, without inducing cell-stress-related heme oxygenase-1 gene expression at specific concentration. The zinc ion was necessary for the MT induction. (65)Zn incorporation following treatment with (65)Zn-labeled Z01 suggested that Z01 did not act as zinc ionophore despite its hydrophilicity. Electrophoretic mobility shift assays revealed that Z01 facilitates MTF-1-MRE complex formation, and, by inference, transfer of zinc from Z01 to MTF-1. Phosphorylated ERK levels were increased by ZnSO(4) treatment but not by Z01. Although our data do not definitely prove that Z01 is an MTF-1-specific activator, our observations suggest that zinc coordination compounds can regulate zinc distribution and act as zinc donors for specific molecules. PMID:23085594

Kimura, Tomoki; Yoshida, Kengo; Yamamoto, Chika; Suzuki, Minako; Uno, Tomoko; Isobe, Masakazu; Naka, Hiroshi; Yasuike, Shuji; Satoh, Masahiko; Kaji, Toshiyuki; Uchiyama, Masanobu

2012-08-29

77

cDNA sequence encoding metallothionein protein from Aegiceras corniculatum and its gene expression induced by Pb(2+) and Cd (2+) stresses.  

PubMed

Constructing various green wetland examples for mangrove wetland systems is a useful way to use natural power to remediate the polluted wetlands at intertidal zones. Metallothioneins (MT) are involved in heavy metal tolerance, homeostasis, and detoxification of intracellular metal ions in plants. In order to understand the mechanism of heavy metal uptake in Aegiceras corniculatum, we isolated its metallothionein gene and studied the MT gene expression in response to heavy metals contamination. Here, we report the isolation and characterization of MT2 genes from young stem tissues of A. corniculatum growing in the cadmium (Cd) and lead (Pb) polluted wetlands of Quanzhou Bay, southeast of China. The obtained cDNA sequence of MT is 512 bp in length, and it has an open reading frame encoding 79 amino acid residues with a molecular weight of 7.92 kDa and the theoretical isoelectric point of 4.55. The amino acids include 14 cysteine residues and 14 glycine residues. It is a non-transmembrane hydrophilic protein. Sequence and homology analysis showed the MT protein sequence shared more than 60 % homology with other plant type 2 MT-like protein genes. The results suggested that the expression level of MT gene of A. corniculatum young stems induced by a certain range concentration of Cd(2+) and Pb(2+) stresses (0.2 mmol L(-1) Pb(2+), 1 mmol L(-1) Pb(2+), 0.2 mmol L(-1) Pb(2+), and 40 ?mmol L(-1) Cd(2+); 1 mmol L(-1) Pb(2+) and 40 ?mol L(-1) Cd(2+)) compared with control might show an adaptive protection. The expression levels of MT gene at 20 h stress treatment were higher than those at 480 h stress treatment. The expression levels of MT gene with 0.2 mmol L(-1) Pb(2+) stress treatment were higher than those with 0.2 mmol L(-1) Pb(2+) and 40 ?mol L(-1) Cd(2+) stress treatment, and the MT gene expression levels with 1 mmol L(-1) Pb(2+) treatment were higher than those with 1 mmol L(-1) Pb(2+) and 40 ?mol L(-1) Cd(2+) treatment. There exists an antagonistic action between Pb(2+) and Cd(2+) in the MT metabolization of A. corniculatum. PMID:23856811

Yuhong, Li; Atagana, Harrison I; Jingchun, Liu; Wenlin, Wu; Shijun, Wu

2013-07-16

78

Mouse Huntington's disease gene homolog ( Hdh )  

Microsoft Academic Search

The incurable neurodegenerative disorder, Huntington's disease (HD), is caused by an expanded, unstable CAG repeat encoding a stretch of polyglutamine in a 4p16.3 gene (HD) of unknown function. Near the CAG repeat is a polyproline-encoding CCG repeat that shows more limited allelic variation. The mouse homologue,Hdh, has been mapped to chromosome 5, in a region devoid of mutations causing any

Glenn T. Barnes; Mabel P. Duyao; Christine M. Ambrose; Sandra McNeil; Francesca Persichetti; Jayalakshmi Srinidhi; James F. Gusella; Marcy E. MacDonald

1994-01-01

79

Promoter architecture of mouse olfactory receptor genes.  

PubMed

Odorous chemicals are detected by the mouse main olfactory epithelium (MOE) by about 1100 types of olfactory receptors (OR) expressed by olfactory sensory neurons (OSNs). Each mature OSN is thought to express only one allele of a single OR gene. Major impediments to understand the transcriptional control of OR gene expression are the lack of a proper characterization of OR transcription start sites (TSSs) and promoters, and of regulatory transcripts at OR loci. We have applied the nanoCAGE technology to profile the transcriptome and the active promoters in the MOE. nanoCAGE analysis revealed the map and architecture of promoters for 87.5% of the mouse OR genes, as well as the expression of many novel noncoding RNAs including antisense transcripts. We identified candidate transcription factors for OR gene expression and among them confirmed by chromatin immunoprecipitation the binding of TBP, EBF1 (OLF1), and MEF2A to OR promoters. Finally, we showed that a short genomic fragment flanking the major TSS of the OR gene Olfr160 (M72) can drive OSN-specific expression in transgenic mice. PMID:22194471

Plessy, Charles; Pascarella, Giovanni; Bertin, Nicolas; Akalin, Altuna; Carrieri, Claudia; Vassalli, Anne; Lazarevic, Dejan; Severin, Jessica; Vlachouli, Christina; Simone, Roberto; Faulkner, Geoffrey J; Kawai, Jun; Daub, Carsten O; Zucchelli, Silvia; Hayashizaki, Yoshihide; Mombaerts, Peter; Lenhard, Boris; Gustincich, Stefano; Carninci, Piero

2011-12-22

80

Promoter architecture of mouse olfactory receptor genes  

PubMed Central

Odorous chemicals are detected by the mouse main olfactory epithelium (MOE) by about 1100 types of olfactory receptors (OR) expressed by olfactory sensory neurons (OSNs). Each mature OSN is thought to express only one allele of a single OR gene. Major impediments to understand the transcriptional control of OR gene expression are the lack of a proper characterization of OR transcription start sites (TSSs) and promoters, and of regulatory transcripts at OR loci. We have applied the nanoCAGE technology to profile the transcriptome and the active promoters in the MOE. nanoCAGE analysis revealed the map and architecture of promoters for 87.5% of the mouse OR genes, as well as the expression of many novel noncoding RNAs including antisense transcripts. We identified candidate transcription factors for OR gene expression and among them confirmed by chromatin immunoprecipitation the binding of TBP, EBF1 (OLF1), and MEF2A to OR promoters. Finally, we showed that a short genomic fragment flanking the major TSS of the OR gene Olfr160 (M72) can drive OSN-specific expression in transgenic mice.

Plessy, Charles; Pascarella, Giovanni; Bertin, Nicolas; Akalin, Altuna; Carrieri, Claudia; Vassalli, Anne; Lazarevic, Dejan; Severin, Jessica; Vlachouli, Christina; Simone, Roberto; Faulkner, Geoffrey J.; Kawai, Jun; Daub, Carsten O.; Zucchelli, Silvia; Hayashizaki, Yoshihide; Mombaerts, Peter; Lenhard, Boris; Gustincich, Stefano; Carninci, Piero

2012-01-01

81

ScMT2-1-3, a Metallothionein Gene of Sugarcane, Plays an Important Role in the Regulation of Heavy Metal Tolerance/Accumulation  

PubMed Central

Plant metallothioneins (MTs), which are cysteine-rich, low-molecular-weight, and metal-binding proteins, play important roles in detoxification, metal ion homeostasis, and metal transport adjustment. In this study, a novel metallothionein gene, designated as ScMT2-1-3 (GenBank Accession number JQ627644), was identified from sugarcane. ScMT2-1-3 was 700?bp long, including a 240?bp open reading frame (ORF) encoding 79 amino acid residues. A His-tagged ScMT2-1-3 protein was successfully expressed in Escherichia coli system which had increased the host cell's tolerance to Cd2+, Cu2+, PEG, and NaCl. The expression of ScMT2-1-3 was upregulated under Cu2+ stress but downregulated under Cd2+ stress. Real-time qPCR demonstrated that the expression levels of ScMT2-1-3 in bud and root were over 14 times higher than those in stem and leaf, respectively. Thus, both the E. coli assay and sugarcane plantlets assay suggested that ScMT2-1-3 is significantly involved in the copper detoxification and storage in the cell, but its functional mechanism in cadmium detoxification and storage in sugarcane cells needs more testification though its expressed protein could obviously increase the host E. coli cell's tolerance to Cd2+. ScMT2-1-3 constitutes thus a new interesting candidate for elucidating the molecular mechanisms of MTs-implied plant heavy metal tolerance/accumulation and for developing sugarcane phytoremediator varieties.

Guo, Jinlong; Xu, Liping; Su, Yachun; Wang, Hengbo; Gao, Shiwu; Xu, Jingsheng; Que, Youxiong

2013-01-01

82

Role of oxidative stress in the induction of metallothionein-2A and heme oxygenase-1 gene expression by the antineoplastic agent gallium nitrate in human lymphoma cells.  

PubMed

The mechanisms of action of gallium nitrate, an antineoplastic drug, are only partly understood. Using a DNA microarray to examine genes induced by gallium nitrate in CCRF-CEM cells, we found that gallium increased metallothionein-2A (MT2A) and heme oxygenase-1 (HO-1) gene expression and altered the levels of other stress-related genes. MT2A and HO-1 were increased after 6 and 16 h of incubation with gallium nitrate. An increase in oxidative stress, evidenced by a decrease in cellular GSH and GSH/GSSG ratio, and an increase in dichlorodihydrofluorescein (DCF) fluorescence, was seen after 1-4 h of incubation of cells with gallium nitrate. DCF fluorescence was blocked by the mitochondria-targeted antioxidant mitoquinone. N-Acetyl-L-cysteine blocked gallium-induced MT2A and HO-1 expression and increased gallium's cytotoxicity. Studies with a zinc-specific fluoroprobe suggested that gallium produced an expansion of an intracellular labile zinc pool, suggesting an action of gallium on zinc homeostasis. Gallium nitrate increased the phosphorylation of p38 mitogen-activated protein kinase and activated Nrf-2, a regulator of HO-1 gene transcription. Gallium-induced Nrf-2 activation and HO-1 expression were diminished by a p38 MAP kinase inhibitor. We conclude that gallium nitrate induces cellular oxidative stress as an early event which then triggers the expression of HO-1 and MT2A through different pathways. PMID:18586083

Yang, Meiying; Chitambar, Christopher R

2008-06-14

83

Expression of a metallothionein A1 gene of Pisum sativum in white poplar enhances tolerance and accumulation of zinc and copper.  

PubMed

Metallothioneins (MT) play an important role in heavy metal detoxification and homeostasis of intracellular metal ions in plant. In this study, two transgenic lines expressing MT type 2 gene (PsMT(A1)) from Pisum sativum, a regenerated non transformed line NT and clone AL22, selected as heavy metal tolerant, were characterized in presence of the heavy metals for the ability to accumulate zinc and copper and to activate antioxidative enzyme defences: superoxide dismutase, catalase, ascorbate peroxidase. The levels of expression of MT type 2 gene assessed by RT-qPCR confirmed the gene over-expression in transgenic lines and evidenced in NT and AL22 the up-regulation of gene transcription by zinc and copper. Transgenic poplar lines during heavy metal stress displayed increased ability to translocate and accumulate zinc and copper compared with NT and AL22. The antioxidant enzyme defence was differently activated in response to metals in the transgenic lines without a significant increase of ROS. These results suggested that PsMT(A1) could play a role in ROS scavenging leading to enhanced metal tolerance and increased zinc and copper sequestration in root and leaf. PMID:22195577

Turchi, Adelaide; Tamantini, Ivano; Camussi, Alessandro M; Racchi, Milvia Luisa

2011-11-17

84

Metallothionein and the Biology of Aging  

PubMed Central

Metallothionein (MT) is a low molecular weight protein with anti-apoptotic properties that has been demonstrated to scavenge free radicals in vitro. MT has not been extensively investigated within the context of aging biology. The purpose of this review, therefore, is to discuss findings on MT that are relevant to basic aging mechanisms and to draw attention to the possible role of MT in pro-longevity interventions. MT is one of just a handful of proteins that, when overexpressed, has been demonstrated to increase mouse lifespan. MT also protects against development of obesity in mice provided a high fat diet as well as diet-induced oxidative stress damage. Abundance of MT is responsive to caloric restriction (CR) and inhibition of the insulin / insulin-like signaling (IIS) pathway, and elevated MT gene expression has been observed in tissues from fasted and CR-fed mice, long-lived dwarf mice, worms maintained under CR conditions, and long-lived daf-2 mutant worms. The dysregulation of MT in these systems is likely to have tissue-specific effects on aging outcomes. Further investigation will therefore be needed to understand how MT contributes to the response of invertebrates and mice to CR and the endocrine mutations studied by aging researchers.

Swindell, William R.

2010-01-01

85

Metallothionein and the biology of aging.  

PubMed

Metallothionein (MT) is a low molecular weight protein with anti-apoptotic properties that has been demonstrated to scavenge free radicals in vitro. MT has not been extensively investigated within the context of aging biology. The purpose of this review, therefore, is to discuss findings on MT that are relevant to basic aging mechanisms and to draw attention to the possible role of MT in pro-longevity interventions. MT is one of just a handful of proteins that, when overexpressed, has been demonstrated to increase mouse lifespan. MT also protects against development of obesity in mice provided a high fat diet as well as diet-induced oxidative stress damage. Abundance of MT is responsive to caloric restriction (CR) and inhibition of the insulin/insulin-like signaling (IIS) pathway, and elevated MT gene expression has been observed in tissues from fasted and CR-fed mice, long-lived dwarf mice, worms maintained under CR conditions, and long-lived daf-2 mutant worms. The dysregulation of MT in these systems is likely to have tissue-specific effects on aging outcomes. Further investigation will therefore be needed to understand how MT contributes to the response of invertebrates and mice to CR and the endocrine mutations studied by aging researchers. PMID:20933613

Swindell, William R

2010-10-08

86

Target gene search for the metal-responsive transcription factor MTF1  

Microsoft Academic Search

Activation of genes by heavy metals, notably zinc, cadmium and copper, depends on MTF-1, a unique zinc finger transcription factor conserved from insects to human. Knockout of MTF-1 in the mouse results in embryonic lethality due to liver decay, while knockout of its best characterized target genes, the stress-inducible metallothionein genes I and II, is viable, suggesting additional target genes

P. Lichtlen; Y. Wang; T. Belser; O. Georgiev; U. Certa; R. Sack; W. Schaffner

2001-01-01

87

Inhibitors of Histone Deacetylase and DNA Methyltransferase Synergistically Activate the Methylated Metallothionein I Promoter by Activating the Transcription Factor MTF1 and Forming an Open Chromatin Structure  

Microsoft Academic Search

Inhibitors of DNA methyltransferase (Dnmt) and histone deacetylases (HDAC) synergistically activate the methylated metallothionein I gene (MT-I) promoter in mouse lymphosarcoma cells. The cooperative effect of these two classes of inhibitors on MT-I promoter activity was robust following demethylation of only a few CpG dinucleotides by brief exposure to 5-azacytidine (5-AzaC) but persisted even after prolonged treatment with the nucleoside

Kalpana Ghoshal; Jharna Datta; Sarmila Majumder; Shoumei Bai; Xiaocheng Dong; Mark Parthun; Samson T. Jacob

2002-01-01

88

Genome-wide identification of rice class I metallothionein gene: tissue expression patterns and induction in response to heavy metal stress.  

PubMed

Metallothioneins (MTs) are members of a family of cysteine-rich low molecular weight polypeptides which play an important role in heavy metal detoxification and homeostasis of intracellular metal ions in plant. Though MT genes from some selected plants have been characterized with respect to their protein sequences, kinetic properties and tissue-specific localization, no detailed study has been carried out in rice. Here, we present genome-wide identification, structural and expression analyses of rice MT gene family. Our analysis suggests presence of 11 class I MT genes in rice genome (Release 7 of the MSU Rice Genome Annotation Project) which are differentially expressed during growth and development, in various tissues and during biotic and abiotic stresses. Our analyses suggest that class I MT proteins in rice differ in tissue localization as well as in heavy metal coordination chemistry. We also suggest that some MTs have a predominant role in detoxification of As (V) in arsenic-tolerant rice cultivars. Our analysis suggests that apart from transcriptional regulation, post-transcriptional alternative splicing in some members of this family takes place during growth and development, in various tissues and during biotic and abiotic stresses. PMID:23053198

Gautam, Neelam; Verma, Pankaj Kumar; Verma, Shikha; Tripathi, Rudra Deo; Trivedi, Prabodh Kumar; Adhikari, Bijan; Chakrabarty, Debasis

2012-10-10

89

Arsenic-induced aberrant gene expression in fetal mouse primary liver-cell cultures.  

PubMed

Exposure of maternal mice to inorganic arsenic through the drinking water induces liver tumors and aberrant gene expression in offspring when they reach adulthood. To help define if these are direct fetal effects of arsenic, fetal liver cells were isolated from untreated mice at gestation day 13.5 by mechanical dissection and centrifugation. Two hours after seeding the cells on collagen1-coated plates in William E media containing 10% fetal bovine serum, 1x ITS (insulin, transferrin, and selenium) and antibiotics, inorganic arsenite (0, 0.1, 0.3, and 1.0 microM) was added to the fresh media for 72 h. Cell morphology and viability were not significantly altered by these arsenic concentrations. At the end of arsenic exposure, cells were harvested into Trizol, and total RNA was extracted, purified, and subjected to real-time reverse transcriptase polymerase chain reaction (RT-PCR) analysis. Arsenite exposure produced a concentration-dependent induction of heme oxygenase-1 (up to eight-fold) and metallothionein-1 (up to five-fold), indicative of stress response to adapt to arsenic insult. Expression of genes related to steroid metabolism, such as 17beta-hydroxysteroid dehydrogenase-7 (HSD17beta7) and Cyp2a4, were increased approximately two-fold, together with increases in estrogen receptor-alpha (ER-alpha) and ER-alpha-linked genes, such as anterior gradient-2, keratin 1-19, and trefoil factor-3. Arsenic in vitro induced a three-fold increase in the expression of alpha-fetoprotein (AFP), a biomarker associated with transplacental arsenic-induced mouse liver tumors. Thus, exposure of mouse fetal liver cells to arsenic induces adaptive responses and aberrant gene expression, which could alter genetic programming at a very early life stage, potentially contributing to tumor formation much later in life. PMID:18991936

Liu, Jie; Yu, Limei; Tokar, Erik J; Bortner, Carl; Sifre, Maria I; Sun, Yang; Waalkes, Michael P

2008-10-01

90

Prevalence of Flavobacterium psychrophilum bacterial cells in farmed rainbow trout: characterization of metallothionein A and interleukin1-? genes as markers overexpressed in spleen and kidney of diseased fish.  

PubMed

The aim of the present study was to assess the prevalence of the flavobacteria within farmed trout and to quantify their bacterial burden. A total of 61 fish were sampled from seven farms, and were distributed in two groups: (1) visibly diseased fish suffering from the rainbow trout fry syndrome or the bacterial cold water disease caused by the bacteria Flavobacterium psychrophilum and (2) normally appearing fish. F. psychrophilum cells were titered by qPCR, targeting a specific area of the 16S rRNA gene in skin, muscle, gills, liver, spleen and kidney from all fish. The pathogen was detected in these organs whatever the health status, with titers ranging from 10(4) to 6 × 10(7)bacteria/g of tissue in normally appearing fish, thus showing they were bacterial carriers. Two organs allowed differentiation between diseased and normally appearing fish: spleen and kidney, with titers ranging from 10(6) to 10(7)bacteria/g of tissue in normally appearing fish vs 10(11) to 10(12)bacteria/g of tissue in diseased fish. No relationship was found between immunoglobulin M-like titer in plasma and health status. Gene expression analysis in fish organs revealed two genes that were markers of the bacterial infection: mt-a and il-1? genes encoding the metallothionein A and the interleukin1-?, respectively. These genes were both over-expressed in gills, liver, spleen and kidney of diseased fish. Four genes encoding immunity markers were down-regulated in spleen (a key organ implicated in immunity) of diseased fish: tgf-?, cd8-?, mhc2-? and igt, suggesting a weakened immune system in diseased fish. PMID:22989515

Orieux, Nicolas; Douet, Diane-Gaëlle; Le Hénaff, Michel; Bourdineaud, Jean-Paul

2012-08-29

91

EXAFS studies of metallothionein  

NASA Astrophysics Data System (ADS)

Extended X-ray absorption fine structure (EXAFS) spectroscopy has been used to investigate the metal coordination in several iron, cobalt, and cadmium metallothioneins. The samples examined comprised Fe7-, Fe3-, Co7-, Co3-, Cd4Co3-, and Cd7- metallothioneins, which are shown to coordinate only to sulphur atoms of cysteinyl residues in the protein. The data for the Cd7- protein were recorded of a freeze-dried sample at 35 K, and the remaining data were recorded of aqueous solutions at room temperature.

Charnock, J. M.; Garner, C. D.; Abrahams, I. L.; Arber, J. M.; Hasnain, S. S.; Henehan, C.; Vasak, M.

1989-06-01

92

Metallothionein expression in chloroplasts enhances mercury accumulation and phytoremediation capability.  

PubMed

Genetic engineering to enhance mercury phytoremediation has been accomplished by expression of the merAB genes that protects the cell by converting Hg[II] into Hg[0] which volatilizes from the cell. A drawback of this approach is that toxic Hg is released back into the environment. A better phytoremediation strategy would be to accumulate mercury inside plants for subsequent retrieval. We report here the development of a transplastomic approach to express the mouse metallothionein gene (mt1) and accumulate mercury in high concentrations within plant cells. Real-time PCR analysis showed that up to 1284 copies of the mt1 gene were found per cell when compared with 1326 copies of the 16S rrn gene, thereby attaining homoplasmy. Past studies in chloroplast transformation used qualitative Southern blots to evaluate indirectly transgene copy number, whereas we used real-time PCR for the first time to establish homoplasmy and estimate transgene copy number and transcript levels. The mt1 transcript levels were very high with 183,000 copies per ng of RNA or 41% the abundance of the 16S rrn transcripts. The transplastomic lines were resistant up to 20 ?m mercury and maintained high chlorophyll content and biomass. Although the transgenic plants accumulated high concentrations of mercury in all tissues, leaves accumulated up to 106 ng, indicating active phytoremediation and translocation of mercury. Such accumulation of mercury in plant tissues facilitates proper disposal or recycling. This study reports, for the first time, the use of metallothioneins in plants for mercury phytoremediation. Chloroplast genetic engineering approach is useful to express metal-scavenging proteins for phytoremediation. PMID:21518240

Ruiz, Oscar N; Alvarez, Derry; Torres, Cesar; Roman, Laura; Daniell, Henry

2011-04-24

93

The biology of novel animal genes: Mouse APEX gene knockout  

SciTech Connect

This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The controlled breeding of novel genes into mice, including the gene knockout (KO), or conversely by adding back transgenes provide powerful genetic technologies that together suffice to determine in large part the biological role(s) of novel genes. Inbred mouse remains the best understood and most useful mammalian experimental system available for tackling the biology of novel genes. The major mammalian apurinic/apyrimidinic (AP) endonuclease (APE), is involved in a key step in the repair of spontaneous and induced AP sites in DNA. Efficient repair of these lesions is imperative to prevent the stable incorporation of mutations into the cellular genome which may lead to cell death or transformation. Loss or modulation of base excison repair activity in vivo may elevate the spontaneous mutation rate in cells, and may lead to a substantial increase in the incidence of cancer. Despite extensive biochemical analysis, however, the significance of these individual APE functions in vivo has not been elucidated. Mouse embryonic stem (ES) cells heterozygous for a deletion mutation in APE have been generated and whole animals containing the APE mutation have been derived from these ES cells. Animals homozygous for the APE null mutation die early in gestation, underscoring the biological significance of this DNA repair gene.

MacInnes, M.; Altherr, M.R.; Ludwig, D. [Los Alamos National Lab., NM (United States); Pedersen, R.; Mold, C. [Univ. of California, San Francisco, CA (United States)

1997-07-01

94

Gene Expression Profile Analysis of Type 2 Diabetic Mouse Liver  

PubMed Central

Liver plays a key role in glucose metabolism and homeostasis, and impaired hepatic glucose metabolism contributes to the development of type 2 diabetes. However, the precise gene expression profile of diabetic liver and its association with diabetes and related diseases are yet to be further elucidated. In this study, we detected the gene expression profile by high-throughput sequencing in 9-week-old normal and type 2 diabetic db/db mouse liver. Totally 12132 genes were detected, and 2627 genes were significantly changed in diabetic mouse liver. Biological process analysis showed that the upregulated genes in diabetic mouse liver were mainly enriched in metabolic processes. Surprisingly, the downregulated genes in diabetic mouse liver were mainly enriched in immune-related processes, although all the altered genes were still mainly enriched in metabolic processes. Similarly, KEGG pathway analysis showed that metabolic pathways were the major pathways altered in diabetic mouse liver, and downregulated genes were enriched in immune and cancer pathways. Analysis of the key enzyme genes in fatty acid and glucose metabolism showed that some key enzyme genes were significantly increased and none of the detected key enzyme genes were decreased. In addition, FunDo analysis showed that liver cancer and hepatitis were most likely to be associated with diabetes. Taken together, this study provides the digital gene expression profile of diabetic mouse liver, and demonstrates the main diabetes-associated hepatic biological processes, pathways, key enzyme genes in fatty acid and glucose metabolism and potential hepatic diseases.

Zhang, Fang; Xu, Xiang; Zhang, Yi; Zhou, Ben; He, Zhishui; Zhai, Qiwei

2013-01-01

95

Cloning, characterization and targeting of the mouse HEXA gene  

Microsoft Academic Search

The HEXA gene, encoding the α subunit of β-hexosaminidase A, is essential for the metabolism of ganglioside G{sub M2}, and defects in this gene cause Tay-Sachs disease in humans. To elucidate the role of the gene in the nervous system of the mouse and to establish a mouse model of Tay-Sachs disease, we have cloned and characterized the HEXA gene

N. Wakamatsu; J. M. Trasler; R. A. Gravel

1994-01-01

96

Characterization and use of the Drosophila metallothionein promoter in cultured Drosophila melanogaster cells.  

PubMed Central

The promoter from the metallothionein gene may be a useful conditional promoter for the construction of chimeric genes to be expressed in Drosophila cells in culture. To explore this possibility the responses of the endogenous metallothionein gene and an in vitro constructed chimeric gene containing the metallothionein promoter were examined. Copper and cadmium, when added to the growth medium of Drosophila Schneider's line 2 cells, can produce a 30-100 fold induction of metallothionein mRNA levels. The level of induction depends on the amount of copper or cadmium added to the medium and these mRNA levels remain high for at least four days. Copper is less toxic than cadmium and does not induce a typical heat-shock response in the cells. Finally, a chimeric gene containing the metallothionein promoter shows a similar induction when transformed into the cells. Images

Bunch, T A; Grinblat, Y; Goldstein, L S

1988-01-01

97

A mouse homeo box - containing gene maps near a developmental mutation  

Microsoft Academic Search

Mouse genes containing homeo box domains are predicted to fulfill important functions in embryogenesis. Using recombinant inbred mouse strains, we have mapped a mouse gene which contains a homeo box with homology to the Drosophila engrailed gene. This gene maps to mouse chromosome 1 near or at the dominant hemimelia locus which is a known mouse developmental mutation.Copyright © 1987

R. E. Hill; A. E. Hall; C. M. Sime; N. D. Hastie

1987-01-01

98

Tetrahymena Metallothioneins Fall into Two Discrete Subfamilies  

PubMed Central

Background Metallothioneins are ubiquitous small, cysteine-rich, multifunctional proteins which can bind heavy metals. Methodology/Principal Findings We report the results of phylogenetic and gene expression analyses that include two new Tetrahymena thermophila metallothionein genes (MTT3 and MTT5). Sequence alignments of all known Tetrahymena metallothioneins have allowed us to rationalize the structure of these proteins. We now formally subdivide the known metallothioneins from the ciliate genus Tetrahymena into two well defined subfamilies, 7a and 7b, based on phylogenetic analysis, on the pattern of clustering of Cys residues, and on the pattern of inducibility by the heavy metals Cd and Cu. Sequence alignment also reveals a remarkably regular, conserved and hierarchical modular structure of all five subfamily 7a MTs, which include MTT3 and MTT5. The former has three modules, while the latter has only two. Induction levels of the three T. thermophila genes were determined using quantitative real time RT-PCR. Various stressors (including heavy metals) brought about dramatically different fold-inductions for each gene; MTT5 showed the highest fold-induction. Conserved DNA motifs with potential regulatory significance were identified, in an unbiased way, upstream of the start codons of subfamily 7a MTs. EST evidence for alternative splicing in the 3? UTR of the MTT5 mRNA with potential regulatory activity is reported. Conclusion/Significance The small number and remarkably regular structure of Tetrahymena MTs, coupled with the experimental tractability of this model organism for studies of in vivo function, make it an attractive system for the experimental dissection of the roles, structure/function relationships, regulation of gene expression, and adaptive evolution of these proteins, as well as for the development of biotechnological applications for the environmental monitoring of toxic substances.

Campos, Virginia; Benitez, Laura; Martin-Gonzalez, Ana; Hamilton, Eileen P.; Orias, Eduardo; Gutierrez, Juan C.

2007-01-01

99

Accessing novel developmental mechanisms in the mouse by gene trapping  

Microsoft Academic Search

Genetic analysis is a powerful method for analyzing the function of specific genes in development. I sought to identify novel genes in the mouse using a genetic analysis relying on the expression pattern and phenotype of mutated genes. To this end, I have conducted a gene trap screen using the vector $\\\\rm SA\\\\beta geo,$ a promoterless DNA construct that encodes

Daniel Scudder Wagner

1997-01-01

100

Tissue- and cell-specific expression of metallothionein genes in cadmium- and copper-exposed mussels analyzed by in situ hybridization and RT-PCR  

SciTech Connect

Metallothioneins (MTs) are metal-inducible proteins that can be used as biomarkers of metal exposure. In mussels two families of MT isoforms (MT10 and MT20) have been characterized. In this study, mussels (Mytilus galloprovincialis) were exposed to 200 ppb Cd and 40 ppb Cu for 2 and 9 days to characterize the tissue and isoform specificity of metal-induced MT expression. Non-radioactive in situ hybridization demonstrated that both MT isoforms were mainly transcribed in digestive tubule epithelial cells, especially in basophilic cells. Weaker MT expression was detected in non-ciliated duct cells, stomach and gill epithelial cells, haemocytes, adipogranular cells, spermatic follicles and oocytes. RT-PCR resulted in cloning of a novel M. galloprovincialis isoform homologous to recently cloned Mytilus edulis intron-less MT10B isoform. In gills, Cd only affected MT10 gene expression after 2 days of exposure while increases in MT protein levels occurred at day 9. In the digestive gland, a marked increase of both isoforms, but especially of MT20, was accompanied by increased levels of MT proteins and basophilic cell volume density (Vv{sub BAS}) after 2 and 9 days and of intralysosomal metal accumulation in digestive cells after 9 days. Conversely, although metal was accumulated in digestive cells lysosomes and the Vv{sub BAS} increased in Cu-exposed mussels, Cu exposure did not produce an increase of MT gene expression or MT protein levels. These data suggest that MTs are expressed in a tissue-, cell- and isoform-specific way in response to different metals.

Zorita, I. [Lab. Cell Biology and Histology, Dept. Zoology and Animal Cell Biology, University of the Basque Country, PO Box 644, E-48080 Bilbao, Basque Country (Spain); Bilbao, E. [Lab. Cell Biology and Histology, Dept. Zoology and Animal Cell Biology, University of the Basque Country, PO Box 644, E-48080 Bilbao, Basque Country (Spain); Schad, A. [Institute of Pathology, Johannes Gutenberg University, 55101, Mainz (Germany); Cancio, I. [Lab. Cell Biology and Histology, Dept. Zoology and Animal Cell Biology, University of the Basque Country, PO Box 644, E-48080 Bilbao, Basque Country (Spain); Soto, M. [Lab. Cell Biology and Histology, Dept. Zoology and Animal Cell Biology, University of the Basque Country, PO Box 644, E-48080 Bilbao, Basque Country (Spain); Cajaraville, M.P. [Lab. Cell Biology and Histology, Dept. Zoology and Animal Cell Biology, University of the Basque Country, PO Box 644, E-48080 Bilbao, Basque Country (Spain)]. E-mail: mirenp.cajaraville@ehu.es

2007-04-15

101

Tissue- and cell-specific expression of metallothionein genes in cadmium- and copper-exposed mussels analyzed by in situ hybridization and RT-PCR.  

PubMed

Metallothioneins (MTs) are metal-inducible proteins that can be used as biomarkers of metal exposure. In mussels two families of MT isoforms (MT10 and MT20) have been characterized. In this study, mussels (Mytilus galloprovincialis) were exposed to 200 ppb Cd and 40 ppb Cu for 2 and 9 days to characterize the tissue and isoform specificity of metal-induced MT expression. Non-radioactive in situ hybridization demonstrated that both MT isoforms were mainly transcribed in digestive tubule epithelial cells, especially in basophilic cells. Weaker MT expression was detected in non-ciliated duct cells, stomach and gill epithelial cells, haemocytes, adipogranular cells, spermatic follicles and oocytes. RT-PCR resulted in cloning of a novel M. galloprovincialis isoform homologous to recently cloned Mytilus edulis intron-less MT10B isoform. In gills, Cd only affected MT10 gene expression after 2 days of exposure while increases in MT protein levels occurred at day 9. In the digestive gland, a marked increase of both isoforms, but especially of MT20, was accompanied by increased levels of MT proteins and basophilic cell volume density (Vv(BAS)) after 2 and 9 days and of intralysosomal metal accumulation in digestive cells after 9 days. Conversely, although metal was accumulated in digestive cells lysosomes and the Vv(BAS) increased in Cu-exposed mussels, Cu exposure did not produce an increase of MT gene expression or MT protein levels. These data suggest that MTs are expressed in a tissue-, cell- and isoform-specific way in response to different metals. PMID:17350662

Zorita, I; Bilbao, E; Schad, A; Cancio, I; Soto, M; Cajaraville, M P

2007-01-18

102

Chromosomal localization of the human and mouse hyaluronan synthase genes  

SciTech Connect

We have recently identified a new vertebrate gene family encoding putative hyaluronan (HA) synthases. Three highly conserved related genes have been identified, designated HAS1, HAS2, and HAS3 in humans and Has1, Has2, and Has3 in the mouse. All three genes encode predicted plasma membrane proteins with multiple transmembrane domains and approximately 25% amino acid sequence identity to the Streptococcus pyogenes HA synthase, HasA. Furthermore, expression of any one HAS gene in transfected mammalian cells leads to high levels of HA biosynthesis. We now report the chromosomal localization of the three HAS genes in human and in mouse. The genes localized to three different positions within both the human and the mouse genomes. HAS1 was localized to the human chromosome 19q13.3-q13.4 boundary and Has1 to mouse Chr 17. HAS2 was localized to human chromosome 8q24.12 and Has2 to mouse Chr 15. HAS3 was localized to human chromosome 16q22.1 and Has3 to mouse Chr 8. The map position for HAS1 reinforces the recently reported relationship between a small region of human chromosome 19q and proximal mouse chromosome 17. HAS2 mapped outside the predicted critical region delineated for the Langer-Giedion syndrome and can thus be excluded as a candidate gene for this genetic syndrome. 33 refs., 2 figs.

Spicer, A.P.; McDonald, J.A. [Mayo Clinic Scottsdale, AZ (United States); Seldin, M.F. [Univ. of California Davis, CA (United States)] [and others

1997-05-01

103

Brain Metallothionein in Stress  

Microsoft Academic Search

Brain metallothionein (MT) levels have been measured in the rat brain in basal and stress situations with polyclonal antibodies which do not cross-react significantly with the brain-specific MT isoform growth inhibitory factor (MT-III). Acute immobilization stress increases MT levels in most but not all brain areas. In contrast, chronic immobilization stress has no effect on MT levels. Although glucocorticoids and

Juan Hidalgo; Teresa Gasull; Mercedes Giralt; Antonio Armario

1994-01-01

104

Mapping of the mouse homologue of the Wilson disease gene to mouse chromosome 8  

SciTech Connect

ATP7B, the gene altered in Wilson disease (WD) patients, lies in a block of homology shared between human chromosome 13q14 and the central region of mouse chromosome 14. However, we have mapped the murine homologue of ATP7B (Atp7b) to mouse chromosome 8 by somatic cell hybrid analysis. Analysis of 80 interspecific backcross offspring was used to position Atp7b close to D8Mit3 and another ATPase locus, Atp4b, on mouse chromosome 8. ATP4B lies in 13q34 and is separated from ATP7B by several loci whose mouse homologues map to mouse chromosome 14. The assignment of Atp7b to mouse chromosome 8 identifies a previously unrecognized region of homology between this chromosome and human chromosome 13. This assignment suggests a possible location for the toxic milk mutation in the mouse, which has been proposed as a homologue of WD. 17 refs., 2 figs.

Reed, V.; Williamson, P.; Boyd, Y. [MRC Radiobiology Unit, Toronto (Canada)] [and others

1995-08-10

105

A family knockout of all four Drosophila metallothioneins reveals a central role in copper homeostasis and detoxification.  

PubMed

Metallothioneins are ubiquitous, small, cysteine-rich proteins with the ability to bind heavy metals. In spite of their biochemical characterization, their in vivo function remains elusive. Here, we report the generation of a metallothionein gene family knockout in Drosophila melanogaster by targeted disruption of all four genes (MtnA to -D). These flies are viable if raised in standard laboratory food. During development, however, they are highly sensitive to copper, cadmium, and (to a lesser extent) zinc load. Metallothionein expression is particularly important for male viability; while copper load during development affects males and females equally, adult males lacking metallothioneins display a severely reduced life span, possibly due to copper-mediated oxidative stress. Using various reporter gene constructs, we find that different metallothioneins are expressed with virtually the same tissue specificity in larvae, notably in the intestinal tract at sites of metal accumulation, including the midgut's "copper cells." The same expression pattern is observed with a synthetic minipromoter consisting only of four tandem metal response elements. From these and other experiments, we conclude that tissue specificity of metallothionein expression is a consequence, rather than a cause, of metal distribution in the organism. The bright orange luminescence of copper accumulated in copper cells of the midgut is severely reduced in the metallothionein gene family knockout, as well as in mutants of metal-responsive transcription factor 1 (MTF-1), the main regulator of metallothionein expression. This indicates that an in vivo metallothionein-copper complex forms the basis of this luminescence. Strikingly, metallothionein mutants show an increased, MTF-1-dependent induction of metallothionein promoters in response to copper, cadmium, silver, zinc, and mercury. We conclude that free metal, but not metallothionein-bound metal, triggers the activation of MTF-1 and that metallothioneins regulate their own expression by a negative feedback loop. PMID:16508004

Egli, Dieter; Yepiskoposyan, Hasmik; Selvaraj, Anand; Balamurugan, Kuppusamy; Rajaram, Rama; Simons, Andreas; Multhaup, Gerd; Mettler, Simone; Vardanyan, Alla; Georgiev, Oleg; Schaffner, Walter

2006-03-01

106

Gene models of schizophrenia: DISC1 mouse models  

Microsoft Academic Search

Disrupted in Schizophrenia-1 (DISC1) is one of the most likely susceptibility genes for schizophrenia (SZ). DISC1 is being established as a hub protein with various functions in the pre- and postnatal development of the nervous system. Since generation of a knockout (KO) mouse has proved challenging, various alternative approaches have been taken. Seven DISC1 mouse models have been described to

Hanna Jaaro-Peled

2009-01-01

107

Metallothionein prolongs survival and antagonizes senescence-associated cardiomyocyte diastolic dysfunction: role of oxidative stress.  

PubMed

Senescence is accompanied by oxidative stress and cardiac dysfunction, although the link between the two remains unclear. This study examined the role of antioxidant metallothionein on cardiomyocyte function, superoxide generation, the oxidative stress biomarker aconitase activity, cytochrome c release, and expression of oxidative stress-related proteins, such as the GTPase RhoA and NADPH oxidase protein p47phox in young (5-6 mo) and aged (26-28 mo) FVB wild-type (WT) and cardiac-specific metallothionein transgenic mice. Metallothionein mice showed a longer life span (by approximately 4 mo) than FVB mice evaluated by the Kaplan-Meier survival curve. Compared with young cardiomyocytes, aged myocytes displayed prolonged TR(90), reduced tolerance to high stimulus frequency, and slowed intracellular Ca2+ decay, all of which were nullified by metallothionein. Aging increased superoxide generation, active RhoA abundance, cytochrome c release, and p47phox expression and suppressed aconitase activity without affecting protein nitrotyrosine formation in the hearts. These aging-induced changes in oxidative stress and related protein biomarkers were attenuated by metallothionein. Aged metallothionein mouse myocytes were more resistant to the superoxide donor pyrogallol-induced superoxide generation and apoptosis. In addition, aging-associated prolongation in TR90 was blunted by the Rho kinase inhibitor Y-27632. Collectively, our data demonstrated that metallothionein may alleviate aging-induced cardiac contractile defects and oxidative stress, which may contribute to prolonged life span in metallothionein transgenic mice. PMID:16585059

Yang, Xiaoping; Doser, Thomas A; Fang, Cindy X; Nunn, Jennifer M; Janardhanan, Rajiv; Zhu, Meijun; Sreejayan, Nair; Quinn, Mark T; Ren, Jun

2006-04-03

108

Overlapping genes in the human and mouse genomes  

Microsoft Academic Search

BACKGROUND: Increasing evidence suggests that overlapping genes are much more common in eukaryotic genomes than previously thought. In this study we identified and characterized the overlapping genes in a set of 13,484 pairs of human-mouse orthologous genes. RESULTS: About 10% of the genes under study are overlapping genes, the majority of which are different-strand overlaps. The majority of the same-strand

Chaitanya R Sanna; Wen-Hsiung Li; Liqing Zhang

2008-01-01

109

Metallothionein mRNA expression in mice homozygous for chromosomal deletions around the albino locus.  

PubMed

Deletions in chromosome 7 of the mouse affect the expression of the metallothionein gene Mt-1, which maps on chromosome 8, and steady-state levels of Mt-1 mRNA are reduced to 15-40% of normal in livers of newborn mice homozygous for either the c3H or c14CoS deletion. Glucocorticoids fail to induce hepatic Mt-1 mRNA levels in deletion homozygotes in contrast to normal littermates. However, zinc chloride is effective in inducing Mt-1 mRNA levels in livers of deletion homozygotes as well as of their normal littermates. Other tissues (e.g., kidney and intestine) of deletion homozygotes express basal levels of Mt-1 mRNA higher than those of normal littermates. In the intestine these are furthermore inducible by both hormonal and metal agents. Thus, loss of inducibility of the Mt-1 gene in deletion homozygotes concerns glucocorticoids only and is furthermore restricted to specific cell types (i.e., hepatocytes). The trans-acting factor(s) normally encoded in the deleted region of chromosome 7 appears to be instrumental in conferring on the metallothionein gene in hepatocytes the essential competence to respond to hormonal inducing signals. PMID:3422486

DeFranco, D; Morris, S M; Leonard, C M; Gluecksohn-Waelsch, S

1988-02-01

110

Recommended nomenclature for five mammalian carboxylesterase gene families: human, mouse, and rat genes and proteins  

PubMed Central

Mammalian carboxylesterase (CES or Ces) genes encode enzymes that participate in xenobiotic, drug, and lipid metabolism in the body and are members of at least five gene families. Tandem duplications have added more genes for some families, particularly for mouse and rat genomes, which has caused confusion in naming rodent Ces genes. This article describes a new nomenclature system for human, mouse, and rat carboxylesterase genes that identifies homolog gene families and allocates a unique name for each gene. The guidelines of human, mouse, and rat gene nomenclature committees were followed and “CES” (human) and “Ces” (mouse and rat) root symbols were used followed by the family number (e.g., human CES1). Where multiple genes were identified for a family or where a clash occurred with an existing gene name, a letter was added (e.g., human CES4A; mouse and rat Ces1a) that reflected gene relatedness among rodent species (e.g., mouse and rat Ces1a). Pseudogenes were named by adding “P” and a number to the human gene name (e.g., human CES1P1) or by using a new letter followed by ps for mouse and rat Ces pseudogenes (e.g., Ces2d-ps). Gene transcript isoforms were named by adding the GenBank accession ID to the gene symbol (e.g., human CES1_AB119995 or mouse Ces1e_BC019208). This nomenclature improves our understanding of human, mouse, and rat CES/Ces gene families and facilitates research into the structure, function, and evolution of these gene families. It also serves as a model for naming CES genes from other mammalian species.

Holmes, Roger S.; Wright, Matthew W.; Laulederkind, Stanley J. F.; Cox, Laura A.; Hosokawa, Masakiyo; Imai, Teruko; Ishibashi, Shun; Lehner, Richard; Miyazaki, Masao; Perkins, Everett J.; Potter, Phillip M.; Redinbo, Matthew R.; Robert, Jacques; Satoh, Tetsuo; Yamashita, Tetsuro; Yan, Bingfan; Yokoi, Tsuyoshi; Zechner, Rudolf; Maltais, Lois J.

2011-01-01

111

Improved human disease candidate gene prioritization using mouse phenotype  

PubMed Central

Background The majority of common diseases are multi-factorial and modified by genetically and mechanistically complex polygenic interactions and environmental factors. High-throughput genome-wide studies like linkage analysis and gene expression profiling, tend to be most useful for classification and characterization but do not provide sufficient information to identify or prioritize specific disease causal genes. Results Extending on an earlier hypothesis that the majority of genes that impact or cause disease share membership in any of several functional relationships we, for the first time, show the utility of mouse phenotype data in human disease gene prioritization. We study the effect of different data integration methods, and based on the validation studies, we show that our approach, ToppGene , outperforms two of the existing candidate gene prioritization methods, SUSPECTS and ENDEAVOUR. Conclusion The incorporation of phenotype information for mouse orthologs of human genes greatly improves the human disease candidate gene analysis and prioritization.

Chen, Jing; Xu, Huan; Aronow, Bruce J; Jegga, Anil G

2007-01-01

112

Web-based digital gene expression atlases for the mouse.  

PubMed

Over the past 15 years the publicly available mouse gene expression data determined by in situ hybridization have dramatically increased in scope and spatiotemporal resolution. As a consequence of resources and tools available in the post-genomic era, full transcriptomes in the mouse brain and in the mouse embryo can be studied. Here we introduce and discuss seven current databases (MAMEP, EMBRYS, GenePaint, EURExpress, EuReGene, BGEM, and GENSAT) that grant access to large collections of expression data in mouse. We review the experimental focus, coverage, data assessment, and annotation for each of these databases and the implementation of analytic tools and links to other relevant databases. We provide a user-oriented summary of how to interrogate each database. PMID:22936000

Geffers, Lars; Herrmann, Bernhard; Eichele, Gregor

2012-08-31

113

Structure of the differentially expressed mouse U3A gene.  

PubMed

Two markedly different forms of U3 RNA are present in mouse, the relative abundance of which largely depends upon the tissues. In all cases studied so far, the more abundant form is U3B, encoded by four previously characterized genes. We report here the isolation and analysis of the unique gene encoding the U3A variant, which completes the characterization of the mouse U3 multigene family. Comparisons with rat U3 genes indicate that the diversification of the A and B forms has predated the mouse/rat separation. The two forms of U3 RNA are submitted to similar, but not identical, primary and secondary structure constraints. As for the sequences flanking the RNA coding region, similar observations emerge for both types of genes: for each type, the 5' flanks are strongly conserved between mouse and rat, over at least the proximal 500 bp, whereas only about 30 bp of proximal 3' flanks are preserved, which include a signal for the formation of vertebrate U small nRNA 3' end. By contrast the 5' flanks of the two types of genes diverge extensively from each other, either in mouse or in rat, and could be involved in the differential expression of the two forms. Even over the few conserved motifs thought to be involved in the basic transcriptional control of vertebrate U small nRNA genes, the A and B forms of U3 genes exhibit specific differences maintained in the two rodent species. PMID:1576989

Mazan, S; Gulli, M P; Joseph, N; Bachellerie, J P

1992-05-01

114

RegionSpecific Expression of Two Mouse Homeo Box Genes  

Microsoft Academic Search

Mammalian homeo box genes have been identified on the basis of sequence homology to Drosophila homeotic and segmentation genes. These studies examine the distribution of transcripts from two mouse homeo box genes, Hox-2.1 and Hox-3.1, throughout the latter third of prenatal development. Transcripts from these genes are regionally localized along the rostro-caudal axis of the developing central nervous system, yielding

Manuel F. Utset; Alexander Awgulewitsch; Frank H. Ruddle; William McGinnis

1987-01-01

115

Cloning of the mouse steroid sulfatase (Sts) gene  

SciTech Connect

In humans, the STS gene is located on the distal short arm of the X chromosome, proximal to the pseudoautosomal region (PAR). STS activity can be detected in mouse tissues using the same substrates as for the human STS assay, and quantitative differences in STS levels among various mouse strains allowed the mapping of Sts to the PAR. However, several attempts to clone the mouse Sts gene using human reagents have failed, which has been taken as evidence of substantial divergence between these genes. We report the cloning of the mouse Sts gene by using the Sts cDNA from an intermediate species, the rat. The coding region of the rat Sts cDNA was used as a probe to screen mouse fibroblast and liver cDNA libraries, and 5 clones were isolated. DNA sequence of the 2.5 kb cDNA revealed 75% similarity with rat Sts, while it was only 63% and 60% similar to the human STS at the DNA and protein levels, respectively. Interestingly, the mouse Sts cDNA revealed a high GC content, including 225 CpG dinucleotides in the coding region, compared to 88 and 44 CpGs in the same regions of the rat and human STS genes, respectively. Despite the low degree of conservation between these genes, all the point mutations described so far in human STS-deficient patients occur at amino acid residues that are conserved between these three species. Using a panel of mouse-hamster somatic cell hybrids, the mouse Sts cDNA sequences were mapped to the mouse X and Y chromosomes, with restriction fragments of the same size for both chromosomes, consistent with localization of Sts in the PAR. The pseudoautosomal pattern of inheritance was ascertained in back-crosses between C3H/An and SW mice, making use of STS activity assays and RFLPs. RT-PCR experiments using cDNA from a panel of hamster-mouse somatic cell hybrids containing either the inactive or the active X chromosome indicated that the mouse Sts gene escapes X-inactivation, as expected for a pseudoautosomal gene.

Salido, E.C. [UCSF School Medicine, San Francisco, CA (United States)]|[Univ. La Laguna (Spain); Li, X.M.; Shapiro, L.J. [UCSF Sch. Medicine, San Francisco, CA (United States)] [and others

1994-09-01

116

Molecular control of copper homeostasis in filamentous fungi: increased expression of a metallothionein gene during aging of Podospora anserina  

Microsoft Academic Search

The lifespan of the ascomycete Podospora anserina was previously demonstrated to be significantly increased in a copper-uptake mutant, suggesting that copper is a potential stressor involved in degenerative processes. In order to determine whether changes in copper stress occur in the cells during normal aging of cultures, we cloned and characterized a gene coding for a component of the molecular

N. B. Averbeck; C. Borghouts; A. Hamann; V Specke; H.-D. Osiewacz

2001-01-01

117

Cloning, characterization and targeting of the mouse HEXA gene  

SciTech Connect

The HEXA gene, encoding the {alpha} subunit of {beta}-hexosaminidase A, is essential for the metabolism of ganglioside G{sub M2}, and defects in this gene cause Tay-Sachs disease in humans. To elucidate the role of the gene in the nervous system of the mouse and to establish a mouse model of Tay-Sachs disease, we have cloned and characterized the HEXA gene and targeted a disruption of the gene in mouse ES cells. The mouse HEXA gene spans {approximately}26 kb and consists of 14 exons, similar to the human gene. A heterogeneous transcription initiation site was identified 21-42 bp 5{prime} of the initiator ATG, with two of the sites fitting the consensus CTCA (A = start) as seen for some weak initiator systems. Promoter analysis showed that the first 150 bp 5{prime} of the ATG contained 85% of promoter activity observed in constructs containing up to 1050 bp of 5{prime} sequence. The active region contained a sequence matching that of the adenovirus major late promoter upstream element factor. A survey of mouse tissues showed that the highest mRNA levels were in (max to min): testis (5.5 x brain cortex), adrenal, epididymis, heart, brain, lung, kidney, and liver (0.3 x brain cortex). A 12 kb BstI/SalI fragment containing nine exons was disrupted with the insertion of the bacterial neo{sup r} gene in exon 11 and was targeted into 129/Sv ES cells by homologous recombination. Nine of 153 G418 resistant clones were correctly targeted as confirmed by Southern blotting. The heterozygous ES cells were microinjected into mouse blastocysts and implanted into pseudo-pregnant mice. Nine male chimeric mice, showing that 40-95% chimerism for the 129/Sv agouti coat color marker, are being bred in an effort to generate germline transmission of the disrupted HEXA gene.

Wakamatsu, N.; Trasler, J.M.; Gravel, R.A. [McGill Univ., Quebec (Canada)] [and others

1994-09-01

118

Mouse Lysozyme M Gene: Isolation, Characterization, and Expression Studies  

Microsoft Academic Search

We have isolated and characterized both cDNA and genomic DNA of the mouse lysozyme M gene. Derivation of the amino acid sequence from the nucleotide sequences revealed six positions in the carboxyl terminus that differ from partial sequences previously published. The differential detection of specific mRNAs from the closely related lysozyme M and P genes has revealed different but overlapping

Michael Cross; Inge Mangelsdorf; Angela Wedel; Rainer Renkawitz

1988-01-01

119

Fetal gene therapy of ?-thalassemia in a mouse model  

PubMed Central

Fetuses with homozygous ?-thalassemia usually die at the third trimester of pregnancy or soon after birth. Hence, the disease could potentially be a target for fetal gene therapy. We have previously established a mouse model of ?-thalassemia. These mice mimic the human ?-thalassemic conditions and can be used as preclinical models for fetal gene therapy. We tested a lentiviral vector containing the HS 2, 3, and 4 of the ?-LCR, a central polypurine tract element, and the ?-globin gene promoter directing either the EGFP or the human ?-globin gene. We showed that the GFP expression was erythroid-specific and detected in BFU-E colonies and the erythroid progenies of CFU-GEMM. For in utero gene delivery, we did yolk sac vessel injection at midgestation of mouse embryos. The recipient mice were analyzed after birth for human ?-globin gene expression. In the newborn, human ?-globin gene expression was detected in the liver, spleen, and peripheral blood. The human ?-globin gene expression was at the peak at 3–4 months, when it reached 20% in some recipients. However, the expression declined at 7 months. Colony-forming assays in these mice showed low abundance of the transduced human ?-globin gene in their BFU-E and CFU-GEMM and the lack of its transcript. Thus, lentiviral vectors can be an effective vehicle for delivering the human ?-globin gene into erythroid cells in utero, but, in the mouse model, delivery at late midgestation could not transduce hematopoietic stem cells adequately to sustain gene expression.

Han, Xiao-Dong; Lin, Chin; Chang, Judy; Sadelain, Michel; Kan, Y. W.

2007-01-01

120

The mouse (Mus musculus) T cell receptor beta variable (TRBV), diversity (TRBD) and joining (TRBJ) genes.  

PubMed

'The Mouse (Mus musculus) T cell Receptor Beta Variable (TRBV), Diversity (TRBD), and Joining (TRBJ) Genes', the 14th report of the 'IMGT Locus in Focus' section, comprises 8 tables entitled: (1) 'Number of mouse (Mus musculus) germline TRBV genes at 6A-C and potential repertoire'; (2) 'Mouse (Mus musculus) germline TRBV genes at 6A-C'; (3) 'Mouse (Mus musculus) TRBV allele table'; (4) 'Mouse (Mus musculus) germline TRBD genes and alleles'; (5) 'Mouse (Mus musculus) germline TRBJ genes'; (6) 'Mouse (Mus musculus) TRBJ allele table'; (7) 'Correspondence between the different mouse (Mus musculus) TRBV gene nomenclatures'; (8) 'Mouse (Mus musculus) TRBV genes and related human TRBV genes'. These tables are available at the IMGT Marie-Paule page from IMGT, the international ImMunoGeneTics database (http://imgt.cines.fr:8104) created by Marie-Paule Lefranc, Université Montpellier II, CNRS, Montpellier, France. PMID:11096260

Bosc, N; Lefranc, M P

2000-01-01

121

Effects of light on the accumulation of abscisic acid and expression of an early cysteine-labeled metallothionein gene in microspores of Triticum aestivum during induced embryogenic development  

Microsoft Academic Search

A cloned cDNA to the wheat (Triticum aestivum) early cysteine-labeled metallothionein has many characteristics of a molecular marker for pollen embryogenesis in this plant. This transcript was not detected in uninucleate microspores at the time of culture or in pollen at any stage during normal ontogeny; its mRNA did begin to increase in embryogenic microspores within 6 h of culture,

T. L. Reynolds; R. L. Crawford

1997-01-01

122

Tissue and cell-specific expression of metallothionein genes in cadmium- and copper-exposed mussels analyzed by in situ hybridization and RT–PCR  

Microsoft Academic Search

Metallothioneins (MTs) are metal-inducible proteins that can be used as biomarkers of metal exposure. In mussels two families of MT isoforms (MT10 and MT20) have been characterized. In this study, mussels (Mytilus galloprovincialis) were exposed to 200 ppb Cd and 40 ppb Cu for 2 and 9 days to characterize the tissue and isoform specificity of metal-induced MT expression. Non-radioactive in situ hybridization

I. Zorita; E. Bilbao; A. Schad; I. Cancio; M. Soto; M. P.. Cajaraville

2007-01-01

123

Mouse Myocilin ( Myoc) Gene Expression in Ocular Tissues 1  

Microsoft Academic Search

Human myocilin is identical to TIGR (trabecular meshwork inducible glucocorticoid response) which is responsible for the pathogenesis of juvenile-onset primary open angle glaucoma (GLC1A). We have isolated cDNA for mouse myocilin (Myoc) and investigated mouse myocilin gene expression in ocular tissues within situRNA hybridization. Hybridization signals were observed in the iris, ciliary body, trabecular meshwork, sclera, and retina in the

Hiroki Takahashi; Setsuko Noda; Yutaka Imamura; Akemi Nagasawa; Ryo Kubota; Yukihiko Mashima; Jun Kudoh; Yoshihisa Oguchi; Nobuyoshi Shimizu

1998-01-01

124

Monitoring metal ion flux in reactions of metallothionein and drug-modified metallothionein by electrospray mass spectrometry.  

PubMed Central

The capabilities of electrospray ionization mass spectrometry are demonstrated for monitoring the flux of metal ions out of and into the metalloprotein rabbit liver metallothionein and, in one example, chlorambucil-alkylated metallothionein. Metal ion transfers may be followed as the reactions proceed in situ to provide kinetic information. More uniquely to this technique, metal ion stoichiometries may be determined for reaction intermediates and products. Partners used in these studies include EDTA, carbonic anhydrase, a zinc-bound hexamer of insulin, and the core domain of bacteriophage T4 gene 32 protein, a binding protein for single-stranded DNA.

Zaia, J.; Fabris, D.; Wei, D.; Karpel, R. L.; Fenselau, C.

1998-01-01

125

Estrogen-Dependent Gene Expression in the Mouse Ovary  

PubMed Central

Estrogen (E) plays a pivotal role in regulating the female reproductive system, particularly the ovary. However, the number and type of ovarian genes influenced by estrogen remain to be fully elucidated. In this study, we have utilized wild-type (WT) and aromatase knockout (ArKO; estrogen free) mouse ovaries as an in vivo model to profile estrogen dependent genes. RNA from each individual ovary (n?=?3) was analyzed by a microarray-based screen using Illumina Sentrix Mouse WG-6 BeadChip (45,281 transcripts). Comparative analysis (GeneSpring) showed differential expression profiles of 450 genes influenced by E, with 291 genes up-regulated and 159 down-regulated by 2-fold or greater in the ArKO ovary compared to WT. Genes previously reported to be E regulated in ArKO ovaries were confirmed, in addition to novel genes not previously reported to be expressed or regulated by E in the ovary. Of genes involved in 5 diverse functional processes (hormonal processes, reproduction, sex differentiation and determination, apoptosis and cellular processes) 78 had estrogen-responsive elements (ERE). These analyses define the transcriptome regulated by E in the mouse ovary. Further analysis and investigation will increase our knowledge pertaining to how E influences follicular development and other ovarian functions.

Liew, Seng H.; Sarraj, Mai A.; Drummond, Ann E.; Findlay, Jock K.

2011-01-01

126

Clustering of cytokine genes on mouse chromosome 11  

PubMed Central

The presence of positionally conserved amino acid residues suggests that the mouse proteins TCA3, P500, MIP1-alpha, MIP1-beta, and JE are members of a single gene family. These proteins are activation specific and can be expressed by both myeloid and lymphoid cells. MIP1- alpha/MIP1-beta and MCAF (the putative human homologue of JE) act as chemotactic and activating agents for neutrophils and macrophages, respectively. The functions of TCA3 and P500 are unknown. We have used interspecies somatic cell hybrids and recombinant inbred mouse strains to show that the genes encoding TCA3, MIP1-alpha, MIP1-beta, and JE (provisionally termed Tca3, Mip-1a, Mip-1b, and Sigje, respectively) map as a cluster on the distal portion of mouse chromosome 11 near the Hox-2 gene complex. DNA sequence analysis indicates that the P500 and TCA3 proteins are encoded by alternative splicing products of one genomic gene. Additionally, the genes encoding TCA3 and JE are found to be strikingly similar with respect to the positions of intron-exon boundaries. Together, these data support the model that the cytokines TCA3, P500, MIP1-alpha, MIP1-beta, and JE are encoded by a single cluster of related genes. The gene encoding IL-5 (Il-5), which acts as a T cell-replacing factor, a B cell growth factor, and an eosinophil differentiation factor, is also mapped to mouse chromosome 11.Il-5 maps approximately 25 cM proximal to the Tca-3 gene and appears tightly linked to a previously described gene cluster that includes Il-3, Il-4, and Csfgm. We discuss the potential relevance of the two cytokine gene clusters described here with particular attention to specific human hematologic malignancies associated with chromosomal aberrations at corresponding locations on human chromosomes 5 and 17.

1990-01-01

127

Conservation of Regional Gene Expression in Mouse and Human Brain  

PubMed Central

Many neurodegenerative diseases have a hallmark regional and cellular pathology. Gene expression analysis of healthy tissues may provide clues to the differences that distinguish resistant and sensitive tissues and cell types. Comparative analysis of gene expression in healthy mouse and human brain provides a framework to explore the ability of mice to model diseases of the human brain. It may also aid in understanding brain evolution and the basis for higher order cognitive abilities. Here we compare gene expression profiles of human motor cortex, caudate nucleus, and cerebellum to one another and identify genes that are more highly expressed in one region relative to another. We separately perform identical analysis on corresponding brain regions from mice. Within each species, we find that the different brain regions have distinctly different expression profiles. Contrasting between the two species shows that regionally enriched genes in one species are generally regionally enriched genes in the other species. Thus, even when considering thousands of genes, the expression ratios in two regions from one species are significantly correlated with expression ratios in the other species. Finally, genes whose expression is higher in one area of the brain relative to the other areas, in other words genes with patterned expression, tend to have greater conservation of nucleotide sequence than more widely expressed genes. Together these observations suggest that region-specific genes have been conserved in the mammalian brain at both the sequence and gene expression levels. Given the general similarity between patterns of gene expression in healthy human and mouse brains, we believe it is reasonable to expect a high degree of concordance between microarray phenotypes of human neurodegenerative diseases and their mouse models. Finally, these data on very divergent species provide context for studies in more closely related species that address questions such as the origins of cognitive differences.

Strand, Andrew D; Aragaki, Aaron K; Baquet, Zachary C; Hodges, Angela; Cunningham, Philip; Holmans, Peter; Jones, Kevin R; Jones, Lesley; Kooperberg, Charles; Olson, James M

2007-01-01

128

Gene structure of human and mouse methylenetetrahydrofolate reductase (MTHFR)  

PubMed

Methylenetetrahydrofolate reductase (MTHFR) catalyzes the conversion of 5,10-methylenetetrahydrofolate to 5-methyltetrahydrofolate, a co-substrate for homocysteine remethylation to methionine. A human cDNA for MTHFR, 2.2 kb in length, has been expressed and shown to result in a catalytically active enzyme of approximately 70 kDa. Fifteen mutations have been identified in the MTHFR gene: 14 rare mutations associated with severe enzymatic deficiency and 1 common variant associated with a milder deficiency. The common polymorphism has been implicated in three multifactorial diseases: occlusive vascular disease, neural tube defects, and colon cancer. The human gene has been mapped to chromosomal region 1p36.3 while the mouse gene has been localized to distal Chromosome (Chr) 4. Here we report the isolation and characterization of the human and mouse genes for MTHFR. A human genomic clone (17 kb) was found to contain the entire cDNA sequence of 2.2 kb; there were 11 exons ranging in size from 102 bp to 432 bp. Intron sizes ranged from 250 bp to 1.5 kb with one exception of 4.2 kb. The mouse genomic clones (19 kb) start 7 kb 5' exon 1 and extend to the end of the coding sequence. The mouse amino acid sequence is approximately 90% identical to the corresponding human sequence. The exon sizes, locations of intronic boundaries, and intron sizes are also quite similar between the two species. The availability of human genomic clones has been useful in designing primers for exon amplification and mutation detection. The mouse genomic clones will be helpful in designing constructs for gene targeting and generation of mouse models for MTHFR deficiency. PMID:9680386

Goyette, P; Pai, A; Milos, R; Frosst, P; Tran, P; Chen, Z; Chan, M; Rozen, R

1998-08-01

129

Role of metallothionein in murine experimental colitis.  

PubMed

Metallothioneins (MTs) are a family of cysteine-rich low molecular-weight proteins that can act as reactive oxygen species scavengers. Although it is known that the induction of MT expression suppresses various inflammatory disorders, the role of MTs in intestinal inflammation remains unclear. In this study, we investigated the effects of dextran sulfate sodium (DSS) administration in mice with targeted deletions of the MT-I/II genes. Acute colitis was induced by 2% DSS in male MT-I/II double knockout (MT-null) and C57BL/6 (wild-type) mice. The disease activity index (DAI) was determined on a daily basis for each animal, and consisted of a calculated score based on changes in body weight, stool consistency and intestinal bleeding. Histology, colon length, myeloperoxidase (MPO) activity and colonic mRNA expression and the concentration of inflammatory cytokines were evaluated by real-time-PCR and enzyme-linked immunosorbent assay (ELISA). The localization of MTs and macrophages was determined by immunohistological and immunofluorescence staining. To investigate the role of MTs in macrophages, peritoneal macrophages were isolated and their responses to lipopolysaccharide were measured. Following DSS administration, the DAI score increased in a time-dependent manner and was significantly enhanced in the MT-I/II knockout mice. Colonic MPO activity levels and inflammatory cytokines [tumor necrosis factor (TNF)-?, interferon (IFN)-? and interleukin (IL)-17] production increased following DSS administration, and these increases were significantly enhanced in the MT-I/II knockout mice compared with the wild-type mice. MT-positive cells were detected in the lamina propria and submucosal layer by immunohistochemical and immunofluorescence staining, and were mainly co-localized in F4/80-positive macrophages. The production of inflammatory cytokines (TNF-?, IFN-? and IL-17) from isolated peritoneal macrophages increased following lipopolysaccharide stimulation, and these increases were significantly enhanced in the macrophages obtained from the MT-I/II knockout mice. These data indicate that MTs play an important role in the prevention of colonic mucosal inflammation in a mouse model of DSS-induced colitis, thus suggesting that endogenous MTs play a protective role against intestinal inflammation. PMID:23467591

Tsuji, Toshifumi; Naito, Yuji; Takagi, Tomohisa; Kugai, Munehiro; Yoriki, Hiroyuki; Horie, Ryusuke; Fukui, Akifumi; Mizushima, Katsura; Hirai, Yasuko; Katada, Kazuhiro; Kamada, Kazuhiro; Uchiyama, Kazuhiko; Handa, Osamu; Konishi, Hideyuki; Yagi, Nobuaki; Ichikawa, Hiroshi; Yanagisawa, Rie; Suzuki, Junko S; Takano, Hirohisa; Satoh, Masahiko; Yoshikawa, Toshikazu

2013-03-06

130

Inducible and reversible regulation of endogenous gene in mouse  

PubMed Central

Methods for generating loss-of-function mutations, such as conventional or conditional gene knockout, are widely used in deciphering gene function in vivo. By contrast, inducible and reversible regulation of endogenous gene expression has not been well established. Using a mouse model, we demonstrate that a chimeric transcriptional repressor molecule (tTS) can reversibly inhibit the expression of an endogenous gene, Nmyc. In this system, a tetracycline response element (TRE) artificially inserted near the target gene’s promoter region turns the gene on and off in a tetracycline-inducible manner. NmycTRE mice were generated by inserting a TRE into the first intron of Nmyc by the knockin technique. NmycTRE mice were crossed to tTS transgenic mice to produce NmycTRE/TRE: tTS embryos. In these embryos, tTS blocked Nmyc expression, and embryonic lethality was observed at E11.5d. When the dam was exposed to drinking water containing doxycycline (dox), normal endogenous Nmyc expression was rescued, and the embryo survived to birth. This novel genetic modification strategy based on the tTS–dox system for inducible and reversible regulation of endogenous mouse genes will be a powerful tool to investigate target genes that cause embryonic lethality or other defects where reversible regulation or temporary shutdown of the target gene is needed.

Sun, Ruilin; Zhao, Kai; Shen, Ruling; Cai, Lei; Yang, Xingyu; Kuang, Ying; Mao, Jifang; Huang, Fang; Wang, Zhugang; Fei, Jian

2012-01-01

131

Bi-allelic gene targeting in mouse embryonic stem cells  

PubMed Central

The EUCOMM and KOMP programs have generated targeted conditional alleles in mouse embryonic stem cells for nearly 10,000 genes. The availability of these stem cell resources will greatly accelerate the functional analysis of genes in mice and in cultured cells. We present a method for conditional ablation of genes in ES cells using vectors and targeted clones from the EUCOMM and KOMP conditional resources. Inducible homozygous cells described here provide a precisely controlled experimental system to study gene function in a model cell.

Tate, Peri H.; Skarnes, William C.

2013-01-01

132

Recent segmental and gene duplications in the mouse genome  

PubMed Central

Background The high quality of the mouse genome draft sequence and its associated annotations are an invaluable biological resource. Identifying recent duplications in the mouse genome, especially in regions containing genes, may highlight important events in recent murine evolution. In addition, detecting recent sequence duplications can reveal potentially problematic regions of the genome assembly. We use BLAST-based computational heuristics to identify large (? 5 kb) and recent (? 90% sequence identity) segmental duplications in the mouse genome sequence. Here we present a database of recently duplicated regions of the mouse genome found in the mouse genome sequencing consortium (MGSC) February 2002 and February 2003 assemblies. Results We determined that 33.6 Mb of 2,695 Mb (1.2%) of sequence from the February 2003 mouse genome sequence assembly is involved in recent segmental duplications, which is less than that observed in the human genome (around 3.5-5%). From this dataset, 8.9 Mb (26%) of the duplication content consisted of 'unmapped' chromosome sequence. Moreover, we suspect that an additional 18.5 Mb of sequence is involved in duplication artifacts arising from sequence misassignment errors in this genome assembly. By searching for genes that are located within these regions, we identified 675 genes that mapped to duplicated regions of the mouse genome. Sixteen of these genes appear to have been duplicated independently in the human genome. From our dataset we further characterized a 42 kb recent segmental duplication of Mater, a maternal-effect gene essential for embryogenesis in mice. Conclusion Our results provide an initial analysis of the recently duplicated sequence and gene content of the mouse genome. Many of these duplicated loci, as well as regions identified to be involved in potential sequence misassignment errors, will require further mapping and sequencing to achieve accuracy. A Genome Browser database was set up to display the identified duplication content presented in this work. This data will also be relevant to the growing number of investigators who use the draft genome sequence for experimental design and analysis.

Cheung, Joseph; Wilson, Michael D; Zhang, Junjun; Khaja, Razi; MacDonald, Jeffrey R; Heng, Henry HQ; Koop, Ben F; Scherer, Stephen W

2003-01-01

133

The mouse Engrailed genes: A window into autism  

Microsoft Academic Search

The complex behavioral symptoms and neuroanatomical abnormalities observed in autistic individuals strongly suggest a multi-factorial basis for this perplexing disease. Although not the perfect model, we believe the Engrailed genes provide an invaluable “window” into the elusive etiology of autism spectrum disorder. The Engrailed-2 gene has been associated with autism in genetic linkage studies. The En2 knock-out mouse harbors cerebellar

Barbara Kuemerle; Forrest Gulden; Natalie Cherosky; Elizabeth Williams; Karl Herrup

2007-01-01

134

Characterization of the mouse Myoc\\/Tigr gene  

Microsoft Academic Search

Mutations in the myocilin (MYOC), also known as Trabecular meshwork-Inducible Glucocorticoid Response (TIGR) gene can lead to juvenile open-angle glaucoma in human and may be responsible for at least 3% of primary open-angle glaucoma. To develop a mouse model of primary open angle glaucoma, and to get deeper insight into the mechanisms of the MYOC\\/TIGR gene regulation and function, we

S I Tomarev; E R Tamm; B Chang

1998-01-01

135

Gene function in mouse embryogenesis: get set for gastrulation  

Microsoft Academic Search

During early mouse embryogenesis, temporal and spatial regulation of gene expression and cell signalling influences lineage specification, embryonic polarity, the patterning of tissue progenitors and the morphogenetic movement of cells and tissues. Uniquely in mammals, the extraembryonic tissues are the source of signals for lineage specification and tissue patterning. Here we discuss recent discoveries about the lead up to gastrulation,

David A. F. Loebel; Patrick P. L. Tam

2007-01-01

136

Interrogating Mouse Mammary Cancer Models: Insights from Gene Expression Profiling  

Microsoft Academic Search

Numerous mouse models for mammary cancer have been developed and characterized based upon their biological, molecular, and histopathological features. In an effort to dissect the molecular anatomy of such models and compare their gene expression profiles to those of human breast cancer, six models representing various oncogenic pathways have been investigated using cDNA microarray technology. Results of these analyses are

Antonio A. Fargiano; Kartiki V. Desai; Jeffrey E. Green

2003-01-01

137

Direct Gene Transfer into Mouse Muscle in Vivo  

Microsoft Academic Search

RNA and DNA expression vectors containing genes for chloramphenicol acetyltransferase, luciferase, and beta-galactosidase were separately injected into mouse skeletal muscle in vivo. Protein expression was readily detected in all cases, and no special delivery system was required for these effects. The extent of expression from both the RNA and DNA constructs was comparable to that obtained from fibroblasts transfected in

Jon A. Wolff; Robert W. Malone; Phillip Williams; Wang Chong; Gyula Acsadi; Agnes Jani; Philip L. Felgner

1990-01-01

138

Inducible and reversible regulation of endogenous gene in mouse.  

PubMed

Methods for generating loss-of-function mutations, such as conventional or conditional gene knockout, are widely used in deciphering gene function in vivo. By contrast, inducible and reversible regulation of endogenous gene expression has not been well established. Using a mouse model, we demonstrate that a chimeric transcriptional repressor molecule (tTS) can reversibly inhibit the expression of an endogenous gene, Nmyc. In this system, a tetracycline response element (TRE) artificially inserted near the target gene's promoter region turns the gene on and off in a tetracycline-inducible manner. Nmyc(TRE) mice were generated by inserting a TRE into the first intron of Nmyc by the knockin technique. Nmyc(TRE) mice were crossed to tTS transgenic mice to produce Nmyc(TRE/TRE): tTS embryos. In these embryos, tTS blocked Nmyc expression, and embryonic lethality was observed at E11.5d. When the dam was exposed to drinking water containing doxycycline (dox), normal endogenous Nmyc expression was rescued, and the embryo survived to birth. This novel genetic modification strategy based on the tTS-dox system for inducible and reversible regulation of endogenous mouse genes will be a powerful tool to investigate target genes that cause embryonic lethality or other defects where reversible regulation or temporary shutdown of the target gene is needed. PMID:22879379

Sun, Ruilin; Zhao, Kai; Shen, Ruling; Cai, Lei; Yang, Xingyu; Kuang, Ying; Mao, Jifang; Huang, Fang; Wang, Zhugang; Fei, Jian

2012-08-08

139

Isolation of genes identified in mouse renal proximal tubule by comparing different gene expression profiles  

Microsoft Academic Search

Isolation of genes identified in mouse renal proximal tubule by comparing different gene expression profiles. An expression profile is a list based on a large scale sequencing of 1000 cDNA clones, showing the expressed genes and the abundance of their transcripts in a given cell or tissue (Okubo K et al: Nature Genet 2:173, 1992). We constructed an expression profile

Masaru Takenaka; Enyu Imai; Tetsuya Kaneko; Takahito Ito; Toshiki Moriyama; Atsushi Yamauchi; Masatsugu Hori; Shoko Kawamoto; Kousaku Okubo

1998-01-01

140

Expression of the mouse a1(ll) collagen gene is not restricted to cartilage during development  

Microsoft Academic Search

Summary The mouse «1(II) collagen gene has been isolated and a 5' portion of the gene which has low homology to other collagen genes was used to study the pattern of expression during mouse embryogenesis. In situ hybrid- ization studies show that in the mouse, like the chick, «1(TI) collagen is expressed hi chondrogenic tissues hi advance of chondrocyte differentiation.

KATHRYN S. E. CHEAH; ELIZABETH T. LAU; PATRICK K. C. AU; PATRICK P. L. TAM

1991-01-01

141

The functional landscape of mouse gene expression  

Microsoft Academic Search

ABSTRACT: BACKGROUND: Large-scale quantitative analysis of transcriptional co-expression has been used to dissect regulatory networks and to predict the functions of new genes discovered by genome sequencing in model organisms such as yeast. Although the idea that tissue-specific expression is indicative of gene function in mammals is widely accepted, it has not been objectively tested nor compared with the related

Wen Zhang; Quaid D Morris; Richard Chang; Ofer Shai; Malina A Bakowski; Nicholas Mitsakakis; Naveed Mohammad; Mark D Robinson; Ralph Zirngibl; Eszter Somogyi; Nancy Laurin; Eftekhar Eftekharpour; Eric Sat; Jörg Grigull; Qun Pan; Wen-Tao Peng; Nevan Krogan; Jack Greenblatt; Michael Fehlings; Derek van der Kooy; Jane Aubin; Benoit G Bruneau; Janet Rossant; Benjamin J Blencowe; Brendan J Frey; Timothy R Hughes

2004-01-01

142

The mouse forkhead gene Foxp2 modulates expression of the lung genes  

Microsoft Academic Search

AimsFoxp2 is expressed in the lung during mouse development. A monoclonal anti-mouse Foxp2 antibody was created to determine the expression pattern in the developing lung. Next, transcriptional control of two lung genes, CC10 and surfactant protein C (SPC) genes, by Foxp2 was investigated in H441 and A549 cells. Thirdly, expression patterns of Foxp2 and Foxf2 were compared in the developing

Zhi Yang; Keisuke Hikosaka; Mohammad T. K. Sharkar; Tomoki Tamakoshi; Abhishek Chandra; Bo Wang; Tatsuo Itakura; XiaoDong Xue; Tadayoshi Uezato; Wataru Kimura; Naoyuki Miura

2010-01-01

143

Zeptomole Electrochemical Detection of Metallothioneins  

PubMed Central

Background Thiol-rich peptides and proteins possess a large number of biological activities and may serve as markers for numerous health problems including cancer. Metallothionein (MT), a small molecular mass protein rich in cysteine, may be considered as one of the promising tumour markers. The aim of this paper was to employ chronopotentiometric stripping analysis (CPSA) for highly sensitive detection of MT. Methodology/Principal Findings In this study, we used adsorptive transfer stripping technique coupled with CPSA for detection of cysteine, glutathione oxidized and reduced, phytochelatin, bovine serum albumin, and metallothionein. Under the optimal conditions, we were able to estimate detection limits down to tens of fg per ml. Further, this method was applied to detect metallothioneins in blood serum obtained from patients with breast cancer and in neuroblastoma cells resistant and sensitive to cisplatin in order to show the possible role of metallothioneins in carcinogenesis. It was found that MT level in blood serum was almost twice higher as compared to the level determined in healthy individuals. Conclusions/Significance This paper brings unique results on the application of ultra-sensitive electroanalytical method for metallothionein detection. The detection limit and other analytical parameters are the best among the parameters of other techniques. In spite of the fact that the paper is mainly focused on metallothionein, it is worth mentioning that successful detection of other biologically important molecules is possible by this method. Coupling of this method with simple isolation methods such as antibody-modified paramagnetic particles may be implemented to lab–on-chip instrument.

Adam, Vojtech; Petrlova, Jitka; Wang, Joseph; Eckschlager, Tomas; Trnkova, Libuse; Kizek, Rene

2010-01-01

144

Cellular functions of genetically imprinted genes in human and mouse as annotated in the gene ontology.  

PubMed

By analyzing the cellular functions of genetically imprinted genes as annotated in the Gene Ontology for human and mouse, we found that imprinted genes are often involved in developmental, transport and regulatory processes. In the human, paternally expressed genes are enriched in GO terms related to the development of organs and of anatomical structures. In the mouse, maternally expressed genes regulate cation transport as well as G-protein signaling processes. Furthermore, we investigated if imprinted genes are regulated by common transcription factors. We identified 25 TF families that showed an enrichment of binding sites in the set of imprinted genes in human and 40 TF families in mouse. In general, maternally and paternally expressed genes are not regulated by different transcription factors. The genes Nnat, Klf14, Blcap, Gnas and Ube3a contribute most to the enrichment of TF families. In the mouse, genes that are maternally expressed in placenta are enriched for AP1 binding sites. In the human, we found that these genes possessed binding sites for both, AP1 and SP1. PMID:23226257

Hamed, Mohamed; Ismael, Siba; Paulsen, Martina; Helms, Volkhard

2012-11-30

145

Cellular Functions of Genetically Imprinted Genes in Human and Mouse as Annotated in the Gene Ontology  

PubMed Central

By analyzing the cellular functions of genetically imprinted genes as annotated in the Gene Ontology for human and mouse, we found that imprinted genes are often involved in developmental, transport and regulatory processes. In the human, paternally expressed genes are enriched in GO terms related to the development of organs and of anatomical structures. In the mouse, maternally expressed genes regulate cation transport as well as G-protein signaling processes. Furthermore, we investigated if imprinted genes are regulated by common transcription factors. We identified 25 TF families that showed an enrichment of binding sites in the set of imprinted genes in human and 40 TF families in mouse. In general, maternally and paternally expressed genes are not regulated by different transcription factors. The genes Nnat, Klf14, Blcap, Gnas and Ube3a contribute most to the enrichment of TF families. In the mouse, genes that are maternally expressed in placenta are enriched for AP1 binding sites. In the human, we found that these genes possessed binding sites for both, AP1 and SP1.

Hamed, Mohamed; Ismael, Siba; Paulsen, Martina; Helms, Volkhard

2012-01-01

146

Jackson Laboratory - Mouse Genome Informatics: The Gene Expression Database  

NSDL National Science Digital Library

A very unique biomedical research institution, "The Jackson Laboratory, a non-profit institution, is the world's largest mammalian genetic research facility." As such, Jackson provides universities and hospitals worldwide with millions of mice -- representing more than 2,500 varieties -- each year. This website offering from Jackson Laboratory, located in Bar Harbor, Maine, allows visitors to solicit valuable information on the mouse genome. "The Gene Expression Database (GXD) is a community resource for gene expression information from the laboratory mouse. GXD stores and integrates different types of expression data and makes these data freely available in formats appropriate for comprehensive analysis." At the site, visitors can learn about how to acquire data and search for via the Gene Expression Query Forms. Also of interest are the sections devoted to Who's Who in GXD and links to Selected Publications.

147

Mammalian MT1 and MT2 metallothioneins differ in their metal binding abilities.  

PubMed

Metallothioneins (MTs) constitute a universal family of polymorphic, ubiquitous small Cys-rich metal-binding polypeptides that in mammals are represented by four highly similar isoforms (MT1 to MT4). MT1 and MT2 have generally been considered as equivalent proteins, so that they are commonly referred to as MT1/MT2. However, transcription data have suggested a differential behavior for both gene products. In the present study, the metal binding abilities of mouse MT2 (mMT2) with divalent (Zn(ii) and Cd(ii)) and monovalent (Cu(i)) ions were analyzed and compared to those of the mouse MT1 (mMT1) isoform, previously determined using the same methodological approach. The comprehensive consideration of all the results obtained in this work experimentally demonstrates that the mMT2 isoform exhibits metal ion binding abilities distinct from those of mMT1, with a clear preference for Zn(ii) coordination, if compared to Cu(i) or even to Cd(ii). This is in full agreement with the gene expression regulation pattern for the MT1 and MT2 genes, as well as with the hypothesized preferential role of mMT2 in Zn(ii) homeostasis mechanisms, while MT1, possibly differentiated from a most recent duplication event in the mammalian MT gene cluster, would have evolved to detoxify Cd(ii), and probably other divalent metal ions. PMID:23925449

Artells, Ester; Palacios, Oscar; Capdevila, Mercè; Atrian, Sílvia

2013-09-25

148

Cadmium in metallothioneins.  

PubMed

Metallothioneins (MTs) are low-molecular-mass cysteine-rich proteins with the ability to bind mono- and divalent metal ions with the electron configuration d ( 10 ) in form of metal-thiolate clusters. MTs are thought, among others, to play a role in the homeostasis of essential Zn(II) and Cu(I) ions. Besides these metal ions also Cd(II) can be bound to certain MTs in vivo, giving rise to the perception that another physiological role of MTs is in the detoxification of heavy metal ions. Substitution of the spectroscopically silent Zn(II) ions in metalloproteins by Cd(II) proved to be an indispensable tool to probe the Zn(II) sites in vitro. In this review, methods applied in the studies of structural and chemical properties of Cd-MTs are presented. The first section focuses on the physical basis of spectroscopic techniques such as electronic absorption, circular dichroism (CD), magnetic CD, X-ray absorption, and perturbed angular correlation of ?-rays spectroscopy, as well as mass spectrometry, and their applications to Cd-MTs from different organisms. The following is devoted to the discussion of metal binding affinities of Cd-MTs, cluster dynamics, the reactivity of bound Cd(II) ions with metal ion chelators and of thiolate ligands with alkylating and oxidizing agents. Finally, a brief summary of the known three-dimensional structures of Cd-MTs, determined almost exclusively by multinuclear NMR techniques, is presented. Besides Cd-MTs, the described methods can also be applied to the study of metal binding sites in other metalloproteins. PMID:23430778

Freisinger, Eva; Vašák, Milan

2013-01-01

149

Structure and transcription of the mouse erythropoietin receptor gene.  

PubMed

The complete gene encoding the mouse erythropoietin receptor was isolated by using a cDNA probe derived from a mouse erythroleukemia (MEL) cell library. The gene spans approximately 5 kilobases and is present in a single copy per haploid genome. It contains eight exons, and the nucleotide sequence of the coding region from the genomic DNA is identical to the sequence of one of the MEL cDNA clones except for a single amino acid substitution (Leu----Val) at codon 163. There is a cluster of three major transcriptional start sites approximately 150 nucleotides upstream of the initiator ATG codon which is conserved in erythropoietin-dependent and -independent erythroleukemic cells, in MEL cells at different stages of differentiation, and in normal bone marrow cells. The promoter region contains a potential binding site for Sp1, erythroid-specific transcription factor GF-1, and several CACCC boxes, but not typical TATA or CAAT sequences. A fusion gene containing 452 nucleotides of 5' noncoding sequence linked to a promoterless human growth hormone gene directed the transcription of the latter in MEL cells but not in mouse fibroblasts, T cells, B cells, or macrophagelike cells, suggesting that this promoter functions in an erythroid-specific manner. PMID:2162479

Youssoufian, H; Zon, L I; Orkin, S H; D'Andrea, A D; Lodish, H F

1990-07-01

150

Conditional gene expression in the mouse using a Sleeping Beauty gene-trap transposon  

PubMed Central

Background Insertional mutagenesis techniques with transposable elements have been popular among geneticists studying model organisms from E. coli to Drosophila and, more recently, the mouse. One such element is the Sleeping Beauty (SB) transposon that has been shown in several studies to be an effective insertional mutagen in the mouse germline. SB transposon vector studies have employed different functional elements and reporter molecules to disrupt and report the expression of endogenous mouse genes. We sought to generate a transposon system that would be capable of reporting the expression pattern of a mouse gene while allowing for conditional expression of a gene of interest in a tissue- or temporal-specific pattern. Results Here we report the systematic development and testing of a transposon-based gene-trap system incorporating the doxycycline-repressible Tet-Off (tTA) system that is capable of activating the expression of genes under control of a Tet response element (TRE) promoter. We demonstrate that the gene trap system is fully functional in vitro by introducing the "gene-trap tTA" vector into human cells by transposition and identifying clones that activate expression of a TRE-luciferase transgene in a doxycycline-dependent manner. In transgenic mice, we mobilize gene-trap tTA vectors, discover parameters that can affect germline mobilization rates, and identify candidate gene insertions to demonstrate the in vivo functionality of the vector system. We further demonstrate that the gene-trap can act as a reporter of endogenous gene expression and it can be coupled with bioluminescent imaging to identify genes with tissue-specific expression patterns. Conclusion Akin to the GAL4/UAS system used in the fly, we have made progress developing a tool for mutating and revealing the expression of mouse genes by generating the tTA transactivator in the presence of a secondary TRE-regulated reporter molecule. A vector like the gene-trap tTA could provide a means for both annotating mouse genes and creating a resource of mice that express a regulable transcription factor in temporally- and tissue-specific patterns for conditional gene expression studies. These mice would be a valuable resource to the mouse genetics community for purpose of dissecting mammalian gene function.

Geurts, Aron M; Wilber, Andrew; Carlson, Corey M; Lobitz, Paul D; Clark, Karl J; Hackett, Perry B; McIvor, R Scott; Largaespada, David A

2006-01-01

151

Isolation and chromosomal mapping of a mouse homolog of the Batten disease gene CLN3  

SciTech Connect

We describe the isolation and chromosomal mapping of a mouse homology of the Batten disease gene, CLN3. Like its human counterpart, the mouse cDNA contains an open reading frame of 1314 bp encoding a predicted protein product of 438 amino acids. The mouse and human coding regions are 82 and 85% identical at the nucleic acid and amino acid levels, and respectively. The mouse gene maps to distal Chromosome 7, in a region containing genes whose homologs are on human chromosome 16p12, where CLN3 maps. Isolation of a mouse CLN3 homolog will facilitate the creation of a mouse model of Batten disease. 8 refs., 2 figs.

Lee, R.L. [Massachusetts General Hospital, Charlestown, MA (United States); Johnson, K.R. [Jackson Lab., Bar Harbor, ME (United States); Lerner, T.J. [Massachusetts General Hospital, Charlestown, MA (United States)]|[Harvard Mecical School, Boston, MA (United States)

1996-08-01

152

The mouse Engrailed genes: a window into Autism  

PubMed Central

The complex behavioral symptoms and neuroanatomical abnormalities observed in autistic individuals strongly suggest a multi-factorial basis for this perplexing disease. Although not the perfect model, we believe the Engrailed genes provide an invaluable “window” into the elusive etiology of Autism Spectrum Disorder. The Engrailed-2 gene has been associated with autism in genetic linkage studies. The En2 knock-out mouse harbors cerebellar abnormalities that are similar to those found in autistic individuals and, as we report here, has a distinct anterior shift in the position of the amygdala in the cerebral cortex. Our initial analysis of background effects in the En1 mouse knock-out provides insight as to possible molecular mechanisms and gender differences associated with autism. These findings further the connection between Engrailed and autism and provide new avenues to explore in the ongoing study of the biological basis of this multifaceted disease.

Kuemerle, Barbara; Gulden, Forrest; Cherosky, Natalie; Williams, Elizabeth; Herrup, Karl

2009-01-01

153

The mouse Engrailed genes: a window into autism.  

PubMed

The complex behavioral symptoms and neuroanatomical abnormalities observed in autistic individuals strongly suggest a multi-factorial basis for this perplexing disease. Although not the perfect model, we believe the Engrailed genes provide an invaluable "window" into the elusive etiology of autism spectrum disorder. The Engrailed-2 gene has been associated with autism in genetic linkage studies. The En2 knock-out mouse harbors cerebellar abnormalities that are similar to those found in autistic individuals and, as we report here, has a distinct anterior shift in the position of the amygdala in the cerebral cortex. Our initial analysis of background effects in the En1 mouse knock-out provides insight as to possible molecular mechanisms and gender differences associated with autism. These findings further the connection between Engrailed and autism and provide new avenues to explore in the ongoing study of the biological basis of this multifaceted disease. PMID:17055592

Kuemerle, Barbara; Gulden, Forrest; Cherosky, Natalie; Williams, Elizabeth; Herrup, Karl

2006-10-20

154

Characterization of the mouse protoporphyrinogen oxidase gene.  

PubMed

The murine protoporphyrinogen oxidase gene has been isolated, characterized and localized. The gene spans 4.2 kb, is comprised of 13 exons and 12 introns, and is located on chromosome 1 in band 1 H2. Analysis of 1.2 kb of the 5' upstream region revealed a promoter which is not GC rich and lacks any TATA boxes or initiator elements in the vicinity of the transcription start site. A variety of putative transcriptional element binding sequences were identified and gel shift assays support the presence of two GATA-1 sites near -760 bp as well as AP-1, AP-2, and Sp1 sites in the -1200 bp 5' flanking region. Luciferase reporter constructs transiently expressed in erythroid cell lines demonstrated erythroid-specific expression with the -1160 bp, but not with the -746 bp or -198 bp constructs. Expression in nonerythroid cells occurred maximally with -1160 bp, but was significant with -746 bp and absent with -198 bp. Expression of both housekeeping and erythroid-specific fusions in the transient expression systems was greatly decreased in the -5000 bp constructs suggesting the presence of repressor elements in the -1160 to -5000 bp region. PMID:11929049

Dailey, Tamara A; McManus, Julie F; Dailey, Harry A

2002-02-01

155

Complementation of H-2Linked Ir Genes in the Mouse  

Microsoft Academic Search

The immune response to the random linear terpolymer of L-glutamic acid, L-lysine, and L-phenylalanine (GLphi ) is under dominant H-2-linked Ir gene control in the mouse. Matings between two nonresponder strains produced responder F1 hybrids, demonstrating complementation of the nonresponder alleles. This observation, coupled with the fact that several intra H-2 recombinant strains derived by recombination between two nonresponder parental

Martin E. Dorf; Baruj Benacerraf

1975-01-01

156

Characterization of the Mouse Myoc\\/ TigrGene  

Microsoft Academic Search

Mutations in the myocilin (MYOC), also known as Trabecular meshwork-Inducible Glucocorticoid Response (TIGR) gene can lead to juvenile open-angle glaucoma in human and may be responsible for at least 3% of primary open-angle glaucoma. To develop a mouse model of primary open angle glaucoma, and to get deeper insight into the mechanisms of theMYOC\\/TIGRgene regulation and function, we have isolated

Stanislav I. Tomarev; Ernst R. Tamm; Bo Chang

1998-01-01

157

Brain Gene Expression of a Sporadic (icv-STZ Mouse) and a Familial Mouse Model (3xTg-AD Mouse) of Alzheimer's Disease  

PubMed Central

Alzheimer’s disease (AD) can be divided into sporadic AD (SAD) and familial AD (FAD). Most AD cases are sporadic and may result from multiple etiologic factors, including environmental, genetic and metabolic factors, whereas FAD is caused by mutations of presenilins or amyloid-? (A?) precursor protein (APP). A commonly used mouse model for AD is 3xTg-AD mouse, which is generated by over-expression of mutated presenilin 1, APP and tau in the brain and thus represents a mouse model of FAD. A mouse model generated by intracerebroventricular (icv) administration of streptozocin (STZ), icv-STZ mouse, shows many aspects of SAD. Despite the wide use of these two models for AD research, differences in gene expression between them are not known. Here, we compared the expression of 84 AD-related genes in the hippocampus and the cerebral cortex between icv-STZ mice and 3xTg-AD mice using a custom-designed qPCR array. These genes are involved in APP processing, tau/cytoskeleton, synapse function, apoptosis and autophagy, AD-related protein kinases, glucose metabolism, insulin signaling, and mTOR pathway. We found altered expression of around 20 genes in both mouse models, which affected each of above categories. Many of these gene alterations were consistent with what was observed in AD brain previously. The expression of most of these altered genes was decreased or tended to be decreased in the hippocampus of both mouse models. Significant diversity in gene expression was found in the cerebral cortex between these two AD mouse models. More genes related to synaptic function were dysregulated in the 3xTg-AD mice, whereas more genes related to insulin signaling and glucose metabolism were down-regulated in the icv-STZ mice. The present study provides important fundamental knowledge of these two AD mouse models and will help guide future studies using these two mouse models for the development of AD drugs.

Liang, Zhihou; Sun, Shenggang; Dai, Chun-ling; Lee, Moon H.; LaFerla, Frank M.; Grundke-Iqbal, Inge; Iqbal, Khalid; Liu, Fei; Gong, Cheng-Xin

2012-01-01

158

Functional and evolutionary analyses on expressed intronless genes in the mouse genome  

SciTech Connect

Using computational approaches we have identified 2017 expressed intronless genes in the mouse genome. Evolutionary analysis reveals that 56 intronless genes are conserved among the three domains of life - bacteria, archea and eukaryotes. These highly conserved intronless genes were found to be involved in essential housekeeping functions. About 80% of expressed mouse intronless genes have orthologs in eukaryotic genomes only, and thus are specific to eukaryotic organisms. 608 of these genes have intronless human orthologs and 302 of these orthologs have a match in OMIM database. Investigation into these mouse genes will be important in generating mouse models for understanding human diseases.

Sakharkar, K R [National University of Singapore; Sakharkar, M K [National University of Singapore; Culiat, Cymbeline T [ORNL; Chow, V T K [National University of Singapore; Pervaiz, S [National University of Singapore

2006-01-01

159

Identification of novel mouse genes conferring posthypoxic pauses  

PubMed Central

Although central to the susceptibility of adult diseases characterized by abnormal rhythmogenesis, characterizing the genes involved is a challenge. We took advantage of the C57BL/6J (B6) trait of hypoxia-induced periodic breathing and its absence in the C57BL/6J-Chr 1A/J/NaJ chromosome substitution strain to test the feasibility of gene discovery for this abnormality. Beginning with a genetic and phenotypic analysis of an intercross study between these strains, we discovered three quantitative trait loci (QTLs) on mouse chromosome 1, with phenotypic effects. Fine-mapping reduced the genomic intervals and gene content, and the introgression of one QTL region back onto the C57BL/6J-Chr 1A/J/NaJ restored the trait. mRNA expression of non-synonymous genes in the introgressed region in the medulla and pons found evidence for differential expression of three genes, the highest of which was apolipoprotein A2, a lipase regulator; the apo a2 peptide fragment (THEQLTPLVR), highly expressed in the liver, was expressed in low amounts in the medulla but did not correlate with trait expression. This work directly demonstrates the impact of elements on mouse chromosome 1 in respiratory rhythmogenesis.

Gillombardo, C. Barton; Yamauchi, Motoo; Adams, Mark D.; Dostal, Jesse; Chai, Sam; Moore, Michael W.; Donovan, Lucas M.; Han, Fang

2012-01-01

160

Genetic mapping of tumor susceptibility genes involved in mouse plasmacytomagenesis  

SciTech Connect

Plasmacytomas (PCTs) were induced in 47% of BALB/cAnPt mice by the intraperitoneal injection of pristane, in 2% of (BALB/c [times] DBA/2N)F[sub 1], and in 11% of 773 BALB/cAnPt [times] (BALB/cAnPt [times] DBA/2N)F[sub 1]N[sub 2] backcross mice. This result indicates a multigenic mode of inheritance for PCT susceptibility. To locate genes controlling this complex genetic trait, tumor susceptibility in backcross progeny generated from BALB/c and DBA/2N (resistant) mice was correlated with alleles of 83 marker loci. The genotypes of the PCT-susceptible progeny displayed an excess homozygosity for BALB/c alleles with a 32-centimorgan stretch of mouse chromosome 4 (>95% probability of linkage) with minimal recombination (12%) near Gt10. Another susceptibility gene on mouse chromosome 1 may be linked to Fcgr2 (90% probability of linkage); there were excess heterozygotes for Fcgr2 among the susceptible progeny and excess homozygotes among the resistant progeny. Regions of mouse chromosomes 4 and 1 that are correlated with PCT susceptibility share extensive linkage homology with regions of human chromosome 1 that have been associated with cytogenetic abnormalities in multiple myeloma and lymphoid, breast, and endocrine tumors. 68 refs., 2 figs., 1 tab.

Mock, B.A.; Krall, M.M.; Dosik, J.K. (National Institutes of Health, Bethesda, MD (United States))

1993-10-15

161

METALLOTHIONEIN: An Intracellular Protein to Protect Against Cadmium Toxicity  

Microsoft Academic Search

Metallothioneins (MT) are low-molecular-weight, cysteine-rich, metal-binding proteins. MT genes are readily induced by various physiologic and toxicologic stimuli. Because the cysteines in MT are absolutely conserved across species, it was suspected that the cysteines are necessary for function and MT is essential for life. In attempts to determine the function(s) of MT, studies have been performed using four different experimental

Curtis D. Klaassen; Jie Liu; Supratim Choudhuri

1999-01-01

162

Clustered metallothionein genes are co-regulated in rice and ectopic expression of OsMT1e-P confers multiple abiotic stress tolerance in tobacco via ROS scavenging  

PubMed Central

Background Metallothioneins (MT) are low molecular weight, cysteine rich metal binding proteins, found across genera and species, but their function(s) in abiotic stress tolerance are not well documented. Results We have characterized a rice MT gene, OsMT1e-P, isolated from a subtractive library generated from a stressed salinity tolerant rice genotype, Pokkali. Bioinformatics analysis of the rice genome sequence revealed that this gene belongs to a multigenic family, which consists of 13 genes with 15 protein products. OsMT1e-P is located on chromosome XI, away from the majority of other type I genes that are clustered on chromosome XII. Various members of this MT gene cluster showed a tight co-regulation pattern under several abiotic stresses. Sequence analysis revealed the presence of conserved cysteine residues in OsMT1e-P protein. Salinity stress was found to regulate the transcript abundance of OsMT1e-P in a developmental and organ specific manner. Using transgenic approach, we found a positive correlation between ectopic expression of OsMT1e-P and stress tolerance. Our experiments further suggest ROS scavenging to be the possible mechanism for multiple stress tolerance conferred by OsMT1e-P. Conclusion We present an overview of MTs, describing their gene structure, genome localization and expression patterns under salinity and development in rice. We have found that ectopic expression of OsMT1e-P enhances tolerance towards multiple abiotic stresses in transgenic tobacco and the resultant plants could survive and set viable seeds under saline conditions. Taken together, the experiments presented here have indicated that ectopic expression of OsMT1e-P protects against oxidative stress primarily through efficient scavenging of reactive oxygen species.

2012-01-01

163

Housekeeping and tissue-specific genes in mouse tissues  

PubMed Central

Background This study aims to characterize the housekeeping and tissue-specific genes in 15 mouse tissues by using the serial analysis of gene expression (SAGE) strategy which indicates the relative level of expression for each transcript matched to the tag. Results Here, we identified constantly expressed housekeeping genes, such as eukaryotic translation elongation factor 2, which is expressed in all tissues without significant difference in expression levels. Moreover, most of these genes were not regulated by experimental conditions such as steroid hormones, adrenalectomy and gonadectomy. In addition, we report previously postulated housekeeping genes such as peptidyl-prolyl cis-trans isomerase A, glyceraldehyde-3-phosphate dehydrogenase and beta-actin, which are expressed in all the tissues, but with significant difference in their expression levels. We have also identified genes uniquely detected in each of the 15 tissues and other tissues from public databases. Conclusion These identified housekeeping genes could represent appropriate controls for RT-PCR and northern blot when comparing the expression levels of genes in several tissues. The results reveal several tissue-specific genes highly expressed in testis and pituitary gland. Furthermore, the main function of tissue-specific genes expressed in liver, lung and bone is the cell defence, whereas several keratins involved in cell structure function are exclusively detected in skin and vagina. The results from this study can be used for example to target a tissue for agent delivering by using the promoter of tissue-specific genes. Moreover, this study could be used as basis for further researches on physiology and pathology of these tissues.

Kouadjo, Kouame E; Nishida, Yuichiro; Cadrin-Girard, Jean F; Yoshioka, Mayumi; St-Amand, Jonny

2007-01-01

164

Epigenetic interplay between mouse endogenous retroviruses and host genes  

PubMed Central

Background Transposable elements are often the targets of repressive epigenetic modifications such as DNA methylation that, in theory, have the potential to spread toward nearby genes and induce epigenetic silencing. To better understand the role of DNA methylation in the relationship between transposable elements and genes, we assessed the methylation state of mouse endogenous retroviruses (ERVs) located near genes. Results We found that ERVs of the ETn/MusD family show decreased DNA methylation when near transcription start sites in tissues where the nearby gene is expressed. ERVs belonging to the IAP family, however, are generally heavily methylated, regardless of the genomic environment and the tissue studied. Furthermore, we found full-length ETn and IAP copies that display differential DNA methylation between their two long terminal repeats (LTRs), suggesting that the environment surrounding gene promoters can prevent methylation of the nearby LTR. Spreading from methylated ERV copies to nearby genes was rarely observed, with the regions between the ERVs and genes apparently acting as a boundary, enriched in H3K4me3 and CTCF, which possibly protects the unmethylated gene promoter. Furthermore, the flanking regions of unmethylated ERV copies harbor H3K4me3, consistent with spreading of euchromatin from the host gene toward ERV insertions. Conclusions We have shown that spreading of DNA methylation from ERV copies toward active gene promoters is rare. We provide evidence that genes can be protected from ERV-induced heterochromatin spreading by either blocking the invasion of repressive marks or by spreading euchromatin toward the ERV copy.

2012-01-01

165

Adult mouse brain gene expression patterns bear an embryologic imprint  

PubMed Central

The current model to explain the organization of the mammalian nervous system is based on studies of anatomy, embryology, and evolution. To further investigate the molecular organization of the adult mammalian brain, we have built a gene expression-based brain map. We measured gene expression patterns for 24 neural tissues covering the mouse central nervous system and found, surprisingly, that the adult brain bears a transcriptional “imprint” consistent with both embryological origins and classic evolutionary relationships. Embryonic cellular position along the anterior–posterior axis of the neural tube was shown to be closely associated with, and possibly a determinant of, the gene expression patterns in adult structures. We also observed a significant number of embryonic patterning and homeobox genes with region-specific expression in the adult nervous system. The relationships between global expression patterns for different anatomical regions and the nature of the observed region-specific genes suggest that the adult brain retains a degree of overall gene expression established during embryogenesis that is important for regional specificity and the functional relationships between regions in the adult. The complete collection of extensively annotated gene expression data along with data mining and visualization tools have been made available on a publicly accessible web site (www.barlow-lockhart-brainmapnimhgrant.org).

Zapala, Matthew A.; Hovatta, Iiris; Ellison, Julie A.; Wodicka, Lisa; Del Rio, Jo A.; Tennant, Richard; Tynan, Wendy; Broide, Ron S.; Helton, Rob; Stoveken, Barbara S.; Winrow, Christopher; Lockhart, Daniel J.; Reilly, John F.; Young, Warren G.; Bloom, Floyd E.; Lockhart, David J.; Barlow, Carrolee

2005-01-01

166

Differential Expression of the Two Nonallelic Proinsulin Genes in the Developing Mouse Embryo  

Microsoft Academic Search

In the mouse, insulin is produced from two similar but nonallelic genes that encode proinsulins I and II. We have investigated expression of these two genes during mouse embryonic development, using a PCR to detect the two gene transcripts and immunocytochemistry to visualize the two corresponding proteins. At appearance of the dorsal pancreatic anlage at day 9.5 of gestation, both

Louise Deltour; Patrick Leduque; Niels Blume; Ole Madsen; Paul Dubois; Jacques Jami; Danielle Bucchini

1993-01-01

167

tRNA genes protect a reporter gene from epigenetic silencing in mouse cells  

PubMed Central

It is a well-established fact that the tRNA genes in yeast can function as chromatin barrier elements. However, so far there is no experimental evidence that tRNA and other Pol III-transcribed genes exhibit barrier activity in mammals. This study utilizes a recently developed reporter gene assay to test a set of Pol III-transcribed genes and gene clusters with variable promoter and intergenic regions for their ability to prevent heterochromatin-mediated reporter gene silencing in mouse cells. The results show that functional copies of mouse tRNA genes are effective barrier elements. The number of tRNA genes as well as their orientation influence barrier function. Furthermore, the DNA sequence composition of intervening and flanking regions affects barrier activity of tRNA genes. Barrier activity was maintained for much longer time when the intervening and flanking regions of tRNA genes were replaced by AT-rich sequences, suggesting a negative role of DNA methylation in the establishment of a functional barrier. Thus, our results suggest that tRNA genes are essential elements in establishment and maintenance of chromatin domain architecture in mammalian cells.

Ebersole, Thomas; Kim, Jung-Hyun; Samoshkin, Alexander; Kouprina, Natalay; Pavlicek, Adam; White, Robert J

2011-01-01

168

A mutation in the enamelin gene in a mouse model.  

PubMed

Amelogenesis imperfecta is an inherited disorder affecting tooth enamel formation. We previously isolated a mouse strain with an amelogenesis imperfecta phenotype (ATE1 mice) from a dominant ethylnitrosourea screen and mapped the disease-causing defect to a 9-cM region of mouse chromosome 5. In the current study, we tested the hypothesis that there is a mutation in enamelin (ENAM) or ameloblastin (AMBN), both of which are located within the linkage region, by sequencing these two candidate genes. Analysis of our data shows that the amelogenesis imperfecta phenotype is linked to a C > T transition in exon 8 of the enamelin gene. The mutation predicts a C826T transition, which is present in the enamelin transcript and changes the glutamine (Gln) codon at position 176 into a premature stop codon (Gln176X). Conversely, no mutation could be detected in the ameloblastin gene. These results define the ATE1 mice as a model for local hypoplastic autosomal-dominant amelogenesis imperfecta (AIH2), which is caused by enamelin truncation mutations in humans. PMID:17652207

Seedorf, H; Klaften, M; Eke, F; Fuchs, H; Seedorf, U; Hrabe de Angelis, M

2007-08-01

169

Specialization of Gene Expression during Mouse Brain Development  

PubMed Central

The transcriptome of the brain changes during development, reflecting processes that determine functional specialization of brain regions. We analyzed gene expression, measured using in situ hybridization across the full developing mouse brain, to quantify functional specialization of brain regions. Surprisingly, we found that during the time that the brain becomes anatomically regionalized in early development, transcription specialization actually decreases reaching a low, “neurotypic”, point around birth. This decrease of specialization is brain-wide, and mainly due to biological processes involved in constructing brain circuitry. Regional specialization rises again during post-natal development. This effect is largely due to specialization of plasticity and neural activity processes. Post-natal specialization is particularly significant in the cerebellum, whose expression signature becomes increasingly different from other brain regions. When comparing mouse and human expression patterns, the cerebellar post-natal specialization is also observed in human, but the regionalization of expression in the human Thalamus and Cortex follows a strikingly different profile than in mouse.

Liscovitch, Noa; Chechik, Gal

2013-01-01

170

A Fungal Metallothionein Is Required for Pathogenicity of Magnaporthe grisea  

PubMed Central

The causal agent of rice blast disease, the ascomycete fungus Magnaporthe grisea, infects rice (Oryza sativa) plants by means of specialized infection structures called appressoria, which are formed on the leaf surface and mechanically rupture the cuticle. We have identified a gene, Magnaporthe metallothionein 1 (MMT1), which is highly expressed throughout growth and development by M. grisea and encodes an unusual 22–amino acid metallothionein-like protein containing only six Cys residues. The MMT1-encoded protein shows a very high affinity for zinc and can act as a powerful antioxidant. Targeted gene disruption of MMT1 produced mutants that show accelerated hyphal growth rates and poor sporulation but had no effect on metal tolerance. Mmt1 mutants are incapable of causing plant disease because of an inability to bring about appressorium-mediated cuticle penetration. Mmt1 appears to be distributed in the inner side of the cell wall of the fungus. These findings indicate that Mmt1-like metallothioneins may play a novel role in fungal cell wall biochemistry that is required for fungal virulence.

Tucker, Sara L.; Thornton, Christopher R.; Tasker, Karen; Jacob, Claus; Giles, Greg; Egan, Martin; Talbot, Nicholas J.

2004-01-01

171

Genetic Mapping of Four Mouse bHLH Genes Related to DrosophilaProneural Gene atonal  

Microsoft Academic Search

It has been shown that mammalian neurogenesis is partly controlled by multiple basic helix–loop–helix (bHLH) genes, as inDrosophila.Recently, mouse homologs ofDrosophila atonal,a proneural gene encoding a bHLH protein required for chordotonal organ and photoreceptor development, have been characterized to obtain further insights into the molecular nature of mammalian neurogenesis. Here, to assess their potential involvement in genetic neural disorders, we

Fumiaki Isaka; Chikara Shimizu; Shigetada Nakanishi; Ryoichiro Kageyama

1996-01-01

172

Identify lymphatic metastasis-associated genes in mouse hepatocarcinoma cell lines using gene chip  

Microsoft Academic Search

Abstract Abstract Abstract Abstract Abstract AIM: In order to obtain ,lymphogenous ,metastasis- associated genes, we compared the transcriptional profiles of mouse hepatocarcinoma,cell lines Hca-F with highly lymphatic,metastasis ,potential ,and ,Hca-P with low lymphatic metastasis potential. METHODS:T otal RNA was isolated from Hca-F and Hca-P

Bo Song; Jian-Wu Tang; Bo Wang; Xiao-Nan Cui; Lu Sun; Li-Min Mao; Chun-Hui Zhou; Yue Du; Li-Hui Wang; Hua-Xin Wang; Ren-Shu Zheng; Lei Sun

2005-01-01

173

Screening Helicobacter pylori genes induced during infection of mouse stomachs  

PubMed Central

AIM: To investigate the effect of in vivo environment on gene expression in Helicobacter pylori (H. pylori) as it relates to its survival in the host. METHODS: In vivo expression technology (IVET) systems are used to identify microbial virulence genes. We modified the IVET-transcriptional fusion vector, pIVET8, which uses antibiotic resistance as the basis for selection of candidate genes in host tissues to develop two unique IVET-promoter-screening vectors, pIVET11 and pIVET12. Our novel IVET systems were developed by the fusion of random Sau3A DNA fragments of H. pylori and a tandem-reporter system of chloramphenicol acetyltransferase and beta-galactosidase. Additionally, each vector contains a kanamycin resistance gene. We used a mouse macrophage cell line, RAW 264.7 and mice, as selective media to identify specific genes that H. pylori expresses in vivo. Gene expression studies were conducted by infecting RAW 264.7 cells with H. pylori. This was followed by real time polymerase chain reaction (PCR) analysis to determine the relative expression levels of in vivo induced genes. RESULTS: In this study, we have identified 31 in vivo induced (ivi) genes in the initial screens. These 31 genes belong to several functional gene families, including several well-known virulence factors that are expressed by the bacterium in infected mouse stomachs. Virulence factors, vacA and cagA, were found in this screen and are known to play important roles in H. pylori infection, colonization and pathogenesis. Their detection validates the efficacy of these screening systems. Some of the identified ivi genes have already been implicated to play an important role in the pathogenesis of H. pylori and other bacterial pathogens such as Escherichia coli and Vibrio cholerae. Transcription profiles of all ivi genes were confirmed by real time PCR analysis of H. pylori RNA isolated from H. pylori infected RAW 264.7 macrophages. We compared the expression profile of H. pylori and RAW 264.7 coculture with that of H. pylori only. Some genes such as cagA, vacA, lpxC, murI, tlpC, trxB, sodB, tnpB, pgi, rbfA and infB showed a 2-20 fold upregulation. Statistically significant upregulation was obtained for all the above mentioned genes (P < 0.05). tlpC, cagA, vacA, sodB, rbfA, infB, tnpB, lpxC and murI were also significantly upregulated (P < 0.01). These data suggest a strong correlation between results obtained in vitro in the macrophage cell line and in the intact animal. CONCLUSION: The positive identification of these genes demonstrates that our IVET systems are powerful tools for studying H. pylori gene expression in the host environment.

Singh, Aparna; Hodgson, Nathaniel; Yan, Ming; Joo, Jungsoo; Gu, Lei; Sang, Hong; Gregory-Bryson, Emmalena; Wood, William G; Ni, Yisheng; Smith, Kimberly; Jackson, Sharon H; Coleman, William G

2012-01-01

174

Viral Gene Transfer to Developing Mouse Salivary Glands  

PubMed Central

Branching morphogenesis is essential for the formation of salivary glands, kidneys, lungs, and many other organs during development, but the mechanisms underlying this process are not adequately understood. Microarray and other gene expression methods have been powerful approaches for identifying candidate genes that potentially regulate branching morphogenesis. However, functional validation of the proposed roles for these genes has been severely hampered by the absence of efficient techniques to genetically manipulate cells within embryonic organs. Using ex vivo cultured embryonic mouse submandibular glands (SMGs) as models to study branching morphogenesis, we have identified new vectors for viral gene transfer with high efficiency and cell-type specificity to developing SMGs. We screened adenovirus, lentivirus, and 11 types of adeno-associated viruses (AAV) for their ability to transduce embryonic day 12 or 13 SMGs. We identified two AAV types, AAV2 and bovine AAV (BAAV), that are selective in targeting expression differentially to SMG epithelial and mesenchymal cell populations, respectively. Transduction of SMG epithelia with self-complementary (sc) AAV2 expressing fibroblast growth factor 7 (Fgf7) supported gland survival and enhanced SMG branching morphogenesis. Our findings represent, to our knowledge, the first successful selective gene targeting to epithelial vs. mesenchymal cells in an organ undergoing branching morphogenesis.

Hsu, J.C.; Di Pasquale, G.; Harunaga, J.S.; Onodera, T.; Hoffman, M.P.; Chiorini, J.A.; Yamada, K.M.

2012-01-01

175

Trmt112 Gene Expression in Mouse Embryonic Development  

PubMed Central

Mouse Trmt112, the homologous gene of yeast Trm112 (tRNA methyltransferase 11-2), was initially cloned from RIKEN with uncertain function. The yeast TRM112 is now known to play important roles in RNA methylation. Here, we studied the expression of Trmt112 by in situ hybridization and quantitative real-time RT-PCR (QRT-PCR). A higher expression level of Trmt112 was observed in the brain and nervous system by whole mount in situ hybridization from embryonic day 10.5 (E10.5) to E11.5. At later developmental stages E13.5 and E16.5, abundant expression was prominently found in various organs and tissues including developing brain, nervous system, thymus, lung, liver, intestine, kidney, and cartilage. Furthermore, Trmt112 was persistently expressed from E9.5 to E18.5 on whole embryos and highly expressed in multiple organs at E12.5, E15.5 and E18.5 by QRT-PCR. These results showed that Trmt112 gene was highly and ubiquitously expressed during mouse embryonic development, implying that it might be involved in the morphogenesis of diverse organs and tissues and numerous physiological functions.

Gu, Tiantian; He, Hongjuan; Zhang, Yan; Han, Zhengbin; Hou, Guangyuan; Zeng, Tiebo; Liu, Qi; Wu, Qiong

2012-01-01

176

The mouse histone H1 genes: gene organization and differential regulation 1 1 Edited by K. Yamamoto  

Microsoft Academic Search

There are six mouse histone H1 genes present in the histone gene cluster on mouse chromosome 13. These genes encode five histone H1 variants expressed in somatic cells, H1a to H1e, and the testis-specific H1t histone. Two of the genes that have not been assigned previously to the five somatic H1 subtypes have been identified as encoding the H1b and

Zeng-Feng Wang; Allen M Sirotkin; Gregory M Buchold; Arthur I Skoultchi; William F Marzluff

1997-01-01

177

Region-specific gene expression in early postnatal mouse thalamus.  

PubMed

Previous studies in the developing mouse thalamus have demonstrated that regional identity is established during early stages of development (Suzuki-Hirano et al. J. Comp. Neurol. 2011;519:528-543). However, the developing thalamus often shows little resemblance to the anatomical organization of the postnatal thalamus, making it difficult to identify genes that might mediate the organization of thalamic nuclei. We therefore analyzed the expression pattern of genes that we have identified as showing regional expression in embryonic thalamus on postnatal days (P) 6-8 by using in situ hybridization. We also identified several genes expressed only in the postnatal thalamus with restricted expression in specific nuclei. We first demonstrated the selective expression of neurotransmitter-related genes (vGlut2, vGAT, D2R, and HTR2C), identifying the neurotransmitter subtypes of cells in this region, and we also demonstrated selective expression of additional genes in the thalamus (Steel, Slitrk6, and AI852580). In addition, we demonstrated expression of genes specific to somatosensory thalamic nuclei, the ventrobasal posterior nuclei (VP); a visual thalamic nucleus, the dorsal lateral geniculate nucleus (dLGN); and an auditory thalamic nucleus, the medial geniculate body (MGB) (p57Kip, Nr1d1, and GFR?1). We also identified genes that are selectively expressed in multiple different nuclei (Foxp2, Chst2, and EphA8). Finally, we demonstrated that several bone morphogenetic proteins (BMPs) and their inhibitors are expressed in the postnatal thalamus in a nucleus-specific fashion, suggesting that BMPs play roles in the postnatal thalamus unrelated to their known role in developmental patterning. Our findings provide important information for understanding the mechanisms of nuclear specification and connectivity during development, as well as their maintenance in adult thalamus. PMID:21192083

Yuge, Kazuya; Kataoka, Ayane; Yoshida, Aya C; Itoh, Daisuke; Aggarwal, Manisha; Mori, Susumu; Blackshaw, Seth; Shimogori, Tomomi

2011-02-15

178

Mouse genetics in the 21st century: using gene targeting to create a cornucopia of mouse mutants possessing precise genetic modifications  

Microsoft Academic Search

Over 1500 mouse mutants have been identified, but few of the genes responsible for the defects have been identified. Recent developments in the area of gene targeting are revolutionizing the field of mouse genetics and our understanding of numerous genes, including those thought to be involved in cell proliferation and differentiation. Gene targeting was developed as a method for producing

Phillip J. Wilder; Angie Rizzino

1993-01-01

179

The role of retrotransposons in gene family expansions: insights from the mouse Abp gene family  

PubMed Central

Background Retrotransposons have been suggested to provide a substrate for non-allelic homologous recombination (NAHR) and thereby promote gene family expansion. Their precise role, however, is controversial. Here we ask whether retrotransposons contributed to the recent expansions of the Androgen-binding protein (Abp) gene families that occurred independently in the mouse and rat genomes. Results Using dot plot analysis, we found that the most recent duplication in the Abp region of the mouse genome is flanked by L1Md_T elements. Analysis of the sequence of these elements revealed breakpoints that are the relicts of the recombination that caused the duplication, confirming that the duplication arose as a result of NAHR using L1 elements as substrates. L1 and ERVII retrotransposons are considerably denser in the Abp regions than in one Mb flanking regions, while other repeat types are depleted in the Abp regions compared to flanking regions. L1 retrotransposons preferentially accumulated in the Abp gene regions after lineage separation and roughly followed the pattern of Abp gene expansion. By contrast, the proportion of shared vs. lineage-specific ERVII repeats in the Abp region resembles the rest of the genome. Conclusions We confirmed the role of L1 repeats in Abp gene duplication with the identification of recombinant L1Md_T elements at the edges of the most recent mouse Abp gene duplication. High densities of L1 and ERVII repeats were found in the Abp gene region with abrupt transitions at the region boundaries, suggesting that their higher densities are tightly associated with Abp gene duplication. We observed that the major accumulation of L1 elements occurred after the split of the mouse and rat lineages and that there is a striking overlap between the timing of L1 accumulation and expansion of the Abp gene family in the mouse genome. Establishing a link between the accumulation of L1 elements and the expansion of the Abp gene family and identification of an NAHR-related breakpoint in the most recent duplication are the main contributions of our study.

2013-01-01

180

Characterization of the gene encoding mouse serum amyloid P component. Comparison with genes encoding other pentraxins.  

PubMed Central

A CBA/J-strain mouse serum amyloid P component (SAP) genomic clone was isolated and analysed. The clone contains the entire SAP gene and specifies a primary transcript of 1065 nucleotide residues. This comprises a first exon of 206 nucleotide residues containing the mRNA 5'-untranslated region and sequence encoding the pre-SAP leader peptide and the first two amino acid residues of mature SAP separated by a single 110-base intron from a 749-nucleotide-residue second exon containing sequence encoding the bulk of the mature SAP and specifying the mRNA 3'-untranslated region. The overall organization is similar to that of the human SAP gene, and the coding region and intron sequences are highly conserved. The SAP RNA cap site was defined by primer extension analysis of polyadenylated acute-phase liver RNA. The 5'-region of the mouse SAP gene contains modified CAAT and TATA promoter elements preceded by a putative hepatocyte-nuclear-factor-1-recognition site; these structures are in a region that is highly homologous to the corresponding region of the human SAP gene. Comparisons of the mouse SAP gene structure and derived amino acid sequence with those of other mammalian pentraxins were made. Images Fig. 3.

Whitehead, A S; Rits, M

1989-01-01

181

High-throughput trapping of secretory pathway genes in mouse embryonic stem cells  

Microsoft Academic Search

High-throughput gene trapping is a random approach for inducing insertional mutations across the mouse genome. This approach uses gene trap vectors that simultaneously inactivate and report the expression of the trapped gene at the insertion site, and provide a DNA tag for the rapid identification of the disrupted gene. Gene trapping has been used by both public and private institutions

Silke De-Zolt; Frank Schnutgen; Claudia Seisenberger; Jens Hansen; Melanie Hollatz; Thomas Floss; Patricia Ruiz; Wolfgang Wurst; Harald von Melchner

2006-01-01

182

Structure and polymorphism of the mouse prion protein gene.  

PubMed Central

Missense mutations in the prion protein (PrP) gene, overexpression of the cellular isoform of PrP (PrPC), and infection with prions containing the scrapie isoform of PrP (PrPSc) all cause neurodegenerative disease. To understand better the physiology and expression of PrPC, we retrieved mouse PrP gene (Prn-p) yeast artificial chromosome (YAC), cosmid, phage, and cDNA clones. Physical mapping positions Prn-p approximately 300 kb from ecotropic virus integration site number 4 (Evi-4), compatible with failure to detect recombination between Prn-p and Evi-4 in genetic crosses. The Prn-pa allele encompasses three exons, with exons 1 and 2 encoding the mRNA 5' untranslated region. Exon 2 has no equivalent in the Syrian hamster and human PrP genes. The Prn-pb gene shares this intron/exon structure but harbors an approximately 6-kb deletion within intron 2. While the Prn-pb open reading frame encodes two amino acid substitutions linked to prolonged scrapie incubation periods, a deletion of intron 2 sequences also characterizes inbred strains such as RIII/S and MOLF/Ei with shorter incubation periods, making a relationship between intron 2 size and scrapie pathogenesis unlikely. The promoter regions of a and b Prn-p alleles include consensus Sp1 and AP-1 sites, as well as other conserved motifs which may represent binding sites for as yet unidentified transcription factors. Images

Westaway, D; Cooper, C; Turner, S; Da Costa, M; Carlson, G A; Prusiner, S B

1994-01-01

183

Down-regulated genes in mouse dental papillae and pulp.  

PubMed

Important factors involved in odontogenesis in mouse dental papillae disappear between the pre- and post-natal stages of development. Therefore, we hypothesized that certain genes involved in odontogenesis in dental papillae were subject to pre-/post-natal down-regulation. Our goal was to identify, by microarray analysis, which genes were down-regulated. Dental papillae were isolated from embryonic 16-day-, 18-day- (E16, E18), and post-natal 3-day-old (P3) murine first mandibular molar germs and analyzed by microarray. The number of down-regulated genes was 2269 between E16 and E18, and 3130 between E18 and P3. Drastic down-regulation (fold change > 10.0) of Adamts4, Aldha1a2, and Lef1 was observed at both E16 and E18, and quantitative RT-PCR revealed a post-natal reduction in their expression (Adamts4, 1/3; Aldh1a2, 1/13; and Lef1, 1/37). These results suggest that down-regulation of these three genes is an important factor in normal odontogenesis in dental papillae. PMID:20448247

Sasaki, H; Muramatsu, T; Kwon, H-J; Yamamoto, H; Hashimoto, S; Jung, H-S; Shimono, M

2010-05-06

184

Engineering BAC reporter gene constructs for mouse transgenesis.  

PubMed

A culmination of large-scale ideas and efforts has truly allowed for the use of large genomic DNA clones housed in Bacterial Artificial Chromosome (BAC) vectors for biological research. Fundamental advances that have allowed this to happen include (1) the completion of genome sequencing projects and the establishment of highly annotated web-accessible databases allowing for the rapid identity and purchase of BAC clones containing genes of interest. (2) The generation of methodologies to modify BACs genetically, allowing for the rapid creation of gene targeting constructs or transgenic reporter gene constructs using homologous recombination in bacteria.Recent efforts on our part have capitalized on these advances by using BACs and bacterial recombination methods to generate fluorescent protein reporter transgenic mice to study skeletal biology. The rationale for using BAC genomic DNA clones to engineer reporter gene constructs is based on their much larger size, thus increasing the likelihood that most, if not all, of a gene's respective cis regulator elements are present, giving a truer representation of the endogenous gene's expression. In a relatively short amount of time, we have become extremely proficient at generating BAC reporters. Contrary to the widely perceived notion that working with BACs is complex and difficult, we decided to write this chapter to encourage laboratories that are currently using traditional molecular cloning methods to engineer transgenic DNA constructs to strongly consider learning BAC methodologies. As an example, we walk through the steps we took to generate the transgenic reporter mouse line, Tenascin C (TNC)-mCherry. PMID:21080280

Fu, Yu; Maye, Peter

2011-01-01

185

Metallothioneins Are Required for Formation of Cross-Adaptation Response to Neurobehavioral Toxicity from Lead and Mercury Exposure in Nematodes  

Microsoft Academic Search

Metallothioneins (MTs) are small, cysteine-rich polypeptides, but the role of MTs in inducing the formation of adaptive response is still largely unknown. We investigated the roles of metallothionein genes (mtl-1 and mtl-2) in the formation of cross-adaptation response to neurobehavioral toxicity from metal exposure in Caenorhabditis elegans. Pre-treatment with mild heat-shock at L2-larva stage effectively prevented the formation of the

Boping Ye; Qi Rui; Qiuli Wu; Dayong Wang; Baohong Zhang

2010-01-01

186

The mouse histone H1 genes: gene organization and differential regulation.  

PubMed

There are six mouse histone H1 genes present in the histone gene cluster on mouse chromosome 13. These genes encode five histone H1 variants expressed in somatic cells, H1a to H1e, and the testis-specific H1t histone. Two of the genes that have not been assigned previously to the five somatic H1 subtypes have been identified as encoding the H1b and H1d subtypes. Three of the H1 genes, H1a, H1c and H1t, are present on an 80 kb segment of DNA that contains nine core histone genes. Two others, H1d and H1e, are present in a second patch, while the H1b gene is at least 500 kb away in a patch containing 14 core histone genes. The histone H1 genes are differentially expressed. All five genes for the somatic histone H1 proteins are expressed in exponentially growing cells. However, the levels of H1a, H1b and H1d mRNAs are greatly reduced in cells that are terminally differentiated or arrested in G0, while the H1c and H1e mRNAs continue to be expressed. In addition to the major RNA that ends at the stem-loop, the H1c gene expresses a longer, polyadenylated mRNA in differentiated cells, although in varying amounts. None of the other histone H1 genes encodes detectable amounts of polyadenylated mRNAs. PMID:9300059

Wang, Z F; Sirotkin, A M; Buchold, G M; Skoultchi, A I; Marzluff, W F

1997-08-01

187

Integrative characterization of germ cell-specific genes from mouse spermatocyte UniGene library  

PubMed Central

Background The primary regulator of spermatogenesis, a highly ordered and tightly regulated developmental process, is an intrinsic genetic program involving male germ cell-specific genes. Results We analyzed the mouse spermatocyte UniGene library containing 2155 gene-oriented transcript clusters. We predict that 11% of these genes are testis-specific and systematically identified 24 authentic genes specifically and abundantly expressed in the testis via in silico and in vitro approaches. Northern blot analysis disclosed various transcript characteristics, such as expression level, size and the presence of isoform. Expression analysis revealed developmentally regulated and stage-specific expression patterns in all of the genes. We further analyzed the genes at the protein and cellular levels. Transfection assays performed using GC-2 cells provided information on the cellular characteristics of the gene products. In addition, antibodies were generated against proteins encoded by some of the genes to facilitate their identification and characterization in spermatogenic cells and sperm. Our data suggest that a number of the gene products are implicated in transcriptional regulation, nuclear integrity, sperm structure and motility, and fertilization. In particular, we found for the first time that Mm.333010, predicted to contain a trypsin-like serine protease domain, is a sperm acrosomal protein. Conclusion We identify 24 authentic genes with spermatogenic cell-specific expression, and provide comprehensive information about the genes. Our findings establish a new basis for future investigation into molecular mechanisms underlying male reproduction.

Choi, Eunyoung; Lee, Jiae; Oh, Jungsu; Park, Inju; Han, Cecil; Yi, Chongil; Kim, Do Han; Cho, Byung-Nam; Eddy, Edward M; Cho, Chunghee

2007-01-01

188

Molecular cloning, chromosomal assignment, and expression of the mouse aspartylglucosaminidase gene  

SciTech Connect

Aspartylglucosaminidase (AGA) is a lysosomal enzyme, the deficiency of which leads to human lysosomal storage disease aspartylglucosaminuria. Here, we describe isolation, chromosomal location, genomic structure, and tissue-specific expression of the mouse Aga gene as well as the intracellular processing of the mouse Aga polypeptide and compare these characteristics to human AGA. The mouse Aga gene was localized to the central area of the B region of chromosome 8, which represents the synteny group in the human chromosome 4q telomeric region where the human AGA gene is located. The mouse gene spans an 11-kb genomic region and contains nine exons and eight introns, which is analogous to the human gene. Furthermore, the exon-intron boundaries of the mouse and human genes are identically positioned. The nucleotide sequence identity of the cDNA and deduced amino acid sequence identity of the protein are 84.4 and 82.4%, respectively. However, the mouse Aga cDNA contains untranslated regions that are shorter than those in the human cDNA, and only one 1.2-kb mRNA transcript is produced in mouse versus two transcripts in human. Expression of the mouse Aga cDNA in COS-1 cells showed that the mouse Aga polypeptide was processed similarly to the human counterpart. 36 refs., 5 figs.

Tenhunen, K.; Manninen, T.; Peltonen, L. [National Public Health Institute, Helsinki (Finland)] [and others

1995-11-20

189

Identification and characterization of human LLGL4 gene and mouse Llgl4 gene in silico.  

PubMed

Drosophila Discs large (Dlg), Scribble (Scrib) and Lethal giant larvae (Lgl) act in concert as regulators of epithelial polarity, and human homologs of Drosophila dlg, scrib, and lgl are cancer-associated genes. LLGL1, LLGL2, and LLGL3/STXBP5 genes, encoding LGL1, LGL2, and LGL3/Tomosyn, respectively, are human homologs of Drosophila lgl gene. Here, we identified and characterized LLGL4 (also known as STXBP5L) gene encoding LGL4 protein, by using bioinformatics. Uncharacterized human KIAA1006 cDNA (AB023223) was derived from human LLGL4 gene. LLGL4 mRNA was expressed in kidney, brain hippocampus, and also in lung carcinoid, and germ cell tumors. LLGL4 gene, consisting of 28 exons, was mapped to human chromosome 3q13.33. Mouse A830015P08Rik cDNA (NM_172440.1) was a 3'-truncated partial Llgl4 cDNA. Nucleotide sequence of full-length mouse Llgl4 cDNA was determined in silico by assembling A830015P08Rik cDNA, BU609516 EST and last two exons of Llgl4 gene within mouse genome clone RP24-174G4 (AC118742.3). Human LGL4 showed 95.8% total-amino-acid identity with mouse Lgl4, and 68.4% total-amino-acid identity with human LGL3. LGLH1 domain (codon 1-11 of LGL4), LGLH2 domain (codon 52-98) and LGLH3 domain (codon 994-1054) were identified as novel conserved regions among LGL family members. LGL1 and LGL2 consist of LGLH1, LGLH2, LGLH3 domains and five WD40 repeats, while LGL3 and LGL4 consist of LGLH1, LGLH2, LGLH3 domains, five WD40 repeats and the C-terminal Syntaxin-binding SNARE domain. This is the first report on identification and characterization of human LLGL4 and mouse Llgl4 genes. PMID:14767561

Katoh, Masuko; Katoh, Masaru

2004-03-01

190

Genomic organization of the mouse dystrobrevin gene: Comparative analysis with the dystrophin gene  

SciTech Connect

Dystrobrevin, the mammalian orthologue of the Torpedo 87-kDa postsynaptic protein, is a member of the dystrophin gene family with homology to the cysteine-rich carboxy-terminal domain of dystrophin. Torpedo dystrobrevin copurifies with the acetylcholine receptors and is thought to form a complex with dystrophin and syntrophin. This complex is also found at the sarcolemma in vertebrates and defines the cytoplasmic component of the dystrophin-associated protein complex. Previously we have cloned several dystrobrevin isoforms from mouse brain and muscle. Here we show that these transcripts are the products of a single gene located on proximal mouse chromosome 18. To investigate the diversity of dystrobrevin transcripts we have determined that the mouse dystrobrevin gene is organized into 24 coding exons that span between 130 and 170 kb at the genomic level. The gene encodes at least three distinct protein isoforms that are expressed in a tissue-specific manner. Interestingly, although there is only 27% amino acid identity between the homologous regions of dystrobrevin and dystrophin, the positions of 8 of the 15 exon-intron junctions are identical. 47 refs., 4 figs., 2 tabs.

Ambrose, H.J.; Blake, D.J.; Nawrotzki, R.A.; Davies, K.E. [Univ. of Oxford (United Kingdom)

1997-02-01

191

Microarray and comparative genomics-based identification of genes and gene regulatory regions of the mouse immune system  

Microsoft Academic Search

BACKGROUND: In this study we have built and mined a gene expression database composed of 65 diverse mouse tissues for genes preferentially expressed in immune tissues and cell types. Using expression pattern criteria, we identified 360 genes with preferential expression in thymus, spleen, peripheral blood mononuclear cells, lymph nodes (unstimulated or stimulated), or in vitro activated T-cells. RESULTS: Gene clusters,

John J Hutton; Anil G Jegga; Sue Kong; Ashima Gupta; Catherine Ebert; Sarah Williams; Jonathan D Katz; Bruce J Aronow

2004-01-01

192

Targeted disruption of the mouse Lipoma Preferred Partner gene  

SciTech Connect

LPP (Lipoma Preferred Partner) is a zyxin-related cell adhesion protein that is involved in the regulation of cell migration. We generated mice with a targeted disruption of the Lpp gene and analysed the importance of Lpp for embryonic development and adult functions. Aberrant Mendelian inheritance in heterozygous crosses suggested partial embryonic lethality of Lpp{sup -/-} females. Fertility of Lpp{sup -/-} males was proven to be normal, however, females from Lpp{sup -/-} x Lpp{sup -/-} crosses produced a strongly reduced number of offspring, probably due to a combination of female embryonic lethality and aberrant pregnancies. Apart from these developmental and reproductive abnormalities, Lpp{sup -/-} mice that were born reached adulthood without displaying any additional macroscopic defects. On the other hand, Lpp{sup -/-} mouse embryonic fibroblasts exhibited reduced migration capacity, reduced viability, and reduced expression of some Lpp interaction partners. Finally, we discovered a short nuclear form of Lpp, expressed mainly in testis via an alternative promoter.

Vervenne, Hilke B.V.K.; Crombez, Koen R.M.O.; Delvaux, Els L. [Laboratory for Molecular Oncology, Department of Human Genetics, Herestraat 49, Box 602, K.U.Leuven, Leuven (Belgium); Janssens, Veerle [Protein Phosphorylation and Proteomics Laboratory, Department of Molecular Cell Biology, K.U.Leuven, Leuven (Belgium); Ven, Wim J.M. van de [Laboratory for Molecular Oncology, Department of Human Genetics, Herestraat 49, Box 602, K.U.Leuven, Leuven (Belgium)], E-mail: wim.vandeven@med.kuleuven.be; Petit, Marleen M.R. [Laboratory for Molecular Oncology, Department of Human Genetics, Herestraat 49, Box 602, K.U.Leuven, Leuven (Belgium)

2009-02-06

193

Genomic cloning of mouse MIF (macrophage inhibitory factor) and genetic mapping of the human and mouse expressed gene and nine mouse pseudogenes  

SciTech Connect

The single functional mouse gene for MIF (macrophage migration inhibitory factor) has been cloned from a P1 library, and its exon/intron structure determined and shown to resemble that of the human gene. The gene was mapped to chromosome 10 using two multilocus crosses between laboratory strains and either Mus musculus or Mus spretus. Nine additional loci containing related sequences, apparently all processed pseudogenes, were also mapped to chromosomes 1, 2, 3, 7, 8, 9, 12, 17, and 19. While most of these pseudogenes were also found in inbred mice and M. spretus, some are species specific. This suggests that there have been active phases of pseudogene formation in Mus both before and after the separation of musculus and spretus. The human gene contains no pseudogene; we assigned the human gene to chromosome 19, consistent with the location of mouse and human functional genes for MIF in a region of conserved linkage. 43 refs., 4 figs., 1 tab.

Kozak, C.A.; Adamson, M.C.; Buckler, C.E. [National Institute of Allergy and Infectious Diseases, Bethesda, MD (United States)] [and others

1995-06-10

194

Praja1, a novel gene encoding a RING-H2 motif in mouse development  

Microsoft Academic Search

As part of a cloning strategy to identify genes involved in early mouse liver development we have isolated Praja1, a gene with similar sequences to the Drosophila melanogaster gene goliath (gl) which is involved in the fate of mesodermal cells ultimately forming gut musculatures, fat body, and the heart. Praja1 is a 2.1 kb gene encoding a putative 396 amino

L Mishra; R E Tully; S P S Monga; Ping Yu; Tao Cai; W Makalowski; E Mezey; W J Pavan; B Mishra

1997-01-01

195

The NEUROD gene maps to human chromosome 2q32 and mouse chromosome 2  

SciTech Connect

The Neurod gene is a basic-helix-loop-helix gene that regulates neurogenesis and is identical to the hamster beta2 gene that was cloned as a regulator of insulin transcription. Here we report the cloning of human NEUROD and mapping of the gene to human chromosome 2q32 and to mouse chromosome 2. 12 refs., 1 fig.

Tamimi, R.; Dyer-Montgomery, K.; Hernandez, R.; Tapscott, S.J. [Fred Hutchinson Cancer Research Center, Seattle, WA (United States)] [and others

1996-06-15

196

Odorant receptor gene choice is reset by nuclear transfer from mouse olfactory sensory neurons  

Microsoft Academic Search

Of the ~1,000 odorant receptor (OR) genes in the mouse genome, an olfactory sensory neuron (OSN) is thought to express one gene, from one allele. This is reminiscent of immunoglobulin and T-cell receptor genes, which undergo DNA rearrangements in lymphocytes. Here, we test the hypothesis that OR gene choice is controlled by DNA rearrangements in OSNs. Using permanent genetic marking,

Jinsong Li; Tomohiro Ishii; Paul Feinstein; Peter Mombaerts

2004-01-01

197

Identification of a set of genes showing regionally enriched expression in the mouse brain  

Microsoft Academic Search

BACKGROUND: The Pleiades Promoter Project aims to improve gene therapy by designing human mini-promoters (< 4 kb) that drive gene expression in specific brain regions or cell-types of therapeutic interest. Our goal was to first identify genes displaying regionally enriched expression in the mouse brain so that promoters designed from orthologous human genes can then be tested to drive reporter

Cletus A D'Souza; Vikramjit Chopra; Richard Varhol; Yuan-Yun Xie; Slavita Bohacec; Yongjun Zhao; Lisa LC Lee; Mikhail Bilenky; Elodie Portales-Casamar; An He; Wyeth W Wasserman; Daniel Goldowitz; Marco A Marra; Robert A Holt; Elizabeth M Simpson; Steven JM Jones

2008-01-01

198

Isolation and characterization of 5'-regulatory region of mouse activin beta A subunit gene.  

PubMed

We isolated genomic clones that contain the 5'-flanking region of the mouse activin beta A subunit gene. The nucleotide sequence determination of the 5'-flanking region of the gene and the comparison of that with the reported mouse cDNA structure identified the putative 5' regulatory region, a novel first exon and a part of the first intron of the gene within this region. The putative 5' regulatory region of the mouse activin beta A subunit gene directed the expression of CAT gene in transfected HT1080 cells. Successive deletions of this region demonstrated a 400-bp region that exerts a strong positive effect on promoter activity of the mouse activin beta A subunit gene. PMID:9530515

Yoshida, E; Tanimoto, K; Murakami, K; Fukamizu, A

1998-02-01

199

The mouse homologue of the polycystic kidney disease gene (Pkd1) is a single-copy gene  

SciTech Connect

The mouse homologue of the polycystic kidney disease 1 gene (PKD1) was mapped to chromosome 17 using somatic cell hybrid, BXD recombinant inbred strains, and FISH. The gene is located within a previously defined conserved synteny group that includes the mouse homologue of tuberous sclerosis 2 (TSC2) and is linked to the {alpha} globin pseudogene Hba-ps4. Although the human genome contains multiple copies of genes related to PKD1, there is no evidence for more than one copy in the mouse genome. Like their human counterparts, the mouse Tsc2 and Pkd1 genes are arranged in a tail-to-tail orientation with a distance of only 63 bp between the polyadenylation signals of the two genes. 17 refs., 3 figs.

Olsson, P.G.; Loehning, C.; Frischauf, A.M. [Imperial Cancer Research Fund, London (United Kingdom)] [and others

1996-06-01

200

Organization and evolution of D region class I genes in the mouse major histocompatibility complex  

PubMed Central

Chromosome walking has been used to study the organization of the class I genes in the D and Qa regions of the MHC of the BALB/c mouse and in the D region of the AKR mouse. Five and eight class I genes are found in the D and Qa regions of the BALB/c mouse, respectively, while the AKR mouse contains only a single class I D region gene that has been identified by transfection as the Dk gene. Restriction map homologies and crosshybridization experiments suggest that the multiple class I genes in the D region of the BALB/c mouse have been generated by unequal crossing-over involving class I genes from the Qa region. The expanded D region of BALB/c and other H-2d haplotype mouse strains appears to be metastable, since evidence for gene contraction in the Dd region has been found in two mutant strains. Thus the D region and also the Qa region class I genes are in a dynamic state, evolving by gene expansion and contraction.

1986-01-01

201

Metallothionein expression in human breast cancer.  

PubMed Central

Metallothioneins are ubiquitous low molecular weight proteins characterised by high cysteine content and affinity for binding heavy metals. Abnormal metallothionein function and expression have been implicated in various disease states, including neoplasia. The aim of this study was to investigate metallothionein expression in human breast carcinoma. Sections of routinely fixed and processed blocks of tumour from 100 consecutive cases of primary operable breast carcinoma were stained for metallothionein using a recently developed monoclonal antibody and a standard immunohistochemical technique. Expression was scored on the basis of microscopical assessment of percentage of tumour cells staining. One patient was lost to follow-up and excluded from the study. A significant association (P < 0.0001) was observed between metallothionein expression and tumour type, with low levels being observed in tumours of good prognostic type. There was also a significant association with local recurrence (P < 0.02) and a significant difference (P < 0.02) in both survival and disease-free interval between tumours showing low and high levels of expression, the latter indicating a poor prognosis. No relationship was observed with patient age, tumour size, lymph node stage, histological grade, vascular invasion, menopausal status or oestrogen receptor status. The assessment of metallothionein expression in human breast cancer appears to provide prognostic information and may have important implications for understanding its development. Images Figure 1 Figure 2

Goulding, H.; Jasani, B.; Pereira, H.; Reid, A.; Galea, M.; Bell, J. A.; Elston, C. W.; Robertson, J. F.; Blamey, R. W.; Nicholson, R. A.

1995-01-01

202

Sense-antisense gene pairs: sequence, transcription, and structure are not conserved between human and mouse  

PubMed Central

Previous efforts to characterize conservation between the human and mouse genomes focused largely on sequence comparisons. These studies are inherently limited because they don't account for gene structure differences, which may exist despite genomic sequence conservation. Recent high-throughput transcriptome studies have revealed widespread and extensive overlaps between genes, and transcripts, encoded on both strands of the genomic sequence. This overlapping gene organization, which produces sense-antisense (SAS) gene pairs, is capable of effecting regulatory cascades through established mechanisms. We present an evolutionary conservation assessment of SAS pairs, on three levels: genomic, transcriptomic, and structural. From a genome-wide dataset of human SAS pairs, we first identified orthologous loci in the mouse genome, then assessed their transcription in the mouse, and finally compared the genomic structures of SAS pairs expressed in both species. We found that approximately half of human SAS loci have single orthologous locations in the mouse genome; however, only half of those orthologous locations have SAS transcriptional activity in the mouse. This suggests that high human-mouse gene conservation overlooks widespread distinctions in SAS pair incidence and expression. We compared gene structures at orthologous SAS loci, finding frequent differences in gene structure between human and orthologous mouse SAS pair members. Our categorization of human SAS pairs with respect to mouse conservation of expression as well as structure points to limitations of mouse models. Gene structure differences, including at SAS loci, may account for some of the phenotypic distinctions between primates and rodents. Genes in non-conserved SAS pairs may contribute to evolutionary lineage-specific regulatory outcomes.

Wood, Emily J.; Chin-Inmanu, Kwanrutai; Jia, Hui; Lipovich, Leonard

2013-01-01

203

Human and mouse switch-like genes share common transcriptional regulatory mechanisms for bimodality  

PubMed Central

Background Gene expression is controlled over a wide range at the transcript level through complex interplay between DNA and regulatory proteins, resulting in profiles of gene expression that can be represented as normal, graded, and bimodal (switch-like) distributions. We have previously performed genome-scale identification and annotation of genes with switch-like expression at the transcript level in mouse, using large microarray datasets for healthy tissue, in order to study the cellular pathways and regulatory mechanisms involving this class of genes. We showed that a large population of bimodal mouse genes encoding for cell membrane and extracellular matrix proteins is involved in communication pathways. This study expands on previous results by annotating human bimodal genes, investigating their correspondence to bimodality in mouse orthologs and exploring possible regulatory mechanisms that contribute to bimodality in gene expression in human and mouse. Results Fourteen percent of the human genes on the HGU133A array (1847 out of 13076) were identified as bimodal or switch-like. More than 40% were found to have bimodal mouse orthologs. KEGG pathways enriched for bimodal genes included ECM-receptor interaction, focal adhesion, and tight junction, showing strong similarity to the results obtained in mouse. Tissue-specific modes of expression of bimodal genes among brain, heart, and skeletal muscle were common between human and mouse. Promoter analysis revealed a higher than average number of transcription start sites per gene within the set of bimodal genes. Moreover, the bimodal gene set had differentially methylated histones compared to the set of the remaining genes in the genome. Conclusion The fact that bimodal genes were enriched within the cell membrane and extracellular environment make these genes as candidates for biomarkers for tissue specificity. The commonality of the important roles bimodal genes play in tissue differentiation in both the human and mouse indicates the potential value of mouse data in providing context for human tissue studies. The regulation motifs enriched in the bimodal gene set (TATA boxes, alternative promoters, methlyation) have known associations with complex diseases, such as cancer, providing further potential for the use of bimodal genes in studying the molecular basis of disease.

Ertel, Adam; Tozeren, Aydin

2008-01-01

204

Structural characterization and thermal stability of Notothenia coriiceps metallothionein.  

PubMed Central

Fish and mammalian metallothioneins (MTs) differ in the amino acid residues placed between their conserved cysteines. We have expressed the MT of an Antarctic fish, Notothenia coriiceps, and characterized it by means of multinuclear NMR spectroscopy. Overall, the architecture of the fish MT is very similar to that of mammalian MTs. However, NMR spectroscopy shows that the dynamic behaviour of the two domains is markedly different. With the aid of absorption and CD spectroscopies, we studied the conformational and electronic features of fish and mouse recombinant Cd-MT and the changes produced in these proteins by heating. When the temperature was increased from 20 to 90 degrees C, the Cd-thiolate chromophore absorbance at 254 nm of mouse MT was not modified up to 60 degrees C, whereas the absorbance of fish MT decreased significantly starting from 30 degrees C. The CD spectra also changed quite considerably with temperature, with a gradual decrease of the positive band at 260 nm that was more pronounced for fish than for mouse MT. The differential effect of temperature on fish and mouse MTs may reflect a different stability of metal-thiolate clusters of the two proteins. Such a conclusion is also corroborated by results showing differences in metal mobility between fish and mouse Zn-MT.

D'Auria, S; Carginale, V; Scudiero, R; Crescenzi, O; Di Maro, D; Temussi, P A; Parisi, E; Capasso, C

2001-01-01

205

Structural characterization and thermal stability of Notothenia coriiceps metallothionein.  

PubMed

Fish and mammalian metallothioneins (MTs) differ in the amino acid residues placed between their conserved cysteines. We have expressed the MT of an Antarctic fish, Notothenia coriiceps, and characterized it by means of multinuclear NMR spectroscopy. Overall, the architecture of the fish MT is very similar to that of mammalian MTs. However, NMR spectroscopy shows that the dynamic behaviour of the two domains is markedly different. With the aid of absorption and CD spectroscopies, we studied the conformational and electronic features of fish and mouse recombinant Cd-MT and the changes produced in these proteins by heating. When the temperature was increased from 20 to 90 degrees C, the Cd-thiolate chromophore absorbance at 254 nm of mouse MT was not modified up to 60 degrees C, whereas the absorbance of fish MT decreased significantly starting from 30 degrees C. The CD spectra also changed quite considerably with temperature, with a gradual decrease of the positive band at 260 nm that was more pronounced for fish than for mouse MT. The differential effect of temperature on fish and mouse MTs may reflect a different stability of metal-thiolate clusters of the two proteins. Such a conclusion is also corroborated by results showing differences in metal mobility between fish and mouse Zn-MT. PMID:11171106

D'Auria, S; Carginale, V; Scudiero, R; Crescenzi, O; Di Maro, D; Temussi, P A; Parisi, E; Capasso, C

2001-03-01

206

Cereal genes similar to Snf2 define a new subfamily that includes human and mouse genes.  

PubMed

Genes from the SNF2 family play important roles in transcriptional regulation, maintenance of chromosome integrity and DNA repair. This study describes the molecular cloning and characterization of cereal genes from this family. The predicted proteins exhibit a novel C-terminal domain that defines a new subfamily designated SNF2P that includes human and mouse proteins. Comparison between genomic and cDNA sequences showed that cereal Snf2P genes consisted of 17 exons, including one only 8 bp long. Two barley alleles differed by the presence of a 7.7-kb non-LTR retrotransposon in intron 6. An alternative annotation of the orthologous Arabidopsis gene would improve its similarity with the other members of the subfamily. Intron 2 was not spliced out in approximately half of the rice Snf2P mRNAs present in leaves, resulting in a premature stop codon. Transcripts from the barley and wheat Snf2P genes were found in apexes, leaves, sheaths, roots and spikes. The Snf2P genes exist as single copies on wheat chromosome arm 5A(m)L and in the colinear regions on barley chromosome arm 4HL and rice chromosome 3. High-density genetic mapping and RT-PCR suggest that Snf2P is not a candidate gene for the tightly linked vernalization gene Vrn2. PMID:12471446

Yan, L; Echenique, V; Busso, C; SanMiguel, P; Ramakrishna, W; Bennetzen, J L; Harrington, S; Dubcovsky, J

2002-10-24

207

Metallothionein as an Anti-Inflammatory Mediator  

PubMed Central

The integration of knowledge concerning the regulation of MT, a highly conserved, low molecular weight, cystein-rich metalloprotein, on its proposed functions is necessary to clarify how MT affects cellular processes. MT expression is induced/enhanced in various tissues by a number of physiological mediators. The cellular accumulation of MT depends on the availability of cellular zinc derived from the diet. MT modulates the binding and exchange/transport of heavy metals such as zinc, cadmium, or copper under physiological conditions and cytoprotection from their toxicities, and the release of gaseous mediators such as hydroxyl radicals or nitric oxide. In addition, MT reportedly affects a number of cellular processes, such as gene expression, apoptosis, proliferation, and differentiation. Given the genetic approach, the apparently healthy status of MT-deficient mice argues against an essential biological role for MT; however, this molecule may be critical in cells/tissues/organs in times of stress, since MT expression is also evoked/enhanced by various stresses. In particular, because metallothionein (MT) is induced by inflammatory stress, its roles in inflammation are implied. Also, MT expression in various organs/tissues can be enhanced by inflammatory stimuli, implicating in inflammatory diseases. In this paper, we review the role of MT of various inflammatory conditions.

Inoue, Ken-ichiro; Takano, Hirohisa; Shimada, Akinori; Satoh, Masahiko

2009-01-01

208

Metallothionein induction: a measure of radioprotective action  

SciTech Connect

Mice treated to induce metallothionein (MT) synthesis in the liver prior to irradiation were resistant to radiation; this also was true of mice that had a portion of skin surgically removed or an immunomodulator administered. Mice given Mn, Cd or Zn subcutaneously prior to irradiation showed increased tolerance to an LD50 level (6-8 Gy) of x rays compared with controls that received no pretreatments (p less than 0.01). All the mice were evaluated during a 30-d postirradiation period. Weight loss in control mice peaked two weeks after irradiation, whereas body weight in mice pretreated with Mn continued to increase after irradiation with x rays. The normal level of MT in mouse liver (25 micrograms g-1 tissue) increased to 70 micrograms g-1 liver tissue in mice irradiated with 6.3-Gy x rays. However, following subcutaneous injection of Cd, Mn or Zn, or intraperitoneal injection of OK-432 (Picibanil, a killed streptococcal preparation, MT levels in liver increased by a factor of 2-8 compared to irradiated that were not treated with the reagents listed above. The mortality rate of mice with a surgically excised 2 X 2-cm2 portion of dorsal skin or of those administered OK-432 was lower than that of controls, and MT levels in liver (150-400 micrograms g-1 tissue) were higher than those of irradiated mice that were not surgically treated. These results suggest that the body's protective action against radiation correlates with the biosynthesis of MT, or that MT acts as a scavenger of radiation-induced peroxides.

Matsubara, J.

1988-08-01

209

An analysis of the human and mouse CXCR5 gene introns.  

PubMed

Both mouse and human chemokine receptor CXC motif 5 (CXCR5) genes exhibit one single intron interrupting the coding sequence. The mouse intron is 12053 nucleotides (nt) long; the human intron is 9603 nt long. Sections of the mouse intron significantly align plus/plus with sections of the human intron; the aligned segments are in the same order in mouse as in man and overall cover 13% of the mouse sequence and 17% of the human sequence. The human CXCR5 intron harbors sequences derived from retroviruses (human endogenous retroviruses). The mouse intron comprises very similar sequences. About 70% of the mouse intron sequence is 'specific' to this gene, while sequences in the rest of the intron are shared with many other genes located on different chromosomes. In the human the coverage by specific sequences is about 87%. Thus, the contribution of transposable elements is significantly higher in mouse (30%) than in man (13%). Intra-intronic plus/minus alignments exist in mouse (10 couples) and man (two couples): these may form stem and loop structures determining the secondary structure of the corresponding pre-mRNAs. PMID:20809769

Panaro, Maria Antonietta; Calvello, Rosa; Mitolo, Carlo Ivan; Sisto, Margherita; Saccia, Matteo; Cianciulli, Antonia

2010-09-01

210

Two alkaline phosphatase genes are expressed during early development in the mouse embryo  

Microsoft Academic Search

Alkaline phosphatase (AP) activity is stage specific in mouse embryos and may be associated with compaction and separation of trophectoderm from inner cell mass in preimplantation development. We previously sequenced a cDNA and two mouse AP genes that could contribute to the AP activity in embryos. Oligonucleotide primers were constructed from the three sequences and used in the reverse transcription-polymerase

Ann C. Hahnel; Daniel A. Rappolee; Jose Luis Millan; Thomas Manes; Carol A. Ziomek; Nicoleta G. Theodosiou; Zena Werb; Roger A. Pedersen; Gilbert A. Schultz

1990-01-01

211

Multiple Regulatory Regions on the 5' Side of the Mouse Ealpha Gene  

Microsoft Academic Search

The function of the 5'-flanking region of the mouse major histocompatibility complex gene Ealphad has been studied by deletion analysis with the chloramphenicol acetyltransferase gene as a transient expression marker in various cell lines. This analysis reveals the presence of several control regions on the 5' side of the gene. Sequences between base pair (bp) -873 and bp -353 have

Dimitris Thanos; George Mavrothalassitis; Joseph Papamatheakis

1988-01-01

212

Efficient Gene Transfer into the Embryonic Mouse Brain Using in Vivo Electroporation  

Microsoft Academic Search

Mouse genetic manipulation has provided an excellent system to characterize gene function in numerous contexts. A number of mutants have been produced by using transgenic, gene knockout, and mutagenesis techniques. Nevertheless, one limitation is that it is difficult to express a gene in vivo in a restricted manner (i.e., spatially and temporally), because the number of available enhancers and promoters

Tetsuichiro Saito; Norio Nakatsuji

2001-01-01

213

Inferring Nonneutral Evolution from Human-Chimp-Mouse Orthologous Gene Trios  

Microsoft Academic Search

Even though human and chimpanzee gene sequences are nearly 99% identical, sequence comparisons can nevertheless be highly informative in identifying biologically important changes that have occurred since our ancestral lineages diverged. We analyzed alignments of 7645 chimpanzee gene sequences to their human and mouse orthologs. These three-species sequence alignments allowed us to identify genes undergoing natural selection along the human

Andrew G. Clark; Stephen Glanowski; Rasmus Nielsen; Paul D. Thomas; Anish Kejariwal; Melissa A. Todd; David M. Tanenbaum; Daniel Civello; Fu Lu; Brian Murphy; Steve Ferriera; Gary Wang; Xianqgun Zheng; Thomas J. White; John J. Sninsky; Mark D. Adams; Michele Cargill

2003-01-01

214

Number of CpG Islands and Genes in Human and Mouse  

Microsoft Academic Search

Estimation of gene number in mammals is difficult due to the high proportion of noncoding DNA within the nucleus. In this study, we provide a direct measurement of the number of genes in human and mouse. We have taken advantage of the fact that many mammalian genes are associated with CpG islands whose distinctive properties allow their physical separation from

Francisco Antequera; Adrian Bird

1993-01-01

215

Quantitative analysis of TRP channel genes in mouse organs.  

PubMed

The transient receptor potential (TRP) channel superfamily is a set of channel genes that mediate numerous physiological functions such as sensing irritants or detecting temperature changes. Despite their functions, expressional information on TRP channels in various organs is largely elusive. Therefore, we conducted a systematic quantitative comparison of each mRNA expression level of 22 mouse TRP channels in various organs. As a result, we found that average levels of TRP channel transcripts were very low reaching ?3% of the GAPDH transcript level. Among 22 TRP channels, TRPC1 and TRPM7 were most abundant in the majority of organs. In contrast, TRPV3, TRPV5, TRPV6, TRPC7, TRPM1, and TRPM5 elicited very low message profiles throughout the major organs. Consistent with their functions as molecular sensors for irritants and temperature changes, TRPV1, TRPM8 and TRPA1 showed exclusive expression in sensory ganglia. TRPC3 and TRPM3 were abundant in the sensory ganglia and brain. High levels of transcripts of TRPV2, TRPC6, TRPM4, and TRPM6 were observed in the lung. In addition, channel transcript levels were very low except TRPM7 in the liver. In summary, the expression profile of TRP channels in major tissues provides insight to their physiological functions and therefore application to new drug development. PMID:23139135

Jang, Yongwoo; Lee, Yunjong; Kim, Sung Min; Yang, Young Duk; Jung, Jooyoung; Oh, Uhtaek

2012-11-09

216

The relaxin gene knockout mouse: a model of progressive scleroderma.  

PubMed

Relaxin is a peptide hormone with anti-fibrotic properties. To investigate the long-term effects of relaxin deficiency on the ageing skin, we compared structural changes in the skin of ageing relaxin-deficient (RLX-/-) and normal (RLX+/+) mice, by biochemical, histological, and magnetic resonance imaging analyses. Skin biopsies from RLX+/+ and RLX-/- mice were obtained at different ages and analyzed for changes in collagen expression and distribution. We demonstrated an age-related progression of dermal fibrosis and thickening in male and female RLX-/- mice, associated with marked increases in types I and III collagen. The increased collagen was observed primarily in the dermis of RLX-/- mice by 1 mo of age, and eventually superseded the hypodermal layer. Additionally, fibroblasts from the dermis of RLX-/- mice were shown to produce increased collagen in vitro. Recombinant human gene-2 (H2) relaxin treatment of RLX-/- mice resulted in the complete reversal of dermal fibrosis, when applied to the early onset of disease, but was ineffective when applied to more established stages of dermal scarring. These combined findings demonstrate that relaxin provides a means to regulate excessive collagen deposition in disease states characterized by dermal fibrosis and with our previously published work demonstrate the relaxin-null mouse as a model of progressive scleroderma. PMID:16185267

Samuel, Chrishan S; Zhao, Chongxin; Yang, Qing; Wang, Hong; Tian, Hongsheng; Tregear, Geoffrey W; Amento, Edward P

2005-10-01

217

Otitis Media Impacts Hundreds of Mouse Middle and Inner Ear Genes  

PubMed Central

Objective Otitis media is known to alter expression of cytokine and other genes in the mouse middle ear and inner ear. However, whole mouse genome studies of gene expression in otitis media have not previously been undertaken. Ninety-nine percent of mouse genes are shared in the human, so these studies are relevant to the human condition. Methods To assess inflammation-driven processes in the mouse ear, gene chip analyses were conducted on mice treated with trans-tympanic heat-killed Hemophilus influenza using untreated mice as controls. Middle and inner ear tissues were separately harvested at 6 hours, RNA extracted, and samples for each treatment processed on the Affymetrix 430 2.0 Gene Chip for expression of its 34,000 genes. Results Statistical analysis of gene expression compared to control mice showed significant alteration of gene expression in 2,355 genes, 11% of the genes tested and 8% of the mouse genome. Significant middle and inner ear upregulation (fold change >1.5, p<0.05) was seen in 1,081 and 599 genes respectively. Significant middle and inner ear downregulation (fold change <0.67, p<0.05) was seen in 978 and 287 genes respectively. While otitis media is widely believed to be an exclusively middle ear process with little impact on the inner ear, the inner ear changes noted in this study were numerous and discrete from the middle ear responses. This suggests that the inner ear does indeed respond to otitis media and that its response is a distinctive process. Numerous new genes, previously not studied, are found to be affected by inflammation in the ear. Conclusion Whole genome analysis via gene chip allows simultaneous examination of expression of hundreds of gene families influenced by inflammation in the middle ear. Discovery of new gene families affected by inflammation may lead to new approaches to the study and treatment of otitis media.

MacArthur, Carol J.; Hausman, Fran; Kempton, J. Beth; Choi, Dongseok; Trune, Dennis R.

2013-01-01

218

Isolation and characterisation of two divergent type 3 metallothioneins from oil palm, Elaeis guineensis  

Microsoft Academic Search

Two distinct class I, type 3 metallothionein-like genes, MT3-A and MT3-B, were isolated from the oil palm, Elaeis guineensis. The MT3-A gene was isolated by subtractive hybridisation from a cDNA library prepared from mesocarp tissue at 15 weeks after anthesis (waa). The MT3-A mRNA made up over 1% of total transcripts and was the most abundant gene product in this

Siti Nor Akmar Abdullah; S. C. Cheah; Denis J. Murphy

2002-01-01

219

IDENTIFICATION AND CHARACTERIZATION OF METALLOTHIONEIN-1 AND 2 GENE EXPRESSION IN THE CONTEXT OF (±)3,4-METHYLENEDIOXYMETHAMPHETAMINE (MDMA)-INDUCED TOXICITY TO BRAIN DOPAMINERGIC NEURONS  

Technology Transfer Automated Retrieval System (TEKTRAN)

In mice, the recreational drug (+/-)3,4-methylenedioxymethamphetamine [MDMA ("ecstasy")] produces a selective toxic effect on brain dopamine (DA) neurons. Using cDNA microarray technology in combination with an approach designed to facilitate recognition of relevant changes in gene expression, the p...

220

Genomic Organization, Expression, and Chromosomal Mapping of the Mouse Adrenomedullin Gene  

Microsoft Academic Search

We have isolated and characterized the mouse adrenomedullin (AM) gene (Adm) and determined its chromosomal location. The gene spans approximately 2.1 kb and is organized into four exons separated by three introns. The transcription start site was determined to be the adenine nucleotide at ?618. The mouse AM 5?-flanking region contains a TATA box-like sequence and severalcis-acting regulatory elements. Analysis

Taku Okazaki; Yoshihiro Ogawa; Naohisa Tamura; Kiyoshi Mori; Naohi Isse; Tomohiro Aoki; Julie M. Rochelle; Makoto M. Taketo; Michael F. Seldin; Kazuwa Nakao

1996-01-01

221

Gene expression profiles of the collecting duct in the mouse renal inner medulla  

Microsoft Academic Search

Gene expression profiles of the collecting duct in the mouse renal inner medulla.BackgroundGene expression profiles, constructed from 1000 to 2000 cloned cDNA sequences, depict their relative abundance of expression in a tissue. Establishing such a profile for mouse inner renal medullary collecting ducts (IMCDs), we compared expression patterns with those in other tissues including proximal tubule.MethodsA nonbiased 3?-end cDNA library

Masaru Takenaka; Enyu Imai; Yasuyuki Nagasawa; Yasuko Matsuoka; Toshiki Moriyama; Tetsuya Kaneko; Masatsugu Hori; Shoko Kawamoto; Kousaku Okubo

2000-01-01

222

Determination of reference genes for circadian studies in different tissues and mouse strains  

PubMed Central

Background Circadian rhythms have a profound effect on human health. Their disruption can lead to serious pathologies, such as cancer and obesity. Gene expression studies in these pathologies are often studied in different mouse strains by quantitative real time polymerase chain reaction (qPCR). Selection of reference genes is a crucial step of qPCR experiments. Recent studies show that reference gene stability can vary between species and tissues, but none has taken circadian experiments into consideration. Results In the present study the expression of ten candidate reference genes (Actb, Eif2a, Gapdh, Hmbs, Hprt1, Ppib, Rn18s, Rplp0, Tbcc and Utp6c) was measured in 131 liver and 97 adrenal gland samples taken from three mouse strains (C57BL/6JOlaHsd, 129Pas plus C57BL/6J and Crem KO on 129Pas plus C57BL/6J background) every 4 h in a 24 h period. Expression stability was evaluated by geNorm and NormFinder programs. Differences in ranking of the most stable reference genes were observed both between individual mouse strains as well as between tissues within each mouse strain. We show that selection of reference gene (Actb) that is often used for analyses in individual mouse strains leads to errors if used for normalization when different mouse strains are compared. We identified alternative reference genes that are stable in these comparisons. Conclusions Genetic background and circadian time influence the expression stability of reference genes. Differences between mouse strains and tissues should be taken into consideration to avoid false interpretations. We show that the use of a single reference gene can lead to false biological conclusions. This manuscript provides a useful reference point for researchers that search for stable reference genes in the field of circadian biology.

2010-01-01

223

Identification and characterization of human MPP7 gene and mouse Mpp7 gene in silico.  

PubMed

Drosophila Crumbs (Crb), Stardust (Sdt), Discs large (Dlg), Scribble (Scrib) and Lethal giant larvae (Lgl) are involved in the establishment and the maintenance of apicobasal polarity in epithelial tissues. Because epithelial polarity is disrupted in tumors, human homologs of Drosophila crb, sdt, dlg, scrib, and lgl are potential cancer-associated genes. MPP1/EMP55, MPP2, MPP3, MPP4, MPP5/PALS1 and MPP6/PALS2 genes are human homologs of Drosoplila sdt. Here, we identified and characterized a novel member of MPP gene family, MPP7, by using bioinformatics. Uncharacterized FLJ32798 cDNAs (BC038105 and AK057360) were derived from human MPP7 gene. BC038105 was a representative MPP7 cDNA, while AK057360 was an aberrant MPP7 cDNA with a frame shift. Human MPP7 mRNA was expressed in placenta, brain, testis as well as in uterus tumor, bladder tumor, and lymphoma. Microsatellite marker D10S588, linked to IDDM and hereditary thrombocytopenia, was located within the MPP7 gene at human chromosome 10p12.1. Nucleotide sequence of mouse Mpp7 cDNA was determined in silico by assembling 3'-truncated cDNA AK078849, genome clone RP24-255J24, and EST AV260217. Human MPP7 showed 92.9% total-amino-acid identity with mouse Mpp7, and 75.7% total-amino-acid identity with zebrafish humpback. MPP7 orthologs were MAGUK proteins with two L27 domains, PDZ domain, SH3 domain, and GuKc domain. MPP7 was most related to MPP3 among MPP family members, functioning as adopter molecules assembling Crb homologs (CRB1, CRB3), Dlt homologs (INADL/PATJ, MPDZ/MUPP1), and Lin-7 homologs (LIN7A, LIN7B, LIN7C). This is the first report on identification and characterization of human MPP7 and mouse Mpp7 genes. PMID:14719143

Katoh, Masuko; Katoh, Masaru

2004-02-01

224

Aup1, a novel gene on mouse Chromosome 6 and human Chromosome 2p13  

SciTech Connect

We have cloned a novel mouse cDNA, Aup1, encoding a predicted protein of 410 amino acid residues. The 1.5-kb Aup1 transcript is ubiquitously expressed in mouse tissues. An evolutionary relationship to the Caenorhabditis elegans predicted protein F44b9.5 is indicated by the 35% identity and 53% conservation of the amino acid sequences. Nineteen related human ESTs spanning 80% of the protein have also been identified, with a predicted amino acid sequence identity of 86% between the human and the mouse proteins. The gene has been mapped to a conserved linkage group on human chromosome 2p13 and mouse Chromosome 6. Aup1 was eliminated as a candidate gene for two closely linked disorders, human LGMD2B and mouse mnd2. 15 refs., 2 figs.

Jang, Wonhee; Weber, J.S.; Meisler, M.H. [Univ. of Michigan, Ann Arbor, MI (United States)] [and others

1996-09-01

225

Expression patterns of imprinted gene Inpp5f - v3 during mouse brain development  

Microsoft Academic Search

Inpp5f-v3 is a transcriptional variant of Inpp5f (inositol polyphosphate-5-phosphatase F) and locates in distal mouse chromosome 7. It is a paternally expressed imprinted\\u000a gene in mouse. In this study, we examined the spatiotemporal patterns of Inpp5f-v3 gene during the mouse development. The northern blotting analysis revealed that only one transcript approx 2.7 kb of Inpp5f-v3 was detected in brain. The signals

Chen YanHe; He Hongjuan; Xing Yanjiang; Han Zhengbin; Li Kai; Zhang Fengwei; Hou Jing; Wu Qiong

2011-01-01

226

Chromosomal localization of the gene encoding the human DNA helicase RECQL and its mouse homologue  

SciTech Connect

We have determined the chromosomal location of the human and mouse genes encoding the RECQL protein, a putative DNA helicase homologous to the bacterial DNA helicase, RecQ. RECQL was localized to human chromosome 12 by analysis of human-rodent somatic cell hybrid DNA, fine mapping of RECQL by fluorescence in situ hybridization revealed its chromosomal location to be 12p11-p12. The corresponding mouse gene, Recql, was mapped to the telomeric end of mouse chromosome 6 by analysis of DNA from an interspecific cross. 19 refs., 2 figs.

Puranam, K.L.; Kennington, E.; Blackshear, P.J. [Duke Univ., Durham, NC (United States)] [and others

1995-04-10

227

Lgn1, a gene that determines susceptibility to Legionella pneumophila, maps to mouse chromosome 13  

SciTech Connect

The intracellular pathogen Legionella pneumophila is unable to replicate in macrophages derived from most inbred mouse strains. Here, we report the mapping of a gene, called Lgn1, that determines whether mouse macrophages are permissive for the intracellular replication of L. pneumophila. Although Lgn1 has been previously reported to map to mouse chromosome 15, we show here that it actually maps to chromosome 13, between D13Mit128 and D13Mit70. In the absence of any regional candidates for Lgn1, this map position will facilitate positional cloning attempts directed at this gene. 22 refs., 2 figs., 2 tabs.

Dietrich, W.F.; Damron, D.M.; Lander, E.S. [Whitehead Institute/MIT Genome Center, Cambridge, MA (United States)] [and others

1995-04-10

228

Distribution of the Mammalian Stat Gene Family in Mouse Chromosomes  

Microsoft Academic Search

Studies of transcriptional activation by interferons and a variety of cytokines have led to the identification of a family of proteins that serve as signal transducers and activators of transcription, Stats. Here, we report that the seven mouse Stat loci map in three clusters, with each cluster located on a different mouse autosome. The data suggest that the family has

Neal G. Copeland; Debra J. Gilbert; Chris Schindler; Zhong Zhong; Zilong Wen; James E. Darnell; Alice L.-F. Mui; Atsushi Miyajima; Frederick W. Quelle; James N. Ihle; Nancy A. Jenkins

1995-01-01

229

Localization of the synapsin II (SYN2) gene to human chromosome 3 and mouse chromosome 6  

SciTech Connect

The synapsins are a family of four synaptic vesicle-associated proteins, synapsins Ia, Ib, IIa, and IIb, that have been implicated in modulation of neurotransmitter release and in synaptogenesis . They are products from alternative splicing of two distinct genes, the synapsin I and synapsin II genes. The synapsin I (SYN1) gene has been mapped to the X chromosome in human and mouse. In this study, we have determined the chromosomal location of the synapsin II (SYN2) gene in both and human and mouse. 10 refs., 1 fig.

Lian Li; Lih-Shen Chin; Greengard, P. [Rockefeller Univ., New York, NY (United States)] [and others

1995-07-20

230

Gene suppression of mouse testis in vivo using small interfering RNA derived from plasmid vectors.  

PubMed

We evaluated whether inhibiting gene expression by small interfering RNA (siRNA) can be used for an in vivo model using a germ cell-specific gene (Tex101) as a model target in mouse testis. We generated plasmid-based expression vectors of siRNA targeting the Tex101 gene and transfected them into postnatal day 10 mouse testes by in vivo electroporation. After optimizing the electroporation conditions using a vector transfected into the mouse testis, a combination of high- and low-voltage pulses showed excellent transfection efficiency for the vectors with minimal tissue damage, but gene suppression was transient. Gene suppression by in vivo electroporation may be helpful as an alternative approach when designing experiments to unravel the basic role of testicular molecules. PMID:22489107

Takizawa, Takami; Ishikawa, Tomoko; Kosuge, Takuji; Mizuguchi, Yoshiaki; Sato, Yoko; Koji, Takehiko; Araki, Yoshihiko; Takizawa, Toshihiro

2011-12-28

231

Functional Conservation of Gsdma Cluster Genes Specifically Duplicated in the Mouse Genome  

PubMed Central

Mouse Gasdermin A3 (Gsdma3) is the causative gene for dominant skin mutations exhibiting alopecia. Mouse has two other Gsdma3-related genes, Gsdma and Gsdma2, whereas human and rat have only one related gene. To date, no skin mutation has been reported for human GSDMA and rat Gsdma as well as mouse Gsdma and Gsdma2. Therefore, it is possible that only Gsdma3 has gain-of-function type mutations to cause dominant skin phenotype. To elucidate functional divergence among the Gsdma-related genes in mice, and to infer the function of the human and rat orthologs, we examined in vivo function of mouse Gsdma by generating Gsdma knockout mice and transgenic mice that overexpress wild-type Gsdma or Gsdma harboring a point mutation (Alanine339Threonine). The Gsdma knockout mice shows no visible phenotype, indicating that Gsdma is not essential for differentiation of epidermal cells and maintenance of the hair cycle, and that Gsdma is expressed specifically both in the inner root sheath of hair follicles and in suprabasal cell layers, whereas Gsdma3 is expressed only in suprabasal layers. By contrast, both types of the transgenic mice exhibited epidermal hyperplasia resembling the Gsdma3 mutations, although the phenotype depended on the genetic background. These results indicate that the mouse Gsdma and Gsdma3 genes share common function to regulate epithelial maintenance and/or homeostasis, and suggest that the function of human GSDMA and rat Gsdma, which are orthologs of mouse Gsdma, is conserved as well.

Tanaka, Shigekazu; Mizushina, Youichi; Kato, Yoriko; Tamura, Masaru; Shiroishi, Toshihiko

2013-01-01

232

Potent hydroxyl radical-scavenging activity of drought-induced type-2 metallothionein in wild watermelon  

Microsoft Academic Search

Wild watermelon (Citrullus lanatus sp.) has the ability to tolerate severe drought\\/high light stress conditions despite carrying out normal C3-type photosynthesis. Here, mRNA differential display was employed to isolate drought-responsive genes in the leaves of wild watermelon. One of the isolated genes, CLMT2, shared significant homology with type-2 metallothionein (MT) sequences from other plants. The second-order rate constant for the

Kinya Akashi; Noriyuki Nishimura; Yoshinori Ishida; Akiho Yokota

2004-01-01

233

The Mouse PinkEyed Dilution Gene: Association with Human Prader-Willi and Angelman Syndromes  

Microsoft Academic Search

Complementary DNA clones from the pink-eyed dilution (p) locus of mouse chromosome 7 were isolated from murine melanoma and melanocyte libraries. The transcript from this gene is missing or altered in six independent mutant alleles of the p locus, suggesting that disruption of this gene results in the hypopigmentation phenotype that defines mutant p alleles. Characterization of the human homolog

John M. Gardner; Yoshimichi Nakatsu; Yoichi Gondo; Susan Lee; Mary F. Lyon; Richard A. King; Murray H. Brilliant

1992-01-01

234

LOCALIZATION OF THE MOUSE THYMIDINE KINASE GENE TO THE DISTAL PORTION OF CHROMOSOME 11  

EPA Science Inventory

We report the regional mapping of the thymidine kinase (tk-1) gene in the mouse using two complementary analyses: 1) investigation of chromosome aberrations associated with tx-1 gene inactivation in the L5178Y TX+/-3.7.2c cell line and (2) in situ molecular hybridization of a clo...

235

Comparative sequence analysis of imprinted genes between human and mouse to reveal imprinting signatures  

Microsoft Academic Search

We performed a comparative genomic sequence analysis between human and mouse for 24 imprinted genes on human chromosomes 1, 6, 7, 11, 13, 14, 15, 18, 19, and 20. The MEME program was used to search for motifs within conserved sequences among the imprinted genes and we then used the MAST program to analyze for the presence or absence of

Zhining Wang; Hongtao Fan; Howard H. Yang; Ying Hu; Kenneth H. Buetow; Maxwell P. Lee

2004-01-01

236

Plasmid-based gene transfer ameliorates visceral storage in a mouse model of Sandhoff disease  

Microsoft Academic Search

Sandhoff disease is a severe neurodegenerative disorder with visceral involvement caused by mutations in the HEXB gene coding for the g subunit of the lysosomal hexosaminidases A and B. HEXB mutations result in the accumulation of undegraded substrates such as GM2 and GA2 in lysosomes. We evaluated the efficacy of cationic liposome-mediated plasmid gene therapy using the Sandhoff disease mouse,

Akira Yamaguchi; Kayoko Katsuyama; Kyoko Suzuki; Kenji Kosaka; Ichiro Aoki; Shoji Yamanaka

2003-01-01

237

Cloning and characterization of human and mouse telomerase RNA gene promoter sequences  

Microsoft Academic Search

Variation in telomerase activity is correlated with cellular senescence and tumour progression. However, although the enzymatic activity of telomerase has been well studied, very little is known about how expression of telomerase genes is regulated in mammalian cells. We have therefore cloned the promoter regions of the human (hTR), and mouse, (terc), telomerase RNA genes in order to identify the

Jiang-Qin Zhao; Stacey F Hoare; Robert McFarlane; Sharon Muir; E Kenneth Parkinson; Donald M Black; W Nicol Keith

1998-01-01

238

A Mouse Homeo Box Gene is Expressed in Spermatocytes and Embryos  

Microsoft Academic Search

The MH-3 gene, which contains a homeo box that is expressed specifically in the adult testis, was identified and mapped to mouse chromosome 6. By means of in situ hybridization with adult testis sections and Northern blot hybridization with testis RNA from prepuberal mice and from Sl\\/Sld mutant mice, it was demonstrated that this gene is expressed in male germ

Michael R. Rubin; Leslie E. Toth; Mayuri D. Patel; Peter D'Eustachio; M. Chi Nguyen-Huu

1986-01-01

239

The Rab Protein Family: Genetic Mapping of Six Rab Genes in the Mouse  

Microsoft Academic Search

Rab proteins constitute a family of GTP-binding proteins that are located in distinct intracellular compartments and play a role in the regulation of vesicular trafficking. Yeast mutations in Rab gene homologs cause defects in vesicular transport similar to those observed in beige (bg) mice. To investigate Rab genes as candidates for mouse mutations characterized by defects in vesicular trafficking, we

Maria D. F. S. Barbosa; Steve A. Johnson; Karen Achey; Maria J. Gutierrez; Edward K. Wakeland; Marino Zerial; Stephen F. Kingsmore

1995-01-01

240

Expression of a novel mammalian epidermal growth factor-related gene during mouse neural development.  

PubMed

We have recently reported the preliminary characterisation of a novel EGF-related gene, Scube1 (signal peptide-CUB domain-EGF-related, gene 1), that is expressed prominently in the developing gonad, nervous system, somites, surface ectoderm and limb buds of the mouse. Here we describe the expression pattern of a closely related gene, Scube2 (also known as Cegp1), which maps to the distal region of mouse chromosome 7. Scube2 transcription is restricted to the embryonic neurectoderm but is also detectable in the adult heart, lung and testis. PMID:11287194

Grimmond, S; Larder, R; Van Hateren, N; Siggers, P; Morse, S; Hacker, T; Arkell, R; Greenfield, A

2001-04-01

241

The mouse X chromosome is enriched for multicopy testis genes showing postmeiotic expression.  

PubMed

According to the prevailing view, mammalian X chromosomes are enriched in spermatogenesis genes expressed before meiosis and deficient in spermatogenesis genes expressed after meiosis. The paucity of postmeiotic genes on the X chromosome has been interpreted as a consequence of meiotic sex chromosome inactivation (MSCI)--the complete silencing of genes on the XY bivalent at meiotic prophase. Recent studies have concluded that MSCI-initiated silencing persists beyond meiosis and that most genes on the X chromosome remain repressed in round spermatids. Here, we report that 33 multicopy gene families, representing approximately 273 mouse X-linked genes, are expressed in the testis and that this expression is predominantly in postmeiotic cells. RNA FISH and microarray analysis show that the maintenance of X chromosome postmeiotic repression is incomplete. Furthermore, X-linked multicopy genes exhibit a similar degree of expression as autosomal genes. Thus, not only is the mouse X chromosome enriched for spermatogenesis genes functioning before meiosis, but in addition, approximately 18% of mouse X-linked genes are expressed in postmeiotic cells. PMID:18454149

Mueller, Jacob L; Mahadevaiah, Shantha K; Park, Peter J; Warburton, Peter E; Page, David C; Turner, James M A

2008-05-04

242

Inducible Cre transgenic mouse strain for skeletal muscle-specific gene targeting  

PubMed Central

Background The use of the Cre/loxP system for gene targeting has been proven to be a powerful tool for understanding gene function. The purpose of this study was to create and characterize an inducible, skeletal muscle-specific Cre transgenic mouse strain. Methods To achieve skeletal muscle-specific expression, the human ?-skeletal actin promoter was used to drive expression of a chimeric Cre recombinase containing two mutated estrogen receptor ligand-binding domains. Results Western blot analysis, PCR and ?-galactosidase staining confirmed that Cre-mediated recombination was restricted to limb and craniofacial skeletal muscles only after tamoxifen administration. Conclusions A transgenic mouse was created that allows inducible, gene targeting of floxed genes in adult skeletal muscle of different developmental origins. This new mouse will be of great utility to the skeletal muscle community.

2012-01-01

243

Transgenic rats carrying the mouse renin gene—Morphological characterization of a low-renin hypertension model  

Microsoft Academic Search

Transgenic rats carrying the mouse renin gene—Morphological characterization of a low-renin hypertension model. Transgenic rats [TGR; strain name TGR(mRen2)27] harboring the mouse Ren-2 renin gene have been recently generated as a model for the study of primary hypertension that offers the advantage of a clearly-defined genetic alteration. Expression of the mouse Ren-2 gene causes severe hypertension (200 to 260 mm

Sebastian Bachmann; Jörg Peters; Eberhard Engler; Detlev Ganten; John Mullins

1992-01-01

244

A gene mapping to the sex-determining region of the mouse Y chromosome is a member of a novel family of embryonically expressed genes  

Microsoft Academic Search

A gene mapping to the sex-determining region of the mouse Y chromosome is deleted in a line of XY female mice mutant for Tdy, and is expressed at a stage during male gonadal development consistent with its having a role in testis determination. This gene is a member of a new family of at least five mouse genes, related by

John Gubbay; Jérôme Collignon; Peter Koopman; Blanche Capel; Androulla Economou; Andrea Münsterberg; Nigel Vivian; Peter Goodfellow; Robin Lovell-Badge

1990-01-01

245

Structure of 4-hydrophenylpyruvic acid dioxygenase (HPD) gene and its mutation in tyrosinemic mouse strain III  

SciTech Connect

4-Hydroxphenylpyruvic acid dioxygenase (HPD) is an important enzyme in tyrosine catabolism in most organisms. The activity of this enzyme is expressed mainly in the liver and is developmentally regulated in mammals. A genetic deficiency of the enzyme in man and mouse leads to hereditary tyrosinemia type 3. Using human HPD cDNA as a probe, a chromosomal gene related to HPD was isolated from human and mouse gene libraries. The human HPD gene is over 30 kilo-bases long and is split into 14 exons. Analysis of the 5{prime} flanking sequence of the gene suggests that expression of the gene is regulated by hepatocyte-specific and liver-enriched transcription factors, as well as by hormones. These features of the 5{prime} flanking region of the gene are similar to those of other genes which are specifically expressed in hepatocytes and which are developmentally regulated. The gene for mouse HPD has a similar structure and we obtained evidence for a nucleotide substitution which generates a termination codon in exon 7 of the HPD gene in III mice. This mutation associates a partial exon skipping and most of the mRNA lacks sequences corresponding to exon 7. The partial exon skipping apparently is the result of a nonsense mutation in the exon. Thus, mouse strain III can serve as a genetic model for human tyrosinemia type 3. Ongoing studies are expected to elucidate the disease process involved in hereditary tyrosinemia type 1 and to shed light on mechanisms that mediate developmental regulation of HPD gene expression. In addition, mouse strain III together with recently established models for tyrosinemia type 1 will facilitate studies on hereditary tyrosinemias.

Awata, H.; Endo, F.; Matsuda, I. [Kumamoto Univ. Medical School (Japan)] [and others

1994-09-01

246

MOUSE  

NSDL National Science Digital Library

Based in New York City, the MOUSE organization works to empower "underserved students to provide technology support and leadership in their schools, supporting their academic and career success." On their homepage, visitors can learn about their programs, learn about supporting the MOUSE organization, and read up on their resources. In the "Resources" area, visitors can learn about their outreach activities in New York City, Chicago, and California. Visitors working in educational outreach will appreciate the information offered here, including materials on how different groups can receive assistance from the MOUSE organization. Also, visitors can look over the "News" updates to learn about their new programs, their educational seminars, and their outreach activities.

247

Identifying novel genes for atherosclerosis through mouse-human comparative genetics.  

PubMed

Susceptibility to atherosclerosis is determined by both environmental and genetic factors. Its genetic determinants have been studied by use of quantitative-trait-locus (QTL) analysis. So far, 21 atherosclerosis QTLs have been identified in the mouse: 7 in a high-fat-diet model only, 9 in a sensitized model (apolipoprotein E- or LDL [low-density lipoprotein] receptor-deficient mice) only, and 5 in both models, suggesting that different gene sets operate in each model and that a subset operates in both. Among the 27 human atherosclerosis QTLs reported, 17 (63%) are located in regions homologous (concordant) to mouse QTLs, suggesting that these mouse and human atherosclerosis QTLs have the same underlying genes. Therefore, genes regulating human atherosclerosis will be found most efficiently by first finding their orthologs in concordant mouse QTLs. Novel mouse QTL genes will be found most efficiently by using a combination of the following strategies: identifying QTLs in new crosses performed with previously unused parental strains; inducing mutations in large-scale, high-throughput mutagenesis screens; and using new genomic and bioinformatics tools. Once QTL genes are identified in mice, they can be tested in human association studies for their relevance in human atherosclerotic disease. PMID:15931593

Wang, Xiaosong; Ishimori, Naoki; Korstanje, Ron; Rollins, Jarod; Paigen, Beverly

2005-05-19

248

Identifying Novel Genes for Atherosclerosis through Mouse-Human Comparative Genetics  

PubMed Central

Susceptibility to atherosclerosis is determined by both environmental and genetic factors. Its genetic determinants have been studied by use of quantitative-trait–locus (QTL) analysis. So far, 21 atherosclerosis QTLs have been identified in the mouse: 7 in a high-fat–diet model only, 9 in a sensitized model (apolipoprotein E– or LDL [low-density lipoprotein] receptor–deficient mice) only, and 5 in both models, suggesting that different gene sets operate in each model and that a subset operates in both. Among the 27 human atherosclerosis QTLs reported, 17 (63%) are located in regions homologous (concordant) to mouse QTLs, suggesting that these mouse and human atherosclerosis QTLs have the same underlying genes. Therefore, genes regulating human atherosclerosis will be found most efficiently by first finding their orthologs in concordant mouse QTLs. Novel mouse QTL genes will be found most efficiently by using a combination of the following strategies: identifying QTLs in new crosses performed with previously unused parental strains; inducing mutations in large-scale, high-throughput mutagenesis screens; and using new genomic and bioinformatics tools. Once QTL genes are identified in mice, they can be tested in human association studies for their relevance in human atherosclerotic disease.

Wang, Xiaosong; Ishimori, Naoki; Korstanje, Ron; Rollins, Jarod; Paigen, Beverly

2005-01-01

249

The neuronal nicotinic acetylcholine receptor {alpha}7 subunit gene: Cloning, mapping, structure, and targeting in mouse  

SciTech Connect

The neuronal nicotinic acetylcholine receptor {alpha}7 subunit is a member of a family of ligand-gated ion channels, and is the only subunit know to bind {alpha}-bungarotoxin in mammalian brain. {alpha}-Bungarotoxin binding sites are known to be more abundant in the hippocampus of mouse strains that are particularly sensitive to nicotine-induced seizures. The {alpha}7 receptor is highly permeable to calcium, which could suggest a role in synaptic plasticity in the nervous system. Auditory gating deficiency, an abnormal response to a second auditory stimulus, is characteristic of schizophrenia. Mouse strains that exhibit a similar gating deficit have reduced hippocampal expression of the {alpha}7 subunit. We have cloned and sequenced the full length cDNA for the mouse {alpha}7 gene (Acra-7) and characterized its gene structure. The murine {alpha}7 shares amino acid identity of 99% and 93% with the rat and human {alpha}7 subunits, respectively. Using an interspecies backcross panel, the murine gene was mapped to chromosome 7 near the p locus, a region syntenic with human chromosome 15; the human gene (CHRNA7) was confirmed to map to 15q13-q14 by FISH. To generate a mouse {alpha}7 mutant by homologous recombination, we have constructed a replacement vector which will delete transmembrane domains II-IV and the cytoplasmic domain from the gene product. Recombinant embryonic stem (ES) cell clones were selected and used to develop mouse chimeras that are currently being bred to obtain germline transmission.

Orr-Urtreger, A.; Baldini, A.; Beaudet, A.L. [Howard Hughes Medical Institute, Houston, TX (United States)] [and others

1994-09-01

250

[The cloning and expression of a novel mouse gene mLPTS and its subcellular localization].  

PubMed

A novel mouse gene mLPTS was cloned by EST assembling, RT-PCR and DNA sequencing. The gene fragment for mLPTS is 1244 bp in length, encoding a protein of 332 amino acids. The amino acid sequence of mLPTS has 78% homologue with that of LPTS gene, which is a novel liver cancer-related gene identified through positional candidate cloning stratage by our laboratory. The expression of LPTS gene was ubiquitous in normal human tissues, whereas levels appeared to be significantly reduced, or sometime undetectable in HCC cells and neoplastic tissues, and it might be involved in the negative regulation of cell proliferation. The expression of mLPTS gene was found in all mouse tissues analyzed, same with that of LPTS gene in human. There was only one transcript for mLPTS gene in mouse tissues. The phylogenetic tree was constructed through the amino acids sequence analysis and the study of the sequence homologue among different species. Next, mLPTS gene was cloned into green fluorescent protein eukarytic expression vector and then transfected into CHO cell line. The green fluorescent was mostly limited in the nucleolus, showing that the gene products of mLPTS in eukaryocytes were located in the nucleolus. PMID:12561469

Liao, Cheng; Zhao, Mu-Jun; Li, Zai-Ping

2002-10-01

251

Cellular Genes in the Mouse Regulate IN TRANS the Expression of Endogenous Mouse Mammary Tumor Viruses  

PubMed Central

The transcriptional activities of the eleven mouse mammary tumor virus (MMTV) proviruses endogenous to two sets of recombinant inbred (RI) mouse strains, BXD and BXH, were characterized. Comparison of the levels of virus-specific RNA quantitated in each strain showed no direct relationship between the presence of a particular endogenous provirus or with increasing numbers of proviruses. Association of specific genetic markers with the level of MMTV-specific RNA was examined by using multiple regression analysis. Several cellular loci as well as proviral loci were identified that were significantly associated with viral expression. Importantly, these cellular loci associated with MMTV expression segregated independently of viral sequences.

Traina-Dorge, Vicki L.; Carr, Jean K.; Bailey-Wilson, Joan E.; Elston, Robert C.; Taylor, Benjamin A.; Cohen, J. Craig

1985-01-01

252

High-throughput trapping of secretory pathway genes in mouse embryonic stem cells.  

PubMed

High-throughput gene trapping is a random approach for inducing insertional mutations across the mouse genome. This approach uses gene trap vectors that simultaneously inactivate and report the expression of the trapped gene at the insertion site, and provide a DNA tag for the rapid identification of the disrupted gene. Gene trapping has been used by both public and private institutions to produce libraries of embryonic stem (ES) cells harboring mutations in single genes. Presently, approximately 66% of the protein coding genes in the mouse genome have been disrupted by gene trap insertions. Among these, however, genes encoding signal peptides or transmembrane domains (secretory genes) are underrepresented because they are not susceptible to conventional trapping methods. Here, we describe a high-throughput gene trapping strategy that effectively targets secretory genes. We used this strategy to assemble a library of ES cells harboring mutations in 716 unique secretory genes, of which 61% were not trapped by conventional trapping, indicating that the two strategies are complementary. The trapped ES cell lines, which can be ordered from the International Gene Trap Consortium (http://www.genetrap.org), are freely available to the scientific community. PMID:16478711

De-Zolt, Silke; Schnütgen, Frank; Seisenberger, Claudia; Hansen, Jens; Hollatz, Melanie; Floss, Thomas; Ruiz, Patricia; Wurst, Wolfgang; von Melchner, Harald

2006-02-13

253

Human and mouse Krüppel-like (MOK2) orthologue genes encode two different zinc finger proteins  

Microsoft Academic Search

We have isolated the human homologue of Mok2 gene encoding a Kriippel-like protein. The identification of three cDNAs and genomic clones reveals that the human protein shows substantial structural differences with the mouse MOK2 protein. The mouse MOK2 protein is composed of seven tandem zinc-finger motifs with five additional amino acids at the COOH-terminal. This structural feature is also present

Michèle Ernoult-Lange; Valérie Arranz; Maryvonne Coniat; Roland Berger; Michel Kress

1995-01-01

254

DNA-Mediated gene transfection into primary cultures of adult mouse keratinocytes  

Microsoft Academic Search

Summary  An efficient and reproducible technique for the transfection of primary cultures of adult mouse keratinocytes has been developed.\\u000a The procedure involves culturing the primary adult mouse epidermal cells at 32° C in an enriched media until they reach 70\\u000a to 95% confluency, followed by transfection with exogenous DNA in a low potassium environment. Using chloramphenicol acetyl\\u000a transferase (CAT) transient gene

Natalie A. Betz; Ken J. Wolterman; John J. Reiners; Jill C. Pelling

1992-01-01

255

Isolation and initial characterization of the mouse Dnmt3l gene  

Microsoft Academic Search

We have isolated and sequenced the mouse zinc finger gene, Dnmt3l (DNA cytosine-5-methyltransferase 3-like), on mouse chromosome 10, showing similarity to members of the DNMT3\\/Dnmt3 family. The Dnmt3l protein contains an ADD zinc finger, which Dnmt3l shares with other Dnmt3 family members and Atrx. RT-PCR analysis showed Dnmt3l expression in testis, thymus, ovary, and heart, as well as in 7-day,

U. Aapola; R. Lyle; K. Krohn; S. E. Antonarakis; P. Peterson

2001-01-01

256

Salivary proline-rich protein genes on chromosome 8 of mouse  

SciTech Connect

Endonuclease restriction (Hind III) fragments of DNA from Chinese hamster x mouse somatic cell hybrids hybridized with proline-rich protein complementary DNA clones only when the DNA was isolated from cells containing mouse chromosome 8, or a fragment of chromosome 8. The evidence suggests that proline-rich protein genes are located at the proximal portion of chromosome 8 toward the centromere. 27 references, 1 figure, 1 table.

Azen, E.A.; Carlson, D.M.; Clements, S.; Lalley, P.A.; Vanin, E.

1984-11-23

257

Expression profile of active genes in mouse lymph node high endothelial cells  

Microsoft Academic Search

High endothelial venules (HEV) allow rapid and selective lymphocyte trafficking from the blood into secondary lymphoid tissues. Here we report the expression profile of active genes in mouse high endothelial cells (HEC). HEC were first purified from mouse lymph nodes (LN) by magnetic cell sorting with MECA-79 mAb and a 3-directed cDNA library that faithfully represents the composition of mRNA

Dai Izawa; Toshiyuki Tanaka; Koichi Saito; Hideki Ogihara; Takeo Usui; Shoko Kawamoto; Kenichi Matsubara; Kosaku Okubo; Masayuki Miyasaka

1999-01-01

258

Immunohistochemical localization of metallothionein in plant tissues  

Microsoft Academic Search

The localization of metallothionein ( MT ) in the seeds and roots of soybean was investigated by immunohistochemistry. The germinating seeds at 2 hr, 1, 2, 3, 4 and 6 d including 1-mo root tips of soybean ( c.v. Toyosuzu ) with and without heavy metals ( Cu 400 µg Lor Zn 3 µg ml-1) treatment were used to demonstrate

Praphasri Chongpraditnun; Keiji Suzuki; Umeko Kawaharada; Katsuyuki Nakajima; Mitsuo Chino

1991-01-01

259

The Bysl Gene Product, Bystin, is Essential for Survival of Mouse Embryos.  

PubMed Central

Human bystin is a cytoplasmic protein directly binding to trophinin, a cell adhesion molecule potentially involved in human embryo implantation. The present study shows that bystin is expressed in luminal and glandular epithelia in the mouse uterus at peri-implantation stages. In fertilized embryos, bystin was not seen until blastocyst stage. Bystin expression started during hatching and increased in expanded blastocyst. However, bystin disappeared from the blastocyst during implantation. After implantation bystin re-appeared in the epiblast. Targeted disruption of the mouse bystin gene, Bysl, resulted in embryonic lethality shortly after implantation, indicating that bystin is essential for survival of mouse embryos.

Aoki, Rui; Suzuki, Nao; Paria, Bibhash C.; Sugihara, Kazuhiro; Akama, Tomoya O.; Raab, Gerhard; Miyoshi, Masaya; Nadano, Daita; Fukuda, Michiko N.

2006-01-01

260

Digital Gene Expression Tag Profiling Analysis of the Gene Expression Patterns Regulating the Early Stage of Mouse Spermatogenesis  

PubMed Central

Detailed characterization of the gene expression patterns in spermatogonia and primary spermatocytes is critical to understand the processes which occur prior to meiosis during normal spermatogenesis. The genome-wide expression profiles of mouse type B spermatogonia and primary spermatocytes were investigated using the Solexa/Illumina digital gene expression (DGE) system, a tag based high-throughput transcriptome sequencing method, and the developmental processes which occur during early spermatogenesis were systematically analyzed. Gene expression patterns vary significantly between mouse type B spermatogonia and primary spermatocytes. The functional analysis revealed that genes related to junction assembly, regulation of the actin cytoskeleton and pluripotency were most significantly differently expressed. Pathway analysis indicated that the Wnt non-canonical signaling pathway played a central role and interacted with the actin filament organization pathway during the development of spermatogonia. This study provides a foundation for further analysis of the gene expression patterns and signaling pathways which regulate the molecular mechanisms of early spermatogenesis.

Meng, Lijun; Liu, Meiling; Zhao, Lina; Hu, Fen; Ding, Cunbao; Wang, Yang; He, Baoling; Pan, Yuxin; Fang, Wei; Chen, Jing; Hu, Songnian; Jia, Mengchun

2013-01-01

261

Activity of Metal-Responsive Transcription Factor 1 by Toxic Heavy Metals and H2O2 In Vitro Is Modulated by Metallothionein  

PubMed Central

Metallothioneins are small, cysteine-rich proteins that avidly bind heavy metals such as zinc, copper, and cadmium to reduce their concentration to a physiological or nontoxic level. Metallothionein gene transcription is induced by several stimuli, notably heavy metal load and oxidative stress. Transcriptional induction of metallothionein genes is mediated by the metal-responsive transcription factor 1 (MTF-1), an essential zinc finger protein that binds to specific DNA motifs termed metal-response elements. In cell-free DNA binding reactions with nuclear extracts, MTF-1 requires elevated zinc concentrations for efficient DNA binding but paradoxically is inactivated by other in vivo inducers such as cadmium, copper, and hydrogen peroxide. Here we have developed a cell-free, MTF-1-dependent transcription system which accurately reproduces the activation of metallothionein gene promoters not only by zinc but also by these other inducers. We found that while transcriptional induction by zinc can be achieved by elevated zinc concentration alone, induction by cadmium, copper, or H2O2 additionally requires the presence of zinc-saturated metallothionein. This is explained by the preferential binding of cadmium or copper to metallothionein or its oxidation by H2O2; the concomitant release of zinc in turn leads to the activation of transcription factor MTF-1. Conversely, thionein, the metal-free form of metallothionein, inhibits activation of MTF-1. The release of zinc from cellular components, including metallothioneins, and the sequestration of zinc by newly produced apometallothionein might be a basic mechanism to regulate MTF-1 activity upon cellular stress.

Zhang, Bo; Georgiev, Oleg; Hagmann, Michael; Gunes, Cagatay; Cramer, Mirjam; Faller, Peter; Vasak, Milan; Schaffner, Walter

2003-01-01

262

The mouse lysosomal membrane protein 1 gene as a candidate for the motorneuron degeneration (mnd) locus  

SciTech Connect

The motorneuron degeneration (mnd) mutation causes one of the few late-onset progressive neurodegenerations in mice; therefore, the mnd mouse is a valuable paradigm for studying neurodegenerative biology. The mnd mutation may also model human neuronal ceroid lipofuscinosis (NCL) or Batten disease. Mnd maps to the centromeric region of mouse chromosome 8, which likely corresponds to portions of human chromosomes 13,8, or 19; we note that the chromosome 13 portion maps close to a region thought to contain the human Type V NCL locus. We have identified candidate genes for the mnd locus from human chromosomes 13, 8, and 19, and we are mapping these genes in the mouse to determine their proximity to the mutated locus and to refine the comparative human-mouse map in this area. A candidate gene from human chromosome 13 is LAMP1, which encodes lysosomal membrane protein 1. We found that Lamp1 in the mouse lies within the region of the mnd mutation. Therefore, we sequenced Lamp1 cDNAs from homozygous mnd mice and unrelated wildtype C57BL/6 mice. We find no differences between the two cDNA species in the regions examined, and expression analysis shows a similar LAMP1 protein distribution in wildtype and mutant mice, suggesting that an abnormal accumulation of material within normal lysosome structures is unlikely to be the pathogenetic mechanism in the mnd mouse. 19 refs., 3 figs.

Bermingham, N.A.; Martin, J.E.; Fisher, E.M.C. [Imperial College of Medicine at St. Mary`s, London (United Kingdom)

1996-03-01

263

Retroviral endogenous transcripts related to the envelope gene of friend spleen focus-forming virus in normal mouse tissues  

Microsoft Academic Search

Summary Retroviral endogenous sequences related to the envelope (env) gene of Friend spleen focus forming virus (SFFV) and of mink cell focus forming viruses (MCF) are present in the genome of various mouse strains. We have examined the transcription of these SFFV\\/MCF-related sequences in normal tissues of two mouse strains, ICFW and DBA\\/2. Cytoplasmic Poly A+ RNAs of normal mouse

J. Robert-Lezenes; F. Moreau-Gachelin; P. Meneceur; P. Tambourin

1986-01-01

264

Use of NF1 and NF2 Mutant Mouse Strains in the Investigation of Gene Function and Disease Development.  

National Technical Information Service (NTIS)

Mouse strains carrying germline mutations in the NFl and NF2 tumor suppressor genes have been used as mouse models for human neurofibromatosis types 1 and 2. Progress over the past 3 years has included the generation of three mouse models of NF1. These mo...

J. Tyler

2000-01-01

265

Integrative transcriptional analysis between human and mouse cancer cells provides a common set of transformation associated genes  

Microsoft Academic Search

Mouse functional genomics is largely used to investigate relevant aspects of mammalian physiology and pathology. To which degree mouse models may offer accurate representations of molecular events underlining human diseases such as cancer is not yet fully established. Herein we compare gene expression signatures between a set of human cancer cell lines (NCI-60 cell collection) and a mouse cellular model

C. Balestrieri; M. Vanoni; S. Hautaniemi; L. Alberghina; F. Chiaradonna

266

A type VII myosin encoded by the mouse deafness gene shaker-1  

Microsoft Academic Search

GENETIC deafness is common, affecting about 1 in 2,000 births1. Many of these show primary abnormalities of the sensory neuro-epithelia of the inner ear, as do several hearing-impaired mouse mutants, suggesting that genes involved in sensory transduction could be affected. Here we report the identification of one such gene, the mouseshaker-1(shl) gene. Shaker-1 homozygotes show hyperactivity, head-tossing and circling due

F. Gibson; J. Walsh; P. Mburu; A. Varela; K. A. Brown; M. Antonio; K. W. Beisel; K. P. Steel; S. D. M. Brown

1995-01-01

267

A global view of gene expression in the preimplantation mouse embryo: morula versus blastocyst  

Microsoft Academic Search

As a first step to understand preimplantation development, we performed global gene-expression profiling of morula and blastocyst using the NIA 15k mouse cDNA microarray. Gene expression levels were measured four times for blastocyst and five times for morula. Student’s t-test at the 5% significance level identified 428 genes upregulated and 748 downregulated in blastocyst compared to morula. This trend was

Tetsuya S Tanaka; Minoru S. H Ko

2004-01-01

268

Human and mouse orthologs of a new ATP-binding cassette gene, ABCG4  

Microsoft Academic Search

We characterized a new ATP-binding cassette (ABC) transporter gene from human and mouse that is highly expressed in the brain. The gene, ABCG4, produces several transcripts that differ at the 5? end and encode proteins of various lengths. The ABCG4 protein is closely related to the Drosophila white and human ABCG1 genes, and belongs to the ABCG subfamily several members

T. Annilo; J. Tammur; A. Hutchinson; A. Rzhetsky; M. Dean; R. Allikmets

2001-01-01

269

Assessment of orthologous splicing isoforms in human and mouse orthologous genes  

PubMed Central

Background Recent discoveries have highlighted the fact that alternative splicing and alternative transcripts are the rule, rather than the exception, in metazoan genes. Since multiple transcript and protein variants expressed by the same gene are, by definition, structurally distinct and need not to be functionally equivalent, the concept of gene orthology should be extended to the transcript level in order to describe evolutionary relationships between structurally similar transcript variants. In other words, the identification of true orthology relationships between gene products now should progress beyond primary sequence and "splicing orthology", consisting in ancestrally shared exon-intron structures, is required to define orthologous isoforms at transcript level. Results As a starting step in this direction, in this work we performed a large scale human- mouse gene comparison with a twofold goal: first, to assess if and to which extent traditional gene annotations such as RefSeq capture genuine splicing orthology; second, to provide a more detailed annotation and quantification of true human-mouse orthologous transcripts defined as transcripts of orthologous genes exhibiting the same splicing patterns. Conclusions We observed an identical exon/intron structure for 32% of human and mouse orthologous genes. This figure increases to 87% using less stringent criteria for gene structure similarity, thus implying that for about 13% of the human RefSeq annotated genes (and about 25% of the corresponding transcripts) we could not identify any mouse transcript showing sufficient similarity to be confidently assigned as a splicing ortholog. Our data suggest that current gene and transcript data may still be rather incomplete - with several splicing variants still unknown. The observation that alternative splicing produces large numbers of alternative transcripts and proteins, some of them conserved across species and others truly species-specific, suggests that, still maintaining the conventional definition of gene orthology, a new concept of "splicing orthology" can be defined at transcript level.

2010-01-01

270

A gene atlas of the mouse and human protein-encoding transcriptomes  

Microsoft Academic Search

The tissue-specific pattern of mRNA expression can indicate important clues about gene function. High-density oligonucleotide arrays offer the opportunity to examine patterns of gene expression on a genome scale. Toward this end, we have designed custom arrays that interrogate the expression of the vast majority of protein-encoding human and mouse genes and have used them to profile a panel of

Andrew I. Su; Tim Wiltshire; Serge Batalov; Hilmar Lapp; Keith A. Ching; David Block; Jie Zhang; Richard Soden; Mimi Hayakawa; Gabriel Kreiman; Michael P. Cooke; John R. Walker; John B. Hogenesch

2004-01-01

271

Expression of a novel mammalian epidermal growth factor-related gene during mouse neural development  

Microsoft Academic Search

We have recently reported the preliminary characterisation of a novel EGF-related gene, Scube1 (signal peptide-CUB domain-EGF-related, gene 1), that is expressed prominently in the developing gonad, nervous system, somites, surface ectoderm and limb buds of the mouse. Here we describe the expression pattern of a closely related gene, Scube2 (also known as Cegp1), which maps to the distal region of

Sean Grimmond; Rachel Larder; Nick Van Hateren; Pam Siggers; Sue Morse; Terry Hacker; Ruth Arkell; Andy Greenfield

2001-01-01

272

Uncoupling of transcription and translation during zygotic gene activation in the mouse.  

PubMed Central

Zygotic gene expression in mice is delayed by a time-dependent mechanism until the two-cell stage in development. To investigate the basis of this 'zygotic clock', the firefly luciferase gene was injected into mouse embryos, and quantitative assays were used to monitor luciferase gene transcription and translation in individual embryos from single mothers. These studies confirmed, at the mRNA level, previous conclusions about the relative capacities of paternal and maternal pronuclei to transcribe genes, and the requirements for promoters and enhancers during zygotic gene activation. Furthermore, these studies revealed that fertilized mouse eggs can delay expression of zygotic genes by uncoupling translation from transcription. An RNA polymerase II-dependent gene could be translated until zygotic gene expression began (a delay of up to 15 h after injection). The time course for nascent mRNA accumulation was biphasic, with the second phase occurring during zygotic gene expression. If the luciferase gene was injected after zygotic gene expression had begun, then translation was tightly linked to transcription. If the second phase of mRNA accumulation was repressed, then luciferase was not produced. Therefore, translation was linked to the accumulation of mRNA during the onset of zygotic gene expression. Similar biphasic time courses also were observed for RNA polymerase I- and III-dependent transcription. These and other results reveal that the zygotic clock regulates the onset of both transcription and translation of zygotic genes. Images

Nothias, J Y; Miranda, M; DePamphilis, M L

1996-01-01

273

Cell Cycle Genes in a Mouse Mammary Hyperplasia Model  

Microsoft Academic Search

Human mammary epithelial cells emerge spontaneously from senescence, exhibiting eroding telomeric sequences, and ultimately enter crisis to generate the type of chromosomal abnormalities seen in early stages of breast cancer. In a mouse mammary tumor model, the spontaneous escape of senescence can be observed as an increase in DNA synthesis that is reflected by alterations in the cell cycle profile

Thenaa K. Said; Daniel Medina

2004-01-01

274

Gene targeting using a mouse HPRT minigene/HPRT-deficient embryonic stem cell system: inactivation of the mouse ERCC-1 gene.  

PubMed

A convenient system for gene targeting that uses hypoxanthine phosphoribosyltransferase (HPRT) minigenes as the selectable marker in HPRT-deficient mouse embryonic stem (ES) cells is described. Improvements to the expression of HPRT minigenes in ES cells were achieved by promoter substitution and the provision of a strong translational initiation signal. The use of minigenes in the positive-negative selection strategy for gene targeting was evaluated and the smaller minigenes were found to be as effective as a more conventional marker--the herpes simplex virus thymidine kinase gene. Minigenes were used to target the DNA repair gene ERCC-1 in ES cells. A new HPRT-deficient ES cell line was developed that contributes with high frequency to the germ line of chimeric animals. The ability to select for and against HPRT minigene expression in the new HPRT-deficient ES cell line will make this system useful for a range of gene-targeting applications. PMID:1440055

Selfridge, J; Pow, A M; McWhir, J; Magin, T M; Melton, D W

1992-07-01

275

Cloning and sequence analysis of the mouse smooth muscle {gamma}-enteric actin gene  

SciTech Connect

Actin represents one of the most highly conserved families of proteins in evolution. The work presented here describes the molecular characterization of the mouse smooth muscle (enteric) {gamma}-actin gene (SMGA). It represents the largest isoactin gene characterized to date, measuring over 23,000 bp from the transcription start site to the polyadenylation signal. The gene is divided into nine exons and encodes a mature actin protein of 374 amino acids. Putative regulatory elements are noted as well as regions of the gene that have the potential to form non-B DNA conformations that may influence gene expression. 48 refs., 5 figs., 3 tabs.

Szucsik, J.C.; Lessard, J.L. [Children`s Hospital Research Foundation, Cincinnati, OH (United States)

1995-07-20

276

High-resolution gene expression atlases for adult and developing mouse brain and spinal cord.  

PubMed

Knowledge of the structure, genetics, circuits, and physiological properties of the mammalian brain in both normal and pathological states is ever increasing as research labs worldwide probe the various aspects of brain function. Until recently, however, comprehensive cataloging of gene expression across the central nervous system has been lacking. The Allen Institute for Brain Science, as part of its mission to propel neuroscience research, has completed several large gene-mapping projects in mouse, nonhuman primate, and human brain, producing informative online public resources and tools. Here we present the Allen Mouse Brain Atlas, covering ~20,000 genes throughout the adult mouse brain; the Allen Developing Mouse Brain Atlas, detailing expression of approximately 2,000 important developmental genes across seven embryonic and postnatal stages of brain growth; and the Allen Spinal Cord Atlas, revealing expression for ~20,000 genes in the adult and neonatal mouse spinal cords. Integrated data-mining tools, including reference atlases, informatics analyses, and 3-D viewers, are described. For these massive-scale projects, high-throughput industrial techniques were developed to standardize and reliably repeat experimental goals. To verify consistency and accuracy, a detailed analysis of the 1,000 most viewed genes for the adult mouse brain (according to website page views) was performed by comparing our data with peer-reviewed literature and other databases. We show that our data are highly consistent with independent sources and provide a comprehensive compendium of information and tools used by thousands of researchers each month. All data and tools are freely available via the Allen Brain Atlas portal (www.brain-map.org). PMID:22832508

Henry, Alex M; Hohmann, John G

2012-07-26

277

Cloning, tissue expression, and chromosomal location of the mouse insulin receptor substrate 4 gene.  

PubMed

The insulin receptor substrates (IRSs) are key proteins in signal transduction from the insulin receptor. Recently, we discovered a fourth member of this family, designated IRS-4, cloned its complementary DNA from the human embryonic kidney 293 cell line, and characterized its signaling properties in this cell line. As part of an investigation of the physiological role of this IRS, we have now cloned the mouse IRS-4 gene and determined its tissue expression and chromosomal location. The coding region of the mouse IRS-4 gene contains no introns, and in this regard is the same as that of the genes for IRS-1 and -2. The predicted amino acid sequence of mouse IRS-4 is highly homologous with that of human IRS-4; the pleckstrin homology domain, the phosphotyrosine-binding domain, and the tyrosine phosphorylation motifs are especially well conserved. The tissue distribution of IRS-4 in the mouse was determined by analysis for the expression of its messenger RNA by RT-PCR and for the protein itself by immunoprecipitation and immunoblotting. The messenger RNA was detected in skeletal muscle, brain, heart, kidney, and liver, but the protein itself was not detected in any tissue. These results indicate that IRS-4 is a very rare protein. The chromosomal locations of the mouse IRS-4 and IRS-3 genes were determined by interspecific back-cross analysis and were found to be on chromosomes X and 5, respectively. As the mouse genes for IRS-1 and -2 are on chromosomes 1 and 8, respectively, each IRS gene resides on a different chromosome. PMID:10067860

Fantin, V R; Lavan, B E; Wang, Q; Jenkins, N A; Gilbert, D J; Copeland, N G; Keller, S R; Lienhard, G E

1999-03-01

278

Construction of a mouse model of factor VIII deficiency by gene targeting  

SciTech Connect

To develop a small animal model of hemophilia A for gene therapy experiments, we set out to construct a mouse model for factor VIII deficiency by gene targeting. First, we screened a mouse liver cDNA library using a human FVIII cDNA probe. We cloned a 2.6 Kb partial mouse factor VIII cDNA which extends from 800 base pairs of the 3{prime} end of exon 14 to the 5{prime} end of exon 26. A mouse genomic library made from strain 129 was then screened to obtain genomic fragments covering the exons desired for homologous recombination. Two genomic clones were obtained, and one covering exon 15 through 22 was used for gene targeting. To make gene targeting constructs, a 5.8 Kb genomic DNA fragment covering exons 15 to 19 of the mouse FVIII gene was subcloned, and the neo expression cassette was inserted into exons 16 and 17 separately by different strategies. These two constructs were named MFVIIIC-16 and MFVIIIC-17. The constructs were linearized and transfected into strain 129 mouse ES cells by electroporation. Factor VIII gene-knockout ES cell lines were selected by G-418 and screened by genomic Southern blots. Eight exon 16 targeted cell lines and five exon 17 targeted cell lines were obtained. Three cell lines from each construct were injected into blastocysts and surgically transferred into foster mothers. Multiple chimeric mice with 70-90% hair color derived from the ES-cell genotype were seen with both constructs. Germ line transmission of the ES-cell genotype has been obtained for the MFVIIIC-16 construct, and multiple hemophilia A carrier females have been identified. Factor VIII-deficient males will be conceived soon.

Bi, L.; Lawler, A.; Gearhart, J. [Univ. of Pennsylvania School of Medicine, Philadelphia, PA (United States)] [and others

1994-09-01

279

Regulation of the mouse gene encoding TAFI by TNF?: role of NF?B binding site.  

PubMed

Thrombin-activable fibrinolysis inhibitor (TAFI) is a plasma pro-carboxypeptidase, encoded by the gene CPB2, with roles in both inhibition of fibrinolysis and inflammation. In mice, plasma TAFI levels and hepatic CPB2 mRNA expression were found to increase within 24h after intra-peritoneal lipopolysaccharide (LPS) injection. On the other hand, plasma TAFI in humans decrease in experimental endotoxemia and sepsis and we have previously demonstrated that CPB2 mRNA abundance in human hepatoma cells is decreased by inflammatory cytokines. Here, we have evaluated the effects of TNF? on mouse CPB2 expression. Treatment of primary mouse hepatocytes or the mouse hepatic cell line FL83B with TNF? for 12-48h resulted in increases in CPB2 mRNA abundance of up to 2-fold; mouse TAFI protein levels secreted from FL83B cells increased 2.7-fold after 48h treatment with TNF?. When FL83B cells were transfected with reporter plasmids containing the mouse CPB2 5'-flanking region, treatment with TNF? for 24 and 48h resulted in a 1.5-fold increased mouse CPB2 promoter activity. Mutation of a putative NF?B site not conserved in the human gene ablated the increased promoter activity observed following TNF? treatment. This site binds NF?B as assessed by gel mobility shift assays, and TNF? treatment increases the translocation of NF?B from the cytoplasm to the nucleus of mouse hepatocytes. These results demonstrate that the unique NF?B site in the mouse CPB2 promoter is functional and mediates the upregulation of mouse CPB2 expression by TNF? via increase in NF?B translocation to the nucleus. PMID:22217421

Garand, Mathieu; Lin, Joellen H H; Hill, Ceredwyn E; Zagorac, Branislava; Koschinsky, Marlys L; Boffa, Michael B

2012-01-02

280

The murine gap junction gene connexin36 is highly expressed in mouse retina and regulated during brain development  

Microsoft Academic Search

A new gap junction gene isolated from rat brain cDNA, mouse retina cDNA and mouse genomic DNA is called connexin36, since it codes for a connexin protein of 321 amino acids corresponding to the theoretical molecular mass of 36?045 kDa (rat) and 36?084 kDa (mouse). Only one amino acid residue differs between rat and mouse connexin36. In the single murine

Goran Söhl; Joachim Degen; Barbara Teubner; Klaus Willecke

1998-01-01

281

A family of three mouse potassium channel genes with intronless coding regions.  

PubMed

To understand the molecular mechanisms responsible for generating physiologically diverse potassium channels in mammalian cells, mouse genomic clones have been isolated with a potassium channel complementary DNA, MBK1, that is homologous to the Drosophila potassium channel gene, Shaker. A family of three closely related potassium channel genes (MK1, MK2, and MK3) that are encoded at distinct genomic loci has been isolated. Sequence analysis reveals that the coding region of each of these three genes exists as a single uninterrupted exon in the mouse genome. This organization precludes the generation of multiple forms of the protein by alternative RNA splicing, a mechanism known to characterize the Drosophila potassium channel genes Shaker and Shab. Thus, mammals may use a different strategy for generating diverse K+ channels by encoding related genes at multiple distinct genomic loci, each of which produces only a single protein. PMID:2305265

Chandy, K G; Williams, C B; Spencer, R H; Aguilar, B A; Ghanshani, S; Tempel, B L; Gutman, G A

1990-02-23

282

Regional Expression of MTG Genes in the Developing Mouse Central Nervous System  

PubMed Central

Myeloid translocation gene (MTG) proteins are transcriptional repressors that are highly conserved across species. We studied the expression of three members of this gene family, MTGR1, MTG8, and MTG16 in developing mouse central nervous system by in situ hybridization. All of these genes are detected as early as embryonic day 11.5. Because these genes are known to be induced by proneural genes during neurogenesis, we analyzed the expression of MTG genes in relation to two proneural genes, Neurog2 (also known as Ngn2 or Neurogenin 2) and Ascl1 (also known as Mash1). While MTGR1 are generally expressed in regions that also express Neurog2, MTG8 and MTG16 expression is associated more tightly with that of Ascl1-expressing neural progenitor cells. These results suggest the possibility that expression of MTG genes is differentially controlled by specific proneural genes during neurogenesis.

Alishahi, Amin; Koyano-Nakagawa, Naoko; Nakagawa, Yasushi

2009-01-01

283

Regional expression of MTG genes in the developing mouse central nervous system.  

PubMed

Myeloid translocation gene (MTG) proteins are transcriptional repressors that are highly conserved across species. We studied the expression of three members of this gene family, MTGR1, MTG8, and MTG16 in developing mouse central nervous system by in situ hybridization. All of these genes are detected as early as embryonic day 11.5. Because these genes are known to be induced by proneural genes during neurogenesis, we analyzed the expression of MTG genes in relation to two proneural genes, Neurog2 (also known as Ngn2 or Neurogenin 2) and Ascl1 (also known as Mash1). While MTGR1 are generally expressed in regions that also express Neurog2, MTG8 and MTG16 expression is associated more tightly with that of Ascl1-expressing neural progenitor cells. These results suggest the possibility that expression of MTG genes is differentially controlled by specific proneural genes during neurogenesis. PMID:19618476

Alishahi, Amin; Koyano-Nakagawa, Naoko; Nakagawa, Yasushi

2009-08-01

284

Isolation and characterization of two replication-dependent mouse H1 histone genes.  

PubMed

Mice contain at least seven nonallelic forms of the H1 histones, including the somatic variants H1a-e and less closely related variants H1 degrees and H1t. The mouse H1 degrees and H1c (H1var.1) genes were isolated and characterized previously. We have now isolated, sequenced and studied the expression properties of two additional mouse H1 genes, termed H1var.2 and H1var.3. Extensive amino acid and nucleotide sequence comparisons were made between the two genes and other mammalian H1 histone genes. A high degree of nucleotide sequence identity was seen between the H1var.2, rat H1d and human H1b genes, even well beyond the coding region, indicating that these genes are likely homologues. Unlike the previously characterized mouse H1var.1 gene which produces both nonpolyadenylated and polyadenylated mRNAs, the H1var.2 and H1var.3 genes produce only typical, replication dependent, nonpolyadenylated mRNAs. PMID:8190634

Dong, Y; Sirotkin, A M; Yang, Y S; Brown, D T; Sittman, D B; Skoultchi, A I

1994-04-25

285

In vivo high-efficiency transcoronary gene delivery and Cre–LoxP gene switching in the adult mouse heart  

Microsoft Academic Search

High-efficiency somatic gene transfer in adult mouse heart has not yet been achieved in vivo. Here, we demonstrate high-efficiency in vivo transcoronary gene delivery to the adult murine myocardium using a catheter-based technique with recombinant adenovirus (AdV) and adeno-associated virus (AAV) vectors in normal and genetically engineered mice. The method involves immersion hypothermia followed by transient aortic and pulmonary artery

M Iwatate; Y Gu; T Dieterle; Y Iwanaga; K L Peterson; M Hoshijima; K R Chien; J Ross

2003-01-01

286

Structure and chromosomal location of mouse and human CD52 genes.  

PubMed

Human CD52 (CAMPATH-1 antigen) is an abundant surface molecule on lymphocytes and a favoured target for lymphoma therapy and immunosuppression. It comprises a small glycosylphosphatidylinositol (GPI) anchored peptide to which a large carbohydrate moiety is attached. Structurally similar proteins include the proposed mouse homologue, B7 antigen (B7-Ag; not to be confused with the CD28 ligand), and human and mouse CD24. Sequence similarities between CD52 and B7-Ag precursors are concentrated over the signal peptides and the sequences cleaved during GPI attachment. While the short mature peptides are not apparently homologous, the N-linked glycosylation site is retained in both. We describe similarities in exon-intron organisation, syntenic chromosome positions (human CD52, 1p36; mouse B7-Ag, chromosome 4, between Dsil and D4Nds16) and sequence homology in the promoter regions which strongly suggests that B7-Ag is the mouse homologue of CD52. The structure of these genes is also similar to that of mouse CD24, suggesting a common ancestor. Promoter activities and transcription start sites were also analysed. These results suggest that human CD52 and mouse B7-Ag gene expressions are controlled by TATA-less promoters. PMID:10524207

Tone, M; Nolan, K F; Walsh, L A; Tone, Y; Thompson, S A; Waldmann, H

1999-09-01

287

Characterization and Comparison of the Human and Mouse GLC1A Glaucoma Genes  

PubMed Central

The GLC1A gene (which encodes the protein myocilin) has been associated with the development of primary open angle glaucoma. Bacterial artificial chromosomes containing the human GLC1A gene and its mouse ortholog were subcloned and sequenced to reveal the genomic structure of the genes. Comparison of the coding sequences of the human and mouse GLC1A genes revealed a high degree of amino acid homology (82%) and the presence of several conserved motifs in the predicted GLC1A proteins. The expression of GLC1A was examined by Northern blot analysis of RNA from adult human tissues. GLC1A expression was observed in 17 of 23 tissues tested, suggesting a wider range of expression than was recognized previously. The comparison of the human and mouse GLC1A genes suggests that the mouse may be a useful model organism in studying the molecular pathophysiology of glaucoma. [The sequence data described in this paper have been submitted to the GenBank data library under accession nos. AF049791–AF049796.

Fingert, John H.; Ying, Lihua; Swiderski, Ruth E.; Nystuen, Arne M.; Arbour, Nancy C.; Alward, Wallace L.M.; Sheffield, Val C.; Stone, Edwin M.

1998-01-01

288

Manual Gene Ontology annotation workflow at the Mouse Genome Informatics Database  

PubMed Central

The Mouse Genome Database, the Gene Expression Database and the Mouse Tumor Biology database are integrated components of the Mouse Genome Informatics (MGI) resource (http://www.informatics.jax.org). The MGI system presents both a consensus view and an experimental view of the knowledge concerning the genetics and genomics of the laboratory mouse. From genotype to phenotype, this information resource integrates information about genes, sequences, maps, expression analyses, alleles, strains and mutant phenotypes. Comparative mammalian data are also presented particularly in regards to the use of the mouse as a model for the investigation of molecular and genetic components of human diseases. These data are collected from literature curation as well as downloads of large datasets (SwissProt, LocusLink, etc.). MGI is one of the founding members of the Gene Ontology (GO) and uses the GO for functional annotation of genes. Here, we discuss the workflow associated with manual GO annotation at MGI, from literature collection to display of the annotations. Peer-reviewed literature is collected mostly from a set of journals available electronically. Selected articles are entered into a master bibliography and indexed to one of eight areas of interest such as ‘GO’ or ‘homology’ or ‘phenotype’. Each article is then either indexed to a gene already contained in the database or funneled through a separate nomenclature database to add genes. The master bibliography and associated indexing provide information for various curator-reports such as ‘papers selected for GO that refer to genes with NO GO annotation’. Once indexed, curators who have expertise in appropriate disciplines enter pertinent information. MGI makes use of several controlled vocabularies that ensure uniform data encoding, enable robust analysis and support the construction of complex queries. These vocabularies range from pick-lists to structured vocabularies such as the GO. All data associations are supported with statements of evidence as well as access to source publications.

Drabkin, Harold J.; Blake, Judith A.

2012-01-01

289

Analysis of CREM-dependent gene expression during mouse spermatogenesis  

Microsoft Academic Search

The transcription factors CREM, CREB, and ATF-1 constitute a subfamily of ?-Zip transcription factors. Several different kinase cascades regulate the activity of these proteins. The activator splice–isoform CREM? is specifically and highly expressed in post-meiotic germ cells during mouse spermatogenesis. Male mice lacking CREM? expression are sterile because of stage-specific arrest of sperm maturation as the spermatids undergo apoptosis.In order

Tim Beißbarth; Igor Borisevich; Andreas Hörlein; Marc Kenzelmann; Manfred Hergenhahn; Annette Klewe-Nebenius; Ralf Klären; Bernhard Korn; Wolfgang Schmid; Martin Vingron; Günther Schütz

2003-01-01

290

Apoptosis, proliferation and gene expression patterns in mouse developing tongue  

Microsoft Academic Search

The Fgf\\/Fgfr (Fgf receptor) and Bmp signal pathways are critical for embryonic development and postnatal growth. In order\\u000a to address their roles in tongue development, preliminary study of expression patterns of some important members in the two\\u000a families, as well as of apoptosis and proliferation, were carried out in mouse developing tongue. Apoptosis in tongue is a\\u000a very late event

Xuguang Nie

2005-01-01

291

Comparative analysis of the 5â² genomic and promoter regions between the mouse (Hdh) and human Huntington disease (HD) gene  

Microsoft Academic Search

The mouse homologue of the Huntington disease gene (Hdh) has recently been cloned and mapped to a region of synteny with the human, on mouse chromosome 5. The two genes share a high degree of both coding (90% amino acid) and nucleotide (86.2%) identity. We have subsequently performed a detailed comparison of the genomic organization of the 5â² region of

M. Kalchman; B. Lin; J. Nasir

1994-01-01

292

Mutation of the Sry-Related Sox10 Gene in Dominant megacolon, a Mouse Model for Human Hirschsprung Disease  

Microsoft Academic Search

The spontaneous mouse mutant Dominant megacolon (Dom) is a valuable model for the study of human congenital megacolon (Hirschsprung disease). Here we report that the defect in the Dom mouse is caused by mutation of the gene encoding the Sry-related transcription factor Sox10. This assignment is based on (i) colocalization of the Sox10 gene with the Dom mutation on chromosome

Beate Herbarth; Veronique Pingault; Nadege Bondurand; Kirsten Kuhlbrodt; Irm Hermans-Borgmeyer; Aldamaria Puliti; Nicole Lemort; Michel Goossens; Michael Wegner

1998-01-01

293

The Role of Pax2 Gene in Mouse Prostate Development  

PubMed Central

BACKGROUND Loss-of-function of Pax2 results in severe defects of the male reproductive system, and Pax2 expression is detected in mouse prostate lobes and human prostatic cancers. However, the role for Pax2 in prostate development remains poorly understood. METHODS The expression of Pax2 was examined by in situ hybridization at various developmental stages. Urogenital sinuses (UGS) were dissected out at E18.5 from mouse Pax2 mutants and controls, cultured in vitro or grafted under the renal capsule of CD1 nude mice. The expression of prostate developmental regulatory factors was analyzed by semi-quantitative real-time PCR or immuohistochemistry. RESULTS Pax2 is expressed in the epithelial cells of prostate buds. Loss-of-function of Pax2 does not affect the initiation of prostatic buds, but in vitro culture assays show that the prostates of Pax2 mutants are hypomorphic and branching is severely disrupted compared to controls. RT-PCR data from Pax2 mutant prostates demonstrate increased expression levels of dorsolateral prostate (DLP) marker MSMB and ventral prostate (VP) marker SBP and dramatically reduced expression levels of anterior prostate (AP) marker TGM4. CONCLUSIONS Pax2 is essential for mouse prostate development and regulates prostatic ductal growth, branching and lobe-specific identity. These findings are important for understanding the molecular regulatory mechanisms in prostate development.

Xu, Ben; Hariharan, Arun; Rakshit, Sabita; Dressler, Gregory R.; Wellik, Deneen M.

2011-01-01

294

Alcohol-Induced Myocardial Fibrosis in Metallothionein-Null Mice  

PubMed Central

Alcohol-induced cardiomyopathy including fibrosis has been recognized clinically for a long time, but its pathogenesis is incompletely understood. Studies using experimental animals have not fully duplicated the pathological changes in humans, and animal models of alcoholic cardiac fibrosis are not available. In the present study, we have developed a mouse model in which cardiac hypertrophy and fibrosis were produced in metallothionein-knockout (MT-KO) mice fed an alcohol-containing liquid diet for 2 months. The same alcohol feeding did not produce cardiac fibrosis in the wild-type (WT) control mice, although there was no difference in the alcohol-induced heart hypertrophy between the WT controls and the MT-KO mice. Zinc supplementation prevented cardiac fibrosis but did not affect heart hypertrophy in the alcohol-fed MT-KO mice, suggesting a specific link between zinc homeostasis and cardiac fibrosis. Serum creatine phosphokinase activity was significantly higher in the alcohol-administered MT-KO mice than in the WT mice, and zinc supplementation decreased serum creatine phosphokinase activities and eliminated the difference between the groups. Thus, disturbance in zinc homeostasis due to the lack of MT associates with alcohol-induced cardiac fibrosis and more severe cardiac injury, making the MT-KO mouse model of alcohol-induced cardiac fibrosis a useful tool to investigate specific factors involved in the alcoholic cardiomyopathy.

Wang, Lipeng; Zhou, Zhanxiang; Saari, Jack T.; Kang, Y. James

2005-01-01

295

Organization of human and mouse skeletal myosin heavy chain gene clusters is highly conserved  

PubMed Central

Myosin heavy chains (MyHCs) are highly conserved ubiquitous actin-based motor proteins that drive a wide range of motile processes in eukaryotic cells. MyHC isoforms expressed in skeletal muscles are encoded by a multigene family that is clustered on syntenic regions of human and mouse chromosomes 17 and 11, respectively. In an effort to gain a better understanding of the genomic organization of the skeletal MyHC genes and its effects on the regulation, function, and molecular genetics of this multigene family, we have constructed high-resolution physical maps of both human and mouse loci using PCR-based marker content mapping of P1-artificial chromosome clones. Genes encoding six MyHC isoforms have been mapped with respect to their linear order and transcriptional orientations within a 350-kb region in both human and mouse. These maps reveal that the order, transcriptional orientation, and relative intergenic distances of these genes are remarkably conserved between these species. Unlike many clustered gene families, this order does not reflect the known temporal expression patterns of these genes. However, the conservation of gene organization since the estimated divergence of these species (?75–110 million years ago) suggests that the physical organization of these genes may be significant for their regulation and function.

Weiss, Allison; McDonough, Debra; Wertman, Brett; Acakpo-Satchivi, Leslie; Montgomery, Kate; Kucherlapati, Raju; Leinwand, Leslie; Krauter, Kenneth

1999-01-01

296

A Mediator Role For Metallothionein in Tumor Necrosis Factor-induced Lethal Shock  

Microsoft Academic Search

Tumor necrosis factor (TNF) is a proinflammatory cytokine, which is centrally involved in several inflammatory disorders. Administration of TNF leads to a potentially lethal systemic in- flammatory response syndrome (SIRS). We observed that (a) mice lacking functional genes for metallothionein 1 and 2 (MT-null) were protected compared with wild-type controls ( P ? 0.0078), and (b) mice overexpressing MT-1 (MT-TG)

Wim Waelput; Daniël Broekaert; Joël Vandekerckhove; Peter Brouckaert; Jan Tavernier; Claude Libert

2001-01-01

297

Co-expression profiling of autism genes in the mouse brain.  

PubMed

Autism spectrum disorder (ASD) is one of the most prevalent and highly heritable neurodevelopmental disorders in humans. There is significant evidence that the onset and severity of ASD is governed in part by complex genetic mechanisms affecting the normal development of the brain. To date, a number of genes have been associated with ASD. However, the temporal and spatial co-expression of these genes in the brain remain unclear. To address this issue, we examined the co-expression network of 26 autism genes from AutDB (http://mindspec.org/autdb.html), in the framework of 3,041 genes whose expression energies have the highest correlation between the coronal and sagittal images from the Allen Mouse Brain Atlas database (http://mouse.brain-map.org). These data were derived from in situ hybridization experiments conducted on male, 56-day old C57BL/6J mice co-registered to the Allen Reference Atlas, and were used to generate a normalized co-expression matrix indicating the cosine similarity between expression vectors of genes in this database. The network formed by the autism-associated genes showed a higher degree of co-expression connectivity than seen for the other genes in this dataset (Kolmogorov-Smirnov P?=?5×10?²?). Using Monte Carlo simulations, we identified two cliques of co-expressed genes that were significantly enriched with autism genes (A Bonferroni corrected P<0.05). Genes in both these cliques were significantly over-expressed in the cerebellar cortex (P?=?1×10??) suggesting possible implication of this brain region in autism. In conclusion, our study provides a detailed profiling of co-expression patterns of autism genes in the mouse brain, and suggests specific brain regions and new candidate genes that could be involved in autism etiology. PMID:23935468

Menashe, Idan; Grange, Pascal; Larsen, Eric C; Banerjee-Basu, Sharmila; Mitra, Partha P

2013-07-25

298

Chromosomal mapping of the mouse A3 adenosine receptor gene, Adora3  

SciTech Connect

A3 adenosine receptor is a member of Gi protein-coupled receptors that mediate inhibition of adenylate cyclase activity upon binding to the ligand. We determined the chromosome localization of the mouse A3 gene for future genetic studies, utilizing an interspecific backcross panel formed from the cross (C57BL/6J x Mus spretus)F{sub 1} x M. spretus. Genomic DNAs from 94 individuals in the backcross were analyzed by Southern hybridization with murine A3 receptor cDNA probe. Unique map positions were determined by haplotype analysis with 1388 previously mapped loci in the mouse backcross. The mouse A3 receptor gene (Adora3) mapped to chromosome 3, in tight linkage with DNA marker D3Bir15. 12 refs., 1 fig.

Zhao, Z.; Ravid, K. [Boston Univ. School of Medicine, MA (United States); Ravid, S. [Harvard Medical School, Boston, MA (United States)

1995-11-01

299

Extensive compensatory cis-trans regulation in the evolution of mouse gene expression  

PubMed Central

Gene expression levels are thought to diverge primarily via regulatory mutations in trans within species, and in cis between species. To test this hypothesis in mammals we used RNA-sequencing to measure gene expression divergence between C57BL/6J and CAST/EiJ mouse strains and allele-specific expression in their F1 progeny. We identified 535 genes with parent-of-origin specific expression patterns, although few of these showed full allelic silencing. This suggests that the number of imprinted genes in a typical mouse somatic tissue is relatively small. In the set of nonimprinted genes, 32% showed evidence of divergent expression between the two strains. Of these, 2% could be attributed purely to variants acting in trans, while 43% were attributable only to variants acting in cis. The genes with expression divergence driven by changes in trans showed significantly higher sequence constraint than genes where the divergence was explained by variants acting in cis. The remaining genes with divergent patterns of expression (55%) were regulated by a combination of variants acting in cis and variants acting in trans. Intriguingly, the changes in expression induced by the cis and trans variants were in opposite directions more frequently than expected by chance, implying that compensatory regulation to stabilize gene expression levels is widespread. We propose that expression levels of genes regulated by this mechanism are fine-tuned by cis variants that arise following regulatory changes in trans, suggesting that many cis variants are not the primary targets of natural selection.

Goncalves, Angela; Leigh-Brown, Sarah; Thybert, David; Stefflova, Klara; Turro, Ernest; Flicek, Paul; Brazma, Alvis; Odom, Duncan T.; Marioni, John C.

2012-01-01

300

EMAGE: a spatial database of gene expression patterns during mouse embryo development  

PubMed Central

EMAGE () is a freely available, curated database of gene expression patterns generated by in situ techniques in the developing mouse embryo. It is unique in that it contains standardized spatial representations of the sites of gene expression for each gene, denoted against a set of virtual reference embryo models. As such, the data can be interrogated in a novel and abstract manner by using space to define a query. Accompanying the spatial representations of gene expression patterns are text descriptions of the sites of expression, which also allows searching of the data by more conventional text-based methods.

Christiansen, Jeffrey H.; Yang, Yiya; Venkataraman, Shanmugasundaram; Richardson, Lorna; Stevenson, Peter; Burton, Nicholas; Baldock, Richard A.; Davidson, Duncan R.

2006-01-01

301

EMAGE: a spatial database of gene expression patterns during mouse embryo development.  

PubMed

EMAGE (http://genex.hgu.mrc.ac.uk/Emage/database) is a freely available, curated database of gene expression patterns generated by in situ techniques in the developing mouse embryo. It is unique in that it contains standardized spatial representations of the sites of gene expression for each gene, denoted against a set of virtual reference embryo models. As such, the data can be interrogated in a novel and abstract manner by using space to define a query. Accompanying the spatial representations of gene expression patterns are text descriptions of the sites of expression, which also allows searching of the data by more conventional text-based methods. PMID:16381949

Christiansen, Jeffrey H; Yang, Yiya; Venkataraman, Shanmugasundaram; Richardson, Lorna; Stevenson, Peter; Burton, Nicholas; Baldock, Richard A; Davidson, Duncan R

2006-01-01

302

Gene expression profiles in normal and Otx2?/? early gastrulating mouse embryos  

PubMed Central

The mouse Otx2 gene is a homeobox transcription factor required as early as gastrulation for the proper development of the head. We compared gene expression profiles in wild-type and Otx2?/? 6.5 days postcoitum embryos by using a serial analysis of gene expression assay adapted to microdissected structures. Among a broader list, the study of six genes found to be differentially expressed allows defining a role for Otx2 in the orchestration of cell movements leading to the adequate organization of the embryo before gastrulation.

Zakin, Lise; Reversade, Bruno; Virlon, Berangere; Rusniok, Christophe; Glaser, Philippe; Elalouf, Jean-Marc; Brulet, Philippe

2000-01-01

303

Mapping of a liver phosphorylase kinase [alpha]-subunit gene on the mouse x chromosome  

SciTech Connect

Phosphorylase kinase (PHK) is a regulatory enzyme of the glycogenolytic pathway composed of a complex of four subunits. We recently mapped the muscle [alpha]-subunit gene (Phka) to the mouse X chromosome in a region syntenic with the proximal long arm of the human X chromosome and containing the human homologue of this gene, PHKA. We now report the mapping of the liver [alpha]-subunit gene to the telomeric end of the mouse X chromosome. This mapping position would suggest a location for the human liver [alpha]-subunit gene on the proximal short arm of the X chromosome, a region recently implicated in X-linked liver glycogenosis (XLG). 20 refs., 2 figs.

Geng, Yan; Derry, J.M.J.; Barnard, P.J. (MRC Molecular Neurobiology Unit, Cambridge (United Kingdom)); Hendrickx, J.; Coucke, P.; Willems, P.R. (Univ. of Antwerp (Belgium))

1993-01-01

304

Gene expression profiling of mouse p53-deficient epidermal carcinoma defines molecular determinants of human cancer malignancy  

PubMed Central

Background The epidermal specific ablation of Trp53 gene leads to the spontaneous development of aggressive tumors in mice through a process that is accelerated by the simultaneous ablation of Rb gene. Since alterations of p53-dependent pathway are common hallmarks of aggressive, poor prognostic human cancers, these mouse models can recapitulate the molecular features of some of these human malignancies. Results To evaluate this possibility, gene expression microarray analysis was performed in mouse samples. The mouse tumors display increased expression of cell cycle and chromosomal instability associated genes. Remarkably, they are also enriched in human embryonic stem cell gene signatures, a characteristic feature of human aggressive tumors. Using cross-species comparison and meta-analytical approaches, we also observed that spontaneous mouse tumors display robust similarities with gene expression profiles of human tumors bearing mutated TP53, or displaying poor prognostic outcome, from multiple body tissues. We have obtained a 20-gene signature whose genes are overexpressed in mouse tumors and can identify human tumors with poor outcome from breast cancer, astrocytoma and multiple myeloma. This signature was consistently overexpressed in additional mouse tumors using microarray analysis. Two of the genes of this signature, AURKA and UBE2C, were validated in human breast and cervical cancer as potential biomarkers of malignancy. Conclusions Our analyses demonstrate that these mouse models are promising preclinical tools aimed to search for malignancy biomarkers and to test targeted therapies of prospective use in human aggressive tumors and/or with p53 mutation or inactivation.

2010-01-01

305

The mouse polyubiquitin gene Ubb is essential for meiotic progression  

Microsoft Academic Search

Ubiquitin is encoded in mice by two polyubiquitin genes, Ubb and Ubc, that are considered to be stress inducible and two constitutively expressed monoubiquitin (Uba) genes. Here we report that targeted disruption of Ubb results in male and female infertility due to failure of germ cells to progress through meiosis I and hypogonadism. In the absence of Ubb, spermatocytes and

Kwon-Yul Ryu; Shamim A. Sinnar; Laura G. Reinholdt; Sergio Vaccari; S. Hall; M. A. Garcia; T. S. Zaitseva; D. M. Bouley; K. Boekelheide; M. A. Handel; M. Conti; R. R. Kopito

2008-01-01

306

Characterization of the genomic structure of the mouse APLP1 gene  

SciTech Connect

This article reports on the organization of the mouse APLP1 gene, an evolutionarily conserved amyloid precursor-like protein. The amyloid beta protein, important in Alzheimer diseases, is derived from these precursor proteins. By investigating the expression and structure of this murine gene, it is hoped that more will be learned about the function and regulation of the human homologue. 27 refs., 2 figs.

Zhong, Sue; Wu, Kuo; Black, I.B.; Schaar, D.G. [State Univ. of New Jersey, Piscataway, NJ (United States)

1996-02-15

307

Mapping of 195 genes in cattle and updated comparative map with man, mouse, rat and pig  

Microsoft Academic Search

Our on-going goal is to improve and update the comparative genome organization between cattle and man but also among the most detailed mammalian species genomes i.e. cattle, mouse, rat and pig. In this work, we localized 195 genes in cattle and checked all human\\/bovine non-concordant localizations found in the literature. Next, we compiled all the genes mapped in cattle, goat,

H. Hayes; C. Elduque; M. Gautier; L. Schibler; E. Cribiu; A. Eggen

2003-01-01

308

Correction of a mouse model of Menkes disease by the human Menkes gene  

Microsoft Academic Search

The brindled mouse is an accurate model of the fatal human X-linked copper deficiency disorder, Menkes disease. Males carrying the mutant allele of the Menkes gene orthologue Atp7a die in the second week of life. To determine whether the genetic defect in the brindled mice could be corrected by expression of the human Menkes gene, male transgenic mice expressing ATP7A

Roxana M. Llanos; Bi-Xia Ke; Magali Wright; Yolanda Deal; Francois Monty; David R. Kramer; Julian F. B. Mercer

2006-01-01

309

A Novel ATPase on Mouse Chromosome 7 is a Candidate Gene for Increased Body Fat  

Microsoft Academic Search

A region of mouse chromosome 7, just distal to the pink-eyed (p) dilution locus, contains a gene or genes, which we have named p-locus-associated obesity (plo1), affecting body fat. Mice heterozygous for the most distally extending chromosomal deletions of this region have nearly double the body fat of mice when the deletion is inherited maternally as when it is inherited

Madhu S Dhar; Lisa S. Webb; Laurel Smith; Loren Hauser; Dabney Johnson; David B. West

2000-01-01

310

A major testicular cell protein specified by a mouse t\\/t complex gene  

Microsoft Academic Search

Summary The technique of twtiimensional gel electroph+ resis was used to identify a major testicular cell protein, p63\\/6.Q, which is specified by a gene (~63) within the mouse T\\/t complex on chromosome 17. A wild-type gene causes the expression of one form of this protein, p63\\/6.Qb. All lethal and semilethal t haplotypes derived from wild mice cause the expression of

Lee M. Silver; Karen Artzt; Dorothea Bennett

1979-01-01

311

Vanadate-induced gene expression in mouse C127 cells: roles of oxygen derived active species  

Microsoft Academic Search

An underinvestigated aspect of the mitogenic and cell regulatory actions of vanadium is the regulation of gene expression. Among the fifteen cellular genes studied in cultured mouse C127 cells, vanadium (as 10 µM sodium vanadate) increased levels of mRNA of the actin and c-Ha-ras to four times control values. These increases represented de novo synthesis of mRNA, since they were

Xuefeng Yin; Allan J. Davison; Siu Sing Tsang

1992-01-01

312

Identification of Genes and Networks Driving Cardiovascular and Metabolic Phenotypes in a Mouse F2 Intercross  

Microsoft Academic Search

To identify the genes and pathways that underlie cardiovascular and metabolic phenotypes we performed an integrated analysis of a mouse C57BL\\/6J x A\\/J F2 (B6AF2) cross by relating genome-wide gene expression data from adipose, kidney, and liver tissues to physiological endpoints measured in the population. We have identified a large number of trait QTLs including loci driving variation in cardiac

Jonathan M. J. Derry; Hua Zhong; Cliona Molony; Doug MacNeil; Debraj Guhathakurta; Bin Zhang; John Mudgett; Kersten Small; Lahcen El Fertak; Alain Guimond; Mohammed Selloum; Wenqing Zhao; Marie France Champy; Laurent Monassier; Tom Vogt; Doris Cully; Andrew Kasarskis; Eric E. Schadt; Gregory S. Barsh

2010-01-01

313

Homozygous deletions and point mutations of the Ikaros gene in ?-ray-induced mouse thymic lymphomas  

Microsoft Academic Search

Our previous genome-wide analysis of allelic loss for thymic lymphomas that were induced by ?-irradiation in F1 hybrid mice between BALB\\/c and MSM strains suggested the centromeric region on chromosome 11 as a site harboring a tumor suppressor gene. Interestingly, to this region the mouse Ikaros gene was mapped which was postulated to participate in oncogenic process from the study

Hitomi Okano; Yuko Saito; Tomonori Miyazawa; Toshimitsu Shinbo; Daizen Chou; Shin-ichi Kosugi; Yoshiaki Takahashi; Shoji Odani; Ohtsura Niwa; Ryo Kominami

1999-01-01

314

Specific interference with gene function by double-stranded RNA in early mouse development  

Microsoft Academic Search

The use of double-stranded (ds) RNA is a powerful way of interfering with gene expression in a range of organisms, but doubts have been raised about whether it could be successful in mammals. Here, we show that dsRNA is effective as a specific inhibitor of the function of three genes in the mouse, namely maternally expressed c-mos in the oocyte

Florence Wianny; Magdalena Zernicka-Goetz

1999-01-01

315

Effects of the steel gene product on mouse primordial germ cells in culture  

Microsoft Academic Search

MUTATIONS at the steel (si) and dominant white spotting (W) loci in the mouse affect primordial germ cells (PGC), melanoblasts and haemopoietic stem cells1. The W gene encodes a cell-surface receptor of the tyrosine kinase family2,3, the proto-oncogene c-kit. In situ analysis has shown c-kitmessenger RNA expression in PGC in the early genital ridges4. The SI gene encodes the ligand

I. Godin; R. Deed; J. Cooke; K. Zsebo; M. Dexter; C. C. Wylie

1991-01-01

316

Regulation of human protein C gene expression by the mouse WAP promoter  

Microsoft Academic Search

A 4.1 kb mouse whey acidic protein (mWAP) promoter was cloned from a C57BL\\/6 cosmid library. The tissue-specific and developmental pattern of expression of a hybrid gene comprised of the mWAP promoter fragment and the human protein C (HPC) gene was analysed in transgenic mice. The corresponding RNA was detected mainly in the mammary gland, with ‘leakage’ of expression in

Rekha K. Paleyanda; Da-Wei Zhang; Lothar Hennighausen; Robert A. McKnight; Henryk Lubon

1994-01-01

317

Bacterial ?-galactosidase and human dystrophin genes are expressed in mouse skeletal muscle fibers after ballistic transfection  

Microsoft Academic Search

Ballistic transfection, based on cell and tissue bombardment by the tungsten and gold microparticles covered with the gene DNA, was used for the delivery of a bacterial ?-galactosidase and a full-length cDNA copy of the human dystrophin genes into mouse skeletal muscles. CMV-lacZ, SV40-lacZ, LTR-lacZneo and full-length cDNA dystrophin (pDMD-1, approximately 16 kb) in eukaryotic expression vector pJ OMEGA driven

Alexander V. Zelenin; Victor A. Kolesnikov; Olga A. Tarasenko; Ramin A. Shafei; Inessa A. Zelenina; Vyacheslav V. Mikhailov; Maria L. Semenova; Dmitry V. Kovalenko; Olga V. Artemyeva; Tatyana E. Ivaschenko; Oleg V. Evgrafov; George Dickson; Vladislav S. Baranovand

1997-01-01

318

Screening for genes up-regulated in 5\\/6 nephrectomized mouse kidney  

Microsoft Academic Search

Screening for genes up-regulated in 5\\/6 nephrectomized mouse kidney.BackgroundIn diabetic and nondiabetic renal diseases, glomerular hyperfiltration is believed to play a central role in the subsequent progression of glomerulosclerosis and interstitial renal scarring. To identify genes involved in the process of hyperfiltration and hypertrophy, a polymerase chain reaction (PCR)-based subtraction method, that is, representational difference analysis of cDNA (cDNA-RDA), was

Hong Zhang; Jun Wada; Yashpal S. Kanwar; Yoshinori Tsuchiyama; Keita Hiragushi; Kazuyuki Hida; Kenichi Shikata; Hirofumi Makino

1999-01-01

319

The Major Immediate-Early Gene ie3 of Mouse Cytomegalovirus Is Essential for Viral Growth  

Microsoft Academic Search

The significance of the major immediate-early gene ie3 of mouse cytomegalovirus (MCMV) and that of the corresponding ie2 gene of human cytomegalovirus to viral replication are not known. To investigate the function of the MCMV IE3 regulatory protein, we generated two different MCMV recombinants that contained a large deletion in the IE3 open reading frame (ORF). The mutant genomes were

ANA ANGULO; PETER GHAZAL; MARTIN MESSERLE

2000-01-01

320

Short sequence-paper Characterisation, chromosomal localisation and expression of the mouse Kid3 gene1  

Microsoft Academic Search

Kid1 encodes a transcriptional repressor implicated in the differentiation of renal epithelial cells. Here we report the characterisation of Kid3, a novel mouse gene related to Kid1. Kid3 encodes a C2H2 zinc finger protein with an N-terminal KRAB transcriptional repression domain. It maps to chromosome 11, adjacent to Kid1 and another related gene Kid2. Northern analysis shows that Kid3 is

Robert P. Watson; Nicoletta Tekki-Kessaris; Catherine A. Boulter

321

BioGPS and GXD: mouse gene expression data - the benefits and challenges of data integration  

PubMed Central

Mouse gene expression data are complex and voluminous. To maximize the utility of these data, they must be made readily accessible through databases, and those resources need to place the expression data in the larger biological context. Here we describe two community resources that approach these problems in different but complementary ways: BioGPS and the Mouse Gene Expression Database (GXD). BioGPS connects its large and homogenous microarray gene expression reference data sets via plugins with a heterogeneous collection of external gene centric resources, thus casting a wide but loose net. GXD acquires different types of expression data from many sources and integrates these data tightly with other types of data in the Mouse Genome Informatics (MGI) resource, with a strong emphasis on consistency checks and manual curation. We describe and contrast the “loose” and “tight” data integration strategies employed by BioGPS and GXD, respectively, and discuss the challenges and benefits of data integration. BioGPS is freely available at http://biogps.org. GXD is freely available through the Mouse Genome Informatics (MGI) web site (www.informatics.jax.org), or directly at www.informatics.jax.org/expression.shtml.

Wu, Chunlei

2012-01-01

322

Postnatal ontogenesis of clock genes in mouse suprachiasmatic nucleus and heart  

Microsoft Academic Search

BACKGROUND: The master clock within the hypothalamic suprachiasmatic nucleus (SCN) synchronizing clocks in peripheral tissues is entrained by the environmental condition, such as the light-dark (LD) cycle. The mechanisms of circadian clockwork are similar in both SCN and peripheral tissues. The aim of the present work was to observe the profiles of clock genes expression in mouse central and peripheral

Jie Huang; Chao Lu; Sifen chen; Luchun Hua; Ruizhe Qian

2010-01-01

323

Forging Links between Human Mental Retardation-Associated CNVs and Mouse Gene Knockout Models  

PubMed Central

Rare copy number variants (CNVs) are frequently associated with common neurological disorders such as mental retardation (MR; learning disability), autism, and schizophrenia. CNV screening in clinical practice is limited because pathological CNVs cannot be distinguished routinely from benign CNVs, and because genes underlying patients' phenotypes remain largely unknown. Here, we present a novel, statistically robust approach that forges links between 148 MR–associated CNVs and phenotypes from ?5,000 mouse gene knockout experiments. These CNVs were found to be significantly enriched in two classes of genes, those whose mouse orthologues, when disrupted, result in either abnormal axon or dopaminergic neuron morphologies. Additional enrichments highlighted correspondences between relevant mouse phenotypes and secondary presentations such as brain abnormality, cleft palate, and seizures. The strength of these phenotype enrichments (>100% increases) greatly exceeded molecular annotations (<30% increases) and allowed the identification of 78 genes that may contribute to MR and associated phenotypes. This study is the first to demonstrate how the power of mouse knockout data can be systematically exploited to better understand genetically heterogeneous neurological disorders.

Webber, Caleb; Hehir-Kwa, Jayne Y.; Nguyen, Duc-Quang; de Vries, Bert B. A.; Veltman, Joris A.; Ponting, Chris P.

2009-01-01

324

Enhanced gene expression in mouse lung by prolonging the retention time of intravenously injected plasmid DNA  

Microsoft Academic Search

The effect of retention time of plasmid DNA in mouse lung on the level of transgene expression after intravenous administration was examined. Using CMV driven expression system with luciferase gene as a reporter and preinjection of free cationic liposomes into the animal as means of manipulating the retention time of plasmid DNA, we demonstrated that naked plasmid DNA is effective

YK Song; F Liu; D Liu

1998-01-01

325

Global gene expression analysis of the mouse colonic mucosa treated with azoxymethane and dextran sodium sulfate  

Microsoft Academic Search

BACKGROUND: Chronic inflammation is well known to be a risk factor for colon cancer. Previously we established a novel mouse model of inflammation-related colon carcinogenesis, which is useful to examine the involvement of inflammation in colon carcinogenesis. To shed light on the alterations in global gene expression in the background of inflammation-related colon cancer and gain further insights into the

Rikako Suzuki; Shingo Miyamoto; Yumiko Yasui; Shigeyuki Sugie; Takuji Tanaka

2007-01-01

326

The localization of mouse globin genes: a test of the effectiveness of hybridization in situ  

Microsoft Academic Search

Hybridization of rabbit reticulocyte mRNA to banded mouse chromosomes in situ labeled several regions, including the globin loci. Whereas the labeling was sufficient to detect unknowns in the globin size class, the chromosome assignments would be doubtful without some means of removing trace contaminants from the probe or of recognizing chromosomal regions to which they hybridize. Mammalian gene mapping by

A. S. Henderson; M. T. Yu; K. C. Atwood

1978-01-01

327

Restricted expression of recombination activating gene (RAG-1) in mouse lymphoid tissues.  

National Technical Information Service (NTIS)

In an attempt to determine the distribution of recombinase activity in the mouse thymus, spleen, and lymph nodes, we used the in situ hybridization method to examine the expression of the recombination activating genes RAG-1 and RAG-2. Expression of RAG-1...

A. Yamamoto H. Fujinaga K. Hamatani M. Atsuta

1993-01-01

328

Tight Control of Respiration by NADH Dehydrogenase ND5 Subunit Gene Expression in Mouse Mitochondria  

Microsoft Academic Search

A mouse cell variant carrying in heteroplasmic form a nonsense mutation in the mitochondrial DNA- encoded ND5 subunit of the respiratory NADH dehydrogenase has been isolated and characterized. The derivation from this mutant of a large number of cell lines containing between 4 and 100% of the normal number of wild-type ND5 genes has allowed an analysis of the genetic

YIDONG BAI; REBECCA M. SHAKELEY; GIUSEPPE ATTARDI

2000-01-01

329

Chromosomal mapping and expression levels of a mouse soluble epoxide hydrolase gene  

Microsoft Academic Search

The chromosomal location of a murine soluble epoxide hydrolase gene was determined using in situ mapping, restriction fragment length polymorphism (RFLP) and simple sequence length polymorphism (SSLP) analysis. In situ hybridization to mouse metaphase chromosomes using a soluble epoxide hydrolase cDNA probe showed that soluble epoxide hydrolase maps at band D of chromosome 14. An RFLP found between Mus castaneus

David F. Grant; Jimmy L. Spearow; David H. Storms; Susanne Edelhoff; David A. Adler; Christine M. Disteche; Benjamin A. Taylor; Bruce D. Hammock

1994-01-01

330

In vivo high-efficiency transcoronary gene delivery and Cre-LoxP gene switching in the adult mouse heart.  

PubMed

High-efficiency somatic gene transfer in adult mouse heart has not yet been achieved in vivo. Here, we demonstrate high-efficiency in vivo transcoronary gene delivery to the adult murine myocardium using a catheter-based technique with recombinant adenovirus (AdV) and adeno-associated virus (AAV) vectors in normal and genetically engineered mice. The method involves immersion hypothermia followed by transient aortic and pulmonary artery occlusion with proximal intra-aortic segmental injection of cardioplegic solution containing substance P and viral vectors. Gene expression measured using a LacZ marker gene was observed throughout both ventricles. The expression efficiency of a cytoplasmic LacZ marker gene in the left ventricular myocardium was 56.4+/-14.5% (mean+/-s.d.) at 4 days with an AdV vector, and with an AAV vector it was 81.0+/-5.9% at 4 weeks. Following AAV gene transfer, no gene expression was found in kidney, brain, lung, and spleen, but there was slight expression in liver. In addition, we demonstrate temporally controlled genetic manipulation in the heart with an efficiency of 54.6+/-5.2%, by transferring an AdV vector carrying Cre recombinase in ROSA26 flox-LacZ reporter mice. Procedure-related mortality was 16% for AdV and zero for AAV transfer. Thus, this method provides efficient, relatively homogeneous gene expression in both ventricles of the adult mouse heart, and offers a novel approach for conditional gene rescue or ablation in genetically engineered mouse models. PMID:12960971

Iwatate, M; Gu, Y; Dieterle, T; Iwanaga, Y; Peterson, K L; Hoshijima, M; Chien, K R; Ross, J

2003-10-01

331

Locations of human and mouse genes encoding the RFX1 and RFX2 transcription factor proteins  

SciTech Connect

RFX transcription factors constitute a highly conserved family of site-specific DNA binding proteins involved in the expression of a variety of cellular and viral genes, including major histocompatibility complex class II genes and genes in human hepatitis B virus. Five members of the RFX gene family have been isolated from human and mouse, and all share a highly characteristic DNA binding domain that is distinct from other known DNA binding motifs. The human RFX1 and RFX2 genes have been assigned by in situ hybridization to chromosome 19p13.1 and 19p13.3, respectively. In this paper, we present data that localize RFX1 and RFX2 precisely within the detailed physical map of human chromosome 19 and genetic data that assign Rfx1 and Rfx2 to homologous regions of mouse chromosomes 8 and 17, respectively. These data define the established relationships between these homologous mouse and human regions in further detail and provide new tools for linking cloned genes to phenotypes in both species. 26 ref., 2 figs.

Doyle, J.; Stubbs, L. [Oak Ridge National Lab., TN (United States); Hoffman, S. [Lawrence Livermore National Lab., CA (United States)] [and others

1996-07-01

332

Gene expression profiling in a mouse model for African trypanosomiasis  

PubMed Central

This study aimed to provide the foundation for an integrative approach to the identification of the mechanisms underlying the response to infection with Trypanosoma congolense, and to identify pathways that have previously been overlooked. We undertook a large-scale gene expression analysis study comparing susceptible A/J and more tolerant C57BL/6 mice. In an initial time course experiment, we monitored the development of parasitaemia and anaemia in every individual. Based on the kinetics of disease progression, we extracted total RNA from liver at days 0, 4, 7, 10 and 17 post infection and performed a microarray analysis. We identified 64 genes that were differentially expressed in the two strains in non-infected animals, of which nine genes remained largely unaffected by the disease. Gene expression profiling at stages of low, peak, clearance and recurrence of parasitaemia suggest that susceptibility is associated with high expression of genes coding for chemokines (e.g. Ccl24, Ccl27 and Cxcl13), complement components (C1q and C3) and interferon receptor alpha (Ifnar1). Additionally, susceptible A/J mice expressed higher levels of some potassium channel genes. In contrast, messenger RNA levels of a few immune response, metabolism and protease genes (e.g. Prss7 and Mmp13) were higher in the tolerant C57BL/6 strain as compared to A/J.

Kierstein, S; Noyes, H; Naessens, J; Nakamura, Y; Pritchard, C; Gibson, J; Kemp, S; Brass, A

2007-01-01

333

Efficient gene modulation in mouse epiblast using a Sox2Cre transgenic mouse strain  

Microsoft Academic Search

We have generated a transgenic line that expresses the Cre gene product under the regulation of a 12.5 kb upstream regulatory sequence from the Sox2 gene. Using a R26R reporter line, we show that this transgenic line induces recombination in all epiblast cells by embryonic day (E) 6.5 but little or no activity in other extraembryonic cell types at this

Shigemi Hayashi; Paula Lewis; Larysa Pevny; Andrew P. McMahon

2002-01-01

334

Reference gene selection for real-time RT-PCR in regenerating mouse livers  

SciTech Connect

The liver has an intrinsic ability to undergo active proliferation and recover functional liver mass in response to an injury response. This regenerative process involves a complex yet well orchestrated change in the gene expression profile. To produce accurate and reliable gene expression of target genes during various stages of liver regeneration, the determination of internal control housekeeping genes (HKGs) those are uniformly expressed is required. In the present study, the gene expression of 8 commonly used HKGs, including GAPDH, ACTB, HPRT1, GUSB, PPIA, TBP, TFRC, and RPL4, were studied using mouse livers that were quiescent and actively regenerating induced by partial hepatectomy. The amplification of the HKGs was statistically analyzed by two different mathematical algorithms, geNorm and NormFinder. Using this method, PPIA and TBP gene expression found to be relatively stable regardless of the stages of liver regeneration and would be ideal for normalization to target gene expression.

Tatsumi, Kohei [Department of Pediatrics, Nara Medical University, 840 Shijo-cho, Kashihara, Nara 634-8522 (Japan); Ohashi, Kazuo [Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666 (Japan)], E-mail: ohashi@abmes.twmu.ac.jp; Taminishi, Sanae [Department of Pediatrics, Nara Medical University, 840 Shijo-cho, Kashihara, Nara 634-8522 (Japan); Okano, Teruo [Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666 (Japan); Yoshioka, Akira; Shima, Midori [Department of Pediatrics, Nara Medical University, 840 Shijo-cho, Kashihara, Nara 634-8522 (Japan)

2008-09-12

335

Voltage-gated potassium channel genes are clustered in paralogous regions of the mouse genome  

SciTech Connect

Cloning of the Drosophila Shaker gene established that a neurological phenotype including locomotor dysfunction can be caused by a mutation in a voltage-gated potassium (K) channel gene. Shaker sequences have been used to isolate a large family of related K channel genes from both flies and mammals. Toward elucidating the evolutionary relationship between loci and the potential causal connection that K channels may have to mammalian genetic disorders, the authors report here the genetic mapping of 12-16 different murine, voltage-gated K channel genes. They find that multiple genes, in some cases from distantly related K channel subfamilies, occur in clusters in the mouse genome. These mapping results suggest that the K channel gene subfamilies arose through ancient localized gene duplication events, followed by chromosomal duplications and rearrangements as well as further gene duplication. They also note that several neurologic disorders of both mouse and human are associated with the chromosomal regions containing K channel genes. 78 refs., 5 figs., 1 tab.

Lock, L.F.; Gilbert, D.J.; Jenkins, N.A.; Copeland, N.G. (ABL-Basic Research Program, Frederick, MD (United States)); Street, V.A.; Migeon, M.B.; Tempel, B.L. (VA Medical Center, Seattle, WA (United States) Univ. of Washington School of Medicine, Seattle, WA (United States))

1994-04-01

336

From Mouse to Human: Evolutionary Genomics Analysis of Human Orthologs of Essential Genes  

PubMed Central

Understanding the core set of genes that are necessary for basic developmental functions is one of the central goals in biology. Studies in model organisms identified a significant fraction of essential genes through the analysis of null-mutations that lead to lethality. Recent large-scale next-generation sequencing efforts have provided unprecedented data on genetic variation in human. However, evolutionary and genomic characteristics of human essential genes have never been directly studied on a genome-wide scale. Here we use detailed phenotypic resources available for the mouse and deep genomics sequencing data from human populations to characterize patterns of genetic variation and mutational burden in a set of 2,472 human orthologs of known essential genes in the mouse. Consistent with the action of strong, purifying selection, these genes exhibit comparatively reduced levels of sequence variation, skew in allele frequency towards more rare, and exhibit increased conservation across the primate and rodent lineages relative to the remainder of genes in the genome. In individual genomes we observed ?12 rare mutations within essential genes predicted to be damaging. Consistent with the hypothesis that mutations in essential genes are risk factors for neurodevelopmental disease, we show that de novo variants in patients with Autism Spectrum Disorder are more likely to occur in this collection of genes. While incomplete, our set of human orthologs shows characteristics fully consistent with essential function in human and thus provides a resource to inform and facilitate interpretation of sequence data in studies of human disease.

Georgi, Benjamin; Voight, Benjamin F.; Bucan, Maja

2013-01-01

337

From mouse to human: evolutionary genomics analysis of human orthologs of essential genes.  

PubMed

Understanding the core set of genes that are necessary for basic developmental functions is one of the central goals in biology. Studies in model organisms identified a significant fraction of essential genes through the analysis of null-mutations that lead to lethality. Recent large-scale next-generation sequencing efforts have provided unprecedented data on genetic variation in human. However, evolutionary and genomic characteristics of human essential genes have never been directly studied on a genome-wide scale. Here we use detailed phenotypic resources available for the mouse and deep genomics sequencing data from human populations to characterize patterns of genetic variation and mutational burden in a set of 2,472 human orthologs of known essential genes in the mouse. Consistent with the action of strong, purifying selection, these genes exhibit comparatively reduced levels of sequence variation, skew in allele frequency towards more rare, and exhibit increased conservation across the primate and rodent lineages relative to the remainder of genes in the genome. In individual genomes we observed ~12 rare mutations within essential genes predicted to be damaging. Consistent with the hypothesis that mutations in essential genes are risk factors for neurodevelopmental disease, we show that de novo variants in patients with Autism Spectrum Disorder are more likely to occur in this collection of genes. While incomplete, our set of human orthologs shows characteristics fully consistent with essential function in human and thus provides a resource to inform and facilitate interpretation of sequence data in studies of human disease. PMID:23675308

Georgi, Benjamin; Voight, Benjamin F; Bu?an, Maja

2013-05-09

338

Roles of copper chaperone for superoxide dismutase 1 and metallothionein in copper homeostasis.  

PubMed

Copper chaperone for SOD1 (CCS) specifically delivers copper (Cu) to copper, zinc superoxide dismutase (SOD1) in cytoplasm of mammalian cells. In the present study, small interfering RNA (siRNA) targeting CCS was introduced into metallothionein-knockout mouse fibroblasts (MT-KO cells) and their wild type cells (MT-WT cells) to reveal the interactive role of CCS with other Cu-regulating proteins, in particular, MT. CCS knockdown significantly decreased Ctr1, a Cu influx transporter, mRNA expression. On the other hand, Atp7a, a Cu efflux transporter, mRNA expression was increased 3.0 and 2.5 times higher than those of the control in MT-WT and MT-KO cells. These responses of Cu-regulating genes to the CCS knockdown reflected the presence of excess Cu in the cells. To evaluate the Atp7a function in the Cu-replete cells, siRNA of Atp7a and the other Cu transporter, Atp7b were introduced into MT-WT and MT-KO cells. The Atp7a knockdown significantly increased the intracellular Cu concentration, whereas the Atp7b knockdown had no affect. Although two MT isoforms were induced by the CCS knockdown in MT-WT cells, the expression and activity of SOD1 were maintained in both MT-WT and MT-KO cells even when CCS protein expression was reduced to 0.30-0.35 of control. This suggests that the amount of CCS protein exceeds that required to supply Cu to SOD1 in the cells. Further, the CCS knockdown induces Cu accumulation in cells, however, the Cu accumulation is ameliorated by the MT induction, the decrease of Ctr1 expression and the increase of Atp7a expression to maintain Cu homeostasis. PMID:21409224

Miyayama, Takamitsu; Ishizuka, Yudai; Iijima, Tomomi; Hiraoka, Daisuke; Ogra, Yasumitsu

2011-03-15

339

Structural characterization and chromosomal location of the mouse macrophage migration inhibitory factor gene and pseudogenes  

SciTech Connect

Macrophage migration inhibitory factor, MIF, is a cytokine released by T-lymphocytes, macrophages, and the pituitary gland that serves to integrate peripheral and central inflammatory responses. Ubiquitous expression and developmental regulation suggest that MIF may have additional roles outside of the immune system. Here we report the structure and chromosomal location of the mouse Mif gene and the partial characterization of five Mif pseudogenes. The mouse Mif gene spans less than 0.7 kb of chromosomal DNA and is composed of three exons. A comparison between the mouse and the human genes shows a similar gene structure and common regulatory elements in both promoter regions. The mouse Mif gene maps to the middle region of chromosome 10, between Bcr and S100b, which have been mapped to human chromosomes 22q11 and 21q22.3, respectively. The entire sequence of two pseudogenes demonstrates the absence of introns, the presence of the 5{prime} untranslated region of the cDNA, a 3{prime} poly(A) tail, and the lack of sequence similarity with untranscribed regions of the gene. The five pseudogenes are highly homologous to the cDNA, but contain a variable number of mutations that would produce mutated or truncated MIF-like proteins. Phylogenetic analyses of MIF genes and pseudogenes indicate several independent genetic events that can account for multiple genomic integrations. Three of the Mif pseudogenes were also mapped by interspecific backcross to chromosomes 1, 9, and 17. These results suggest that Mif pseudogenes originated by retrotransposition. 46 refs., 5 figs., 1 tab.

Bozza, M.; Gerard, C.; Kolakowski, L.F. Jr. [Children`s Hospital, Boston, MA (United States)] [and others

1995-06-10

340

Expression and localization of the Parkin Co-Regulated Gene in mouse CNS suggests a role in ependymal cilia function  

Microsoft Academic Search

Parkin Co-Regulated Gene (PACRG) is a gene that shares a bi-directional promoter with the Parkinson's disease associated gene parkin. The functional role of PACRG is not well understood, although the gene has been associated with parkinsonian syndromes and more recently with eukaryotic cilia and flagella. We investigated the expression of Pacrg in the mouse brain by in situ hybridization and

Gabrielle R. Wilson; Jacqueline T. Tan; Kate M. Brody; Juliet M. Taylor; Martin B. Delatycki; Paul J. Lockhart

2009-01-01

341

Improved human disease candidate gene prioritization using mouse phenotype  

Microsoft Academic Search

Background: The majority of common diseases are multi-factorial and modified by genetically and mechanistically complex polygenic interactions and environmental factors. High-throughput genome-wide studies like linkage analysis and gene expression profiling, tend to be most useful for classification and characterization but do not provide sufficient information to identify or prioritize specific disease causal genes. Results: Extending on an earlier hypothesis that

Jing Chen; Huan Xu; Bruce J. Aronow; Anil G. Jegga

2007-01-01

342

Transgenic and Gene-Targeted Mouse Models for Pulmonary Hypertension  

Microsoft Academic Search

\\u000a Transgenic and gene-targeted models are ­capable of providing a much more specific molecular stimulus than models based on\\u000a hypoxia, toxins, or surgery. In a reductionist approach to understanding the roles of specific pathways in disease development,\\u000a this ability to isolate the consequences of deletion, haploinsufficiency, or mutation in particular genes provides extraordinary\\u000a power. This chapter is intended to provide an

James D. West

343

Patterned expression of ion channel genes in mouse dorsal raphe nucleus determined with the Allen Mouse Brain Atlas.  

PubMed

The dorsal raphe nucleus (DR) is the major source of serotonin (5-hydroxytryptamine, 5-HT) in the forebrain and dysfunction of this midbrain structure is implicated in affective disorders. The DR is composed of several types of 5-HT and non-5-HT neurons and their excitable-membrane properties are heterogeneous and overlapping. In order to understand how these properties may be generated, we examined the mRNA expression patterns of voltage- and ligand-gated ion channels in the DR using the Allen Mouse Brain Atlas. Since DR cytoarchitecture is organized with respect to the midline, we sought to identify genes that were expressed in a pattern with respect to the midline, either enriched or depleted, rather than those that were homogenously expressed throughout the DR. Less than 10% of the screened genes for voltage-gated ion channels showed patterned expression within the DR. Identified genes included voltage-gated sodium channel beta subunits, potassium channels, P/Q-, N-type calcium channels, as well as the alpha2/delta-1 calcium channel. Several voltage-gated chloride channels were also identified, although these may function within intracellular compartments. Of the ligand-gated ion channels examined, 20% showed patterned expression. These consisted primarily of glutamate and GABA-A receptor subunits. The identified genes likely contribute to unique excitable properties of different groups of neurons in the DR and may include novel pharmacologic targets for affective disorders. PMID:22534482

Templin, J Scott; Bang, Sun Jung; Soiza-Reilly, Mariano; Berde, Charles B; Commons, Kathryn G

2012-04-04

344

The mouse and human genes encoding the recognition component of the N-end rule pathway  

PubMed Central

The N-end rule relates the in vivo half-life of a protein to the identity of its N-terminal residue. The N-end rule pathway is one proteolytic pathway of the ubiquitin system. The recognition component of this pathway, called N-recognin or E3, binds to a destabilizing N-terminal residue of a substrate protein and participates in the formation of a substrate-linked multiubiquitin chain. We report the cloning of the mouse and human Ubr1 cDNAs and genes that encode a mammalian N-recognin called E3?. Mouse UBR1p (E3?) is a 1,757-residue (200-kDa) protein that contains regions of sequence similarity to the 225-kDa Ubr1p of the yeast Saccharomyces cerevisiae. Mouse and human UBR1p have apparent homologs in other eukaryotes as well, thus defining a distinct family of proteins, the UBR family. The residues essential for substrate recognition by the yeast Ubr1p are conserved in the mouse UBR1p. The regions of similarity among the UBR family members include a putative zinc finger and RING-H2 finger, another zinc-binding domain. Ubr1 is located in the middle of mouse chromosome 2 and in the syntenic 15q15-q21.1 region of human chromosome 15. Mouse Ubr1 spans ?120 kilobases of genomic DNA and contains ?50 exons. Ubr1 is ubiquitously expressed in adults, with skeletal muscle and heart being the sites of highest expression. In mouse embryos, the Ubr1 expression is highest in the branchial arches and in the tail and limb buds. The cloning of Ubr1 makes possible the construction of Ubr1-lacking mouse strains, a prerequisite for the functional understanding of the mammalian N-end rule pathway.

Kwon, Yong Tae; Reiss, Yuval; Fried, Victor A.; Hershko, Avram; Yoon, Jeong Kyo; Gonda, David K.; Sangan, Pitchai; Copeland, Neal G.; Jenkins, Nancy A.; Varshavsky, Alexander

1998-01-01

345

Human and Mouse ?-Synuclein Genes: Comparative Genomic Sequence Analysis and Identification of a Novel Gene Regulatory Element  

PubMed Central

The human ?-synuclein gene (SNCA) encodes a presynaptic nerve terminal protein that was originally identified as a precursor of the non-?-amyloid component of Alzheimer's disease plaques. More recently, mutations in SNCA have been identified in some cases of familial Parkinson's disease, presenting numerous new areas of investigation for this important disease. Molecular studies would benefit from detailed information about the long-range sequence context of SNCA. To that end, we have established the complete genomic sequence of the chromosomal regions containing the human and mouse ?-synuclein genes, with the objective of using the resulting sequence information to identify conserved regions of biological importance through comparative sequence analysis. These efforts have yielded ?146 and ?119 kb of high-accuracy human and mouse genomic sequence, respectively, revealing the precise genetic architecture of the ?-synuclein gene in both species. A simple repeat element upstream of SNCA/Snca has been identified and shown to be necessary for normal expression in transient transfection assays using a luciferase reporter construct. Together, these studies provide valuable data that should facilitate more detailed analysis of this medically important gene. [The genomic DNA sequence data described in this paper have been submitted to GenBank under accession nos. AF163864 (human) and AF163865 (mouse).

Touchman, Jeffrey W.; Dehejia, Anindya; Chiba-Falek, Ornit; Cabin, Deborah E.; Schwartz, Jody R.; Orrison, Bonnie M.; Polymeropoulos, Mihael H.; Nussbaum, Robert L.

2001-01-01

346

High-efficiency and heritable gene targeting in mouse by transcription activator-like effector nucleases.  

PubMed

Transcription activator-like effector nucleases (TALENs) are a powerful new approach for targeted gene disruption in various animal models, but little is known about their activities in Mus musculus, the widely used mammalian model organism. Here, we report that direct injection of in vitro transcribed messenger RNA of TALEN pairs into mouse zygotes induced somatic mutations, which were stably passed to the next generation through germ-line transmission. With one TALEN pair constructed for each of 10 target genes, mutant F0 mice for each gene were obtained with the mutation rate ranged from 13 to 67% and an average of ?40% of total healthy newborns with no significant differences between C57BL/6 and FVB/N genetic background. One TALEN pair with single mismatch to their intended target sequence in each side failed to yield any mutation. Furthermore, highly efficient germ-line transmission was obtained, as all the F0 founders tested transmitted the mutations to F1 mice. In addition, we also observed that one bi-allele mutant founder of Lepr gene, encoding Leptin receptor, had similar diabetic phenotype as db/db mouse. Together, our results suggest that TALENs are an effective genetic tool for rapid gene disruption with high efficiency and heritability in mouse with distinct genetic background. PMID:23630316

Qiu, Zhongwei; Liu, Meizhen; Chen, Zhaohua; Shao, Yanjiao; Pan, Hongjie; Wei, Gaigai; Yu, Chao; Zhang, Long; Li, Xia; Wang, Ping; Fan, Heng-Yu; Du, Bing; Liu, Bin; Liu, Mingyao; Li, Dali

2013-04-28

347

Molecular evolution of epididymal lipocalin genes localized on mouse chromosome 2.  

PubMed

We previously identified two murine secretory proteins, mE-RABP(Lcn5) and mEP17(Lcn8), belonging to the lipocalin family and specifically expressed in the epididymis. The genes are contiguous and localized on mouse chromosome 2. We now show that five other related lipocalin genes, Lcn9, Lcn10, Lcn11, Lcn12, and Lcn13, that evolved by in situ tandem duplication are present on the same locus. Lcn9, Lcn10, Lcn12, and Lcn13 genes, like Lcn5 and Lcn8 genes, are specifically expressed in the mouse epididymis. However, each gene has a distinct spatial expression within the epididymis and different regulation. Analysis of the human genome sequence shows the presence of genes encoding lipocalins with genomic organization, chromosomal arrangement, and orientation similar to that of the corresponding murine genes, indicating that the epididymal cluster is evolutionary conserved. A phylogenetic analysis of the new epididymal proteins reveals their spread position in the lipocalin protein family tree. This suggests the preservation of the regulatory sequences, while protein sequences have greatly diverged, reflecting functional diversity and possibly multifunctionality. In terms of the cluster ancestry, epididymal expression possibly appeared in a PGDS-like lipocalin in amniotes, and the duplications generating the cluster occurred at least in the common ancestor of rodents and primates. The presence and conservation of a cluster of five genes encoding epididymal lipocalins, differently regulated and regionalized in the epididymis, strongly suggests that these proteins may play an important role for male fertility. PMID:15363845

Suzuki, Kichiya; Lareyre, Jean-Jacques; Sánchez, Diego; Gutierrez, Gabriel; Araki, Yoshihiko; Matusik, Robert J; Orgebin-Crist, Marie-Claire

2004-09-15

348

Changes in gene expression associated with retinal degeneration in the rd3 mouse  

PubMed Central

Purpose To identify and characterize changes in gene expression associated with photoreceptor degeneration in the rd3 mouse model of Leber congenital amaurosis (LCA) type 12. Methods Global genome expression profiling using microarray technology was performed on total RNA extracts from rd3 and wild-type control mouse retinas at postnatal day 21. Quantitative PCR analysis of selected transcripts was performed to validate the microarray results. Results Functional annotation of differentially regulated genes in the rd3 mouse defined key canonical pathways, including phototransduction, glycerophospholipid metabolism, tumor necrosis factor receptor 1 signaling, and endothelin signaling. Overall, 1,140 of approximately 55,800 transcripts were differentially represented. In particular, a large percentage of the upregulated transcripts encode proteins involved in the immune response; whereas the downregulated transcripts encode proteins involved in phototransduction and lipid metabolism. Conclusions This analysis has elucidated several candidate genes and pathways, thus providing insight into the pathogenic mechanisms underlying the photoreceptor degeneration in the rd3 mouse retina and indicating directions for future studies.

Cheng, Christiana L.

2013-01-01

349

Gene Entropy-Fractal Dimension Informatics with Application to Mouse-Human Translational Medicine  

PubMed Central

DNA informatics represented by Shannon entropy and fractal dimension have been used to form 2D maps of related genes in various mammals. The distance between points on these maps for corresponding mRNA sequences in different species is used to study evolution. By quantifying the similarity of genes between species, this distance might be indicated when studies on one species (mouse) would tend to be valid in the other (human). The hypothesis that a small distance from mouse to human could facilitate mouse to human translational medicine success is supported by the studied ESR-1, LMNA, Myc, and RNF4 sequences. ID1 and PLCZ1 have larger separation. The collinearity of displacement vectors is further analyzed with a regression model, and the ID1 result suggests a mouse-chimp-human translational medicine approach. Further inference was found in the tumor suppression gene, p53, with a new hypothesis of including the bovine PKM2 pathways for targeting the glycolysis preference in many types of cancerous cells, consistent with quantum metabolism models. The distance between mRNA and protein coding CDS is proposed as a measure of the pressure associated with noncoding processes. The Y-chromosome DYS14 in fetal micro chimerism that could offer protection from Alzheimer's disease is given as an example.

Holden, T.; Cheung, E.; Dehipawala, S.; Ye, J.; Tremberger, G.; Lieberman, D.; Cheung, T.

2013-01-01

350

Gene entropy-fractal dimension informatics with application to mouse-human translational medicine.  

PubMed

DNA informatics represented by Shannon entropy and fractal dimension have been used to form 2D maps of related genes in various mammals. The distance between points on these maps for corresponding mRNA sequences in different species is used to study evolution. By quantifying the similarity of genes between species, this distance might be indicated when studies on one species (mouse) would tend to be valid in the other (human). The hypothesis that a small distance from mouse to human could facilitate mouse to human translational medicine success is supported by the studied ESR-1, LMNA, Myc, and RNF4 sequences. ID1 and PLCZ1 have larger separation. The collinearity of displacement vectors is further analyzed with a regression model, and the ID1 result suggests a mouse-chimp-human translational medicine approach. Further inference was found in the tumor suppression gene, p53, with a new hypothesis of including the bovine PKM2 pathways for targeting the glycolysis preference in many types of cancerous cells, consistent with quantum metabolism models. The distance between mRNA and protein coding CDS is proposed as a measure of the pressure associated with noncoding processes. The Y-chromosome DYS14 in fetal micro chimerism that could offer protection from Alzheimer's disease is given as an example. PMID:23586047

Holden, T; Cheung, E; Dehipawala, S; Ye, J; Tremberger, G; Lieberman, D; Cheung, T

2013-03-17

351

Mapping of the ARIX homeodomain gene to mouse chromosome 7 and human chromosome 11q13  

SciTech Connect

The recently described homeodomain protein ARIX is expressed specifically in noradreneric cell types of the sympathetic nervous system, brain, and adrenal medulla. ARIX interacts with regulatory elements of the genes encoding the noradrenergic biosynthetic enzymes tyrosine hydroxylase and dopamine {beta}-hydroxylase, suggesting a role for ARIX in expression of the noradrenergic phenotype. In the study described here, the mouse and human ARIX genes are mapped. Using segregation analysis of two panels of mouse backcross DNA, mouse Arix was positioned approximately 50 cM distal to the centromere of chromosome 7, near Hbb. Human ARIX was positioned through analysis of somatic cell hybrids and fluorescence in situ hybridization of human metaphase chromosomes to chromosome 7, near Hbb. Human ARIX was positioned through analysis of somatic cell hybrids and fluorescence in situ hybridization of human metaphase chromosomes to chromosome 11q13.3-q13.4. These map locations extend and further define regions of conserved synteny between mouse and human genomes and identify a new candidate gene for inherited developmental disorders linked to human 11q13.

Johnson, K.R. [Jackson Lab., Bar Harbor, ME (United States); Smith, L.; Rhodes, J. [Oregon Health Sciences Univ., Portland, OR (United States)] [and others

1996-05-01

352

Spontaneous mutations in the mouse Sharpin gene result in multiorgan inflammation, immune system dysregulation and dermatitis.  

PubMed

Homologues of the SHARPIN (SHANK-associated RH domain-interacting protein) gene have been identified in the human, rat and mouse genomes. SHARPIN and its homologues are expressed in many tissues. SHARPIN protein forms homodimers and associates with SHANK in the post-synaptic density of excitatory neurotransmitters in the brain. SHARPIN is hypothesized to have roles in the crosslinking of SHANK proteins and in enteric nervous system function. We demonstrate that two independently arising spontaneous mutations in the mouse Sharpin gene, cpdm and cpdm(Dem), cause a chronic proliferative dermatitis phenotype, which is characterized histologically by severe inflammation, eosinophilic dermatitis and defects in secondary lymphoid organ development. These are the first examples of disease-causing mutations in the Sharpin gene and demonstrate the importance of SHARPIN protein in normal immune development and control of inflammation. PMID:17538631

Seymour, R E; Hasham, M G; Cox, G A; Shultz, L D; Hogenesch, H; Roopenian, D C; Sundberg, J P

2007-05-31

353

Chromosomal localization of a new mouse lens opacity gene (lop18)  

SciTech Connect

Examination of mouse strains with a slit lamp and indirect ophthalmoscopy revealed that strain CBA/CaGnLe has a white cataract obvious at weaning age. It soon progresses to a large white nuclear cataract with mild cortical changes. Crosses with C57BL/GJ showed that this is inherited as a single recessive fully penetrant gene, which we have designated lop18 (lens opacity 18). Linkage analysis using visible marker T (brachyury), histocompatibility marker H2, and microsatellite markers D17MU21, D17MU28, D17MU38, and D17MU46 shows that the 1op18 gene is located, {approximately}16 cM from the centromere on mouse Chromosome 17. It is a likely candidate mutation for the {alpha}-crystallin (Cryal) gene. 14 refs., 1 fig., 1 tab.

Chang, Bo; Hawes, N.L.; Smith, R.S. [Jackson Lab., Bar Harbor, ME (United States)] [and others

1996-08-15

354

A role for metallothionein in the pathogenesis of diabetes and its cardiovascular complications.  

PubMed

It has been suspected for a long time that zinc has a role in various aspects of diabetes, but specific molecular targets of zinc remained largely elusive. Recent discoveries of associations between diabetes and polymorphisms in human genes now suggest that proteins that control the cellular availability of zinc ions are involved. One protein is the zinc transporter ZnT-8 that supplies pancreatic beta-cells with zinc. The other is metallothionein 1A, a member of a protein family that links zinc and redox metabolism. Changes in the availability of zinc ions modulate insulin signaling and redox processes. Both zinc and metallothionein protect cells against the redox stress that occurs in diabetes and contributes to its progression towards diabetic complications, including heart disease. PMID:18321746

Maret, Wolfgang

2008-03-05

355

Extraordinary Sequence Divergence at Tsga8, an X-linked Gene Involved in Mouse Spermiogenesis  

PubMed Central

The X chromosome plays an important role in both adaptive evolution and speciation. We used a molecular evolutionary screen of X-linked genes potentially involved in reproductive isolation in mice to identify putative targets of recurrent positive selection. We then sequenced five very rapidly evolving genes within and between several closely related species of mice in the genus Mus. All five genes were involved in male reproduction and four of the genes showed evidence of recurrent positive selection. The most remarkable evolutionary patterns were found at Testis-specific gene a8 (Tsga8), a spermatogenesis-specific gene expressed during postmeiotic chromatin condensation and nuclear transformation. Tsga8 was characterized by extremely high levels of insertion–deletion variation of an alanine-rich repetitive motif in natural populations of Mus domesticus and M. musculus, differing in length from the reference mouse genome by up to 89 amino acids (27% of the total protein length). This population-level variation was coupled with striking divergence in protein sequence and length between closely related mouse species. Although no clear orthologs had previously been described for Tsga8 in other mammalian species, we have identified a highly divergent hypothetical gene on the rat X chromosome that shares clear orthology with the 5? and 3? ends of Tsga8. Further inspection of this ortholog verified that it is expressed in rat testis and shares remarkable similarity with mouse Tsga8 across several general features of the protein sequence despite no conservation of nucleotide sequence across over 60% of the rat-coding domain. Overall, Tsga8 appears to be one of the most rapidly evolving genes to have been described in rodents. We discuss the potential evolutionary causes and functional implications of this extraordinary divergence and the possible contribution of Tsga8 and the other four genes we examined to reproductive isolation in mice.

Good, Jeffrey M.; Vanderpool, Dan; Smith, Kimberly L.; Nachman, Michael W.

2011-01-01

356

Inducible expression of encephalomyocarditis virus 3C protease activity in stably transformed mouse cell lines.  

PubMed Central

An inducible expression vector system has been developed to facilitate the study of the effects of individual virus gene products on cell function. The vector utilizes the mouse metallothionein promoter carried on the bovine papillomavirus genome. Conditions which optimize the induced expression of open reading frames inserted downstream from the mouse metallothionein promoter have recently been described. In this communication we describe the use of this system to clone and express the encephalomyocarditis virus 3C protease in cultured mouse cells. Stably transformed cell lines could be induced to produce levels of 3C protease activity comparable to those observed during normal virus infection. In spite of this, no effects on cellular protein synthesis rate or membrane permeability were observed. It was also discovered that 3C protease as well as 3C protease-containing polyproteins are turned over. This was true not only in the induced cell clones, but also during the normal course of encephalomyocarditis virus infection, as well as in translation systems in vitro. This phenomenon was highly specific for this family of polypeptides, perhaps explaining their apparent lack of cytotoxic effects. Images

Lawson, T G; Smith, L L; Palmenberg, A C; Thach, R E

1989-01-01

357

Human-Mouse Gene Identification by Comparative Evidence Integration and Evolutionary Analysis  

PubMed Central

The identification of genes in the human genome remains a challenge, as the actual predictions appear to disagree tremendously and vary dramatically on the basis of the specific gene-finding methodology used. Because the pattern of conservation in coding regions is expected to be different from intronic or intergenic regions, a comparative computational analysis can lead, in principle, to an improved computational identification of genes in the human genome by using a reference, such as mouse genome. However, this comparative methodology critically depends on three important factors: (1) the selection of the most appropriate reference genome. In particular, it is not clear whether the mouse is at the correct evolutionary distance from the human to provide sufficiently distinctive conservation levels in different genomic regions, (2) the selection of comparative features that provide the most benefit to gene recognition, and (3) the selection of evidence integration architecture that effectively interprets the comparative features. We address the first question by a novel evolutionary analysis that allows us to explicitly correlate the performance of the gene recognition system with the evolutionary distance (time) between the two genomes. Our simulation results indicate that there is a wide range of reference genomes at different evolutionary time points that appear to deliver reasonable comparative prediction of human genes. In particular, the evolutionary time between human and mouse generally falls in the region of good performance; however, better accuracy might be achieved with a reference genome further than mouse. To address the second question, we propose several natural comparative measures of conservation for identifying exons and exon boundaries. Finally, we experiment with Bayesian networks for the integration of comparative and compositional evidence.

Zhang, Lingang; Pavlovic, Vladimir; Cantor, Charles R; Kasif, Simon

2003-01-01

358

Effect of microgravity on gene expression in mouse brain  

PubMed Central

Changes in gravitational force such as that experienced by astronauts during space flight induce a redistribution of fluids from the caudad to the cephalad portion of the body together with an elimination of normal head-to-foot hydrostatic pressure gradients. To assess brain gene profile changes associated with microgravity and fluid shift, a large-scale analysis of mRNA expression levels was performed in the brains of 2-week control and hindlimb-unloaded (HU) mice using cDNA microarrays. Although to different extents, all functional categories displayed significantly regulated genes indicating that considerable transcriptomic alterations are induced by HU. Interestingly, the TIC class (transport of small molecules and ions into the cells) had the highest percentage of up-regulated genes, while the most down-regulated genes were those of the JAE class (cell junction, adhesion, extracellular matrix). TIC genes comprised 16% of those whose expression was altered, including sodium channel, nonvoltage-gated 1 beta (Scnn1b), glutamate receptor (Grin1), voltage-dependent anion channel 1 (Vdac1), calcium channel beta 3 subunit (Cacnb3) and others. The analysis performed by Gene-MAPP revealed several altered protein classes and functional pathways such as blood coagulation and immune response, learning and memory, ion channels and cell junction. In particular, data indicate that HU causes an alteration in hemostasis which resolves in a shift toward a more hyper-coagulative state with an increased risk of venous thrombosis. Furthermore, HU treatment seems to impact on key steps of synaptic plasticity and learning processes.

Iacobas, Dumitru A.; Iacobas, Sanda; Nicchia, Grazia Paola; Desaphy, Jean Francois; Camerino, Diana Conte; Svelto, Maria; Spray, David C.

2009-01-01

359

Tamoxifen administration routes and dosage for inducible Cre-mediated gene disruption in mouse hearts  

Microsoft Academic Search

Tissue-specific and time-dependent control of in vivo gene disruption may be achieved using conditional knockout strategies\\u000a in transgenic mice. Fusion of mutant estrogen receptor ligand-binding domains to Cre recombinase (Cre-ERT, MerCreMer) combined with cardiac-directed gene expression has been used to generate several cardiac-specific tamoxifen-inducible\\u000a Cre-expressing mouse lines. Such mice have successfully been used to generate Cre-loxP-mediated gene disruption in an

Kristin B. AnderssonLisbeth; Lisbeth H. Winer; Halvor K. Mørk; Jeffery D. Molkentin; Frédéric Jaisser

2010-01-01

360

In vivo identification of a negative regulatory element in the mouse renin gene using direct gene transfer.  

PubMed Central

DBA/2J mouse contains two renin gene loci (Ren1d and Ren2d). Ren2d but not Ren1d is expressed in submandibular gland (SMG) while both are expressed in the kidney. Based on vitro studies, we have postulated that a negative regulatory element (NRE) in the renin gene promoter is involved in its tissue-specific expression. In this study, we examined the molecular mechanism at the in vivo level using direct gene transfer. Fragments of the Ren1d or Ren2d promoter were fused to a chloramphenicol acetyltransferase (CAT) gene expression vector. These constructs complexed in fusogenic liposomes were injected directly into the mouse SMG or intraarterially into the mouse kidney via the renal artery. The vector containing the CAT exhibited readily detectable in vivo expressions in both SMG and kidney. In the SMG, Ren1d fragment containing the NRE abolished CAT expression while deletion of the NRE restored CAT expression. The homologous fragment from the Ren2d promoter did not inhibit CAT expression while deletion of the 150-bp insertion resulted in the inhibition. Cotransfection of Ren1d construct with Ren1d-NRE oligonucleotides as transcriptional factor decoy restored CAT expression. Contrary to the SMG, transfection with Ren1d fragment-CAT construct or Ren2d fragment-CAT construct into the kidney resulted in similar levels of CAT expression. Interestingly, human c-myc NRE oligonucleotides which share homology with Ren1d-NRE competed effectively with these oligonucleotides for the regulation of Ren1d gene expression in vivo. This NRE sequence is also homologous to silencer elements found in multiple mammalian genes, suggesting the presence of a family of NRE/NRE binding proteins regulating expression of diverse genes. Images

Yamada, T; Horiuchi, M; Morishita, R; Zhang, L; Pratt, R E; Dzau, V J

1995-01-01

361

Identification of candidate genes for human retinal degeneration loci using differentially expressed genes from mouse photoreceptor dystrophy models  

PubMed Central

Purpose Retinal degeneration (RD) is a complex mechanism that appears to involve many biologic processes including oxidative stress, apoptosis, and cellular remodeling. Currently there are 51 mapped, but not identified, RD human disease loci. Methods To assign possible disease genes to RD loci, we have used a comparative genomics procedure that incorporates microarray gene expression data of three independent mouse models for photoreceptor dystrophy (rd1, rd2, and constant light-damage in BALB/c mice), human ortholog data, and databases of known chromosomal locations involved in human RD. Immunohistochemistry and enzyme activity assays were used to further characterize a candidate gene product. Results Our analysis yielded candidate genes for four mapped, but unsolved, human chromosomal locations and confirmed two previously identified monogenic disease loci for human RD, thus validating our approach. PLA2G7 (phospholipase A2, group VII; PAF-AH, Lp-PLA2), a candidate for a dominant form macular dystrophy (Benign Concentric Annular Macular Dystrophy [BCMAD]), was selected for further study. The PLA2G7 enzyme is known to mediate breakdown of oxidatively damaged phospholipids, a contributor to oxidative stress in the retina. PLA2G7 protein was enriched in mouse photoreceptor inner and outer segments. In the rd1, rd2, and BALB/c mice exposed to constant light, retinal tissue activity levels, but not plasma levels, were significantly reduced at the onset of photoreceptor cell death. Conclusions We have shown that this comparative genomics approach verified existing RD genes as well as identified novel RD candidate genes. The results on the characterization of the PLA2G7 protein, one of the novel RD genes, suggests that retinal tissue PLA2G7 levels may constitute an important risk factor for BCMAD. In summary, this reverse mapping approach, using accepted mouse models of human disease and known human RD loci, may prove useful in identifying possible novel disease candidates for RD and may be applicable to other human diseases.

Demos, Christina; Bandyopadhyay, Mausumi

2008-01-01

362

Gene transfer to the developing mouse inner ear by in vivo electroporation.  

PubMed

The mammalian inner ear has 6 distinct sensory epithelia: 3 cristae in the ampullae of the semicircular canals; maculae in the utricle and saccule; and the organ of Corti in the coiled cochlea. The cristae and maculae contain vestibular hair cells that transduce mechanical stimuli to subserve the special sense of balance, while auditory hair cells in the organ of Corti are the primary transducers for hearing. Cell fate specification in these sensory epithelia and morphogenesis of the semicircular canals and cochlea take place during the second week of gestation in the mouse and are largely completed before birth. Developmental studies of the mouse inner ear are routinely conducted by harvesting transgenic embryos at different embryonic or postnatal stages to gain insight into the molecular basis of cellular and/or morphological phenotypes. We hypothesize that gene transfer to the developing mouse inner ear in utero in the context of gain- and loss-of-function studies represents a complimentary approach to traditional mouse transgenesis for the interrogation of the genetic mechanisms underlying mammalian inner ear development(6). The experimental paradigm to conduct gene misexpression studies in the developing mouse inner ear demonstrated here resolves into three general steps: 1) ventral laparotomy; 2) transuterine microinjection; and 3) in vivo electroporation. Ventral laparotomy is a mouse survival surgical technique that permits externalization of the uterus to gain experimental access to the implanted embryos. Transuterine microinjection is the use of beveled, glass capillary micropipettes to introduce expression plasmid into the lumen of the otic vesicle or otocyst. In vivo electroporation is the application of square wave, direct current pulses to drive expression plasmid into progenitor cells. We previously described this electroporation-based gene transfer technique and included detailed notes on each step of the protocol(11). Mouse experimental embryological techniques can be difficult to learn from prose and still images alone. In the present work, we demonstrate the 3 steps in the gene transfer procedure. Most critically, we deploy digital video microscopy to show precisely how to: 1) identify embryo orientation in utero; 2) reorient embryos for targeting injections to the otocyst; 3) microinject DNA mixed with tracer dye solution into the otocyst at embryonic days 11.5 and 12.5; 4) electroporate the injected otocyst; and 5) label electroporated embryos for postnatal selection at birth. We provide representative examples of successfully transfected inner ears; a pictorial guide to the most common causes of otocyst mistargeting; discuss how to avoid common methodological errors; and present guidelines for writing an in utero gene transfer animal care protocol. PMID:22781586

Wang, Lingyan; Jiang, Han; Brigande, John V

2012-06-30

363

Placental Gene Expression Responses to Maternal Protein Restriction in the Mouse  

PubMed Central

OBJECTIVE Maternal protein restriction has been shown to have deleterious effects on placental development, and has long-term consequences for the progeny. We tested the hypothesis that, by the use of microarray technology, we could identify specific genes and cellular pathways in the developing placenta that are responsive to maternal protein deprivation, and propose a potential mechanism for observed gene expression changes. METHODS We fed pregnant FVB/NJ mice from day post coitum 10.5 (DPC10.5) to DPC17.5, an isocaloric diet containing 50% less protein than normal chow. We used the Affymetrix Mouse 430A_2.0 array to measure gene expression changes in the placenta. We functionally annotated the regulated genes, and examined over-represented functional categories and performed pathway analysis. For selected genes, we confirmed the microarray results by use of qPCR. RESULTS We observed 244 probe sets, corresponding to 235 genes, regulated by protein restriction (p < 0.001), with ninety-one genes being up-regulated, and 153 down-regulated. Up-regulated genes included those involved in the p53 pathway, apoptosis, negative regulators of cell growth, negative regulators of cell metabolism and genes related to epigenetic control. Down-regulated genes included those involved in nucleotide metabolism. CONCLUSIONS Microarray analysis has allowed us to describe the genetic response to maternal protein deprivation in the mouse placenta. We observed that negative regulators of cell growth and metabolism in conjunction with genes involved in epigenesis were up-regulated, suggesting that protein deprivation may contribute to growth restriction and long-term epigenetic changes in stressed tissues and organs. The challenge will be to understand the cellular and molecular mechanisms of these gene expression responses.

Gheorghe, Ciprian P.; Goyal, Ravi; Holweger, Joshua D.; Longo, Lawrence D.

2009-01-01

364

Differential gene expression by Osterix knockdown in mouse chondrogenic ATDC5 cells.  

PubMed

Osterix (Osx) is a transcription factor required for osteoblast differentiation during intramembranous and endochondral ossification. Recently, several reports have described novel functions of Osx in chondrocyte differentiation. In an in vitro study, in which the effects of Osx gene silencing were examined in mouse chondrogenic ATDC5 cells, chondrocyte marker genes were found to be expressionally downregulated and chondrocyte differentiation reduced. On the other hand, in vivo studies based on chondrocyte-specific Osx knockouts demonstrated impaired endochondral bone formation with delayed chondrocyte differentiation and reduced cartilage matrix ossification. However, little is known about the mechanism or targets of Osx involved in the control of chondrocyte differentiation. Here, we attempted to high-density of Affymetrix GeneChip microarray to investigate global gene expression profile changes caused by Osx knockdown in ATDC5 chondrocytes. The mRNA expressions of 112 genes were significantly modified by Osx knockdown: 68 genes were upregulated and 44 genes downregulated. Functional categories of gene expression classified by gene ontology demonstrated that genes related to cell adhesion, development, and signal transduction were highly affected by Osx knockdown. The expressions of differential genes, such as Sfrp2, Sema3a, Nox4, Rgs4, Zfp521, Has2, Sox6, Scn2a1, Sirpa, and Thbs2, were validated by quantitative real-time PCR. This study shows that expression profiling can be used to identify genes that are transcriptionally modified following Osx knockdown and to reveal the molecular mechanism of chondrocyte differentiation regulated by Osx. PMID:23337593

Park, Seung-Yoon; Kim, Jung-Eun

2013-01-19

365

Dynamics of Global Gene Expression Changes during Mouse Preimplantation Development  

Microsoft Academic Search

Understanding preimplantation development is important both for basic reproductive biology and for practical applications including regenerative medicine and livestock breeding. Global expression profiles revealed and characterized the distinctive patterns of maternal RNA degradation and zygotic gene activation, including two major transient waves of de novo transcription. The first wave corresponds to zygotic genome activation (ZGA); the second wave, named mid-preimplantation

Toshio Hamatani; Mark G. Carter; Alexei A. Sharov; Minoru S. H. Ko

2004-01-01

366

Transcriptional oscillation of canonical clock genes in mouse peripheral tissues  

Microsoft Academic Search

BACKGROUND: The circadian rhythm of about 24 hours is a fundamental physiological function observed in almost all organisms from prokaryotes to humans. Identification of clock genes has allowed us to study the molecular bases for circadian behaviors and temporal physiological processes such as hormonal secretion, and has prompted the idea that molecular clocks reside not only in a central pacemaker,

Takuro Yamamoto; Yasukazu Nakahata; Haruhiko Soma; Makoto Akashi; Takayoshi Mamine; Toru Takumi

2004-01-01

367

Lessons on conditional gene targeting in mouse adipose tissue.  

PubMed

Conditional gene targeting has been extensively used for in vivo analysis of gene function in adipocyte cell biology but often with debate over the tissue specificity and the efficacy of inactivation. To directly compare the specificity and efficacy of different Cre lines in mediating adipocyte specific recombination, transgenic Cre lines driven by the adipocyte protein 2 (aP2) and adiponectin (Adipoq) gene promoters, as well as a tamoxifen-inducible Cre driven by the aP2 gene promoter (iaP2), were bred to the Rosa26R (R26R) reporter. All three Cre lines demonstrated recombination in the brown and white fat pads. Using different floxed loci, the individual Cre lines displayed a range of efficacy to Cre-mediated recombination that ranged from no observable recombination to complete recombination within the fat. The Adipoq-Cre exhibited no observable recombination in any other tissues examined, whereas both aP2-Cre lines resulted in recombination in endothelial cells of the heart and nonendothelial, nonmyocyte cells in the skeletal muscle. In addition, the aP2-Cre line can lead to germline recombination of floxed alleles in ~2% of spermatozoa. Thus, different "adipocyte-specific" Cre lines display different degrees of efficiency and specificity, illustrating important differences that must be taken into account in their use for studying adipose biology. PMID:23321074

Lee, Kevin Y; Russell, Steven J; Ussar, Siegfried; Boucher, Jeremie; Vernochet, Cecile; Mori, Marcelo A; Smyth, Graham; Rourk, Michael; Cederquist, Carly; Rosen, Evan D; Kahn, Barbara B; Kahn, C Ronald

2013-01-15

368

HFE Gene Knockout Produces Mouse Model of Hereditary Hemochromatosis  

Microsoft Academic Search

Hereditary hemochromatosis (HH) is a common autosomal recessive disease characterized by increased iron absorption and progressive iron storage that results in damage to major organs in the body. Recently, a candidate gene for HH called HFE encoding a major histocompatibility complex class I-like protein was identified by positional cloning. Nearly 90% of Caucasian HH patients have been found to be

Xiao Yan Zhou; Shunji Tomatsu; Robert E. Fleming; Seppo Parkkila; Abdul Waheed; Jinxing Jiang; Ying Fei; Elizabeth M. Brunt; David A. Ruddy; Cynthia E. Prass; Randall C. Schatzman; Rosemary O'Neill; Robert S. Britton; Bruce R. Bacon; William S. Sly

1998-01-01

369

Cloning and Characterization of the Mouse and Human Enamelin Genes  

Microsoft Academic Search

Enamelin is likely to be essential for proper dental enamel formation. It is secreted by ameloblasts throughout the secretory stage and can readily be isolated from the enamel matrix of developing teeth. The gene encoding human enamelin is located on the long arm of chromosome 4, in a region previously linked to an autosomal-dominant form of amelogenesis imperfecta (AI). To

J. C.-C. Hu; C. H. Zhang; Y. Yang; C. Kärrman-MÅrdh; K. Forsman-Semb; J. P. Simmer

2001-01-01

370

The mouse dead-end gene isoform ? is necessary for germ cell and embryonic viability  

PubMed Central

Inactivation of the dead-end (Dnd1) gene in the Ter mouse strain results in depletion of primordial germ cells (PGCs) so that mice become sterile. However, on the 129 mouse strain background, loss of Dnd1 also increases testicular germ cell tumor incidence in parallel to PGC depletion. We report that inactivation of Dnd1 also affects embryonic viability in the 129 strain. Mouse Dnd1 encodes two protein isoforms, DND1-isoform ? (DND1- ?) and DND1-isoform ? (DND1-?). Using isoform specific antibodies, we determined DND1-? is expressed in embryos and embryonic gonads whereas DND1-? expression is restricted to germ cells of the adult testis. Our data implicates DND1-? isoform to be necessary for germ cell viability and therefore its loss in Ter mice results in PGC depletion, germ cell tumor development and partial embryonic lethality in the 129 strain.

Bhattacharya, Chitralekha; Aggarwal, Sita; Zhu, Rui; Kumar, Madhu; Zhao, Ming; Meistrich, Marvin L.; Matin, Angabin

2007-01-01

371

Nkx3.1 and Myc crossregulate shared target genes in mouse and human prostate tumorigenesis  

PubMed Central

Cooperativity between oncogenic mutations is recognized as a fundamental feature of malignant transformation, and it may be mediated by synergistic regulation of the expression of pro- and antitumorigenic target genes. However, the mechanisms by which oncogenes and tumor suppressors coregulate downstream targets and pathways remain largely unknown. Here, we used ChIP coupled to massively parallel sequencing (ChIP-seq) and gene expression profiling in mouse prostates to identify direct targets of the tumor suppressor Nkx3.1. Further analysis indicated that a substantial fraction of Nkx3.1 target genes are also direct targets of the oncoprotein Myc. We also showed that Nkx3.1 and Myc bound to and crossregulated shared target genes in mouse and human prostate epithelial cells and that Nkx3.1 could oppose the transcriptional activity of Myc. Furthermore, loss of Nkx3.1 cooperated with concurrent overexpression of Myc to promote prostate cancer in transgenic mice. In human prostate cancer patients, dysregulation of shared NKX3.1/MYC target genes was associated with disease relapse. Our results indicate that NKX3.1 and MYC coregulate prostate tumorigenesis by converging on, and crossregulating, a common set of target genes. We propose that coregulation of target gene expression by oncogenic/tumor suppressor transcription factors may represent a general mechanism underlying the cooperativity of oncogenic mutations during tumorigenesis.

Anderson, Philip D.; McKissic, Sydika A.; Logan, Monica; Roh, Meejeon; Franco, Omar E.; Wang, Jie; Doubinskaia, Irina; van Meer, Riet; Hayward, Simon W.; Eischen, Christine M.; Eltoum, Isam-Eldin; Abdulkadir, Sarki A.

2012-01-01

372

Oocyte-specific expression of mouse Zp-2: developmental regulation of the zona pellucida genes.  

PubMed Central

The zona pellucida surrounds all mammalian oocytes and plays a vital role at fertilization and in early development. The genes that code for two of the mouse zona proteins (ZP2 and ZP3) represent a developmentally regulated set of genes whose expression serves as markers of mouse oocyte growth and differentiation. We previously characterized the single-copy Zp-3 gene and showed that its expression is oocyte specific and restricted to a narrow window of oocyte development. We now define the Zp-2 gene transcript and show that it is coordinately expressed with Zp-3 only during the 2-week growth phase of oogenesis that occurs prior to ovulation. Like Zp-3, the expression of Zp-2 is restricted to oocytes, and, although not detectable in resting oocytes, both ZP2 and ZP3 transcripts accumulate to become very abundant messengers in 50-microns-diameter oocytes. Ovulated eggs contain ZP2 and ZP3 transcripts which are 200 nucleotides shorter than those found in growing oocytes and have an abundance of less than 5% of the peak levels. In an attempt to understand the molecular details associated with the developmentally regulated, tissue-specific gene expression of the zona genes, the Zp-2 genetic locus has been characterized and its 5' flanking sequences have been compared with those of Zp-3. Both genes contain three short (8- to 12-base-pair) DNA sequences of 80 to 88% identity located within 250 base pairs of their transcription start sites. Images

Liang, L F; Chamow, S M; Dean, J

1990-01-01

373

Physical and genetic localization of the gene encoding the AP-2 transcription factor to mouse chromosome 13  

SciTech Connect

Transcription factors are a major determinant of developmental fate. The chromosomal localization of the genes encoding these proteins provides important information that can link them to known genetic abnormalities. Here, we report the mapping of the mouse gene for transcription factor AP-2, a protein that has been implicated in human oncogenesis. Using FISH, we have mapped the gene encoding the transcription factor AP-2, Tcfap2, to mouse Chromosome 13A5-B1. We have also extended this analysis by placing Tcfap2 on the mouse mutations that map in the vicinity of this transcription factor. 25 refs., 2 figs., 1 tab.

Warren, G. [Yale Univ., New Haven, CT (United States); Gordon, M.; Siracusa, L.D. [Jefferson Cancer Institute, Philadelphia, PA (United States)] [and others

1996-01-15

374

The gene encoding PBP74/CSA/motalin-1, a novel mouse hsp70, maps to mouse chromosome 18  

SciTech Connect

The 70-kDa heat shock proteins (hsp70) function in folding of peptides and the assembly and disassembly of protein complexes. They are encoded by a multigene family comprising both heat-inducible and constitutively expressed genes. Different family members function in different organelles: hsp70 members such as hsp70 and hsc70 are present in the cytoplasm, BiP/GRP78 in the endoplasmic reticulum, and GRP75 in the mitochondria. PBP74/CSA/motalin-1 is a novel mouse hsp70 protein that was identified by three different groups. PBP74 was found to be a peptide-binding protein implicated in antigen processing. CSA is an antigen specific for the CM strain, and motalin-1 is a protein associated with cellular mortality. 10 refs., 1 fig.

Ohashi, Manabu; Oyanagi, Mitsuru; Kominami, Ryo [Niigata Univ. School of Medicine (Japan)] [and others

1995-11-20

375

Differences in tissue-specific and embryonic expression of mouse Ceacam1 and Ceacam2 genes.  

PubMed Central

The intercellular adhesion molecule CEACAM1, also known as C-CAM1 (where CAM is cell-adhesion molecule), can function as a tumour suppressor in several carcinomas, including those of the prostate, breast, bladder and colon. This suggests that CEACAM1 may play an important role in the regulation of normal cell growth and differentiation. However, there is no direct evidence to support this putative function of CEACAM1. To elucidate its physiological function by targeted gene deletion, we isolated the Ceacam genes from a mouse 129 Sv/Ev library. Although there is only one Ceacam1 gene in humans and one in rats, two homologous genes (Ceacam1 and Ceacam2) have been identified in the mouse. Our sequence analysis revealed that the genes encoded nine exons and spanned approx. 16-17 kb (Ceacam1) and 25 kb (Ceacam2). The genes were highly similar (79.6%). The major differences in the protein-coding regions were located in exons 2, 5 and 6 (76.9%, 87.0% and 78.5% similarity respectively). In addition, introns 2, 5 and 7 were also significantly different, being 29.7%, 59.8% and 64.5% similar respectively. While most of these differences were due to nucleotide substitutions, two insertions of 418 and 5849 bp occurred in intron 2 of Ceacam2, and another two insertions of 1384 and 197 bp occurred in introns 5 and 7 respectively. To determine whether functional redundancy exists between Ceacam1 and Ceacam2, we examined their expression in 16 mouse tissues by using semi-quantitative reverse transcription-PCR. As in human and rat, in the mouse Ceacam1 mRNA was highly abundant in the liver, small intestine, prostate and spleen. In contrast, Ceacam2 mRNA was only detected in kidney, testis and, to a lesser extent, spleen. Reverse transcription-PCR using testis RNA indicated that Ceacam2 in the testis is an alternatively spliced form containing only exons 1, 2, 5, 6, 8 and 9. In the mouse embryo, Ceacam1 mRNA was detected at day 8.5, disappeared between days 9.5 and 12.5, and re-appeared at day 19. On the other hand, no Ceacam2 mRNA was detected throughout embryonic development. The different tissue expression patterns and regulation during embryonic development suggest that the CEACAM1 and CEACAM2 proteins, although highly similar, may have different functions both during mouse development and in adulthood.

Han, E; Phan, D; Lo, P; Poy, M N; Behringer, R; Najjar, S M; Lin, S H

2001-01-01

376

All kinesin superfamily protein, KIF, genes in mouse and human  

PubMed Central

Intracellular transport is essential for morphogenesis and functioning of the cell. The kinesin superfamily proteins (KIFs) have been shown to transport membranous organelles and protein complexes in a microtubule- and ATP-dependent manner. More than 30 KIFs have been reported in mice. However, the nomenclature of KIFs has not been clearly established, resulting in various designations and redundant names for a single KIF. Here, we report the identification and classification of all KIFs in mouse and human genome transcripts. Previously unidentified murine KIFs were found by a PCR-based search. The identification of all KIFs was confirmed by a database search of the total human genome. As a result, there are a total of 45 KIFs. The nomenclature of all KIFs is presented. To understand the function of KIFs in intracellular transport in a single tissue, we focused on the brain. The expression of 38 KIFs was detected in brain tissue by Northern blotting or PCR using cDNA. The brain, mainly composed of highly differentiated and polarized cells such as neurons and glia, requires a highly complex intracellular transport system as indicated by the increased number of KIFs for their sophisticated functions. It is becoming increasingly clear that the cell uses a number of KIFs and tightly controls the direction, destination, and velocity of transportation of various important functional molecules, including mRNA. This report will set the foundation of KIF and intracellular transport research.

Miki, Harukata; Setou, Mitsutoshi; Kaneshiro, Kiyofumi; Hirokawa, Nobutaka

2001-01-01

377

Peripherin: An Islet Antigen that is Cross-Reactive with Nonobese Diabetic Mouse Class II Gene Products  

Microsoft Academic Search

The nonobese diabetic (NOD) mouse, in which major histocompatibility complex genes may be involved in the susceptibility to diabetes, has been developed as a model of autoimmune diabetes. The NOD mouse expresses I-A-encoded class II major histocompatibility complex antigens, which differ from those of other mouse haplotypes by the presence of a serine at position 57 of the A_beta chain.

C. Boitard; M. C. Villa; C. Becourt; H. Pham Gia; C. Huc; P. Sempe; M. M. Portier; J. F. Bach

1992-01-01

378

Inducible Cardiomyocyte-Specific Gene Disruption Directed by the Rat Tnnt2 Promoter in the Mouse  

PubMed Central

We developed a conditional and inducible gene knockout methodology that allows effective gene deletion in mouse cardiomyocytes. This transgenic mouse line was generated by co-injection of two transgenes, a “reverse” tetracycline-controlled transactivator (rtTA) directed by a rat cardiac troponin T (Tnnt2) promoter and a Cre recombinase driven by a tetracycline-responsive promoter (TetO). Here, Tnnt2-rtTA activated TetO-Cre expression takes place in cardiomyocytes following doxycycline treatment. Using two different mouse Cre reporter lines, we demonstrated that expression of Cre recombinase was specifically and robustly induced in the cardiomyocytes of embryonic or adult hearts following doxycycline induction, thus, allowing cardiomyocyte-specific gene disruption and lineage tracing. We also showed that rtTA expression and doxycycline treatment did not compromise cardiac function. These features make the Tnnt2-rtTA;TetO-Cre transgenic line a valuable genetic tool for analysis of spatiotemporal gene function and cardiomyocyte lineage tracing during developmental and postnatal periods.

Wu, Bingruo; Zhou, Bin; Wang, Yidong; Cheng, Hsiu-Ling; Hang, Calvin T.; Pu, William T.; Chang, Ching-Pin; Zhou, Bin

2009-01-01

379

Burkholderia pseudomallei infection induces the expression of apoptosis-related genes and proteins in mouse macrophages.  

PubMed

BACKGROUND/PURPOSE: In this study, we addressed whether the production of apoptosis-related genes and proteins is induced in mouse macrophages infected with Burkholderia pseudomallei cells. METHODS: Mouse macrophages were infected with B. pseudomallei cells at 0.5 hours, 1 hour, 2 hours, 4 hours, and 6 hours, respectively, followed by real-time polymerase chain reaction (PCR) array analysis. The amount of apoptosis-related proteins (caspase-3, caspase -8, caspase -9, Bax, and Bcl-2) was confirmed by Western blot. RESULTS: After infection, an increase of these proteins was observed. The expression levels of other apoptosis-related genes were also determined by PCR array. Experimental results revealed that the messenger RNA levels of tumor necrosis factor ligand (e.g., tnfsf10 and tnfrs10b) and fas were increased, whereas the expression levels of some antiapoptosis genes such as Birc5, Hells, and Bnip3 were decreased. CONCLUSION: Our study results demonstrate that the apoptosis-related genes and proteins in mouse macrophages were modulated by B. pseudomallei. PMID:23751765

Hseu, You-Cheng; Sung, Jia-Chuen; Shieh, Bao-Sen; Chen, Ssu Ching

2013-06-01

380

Inducible cardiomyocyte-specific gene disruption directed by the rat Tnnt2 promoter in the mouse.  

PubMed

We developed a conditional and inducible gene knockout methodology that allows effective gene deletion in mouse cardiomyocytes. This transgenic mouse line was generated by coinjection of two transgenes, a "reverse" tetracycline-controlled transactivator (rtTA) directed by a rat cardiac troponin T (Tnnt2) promoter and a Cre recombinase driven by a tetracycline-responsive promoter (TetO). Here, Tnnt2-rtTA activated TetO-Cre expression takes place in cardiomyocytes following doxycycline treatment. Using two different mouse Cre reporter lines, we demonstrated that expression of Cre recombinase was specifically and robustly induced in the cardiomyocytes of embryonic or adult hearts following doxycycline induction, thus, allowing cardiomyocyte-specific gene disruption and lineage tracing. We also showed that rtTA expression and doxycycline treatment did not compromise cardiac function. These features make the Tnnt2-rtTA;TetO-Cre transgenic line a valuable genetic tool for analysis of spatiotemporal gene function and cardiomyocyte lineage tracing during developmental and postnatal periods. PMID:20014345

Wu, Bingruo; Zhou, Bin; Wang, Yidong; Cheng, Hsiu-Ling; Hang, Calvin T; Pu, William T; Chang, Ching-Pin; Zhou, Bin

2010-01-01

381

Bisphenol A exposure modifies DNA methylation of imprint genes in mouse fetal germ cells.  

PubMed

Bisphenol A (BPA) is an estrogenic environmental toxin widely used for the production of plastics. Human frequent exposure to this chemical has been proposed to be a potential public health risk. The objective of this study was to assess the effects of BPA on DNA methylation of imprinting genes in fetal mouse germ cell. Pregnant mice were treated with BPA at doses of 0, 40, 80 and 160 ?g BPA/kg body weight/day from 0.5 day post coitum. DNA methylation of imprinting genes, Igf2r, Peg3 and H19, was decreased with the increase of BPA concentration in fetal mouse germ cells (p < 0.01).The relative mRNA levels of Nobox were lower in BPA-treated group compared to control (BPA free) in female fetal germ cells, but in male fetal germ cells, a significant higher in Nobox expression was observed in BPA-treated group compared to control. Decreased mRNA expression of specific meiotic genes including Stimulated by Stra8 and Dazl were obtained in the female fetal germ cells. In conclusion, BPA exposure can affect the DNA methylation of imprinting genes in fetal mouse germ cells. PMID:22699882

Zhang, Xi-Feng; Zhang, Lian-Jun; Feng, Yan-Ni; Chen, Bo; Feng, Yan-Min; Liang, Gui-Jin; Li, Lan; Shen, Wei

2012-06-15

382

Nlrp2, a Maternal Effect Gene Required for Early Embryonic Development in the Mouse  

PubMed Central

Maternal effect genes encode proteins that are produced during oogenesis and play an essential role during early embryogenesis. Genetic ablation of such genes in oocytes can result in female subfertility or infertility. Here we report a newly identified maternal effect gene, Nlrp2, which plays a role in early embryogenesis in the mouse. Nlrp2 mRNAs and their proteins (?118 KDa) are expressed in oocytes and granulosa cells during folliculogenesis. The transcripts show a striking decline in early preimplantation embryos before zygotic genome activation, but the proteins remain present through to the blastocyst stage. Immunogold electron microscopy revealed that the NLRP2 protein is located in the cytoplasm, nucleus and close to nuclear pores in the oocytes, as well as in the surrounding granulosa cells. Using RNA interference, we knocked down Nlrp2 transcription specifically in mouse germinal vesicle oocytes. The knockdown oocytes could progress through the metaphase of meiosis I and emit the first polar body. However, the development of parthenogenetic embryos derived from Nlrp2 knockdown oocytes mainly blocked at the 2-cell stage. The maternal depletion of Nlrp2 in zygotes led to early embryonic arrest. In addition, overexpression of Nlrp2 in zygotes appears to lead to normal development, but increases blastomere apoptosis in blastocysts. These results provide the first evidence that Nlrp2 is a member of the mammalian maternal effect genes and required for early embryonic development in the mouse.

Peng, Hui; Chang, Bohao; Lu, Chenglong; Su, Jianmin; Wu, Yongyan; Lv, Pin; Wang, Yongsheng; Liu, Jun; Zhang, Bowei; Quan, Fusheng; Guo, Zekun; Zhang, Yong

2012-01-01

383

The genetic mapping and gene structure of mouse paraoxonase/arylesterase  

SciTech Connect

The physiological role of mammalian paraoxonase/arylesterase is unknown. However paraoxonase is an HDL-associated protein, and recent studies indicate that it may have anti-atherogenic functions. We describe the chromosomal localization and structure of the mouse paraoxonase gene (Pon1) to establish Pon1 as a candidate gene for genetically determined traits or pathological states in the mouse. The coding portion of Pon1 extends over approximately 25-26 kb and consists of nine exons and eight introns. We also present nucleotide sequences from the 5{prime}-flanking region of Pon1 containing numerous consensus sequences for DNA binding proteins. Haplotype analysis of 94 N2 progeny from an interspecific cross indicates that Pon1 is localized on proximal mouse chromosome 6 near D6Mit86. This assignment excludes Pon1 as a candidate for the atherosclerosis susceptibility genes Ath1, Ath2, and Ath3. However, Pon1 is a promising candidate for the remaining unmapped Ath genes. 29 refs., 3 figs., 2 tabs.

Sorenson, R.C.; Primo-Parmo, S.L.; La Du, B.N. [Univ of Michigan Medical School, Ann Arbor, MI (United States)] [and others

1995-12-10

384

Cloning and sequencing of the mouse Gli2 gene: Localization to the Dominant hemimelia critical region  

SciTech Connect

The GLI family of zinc finger genes has been implicated in both neoplastic and developmental disorders. We have cloned and sequenced the mouse homolog of the zinc finger gene Gli2 and demonstrated significant similarity to the human GLI3 gene. We have also localized Gli2 to mouse chromosome 1, in the vicinity of the morphogenetic mutation Dominant hemimelia (Dh), which is characterized by tibial hemimelia, poly/oligodactyly, and a number of visceral abnormalities, most strikingly absence of the spleen. Using a Gli2-associated microsatellite, we demonstrated no recombination between Dh and Gli2 in a Dh intraspecific backcross. Gli2 is expressed in Dh heterozygotes and homozygotes. However, using a combination of mismatch analysis and direct sequencing, we have failed to identify any mutations in the coding sequence of Gli2 from Dh. We have also demonstrated that it is unlikely that there are any Gli genes in the mouse genome in addition to the previously described Gli, Gli2, and Gli3. 52 refs., 4 figs., 4 tabs.

Hughes, D.C. [Western General Hospital, Edinburgh (United Kingdom)]|[Univ. of Nottingham (United Kingdom); Allen, J.; Prosser, J. [Western General Hospital, Edinburgh (United Kingdom)] [and others

1997-01-15

385

Gene structure and chromosomal localization of mouse cyclin G2 (Ccng2).  

PubMed

Cyclins are essential activators of cyclin-dependent kinases (Cdk) which, in turn, play pivotal roles in controlling transition through cell-cycle checkpoints. Cyclin G2 is a recently discovered second member of the G-type cyclins. The two members of the G-type cyclins, cyclin G1 and cyclin G2, share high structural similarity but their function remains to be defined. Here we characterize the structure of the mouse cyclin G2 gene by first cloning and sequencing the full-length mouse cyclin G2 cDNA. The cyclin G2 cDNA was used to isolate the cyclin G2 gene from a BAC library and to establish that the gene was transcribed from eight exons spanning a total of 8604bp. The cyclin G2 gene was mapped by fluorescence in situ hybridization (FISH) to mouse chromosome 5E3.3.-F1.3. This region is syntenic to a region on human chromosome 4. The expression of cyclins G1 and G2 was examined in various tissues, but no correlation between expression patterns of the two genes was observed. However, during hepatic ontogenesis the cyclin G2 expression level decreased with age, whereas cyclin G1 expression increased. Transient expression of cyclin G2-green fluorescent protein (GFP) fusion protein in NIH3T3 cells showed that cyclin G2 is essentially a cytoplasmic protein, in contrast to the largely nuclear localization of cyclin G1. Our data suggest that, despite the close structural similarity between mouse cyclins G1 and G2, these proteins most likely perform distinct functions. PMID:10216255

Jensen, M R; Audolfsson, T; Keck, C L; Zimonjic, D B; Thorgeirsson, S S

1999-04-16

386

Regulation of Mouse k Opioid Receptor Gene Expression by Retinoids  

Microsoft Academic Search

The effect of retinoids on the expression of k opioid receptor (KOR) gene was examined in normal and transgenic animals. KOR-lacZ transgene expression was specifically elevated in KOR-positive areas of the developing CNS by depleting vitamin A from animal diets. The endogenous KOR mRNA species, including all three isoforms, were also upregulated by depleting vitamin A in developing animals. Change

Jing Bi; Xinli Hu; Horace H. Loh; Li-Na Wei

2001-01-01

387

Gene structure of human and mouse methylenetetrahydrofolate reductase (MTHFR)  

Microsoft Academic Search

.   Methylenetetrahydrofolate reductase (MTHFR) catalyzes the conversion of 5,10-methylenetetrahydrofolate to 5-methyltetrahydrofolate,\\u000a a co-substrate for homocysteine remethylation to methionine. A human cDNA for MTHFR, 2.2 kb in length, has been expressed\\u000a and shown to result in a catalytically active enzyme of approximately 70 kDa. Fifteen mutations have been identified in the\\u000a MTHFR gene: 14 rare mutations associated with severe enzymatic deficiency

Philippe Goyette; Aditya Pai; Renate Milos; Phyllis Frosst; Pamela Tran; Zhoutao Chen; Manuel Chan; Rima Rozen

1998-01-01

388

Deletion of the Mouse P450c17 Gene Causes Early Embryonic Lethality  

PubMed Central

Dehydroepiandrosterone (DHEA), a 19-carbon precursor of sex steroids, is abundantly produced in the human but not the mouse adrenal. However, mice produce DHEA and DHEA-sulfate (DHEAS) in the fetal brain. DHEA stimulates axonal growth from specific populations of mouse neocortical neurons in vitro, while DHEAS stimulates dendritic growth from those cells. The synthesis of DHEA and sex steroids, but not mouse glucocorticoids and mineralocorticoids, requires P450c17, which catalyzes both 17?-hydroxylase and 17,20-lyase activities. We hypothesized that P450c17-knockout mice would have disordered sex steroid synthesis and disordered brain DHEA production and thus provide phenotypic clues about the functions of DHEA in mouse brain development. We deleted the mouse P450c17 gene in 127/SvJ mice and obtained several lines of mice from two lines of targeted embryonic stem cells. Heterozygotes were phenotypically and reproductively normal, but in all mouse lines, P450c17?/? zygotes died by embryonic day 7, prior to gastrulation. The cause of this early lethality is unknown, as there is no known function of fetal steroids at embryonic day 7. Immunocytochemistry identified P450c17 in embryonic endoderm in E7 wild-type and heterozygous embryos, but its function in these cells is unknown. Enzyme assays of wild-type embryos showed a rapid rise in 17-hydroxylase activity between E6 and E7 and the presence of C17,20-lyase activity at E7. Treatment of pregnant females with subcutaneous pellets releasing DHEA or 17-OH pregnenolone at a constant rate failed to rescue P450c17?/? fetuses. Treatment of normal pregnant females with pellets releasing pregnenolone or progesterone did not cause fetal demise. These data suggest that steroid products of P450c17 have heretofore-unknown essential functions in early embryonic mouse development.

Bair, Susanna R.; Mellon, Synthia H.

2004-01-01

389

Vascular defects and liver damage by the acute inactivation of the VHL gene during mouse embryogenesis.  

PubMed

Inactivation of the von Hippel-Lindau (VHL) tumor suppressor gene leads to the development of central nervous system hemangioblastomas, pheochromocytomas and renal cell carcinomas. The biological role of the VHL gene during development is poorly understood because of early lethality of VHL-null embryos. To overcome early embryo lethality observed in the conventional knockout mouse, we introduced a tamoxifen-inducible Cre (CreER(TM)) transgene for the stage specific inactivation of the VHL gene. Acute tamoxifen-induced inactivation of the VHL gene at E10.5 resulted in embryonic lethality between E14.5 and E15.0 with extensive hemorrhage and necrosis, while littermate controls showed normal development. Examination of the VHL-inactivated embryos between E10.5 and E14.5 revealed dilated blood vessels, hemorrhage and necrotizing liver damage. Concomitant with severe hemorrhage and abnormal vasculature at E15.0, blood circulation in the yolk sac was impaired in the VHL-inactivated embryos, which may be the cause of embryo death. Placental development looked normal before embryo death (E14.5); however, at E16.5 following embryo death, we observed reduced growth of the placental labyrinthine layer. Inactivation of the VHL gene resulted in hypoxia-inducible factor (HIF)-1alpha stabilization and induction of its target genes, VEGF and CAIX, in mouse embryonic fibroblasts (MEFs). In addition, we observed lactate overproduction and acidification of culture media by the inactivation of the VHL gene. Thus, by using a novel conditional VHL knockout mouse model, we could show that the VHL gene plays an important role in the developing vasculature and liver during embryogenesis through regulation of HIF-1alpha and its target genes. This mouse model will be useful for the screening of anti-HIF or anti-VEGF drugs in vivo. Additionally, this acute VHL inactivation system may provide a useful tool for the in vivo study of genes that cause early embryonic lethality. PMID:16652107

Hong, Seung-Beom; Furihata, Mutsuo; Baba, Masaya; Zbar, Berton; Schmidt, Laura S

2006-05-01

390

Mouse in Utero Electroporation: Controlled Spatiotemporal Gene Transfection  

PubMed Central

In order to understand the function of genes expressed in specific region of the developing brain, including signaling molecules and axon guidance molecules, local gene transfer or knock- out is required. Gene targeting knock-in or knock-out into local regions is possible to perform with combination with a specific CRE line, which is laborious, costly, and time consuming. Therefore, a simple transfection method, an in utero electroporation technique, which can be performed with short time, will be handy to test the possible function of candidate genes prior to the generation of transgenic animals 1,2. In addition to this, in utero electroporation targets areas of the brain where no specific CRE line exists, and will limit embryonic lethality 3,4. Here, we present a method of in utero electroporation combining two different types of electrodes for simple and convenient gene transfer into target areas of the developing brain. First, a unique holding method of embryos using an optic fiber optic light cable will make small embryos (from E9.5) visible for targeted DNA solution injection into ventricles and needle type electrodes insertion to the targeted brain area 5,6. The patterning of the brain such as cortical area occur at early embryonic stage, therefore, these early electroporation from E9.5 make a big contribution to understand entire area patterning event. Second, the precise shape of a capillary prevents uterine damage by making holes by insertion of the capillary. Furthermore, the precise shape of the needle electrodes are created with tungsten and platinum wire and sharpened using sand paper and insulated with nail polish 7, a method which is described in great detail in this protocol. This unique technique allows transfection of plasmid DNA into restricted areas of the brain and will enable small embryos to be electroporated. This will help to, open a new window for many scientists who are working on cell differentiation, cell migration, axon guidance in very early embryonic stage. Moreover, this technique will allow scientists to transfect plasmid DNA into deep parts of the developing brain such as thalamus and hypothalamus, where not many region-specific CRE lines exist for gain of function (GOF) or loss of function (LOF) analyses.

Matsui, Asuka; Yoshida, Aya C.; Kubota, Mayumi; Ogawa, Masaharu; Shimogori, Tomomi

2011-01-01

391

Gene order is conserved within the human chromosome 21 linkage group on mouse chromosome 10  

SciTech Connect

One hundred progeny from each of two intersubspecific mouse backcrosses were used to construct a comparative genetic map of a region of mouse chromosome 10 (MMU10) that is homologous to the distal tip of the long arm of human chromosome 21 (HSA21). The analysis included five genes and three simple sequence repeat markers, two of which flanked the HSA21-homologous cluster on either side. Analysis of 200 backcross progeny detected at least one crossover between each pair of adjacent genes and demonstrated that the proximal to distal orientation of the cluster was reversed between human and mouse. The order was determined to be Fyn-1-D10Mit20-S100b-Col6a1-Itgb2-Pfk1/D10Mit7-D10Mit11. Comparative mapping supports the order of corresponding markers on HSA21 determined using pulsed-field gel electrophoresis and radiation hybrid line data. However, sequence tagged site content mapping of human yeast artificial chromosomes (YACs) yielded conflicting data on the relative positions of human COL6A1 and S100B on HSA21. This discrepancy was resolved here by demonstrating that several key YACs used in the human contig analysis were mistyped for S100B. The murine map reported here provides a scaffold for construction of physical maps and yeast artificial chromosome contigs that will be useful in the development of mouse models for the study of Down syndrome. 28 refs., 4 figs., 2 tabs.

Irving, N.G.; Cabin, D.E.; Swanson, D.A.; Reeves, R.H. (Johns Hopkins Univ. School of Medicine, Baltimore, MD (United States))

1994-05-01

392

Characterization of the oncogenic activity of the novel TRIM59 gene in mouse cancer models.  

PubMed

A novel TRIM family member, TRIM59 gene was characterized to be upregulated in SV40 Tag oncogene-directed transgenic and knockout mouse prostate cancer models as a signaling pathway effector. We identified two phosphorylated forms of TRIM59 (p53 and p55) and characterized them using purified TRIM59 proteins from mouse prostate cancer models at different stages with wild-type mice and NIH3T3 cells as controls. p53/p55-TRIM59 proteins possibly represent Ser/Thr and Tyr phosphorylation modifications, respectively. Quantitative measurements by ELISA showed that the p-Ser/Thr TRIM59 correlated with tumorigenesis, whereas the p-Tyr-TRIM59 protein correlated with advanced cancer of the prostate (CaP). The function of TRIM59 was elucidated using short hairpin RNA (shRNA)-mediated knockdown of the gene in human CaP cells, which caused S-phase cell-cycle arrest and cell growth retardation. A hit-and-run effect of TRIM59 shRNA knockdown was observed 24 hours posttransfection. Differential cDNA microarrray analysis was conducted, which showed that the initial and rapid knockdown occurred early in the Ras signaling pathway. To confirm the proto-oncogenic function of TRIM59 in the Ras signaling pathway, we generated a transgenic mouse model using a prostate tissue-specific gene (PSP94) to direct the upregulation of the TRIM59 gene. Restricted TRIM59 gene upregulation in the prostate revealed the full potential for inducing tumorigenesis, similar to the expression of SV40 Tag, and coincided with the upregulation of genes specific to the Ras signaling pathway and bridging genes for SV40 Tag-mediated oncogenesis. The finding of a possible novel oncogene in animal models will implicate a novel strategy for diagnosis, prognosis, and therapy for cancer. PMID:21593385

Valiyeva, Fatma; Jiang, Fei; Elmaadawi, Ahmed; Moussa, Madeleine; Yee, Siu-Pok; Raptis, Leda; Izawa, Jonathan I; Yang, Burton B; Greenberg, Norman M; Wang, Fen; Xuan, Jim W

2011-05-18

393

Genetics and polymorphism of the mouse prion gene complex: control of scrapie incubation time.  

PubMed Central

The mouse prion protein (PrP) gene (Prn-p), which encodes the only macromolecule that has been identified in scrapie prions, is tightly linked or identical to a gene (Prn-i) that controls the duration of the scrapie incubation period in mice. Constellations of restriction fragment length polymorphisms distinguish haplotypes a to f of Prn-p. The Prn-pb allele encodes a PrP that differs in sequence from those encoded by the other haplotypes and, in inbred mouse strains, correlates with long scrapie incubation time (Westaway et al., Cell 51: 651-662, 1987). In segregating crosses of mice, we identified rare individuals with a divergent scrapie incubation time phenotype and Prn-p genotype, but progeny testing to demonstrate meiotic recombination was not possible because scrapie is a lethal disease. Crosses involving the a, d, and e haplotypes demonstrated that genes unlinked to Prn-p could modulate scrapie incubation time and that there were only two alleles of Prn-i among the mouse strains tested. All inbred strains of mice that had the Prnb haplotype were probably direct descendants of the I/LnJ progenitors. We established the linkage relationship between the prion gene complex (Prn) and other chromosome 2 genes; the gene order, proximal to distal, is B2m-II-1a-Prn-Itp-A. Recombination suppression in the B2m-Prn-p interval occurred during the crosses involved in transferring the I/LnJ Prnb complex into a C57BL/6J background. Transmission ratio distortion by Prna/Prnb heterozygous males was also observed in the same crosses. These phenomena, together with the founder effect, would favor apparent linkage disequilibrium between Prn-p and Prn-i. Therefore, transmission genetics may underestimate the number of genes in Prn. Images

Carlson, G A; Goodman, P A; Lovett, M; Taylor, B A; Marshall, S T; Peterson-Torchia, M; Westaway, D; Prusiner, S B

1988-01-01

394

Expression of tyrosine kinase gene in mouse thymic stromal cells.  

PubMed

Amongst the most important signal transduction molecules involved in regulating growth and differentiation are the protein tyrosine kinases (PTK). Since T cell development is a consequence of interactions between thymic stromal cells (TSC) and thymocytes, identification of the PTK in both compartments is required to dissect the mechanisms that control this process. Here we report a search for PTK in mouse TSC, using RT-PCR to survey the repertoire of PTK mRNAs expressed in a freshly isolated TSC preparation. We identified 10 different PTK cDNAs among the 216 cDNAs sequenced, and demonstrate that transcripts of three of those (ufo, fyn and fer) are widely expressed among a large panel of immortalized thymic epithelial cell lines (TEC) and in primary cultures of TSC. Of the other seven, none were expressed in established TEC lines but, instead, displayed distinct expression patterns in cell types likely to have contaminated the fresh TSC preparation, i.e., macrophages, B cells, T cells and fibroblasts. Among the three PTK expressed in TEC lines, only one, ufo, exhibited expression exclusively in cells of non-hemopoietic origin. Although expression of ufo (also known as tyro 7, axl or ark) is not thymic-specific, in that it is also expressed in cell types of mesodermal origin in other tissues, its presence in TEC suggests a role for ufo in differentiation of the TSC compartment. Consistent with this notion, high-level expression of this receptor PTK at the protein level could be documented in every TEC line investigated, as well as in fresh thymus tissue sections. These data provide the first example of a receptor PTK in TSC and open new approaches to study the regulation of TSC differentiation. PMID:8943574

Rinke de Wit, T F; Izon, D J; Revilla, C; Oosterwegel, M; Bakker, A Q; van Ewijk, W; Kruisbeek, A M

1996-11-01

395

Adeno-associated virus-mediated gene delivery into the scala media of the normal and deafened adult mouse ear  

Microsoft Academic Search

Murine models are ideal for studying cochlear gene transfer, as many hearing loss-related mutations have been discovered and mapped within the mouse genome. However, because of the small size and delicate nature, the membranous labyrinth of the mouse is a challenging target for the delivery of viral vectors. To minimize injection trauma, we developed a procedure for the controlled release

L A Kilpatrick; Q Li; J Yang; J C Goddard; D M Fekete; H Lang

2011-01-01

396

Identification of three mouse ?-opioid receptor (MOR) gene ( Oprm1) splice variants containing a newly identified alternatively spliced exon  

Microsoft Academic Search

The mouse ?-opioid receptor gene, Oprm1, is recognized currently to contain 17 alternatively spliced exons that generate 24 splice variants encoding at least 11 morphine-binding isoforms of the receptor. Here, we identify three new MOR splice variants that contain a previously undescribed exon, exon 18, and provide evidence that they are expressed in two mouse strains. The transcripts containing the

Glenn A. Doyle; X. Rebecca Sheng; Sharon S. J. Lin; Dorothy E. Grice; Russell J. Buono; Thomas N. Ferraro; Wade H. Berrettini

2007-01-01

397

Homologs of genes expressed in Caenorhabditis elegans GABAergic neurons are also found in the developing mouse forebrain  

Microsoft Academic Search

BACKGROUND: In an effort to identify genes that specify the mammalian forebrain, we used a comparative approach to identify mouse homologs of transcription factors expressed in developing Caenorhabditis elegans GABAergic neurons. A cell-specific microarray profiling study revealed a set of transcription factors that are highly expressed in embryonic C. elegans GABAergic neurons. RESULTS: Bioinformatic analyses identified mouse protein homologs of

Elizabeth AD Hammock; Kathie L Eagleson; Susan Barlow; Laurie R Earls; David M Miller; Pat Levitt

2010-01-01