Lineage selective cardiac GATA4 chromatin occupancy [embryo]
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA656292 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR12424703.fastq.gz | Fastqsanger.gz | |||
| SRR12424704.fastq.gz | Fastqsanger.gz | |||
| SRR12424705.fastq.gz | Fastqsanger.gz | |||
| SRR12424706.fastq.gz | Fastqsanger.gz | |||
| SRR12424707.fastq.gz | Fastqsanger.gz |
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Project description:GATA4 occupancy on the mouse genome of satellite cell-derived primary myoblasts. Proliferating myoblasts cultured in growth medium were immunoprecipitated with anti-GATA4 antibody or control IgG. Precipitated genomic DNAs were subjected to next generation sequencing.
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Project description:GATA4 regulates the liver development, but it's function and the gene transcriptional programs it regulates in the adult liver is unknown. In this study, we determined the genome-wide occupancy sites of GATA4 by performing ChIP-seq of whole livers. We have identified 4409 GATA4 enrichment peaks using two peak calling methods and irreproducible discovery rate (IDR) analysis. This corresponds to 3075 genes with GATA4 peaks within -5 kb of transcription start site (TSS) and +5 kb of transcription termination site (TTS). MEME analysis shows that approximately 90% of the peaks have the WGATAR motif, suggesting direct binding by GATA4. The peaks containing the WGATAR motif have a ChIP-seq higher tag enrichment score than peaks lacking the motif. Genome Regions Enrichment of Annotations Tool (GREAT) analysis of genes bound by GATA4 identified ontologies with liver specific functions. In summary, our study shows for the first time genome-wide occupancy profile of GATA4in the adult mouse liver. ChIP-sequencing of whole mouse livers from 2-3 month old mice
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Project description:Cardiac hypertrophy is regulated by the zinc finger-containing DNA binding factors Gata4 and Gata6, both of which are required to mount a productive growth response of the adult heart. To determine if Gata4 and Gata6 are redundant or have non-overlapping roles, we performed cardiomyocyte-specific conditional gene deletions for Gata4 and Gata6 in conjunction with reciprocal replacement with a transgene encoding either Gata4 or Gata6, during the pressure overload response. We determined that Gata4 and Gata6 play a redundant and dosage-sensitive role in programming the hypertrophic growth response itself following pressure overload stimulation. However, non-redundant functions were identified as functional decompensation induced by either Gata4 or Gata6 deletion was not rescued by the reciprocal transgene, and only Gata4 heart-specific deletion produced a reduction in capillary density after pressure overload. Gene expression profiling from hearts of these gene-deleted mice showed both overlapping and unique transcriptional codes, with Gata4 exhibiting the strongest impact. These results indicate that Gata4 and Gata6 play a dosage-dependent and semi-redundant role in programming cardiac hypertrophy, but that each has a unique role in maintaining cardiac homeostasis and adaptation to injury that cannot be compensated by the other. Microarray-bassed gene expression profiling identified overlapping, distinct, and quantitatively/differentially regulated classes of Gata4 or Gata6 regulated genes. To determine if Gata4 and Gata6 are redundant or have non-overlapping roles in programming cardiac hypertrophic responses and adaptation to stress or injury, we performed cardiomyocyte-specific conditional gene deletions for Gata4 and Gata6 in conjunction with reciprocal replacement with a transgene encoding either Gata4 or Gata6, during the pressure overload response.
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Project description:GATA4 regulates the liver development, but it's function and the gene transcriptional programs it regulates in the adult liver is unknown. In this study, we determined the genome-wide occupancy sites of GATA4 by performing ChIP-seq of whole livers. We have identified 4409 GATA4 enrichment peaks using two peak calling methods and irreproducible discovery rate (IDR) analysis. This corresponds to 3075 genes with GATA4 peaks within -5 kb of transcription start site (TSS) and +5 kb of transcription termination site (TTS). MEME analysis shows that approximately 90% of the peaks have the WGATAR motif, suggesting direct binding by GATA4. The peaks containing the WGATAR motif have a ChIP-seq higher tag enrichment score than peaks lacking the motif. Genome Regions Enrichment of Annotations Tool (GREAT) analysis of genes bound by GATA4 identified ontologies with liver specific functions. In summary, our study shows for the first time genome-wide occupancy profile of GATA4in the adult mouse liver.
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2015-05-16 | E-GEOD-68957 | biostudies-arrayexpress
Project description:GATA4 is a transcription factor known for its crucial role in the development of many tissues, including liver; however, its role in adult liver metabolism is unknown. Here, using high-throughput sequencing technologies, including assay for transposase-accessible chromatin with sequencing (ATAC-Seq), we identified GATA4 as a transcriptional regulator of metabolism in liver. GATA4 expression is elevated in response to refeeding, and its occupancy is increased at enhancers of genes linked to fatty acid and lipoprotein metabolism. Knocking out GATA4 in adult liver (Gata4LKO) decreased transcriptional activity at GATA4 binding sites especially during feeding. Gata4LKO mice have reduced plasma HDL cholesterol and increased liver triglyceride levels. The expression of a panel of genes involved in cholesterol export and triglyceride hydrolysis was downregulated and the expression of those involved in lipid uptake were upregulated in Gata4LKO liver, We further demonstrate that GATA4 collaborates with LXR liver. GATA4 shares a number of binding sites and direct transcriptional targets with LXRs, and loss of GATA4 impairs the hepatic transcriptional response to LXR agonist. Collectively, these results show that hepatic GATA4 contributes to the transcriptional control of hepatic and systemic lipid homeostasis.
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Project description:GATA4 is expressed in the proximal 85% of small intestine where it promotes a proximal intestinal ('jejunal') identity while repressing a distal intestinal ('ileal') identity, but its molecular mechanisms are unclear. Here, we tested the hypothesis that GATA4 promotes a jejunal versus ileal identity in mouse intestine by directly activating and repressing specific subsets of absorptive enterocyte genes by modulating the acetylation of histone H3, lysine 27 (H3K27), a mark of active chromatin, at sites of GATA4 occupancy. Global analysis of mouse jejunal epithelium showed a statistically significant association of GATA4 occupancy with GATA4-regulated genes. Occupancy was equally distributed between down- and up-regulated targets, and occupancy sites showed a dichotomy of unique motif over-representation at down- versus up-regulated genes. H3K27ac enrichment at GATA4-binding loci that mapped to down-regulated genes (activation targets) was elevated, changed little upon conditional Gata4 deletion, and was similar to control ileum, whereas H3K27ac enrichment at GATA4-binding loci that mapped to up-regulated genes (repression targets) was depleted, increased upon conditional Gata4 deletion, and approached H3K27ac enrichment in wild-type control ileum. These data support the hypothesis that GATA4 both activates and represses intestinal genes, and show that GATA4 represses an ileal program of gene expression in the proximal small intestine by inhibiting the acetylation of H3K27.
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Project description:DNA methylation changes dynamically during development and is essential for embryogenesis in mammals. However, how DNA methylation affects developmental gene expression and cell differentiation remains elusive. During embryogenesis, many key transcription factors are used repeatedly, triggering different outcomes depending on the cell type and developmental stage. Here, we report that DNA methylation modulates transcription-factor output in the context of cell differentiation. Using a drug-inducible Gata4 system and a mouse embryonic stem (ES) cell model of mesoderm differentiation, we examined the cellular response to Gata4 in ES and mesoderm cells. The activation of Gata4 in ES cells is known to drive their differentiation to endoderm. We show that the differentiation of wild-type ES cells into mesoderm blocks their Gata4-induced endoderm differentiation, while mesoderm cells derived from ES cells that are deficient in the DNA methyltransferases Dnmt3a and Dnmt3b can retain their response to Gata4, allowing lineage conversion from mesoderm cells to endoderm in part. Transcriptome analysis of the cells' response to Gata4 over time revealed groups of endoderm and mesoderm developmental genes whose expression was induced by Gata4 only when DNA methylation was lost, suggesting that DNA methylation restricts the ability of these genes to respond to Gata4, rather than controlling their transcription per se. Our data indicate that epigenetic regulation by DNA methylation functions as a heritable safeguard to prevent transcription factors from activating inappropriate downstream genes, thereby contributing to the restriction of the differentiation potential of somatic cells. To understand how mouse cells differentially respond to Gata4 in cell type- and DNA methylation-dependent manners and to examine what genes are differentially regulated, we analyzed temporal change of gene expression profile in response to Gata4 in ES or Flk1(+) mesoderm cells in WT and Dnmt3a-/-Dnmt3b-/- (DKO) background, in total 108 samples.
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