Lung epithelial cell ATAC G9ai
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE231366 | GEO | 2023/10/05
REPOSITORIES: GEO
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Project description:We profiled chromatin accessibility across the genome of HSPCs treated with either a small molecule inhibitor of G9a/GLP or DMSO. We observed that chromatin accessibility is dramatically altered at the regions of H3K9me2 nucleation. We have characterized the regions of H3K9me2 nucleation, revealing that H3K9me2 is nucleated in HSPCs at CpG islands (CGIs) and CGI-like sequences across the genome. Our analysis furthermore revealed a bias of H3K9me2 nucleation towards regions with low rates of C->T deamination, which typically lack DNA methylation. Lastly we examined the interaction of H3K9me2 and DNA methylation and determined that chromatin accessibility changes upon loss of H3K9me2 are dependent on the presence of DNA methylation. Examination of chromatin remodeling with FAIRE-seq in HSPCs treated with either a small molecule inhibitor of G9a/GLP or DMSO
2014-09-25 | E-GEOD-59749 | biostudies-arrayexpress
Project description:Histone H3 lysine 9 dimethylation (H3K9me2) is a highly conserved silencing epigenetic mark. Chromatin marked with H3K9me2 forms large domains in mammalian cells and overlaps well with lamina-associated domains and the B compartment defined by Hi-C. However, the role of H3K9me2 in 3-dimensional (3D) genome organization remains unclear. We investigated genome-wide H3K9me2 distribution, transcriptome, and 3D genome organization in mouse embryonic stem cells following the inhibition or depletion of five H3K9 methyltransferases (MTases): G9a, GLP, SETDB1, SUV39H1, and SUV39H2. H3K9me2 was regulated by all five MTases; however, H3K9me2 and transcription in the A and B compartments were regulated by different MTases. H3K9me2 in A compartments was primarily regulated by G9a/GLP and SETDB1, while H3K9me2 in the B compartments was regulated by all five MTases. Furthermore, decreased H3K9me2 correlated with changes to the more active compartmental state that accompanied transcriptional activation.
2021-08-05 | PXD024756 | Pride
Project description:G9a (EHMT2) and the G9a-like protein GLP (EHMT1) form a stable G9a/GLP heterodimer in embryonic stem cells and function cooperatively to establish and maintain the abundant repressive H3K9me2 modification, in addition to modifying several non-histone proteins. The G9a-dependent H3K9me2 is implicated in lineage-specific gene silencing and covers large chromosomal domains. While the mechanism of H3K9me2maintenance by G9a/GLP is known, how new patterns of this modification are established is not well understood. With this in mind, we used FLAG affinity purification of G9a under two different stringency conditions (150 and 300 mM NaCl) coupled with mass spectrometry to identify proteins stably associated with G9a/GLP, which could serve as potential recruiters of the complex to unmodified chromatin.
2016-03-16 | PXD003466 | Pride
Project description:We profiled chromatin accessibility across the genome of HSPCs treated with either a small molecule inhibitor of G9a/GLP or DMSO. We observed that chromatin accessibility is dramatically altered at the regions of H3K9me2 nucleation. We have characterized the regions of H3K9me2 nucleation, revealing that H3K9me2 is nucleated in HSPCs at CpG islands (CGIs) and CGI-like sequences across the genome. Our analysis furthermore revealed a bias of H3K9me2 nucleation towards regions with low rates of C->T deamination, which typically lack DNA methylation. Lastly we examined the interaction of H3K9me2 and DNA methylation and determined that chromatin accessibility changes upon loss of H3K9me2 are dependent on the presence of DNA methylation.
2014-09-25 | GSE59749 | GEO
Project description:Phosphorylation of Ser10 of histone H3 (H3S10p), together with the adjacent dimethylation of Lys9 (H3K9me2), has been proposed to function as a ‘phospho-methyl switch’ to regulate mitotic chromosome dynamics and control peripheral heterochromatin localization (1, 2). Despite of immensely understanding the regulation of H3S10 phosphorylation, how this modification temporarily masks the H3K9me2 mark during mitosis is poorly understood. Herein, we report that the master mitotic kinase Plk1 phosphorylates G9a at Thr1045 (pT1045) in vitro and in vivo at early mitosis. T1045p inhibits G9a catalytic activity, leading to decrease H3K9me2 levels. RNA-sequencing analysis showed that the phospho-mimic T1045 mutant of G9a (T1045E) compromised its repressive activity on several targeted genes, which was confirmed by luciferase reporter assays. Using genome-wide epigenomic technologies, we found that T1045E mutant displayed reduced H3K9me2 level, accompanied with increased chromatin accessibility, compared to the wild-type G9a cells. Finally, we found that T1045 phosphorylation could be removed by the phosphatase PP2A at late mitosis, which inversely reactivated G9a activity on H3K9me2 level, correlated with lower levels of H3S10p. Therefore, our result may provide a mechanistic explanation for ‘phospho-methyl switch’ and highlight the importance of Plk1 and PP2A-mediated dynamic regulation of G9a during mitosis.
2023-07-17 | GSE223359 | GEO
Project description:Histone H3 lysine 9 dimethylation (H3K9me2) is a highly conserved silencing epigenetic mark. Chromatin marked with H3K9me2 forms large domains in mammalian cells and overlaps well with lamina-associated domains and the B compartment defined by Hi-C. However, the role of H3K9me2 in 3-dimensional (3D) genome organization remains unclear. We investigated genome-wide H3K9me2 distribution, transcriptome, and 3D genome organization in mouse embryonic stem cells following the inhibition or depletion of five H3K9 methyltransferases (MTases): G9a, GLP, SETDB1, SUV39H1, and SUV39H2. H3K9me2 was regulated by all five MTases; however, H3K9me2 and transcription in the A and B compartments were regulated by different MTases. H3K9me2 in A compartments was primarily regulated by G9a/GLP and SETDB1, while H3K9me2 in the B compartments was regulated by all five MTases. Furthermore, decreased H3K9me2 correlated with changes to the more active compartmental state that accompanied transcriptional activation.
2021-03-18 | GSE169103 | GEO
Project description:Histone H3 lysine 9 dimethylation (H3K9me2) is a highly conserved silencing epigenetic mark. Chromatin marked with H3K9me2 forms large domains in mammalian cells and overlaps well with lamina-associated domains and the B compartment defined by Hi-C. However, the role of H3K9me2 in 3-dimensional (3D) genome organization remains unclear. We investigated genome-wide H3K9me2 distribution, transcriptome, and 3D genome organization in mouse embryonic stem cells following the inhibition or depletion of five H3K9 methyltransferases (MTases): G9a, GLP, SETDB1, SUV39H1, and SUV39H2. H3K9me2 was regulated by all five MTases; however, H3K9me2 and transcription in the A and B compartments were regulated by different MTases. H3K9me2 in A compartments was primarily regulated by G9a/GLP and SETDB1, while H3K9me2 in the B compartments was regulated by all five MTases. Furthermore, decreased H3K9me2 correlated with changes to the more active compartmental state that accompanied transcriptional activation.
2021-03-18 | GSE169099 | GEO
Project description:Histone H3 lysine 9 dimethylation (H3K9me2) is a highly conserved silencing epigenetic mark. Chromatin marked with H3K9me2 forms large domains in mammalian cells and overlaps well with lamina-associated domains and the B compartment defined by Hi-C. However, the role of H3K9me2 in 3-dimensional (3D) genome organization remains unclear. We investigated genome-wide H3K9me2 distribution, transcriptome, and 3D genome organization in mouse embryonic stem cells following the inhibition or depletion of five H3K9 methyltransferases (MTases): G9a, GLP, SETDB1, SUV39H1, and SUV39H2. H3K9me2 was regulated by all five MTases; however, H3K9me2 and transcription in the A and B compartments were regulated by different MTases. H3K9me2 in A compartments was primarily regulated by G9a/GLP and SETDB1, while H3K9me2 in the B compartments was regulated by all five MTases. Furthermore, decreased H3K9me2 correlated with changes to the more active compartmental state that accompanied transcriptional activation.
2021-03-18 | GSE169098 | GEO
Project description:Purpose: to demonstrate that G9a maintain CCICs functional triats is independent of its methyltransferase activity. Method: ChIP-seq was applied to CCICs to elucidate the nature of G9a and H3K9me2-regulated differential gene targets by Illumina/Soleza Genome analyzer Results: It was shown that ghe 4,902 G9a-and H3K9me2-targeted genes are broadly idstributed throughout the genome, and both are co-localized at most of the sites in CCICs. G9a and H3K9me2-targeted in CCICs
2016-08-10 | E-GEOD-82131 | biostudies-arrayexpress
Project description:G9a is able to silence gene expression in hypoxic condition by increasing histone H3K9me2. We have identified a set of genes that are negatively regulated by G9a in hypoxia-dependent manner. In this dataset, we include the expression data obtained from MCF7 breast epithelial cells that have been transfected with control (WT) or G9a shRNAs (KD) and exposed to either normoxia or hypoxia. These data are used to obtain 829 genes that are differentially expressed in response to hypoxia, and 205 genes that are sentisive to G9a level. 4 samples were analysed. We generated comparisons between WT and KD in normoxic as well as hypoxic condition. Genes differentially expressed in hypoxic condition were selected followed by selection of genes that lose this differential expression upon G9a knockdown.
2015-12-31 | E-GEOD-59449 | biostudies-arrayexpress