EZH2 inhibition with GSK343 reduces H3K27me3 deposition at various repetitive elements in splenic B cells [ChIP-Seq]
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE198158 | GEO | 2023/10/18
REPOSITORIES: GEO
Similar Datasets
Project description:EZH2 is a histone methyltransferase that deposits the repressive histone H3 lysine 27 trimethylation (H3K27me3). This mark has been reported to silence expression of various repetitive elements in the genome. We sought to identify the effect of EZH2 inhibition on coding and non-coding, repetitive RNA expression. We generated a novel mutant mouse line whose ability to detect induced repeat element expression has been abrogated. We report that the mutant splenic B cells fail to upregulate inflammatory gene expression upon EZH2 inhibition, despite comparable upregulation of various repetitive elements with WT.
2023-10-18 | GSE198159 | GEO
Project description:EZH2 is a histone methyltransferase that deposits the repressive histone H3 lysine 27 trimethylation (H3K27me3). This mark has been reported to silence expression of various repetitive elements in the genome. We sought to identify the effect of EZH2 inhibition on coding and non-coding, repetitive RNA expression. We generated a novel mutant mouse line whose ability to detect induced repeat element expression has been abrogated. We report that the mutant splenic B cells fail to upregulate inflammatory gene expression upon EZH2 inhibition, despite comparable upregulation of various repetitive elements with WT. Unlike WT splenic B cells that do not upregulate interferon gene expression upon EZH2 inhibition, B16-F10 melanoma cells activate their expression under the same inhibitor treatment. Cytosolic pattern recognition receptors, RIG-I and Cgas, are required for such response as their deletion abrogates this pathway.
2023-10-18 | GSE239879 | GEO
Project description:EZH2 is a histone methyltransferase that deposits H3K27me2/3 in heterochromatin and it is misregulated in tumorigenesis. Inhibition of heterochromatin can induce viral mimicry in cancer cells, where upregulated repetitive elements are detected by cytosolic pattern recognition receptors (PRRs) to activate inflammatory signaling. Here we demonstrate that EZH2 inhibitors stimulate inflammation and immune self-recognition of resting splenic B cells. We generated a PRR loss-of-function mouse model called RIC with mutations in Rigi, Ifih1 (MDA5), and Cgas. In both WT and RIC mutant B cells, EZH2 inhibition caused loss of H3K27me3 at repetitive elements and upregulated their expression. However, expression of inflammatory chemokines in B cells was interrupted by the RIC mutations. Furthermore, recruitment of cytotoxic T cells and neutrophils in response to EZH2 inhibition was blocked in RIC mutants preserving viability of B cells. This study demonstrates a pharmacologically induced mechanism of inflammation that causes self-recognition and B cell death.
2023-10-18 | GSE229684 | GEO
Project description:Schistosomiasis is a chronic and debilitating disease caused by a trematode of the genus Schistosoma. The current strategy for the control of the disease involves treatment with Praziquantel, the only available drug. The development of new drugs is therefore a top priority. Drugs that inhibit histone modifying enzymes have been used in cancer, altering gene expression, replication, repair and DNA recombination. Schistosoma parasites have some characteristics similar to malignant tumors, such as intense cell division and high levels of metabolic activity. Here we evaluate in Schistosoma mansoni the effect of GSK343, an inhibitor of the histone methyltransferase EZH2 that had been shown to arrest or reduce the growth of human cancer cells. We show that GSK343 causes damage to the parasite tegument and reduces egg laying in vitro, concomitant with a decrease in levels of H3K27me3, the histone mark put in place by EZH2. RNA-seq and proteomic analyses of treated parasites showed changes in the expression of hundreds of genes involved in important metabolic processes. In females, a marked decrease was observed in the expression of genes related to processes such as DNA replication and noncoding RNA metabolism. In conclusion, the histone methyltransferase EZH2 seems to be a promising novel drug target against schistosomiasis.
2018-11-23 | PXD010342 | Pride
Project description:The histone variant H2A.Z is central to early embryonic development, determining transcriptional competency through chromatin regulation of gene promoters and enhancers. In addition to genic loci, we find that H2A.Z resides at a subset of evolutionarily young repetitive elements, including DNA transposons, LINEs, and LTRs, during early zebrafish development. Moreover, increases in H2A.Z occur when repetitive elements become transcriptionally active. Acquisition of H2A.Z corresponds with a reduction in the repressive histone modification H3K9me3, and a moderate increase in chromatin accessibility. Notably however, de-repression of repetitive elements also leads to a significant reduction in H2A.Z over non-repetitive genic loci. Genic loss of H2A.Z is accompanied by transcriptional silencing at adjacent coding sequences, but remarkably, these impacts are mitigated by augmentation of total H2A.Z protein, via transgenic over-expression. Our study reveals that levels of H2A.Z protein determine embryonic sensitivity to de-repression of repetitive elements, that repetitive elements can function as a nuclear sink for epigenetic factors, and that competition for H2A.Z greatly influences overall transcriptional output during development. These findings uncover general mechanisms in which counteractive biological processes underlie phenotypic outcomes.
2023-10-23 | GSE162206 | GEO
Project description:The histone variant H2A.Z is central to early embryonic development, determining transcriptional competency through chromatin regulation of gene promoters and enhancers. In addition to genic loci, we find that H2A.Z resides at a subset of evolutionarily young repetitive elements, including DNA transposons, LINEs, and LTRs, during early zebrafish development. Moreover, increases in H2A.Z occur when repetitive elements become transcriptionally active. Acquisition of H2A.Z corresponds with a reduction in the repressive histone modification H3K9me3, and a moderate increase in chromatin accessibility. Notably however, de-repression of repetitive elements also leads to a significant reduction in H2A.Z over non-repetitive genic loci. Genic loss of H2A.Z is accompanied by transcriptional silencing at adjacent coding sequences, but remarkably, these impacts are mitigated by augmentation of total H2A.Z protein, via transgenic over-expression. Our study reveals that levels of H2A.Z protein determine embryonic sensitivity to de-repression of repetitive elements, that repetitive elements can function as a nuclear sink for epigenetic factors, and that competition for H2A.Z greatly influences overall transcriptional output during development. These findings uncover general mechanisms in which counteractive biological processes underlie phenotypic outcomes.
2023-10-23 | GSE197131 | GEO
Project description:The histone variant H2A.Z is central to early embryonic development, determining transcriptional competency through chromatin regulation of gene promoters and enhancers. In addition to genic loci, we find that H2A.Z resides at a subset of evolutionarily young repetitive elements, including DNA transposons, LINEs, and LTRs, during early zebrafish development. Moreover, increases in H2A.Z occur when repetitive elements become transcriptionally active. Acquisition of H2A.Z corresponds with a reduction in the repressive histone modification H3K9me3, and a moderate increase in chromatin accessibility. Notably however, de-repression of repetitive elements also leads to a significant reduction in H2A.Z over non-repetitive genic loci. Genic loss of H2A.Z is accompanied by transcriptional silencing at adjacent coding sequences, but remarkably, these impacts are mitigated by augmentation of total H2A.Z protein, via transgenic over-expression. Our study reveals that levels of H2A.Z protein determine embryonic sensitivity to de-repression of repetitive elements, that repetitive elements can function as a nuclear sink for epigenetic factors, and that competition for H2A.Z greatly influences overall transcriptional output during development. These findings uncover general mechanisms in which counteractive biological processes underlie phenotypic outcomes.
2023-10-23 | GSE237096 | GEO
Project description:The histone variant H2A.Z is central to early embryonic development, determining transcriptional competency through chromatin regulation of gene promoters and enhancers. In addition to genic loci, we find that H2A.Z resides at a subset of evolutionarily young repetitive elements, including DNA transposons, LINEs, and LTRs, during early zebrafish development. Moreover, increases in H2A.Z occur when repetitive elements become transcriptionally active. Acquisition of H2A.Z corresponds with a reduction in the repressive histone modification H3K9me3, and a moderate increase in chromatin accessibility. Notably however, de-repression of repetitive elements also leads to a significant reduction in H2A.Z over non-repetitive genic loci. Genic loss of H2A.Z is accompanied by transcriptional silencing at adjacent coding sequences, but remarkably, these impacts are mitigated by augmentation of total H2A.Z protein, via transgenic over-expression. Our study reveals that levels of H2A.Z protein determine embryonic sensitivity to de-repression of repetitive elements, that repetitive elements can function as a nuclear sink for epigenetic factors, and that competition for H2A.Z greatly influences overall transcriptional output during development. These findings uncover general mechanisms in which counteractive biological processes underlie phenotypic outcomes.
2023-10-23 | GSE237095 | GEO
Project description:Overexpression of EZH2 in estrogen receptor negative (ER-) breast cancer promotes metastasis. EZH2 has been mainly studied as the catalytic component of the Polycomb Repressive Complex 2 (PRC2) that mediates gene repression by trimethylating histone H3 at lysine 27 (H3K27me3). However, how EZH2 drives metastasis despite the low H3K27me3 levels observed in ER- breast cancer is unknown. We have shown that in human invasive carcinomas and distant metastases, cytoplasmic EZH2 phosphorylated at T367 is significantly associated with ER- disease and low H3K27me3 levels. Here, we explore the interactome of EZH2 and of a phosphodeficient mutant EZH2_T367A. We identified novel interactors of EZH2, and identified interactions that are dependent on the phosphorylation and cellular localization of EZH2 that may play a role in EZH2 dependent metastatic progression.
2018-07-03 | PXD010073 | Pride
Project description:The histone variant H2A.Z is central to early embryonic development, determining transcriptional competency through chromatin regulation of gene promoters and enhancers. In addition to genic loci, we find that H2A.Z resides at a subset of evolutionarily young repetitive elements, including DNA transposons, LINEs, and LTRs, during early zebrafish development. Moreover, increases in H2A.Z occur when repetitive elements become transcriptionally active. Acquisition of H2A.Z corresponds with a reduction in the repressive histone modification H3K9me3, and a moderate increase in chromatin accessibility. Notably however, de-repression of repetitive elements also leads to a significant reduction in H2A.Z over non-repetitive genic loci. Genic loss of H2A.Z is accompanied by transcriptional silencing at adjacent coding sequences, but remarkably, these impacts are mitigated by augmentation of total H2A.Z protein, via transgenic over-expression. Our study reveals that levels of H2A.Z protein determine embryonic sensitivity to de-repression of repetitive elements, that repetitive elements can function as a nuclear sink for epigenetic factors, and that competition for H2A.Z greatly influences overall transcriptional output during development. These findings uncover general mechanisms in which counteractive biological processes underlie phenotypic outcomes.
2023-10-23 | GSE220555 | GEO