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Genome-wide map of H3K27me3 before and after AKBA treatment in HaCaT cells

ABSTRACT: The goal of this study was to compare the distribution of H3K4me3 before and after AKBA treatment to understand how small molecule AKBA affects the epigenetic state. To do this we performed ChIP-seq with an H3K27me3 antibody.

ORGANISM(S): Homo sapiens

PROVIDER: GSE112142 | GEO | 2018/03/22

REPOSITORIES: GEO

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Genome-wide map of H3K27me3 before and after AKBA treatment in HaCaT cells

Project description:Genome-wide map of H3K27me3 before and after AKBA treatment in HaCaT cells

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CUT&RUN against H3K4me3 and H3K27me3 in E16 and L3 neurons

Project description:Investigate the distribution of H3K4me3 and H3K27me3 marks in sorted neurons during development in stage 16 embryos and L3 neurons. The aim is to compare those profiles to ATACseq and RNAseq in same stages

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Genome-wide profiling for h3k4me3, h3k27me3, and h3k9me3 in Uhrf1hepKO mouse livers

Project description:This study was carried out to investigate potential changes in the genome-wide distribution of h3k4me3, h3k27me3, and h3k9me3 in Uhrf1hepKO mouse livers compared to wild-type.

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Genome-wide map of H3K4me3 before and after methionine restriction in HCT116 cells.

Project description:The goals of this study were to compare the distribution of H3K4me3 before and after methionine restriction to understand how nutrient availability and alterations in methionine metabolism affect the epigenetic state and regulate gene transcription. To do this we performed ChIP-seq with an H3K4me3 antibody and RNA-seq using PolyA+ mRNA.

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Examining the effect of the linker DNA length on protein binding to di-nucleosomes decorated with H3K9me3 and H3K27me3

Project description:Characteristic features of chromatin states are not limited to particular epigenetic modifications but include other regulatory cues, such as linker DNA length, typically ranging from between 35-55 bp (Valouev et al, 2011; Voong et al., 2016, Cell) to over 200 bp in nucleosome-depleted regions (NDRs) found at active enhancers and promoters (Schones et al, 2008; Hansen He et al, 2010). To investigate whether and how the nucleosome linker DNA affects chromatin recognition by nuclear proteins we performed a set of affinity purifications using di-nucleosomes incorporating different DNA linkers. This dataset contains experiments aimed to probe how the linker DNA length affects protein binding to di-nucleosomes decorated with H3K9me3 or H3K27me3. The following di-nucleosomes were used in affinity pull-down purifications with HeLa nuclear extract followed by label-free MS: 1. unmod. H3, 35 bp linker 2. unmod. H3, 40 bp linker 3. unmod. H3, 45 bp linker 4. unmod. H3, 50 bp linker 5. unmod. H3, 55 bp linker 6. H3K9me3, 35 bp linker 7. H3K9me3, 40 bp linker 8. H3K9me3, 45 bp linker 9. H3K9me3 50 bp linker 10. H3K9me3, 55 bp linker 11. H3K27me3, 35 bp linker 12. H3K27me3, 40 bp linker 13. H3K27me3, 45 bp linker 14. H3K27me3, 50 bp linker 15. H3K27me3, 55 bp linker

2023-12-10 | PXD042368 | Pride

Arabidopsis TRB proteins function in H3K4me3 demethylation by recruiting JMJ14

Project description:Arabidopsis telomeric repeat binding factors (TRBs) can bind telomeric DNA sequences to protect telomeres from degradation. TRBs can also recruit Polycomb Repressive Complex 2 (PRC2) to deposit tri-methylation of H3 lysine 27 (H3K27me3) over certain target loci. Here, we demonstrate that TRBs also associate and colocalize with JUMONJI14 (JMJ14) and trigger H3K4me3 demethylation at some loci. The trb1/2/3 triple mutant and the jmj14-1 mutant show an increased level of H3K4me3 over TRB and JMJ14 binding sites, resulting in up-regulation of their target genes. Furthermore, tethering TRBs to the promoter region of genes with an artificial zinc finger (TRB-ZF) successfully triggers target gene silencing, as well as H3K27me3 deposition, and H3K4me3 removal. Interestingly, JMJ14 is predominantly recruited to ZF off-target sites with low levels of H3K4me3, which is accompanied with TRB-ZFs triggered H3K4me3 removal at these loci. These results suggest that TRB proteins coordinate PRC2 and JMJ14 activities to repress target genes via H3K27me3 deposition and H3K4me3 removal.

2023-02-22 | MSV000091349 | MassIVE

Genome wide map of H3K27me3 histone mark remeains unaltered after silecing of lncRNA SCIRT

Project description:We generated genome wide map of H3K27me3 histone mark in mammospheres where we silenced lncRNA SCIRT, PRC2 member EZH2. We discovered that upon silencing of lncRNA SCIRT and EZH2, the distribution of this histone mark does not change. This indicates that lncRNA SCIRT is important for EZH2 function that is independant of its activity as a histone methyltranspherase.

2021-02-23 | GSE136186 | GEO

Chip-chip from Hepatocellular carcinoma (HCC) specimens with H3K27me3

Project description:Epigenetic changes commonly occur in hepatocellular carcinoma (HCC) and are associated with aberrant gene expression. Recently, we demonstrated the pivotal role of abnormal H3K4me3 methylation, which is catalyzed by the menin/MLL, a TrxG family, in HCC development. Meanwhile, there is clear evidence that increasing global levels of H3K27me3 are activated in human primary HCC. To further elucidate the functional relatedness of the repressive H3K27me3 and active H3K4me3 histone remodeling in HCC, we performed H3K27me3 and H3K4me3 ChIP-on-chip screen using three HCC specimens and their adjacent tissues. Comparison of ChIP-on-chip results between tumor(C) and adjacent tissues(N) from three HCC specimens with H3K27me3

2013-11-13 | E-GEOD-52301 | biostudies-arrayexpress

Genome-wide H3K27me3 analysis in Arabidopsis

Project description:To explore the bivalent histone modifications in the Arabidopsis genome, we examined genome-wide histone 3 lysine-27 trimethylation (H3K27me3) and histone 3 lysine-4 trimethylation (H3K4me3) in 5-day-old seedlings (Col-0) by ChIP-seq. We found that more than 1300 genes loci contain both H3K27me3 and H3K4me3.

2023-02-28 | GSE185120 | GEO

H3K4me3/H3K27me3 bivalent chromatin function to fine-tune gene expression level

Project description:Bivalency, the paradoxical juxtaposition of transcriptionally activating trimethylation of histone H3 lysine 4 (H3K4me3) and the repressive trimethylation of histone H3 lysine 27 (H3K27me3), has been proposed to decorate developmental genes poised for gene expression regulation. Here, we report development of sequential internally calibrated chromatin immunoprecipitation (Re-ICeChIP-seq), capable of measuring absolute quantities of nucleosomal patterns of histone marks in a genome-wide fashion, combined with in situ control of antibody specificity. Re-ICeChIP-seq of H3K4me3/H3K27me3 in mESC reveals that bivalent genes can be delineated into two classes, distinguished by the nucleosomal ratio of H3K4me3 to H3K27me3. Consistent with the canonical role of bivalency, H3K27me3-rich bivalent nucleosomes demarcate promoters of poorly expressed developmental genes that may be poised for activation or repression. Yet our measurements reveal surprisingly widespread presence of bivalency at promoters of highly-expressed housekeeping genes, characterized by H3K4me3-rich bivalent nucleosomes. Moreover, the ratio of H3K4me3 to H3K27me3 at transcription start sites better correlates with gene expression than H3K4me3 or H3K27me3 alone, suggesting cooperation between opposing marks to fine-tune gene expression. Finally, we report that major H3K4 methyltransferases exhibit wide acceptance of various H3K27me3 substrates.

2021-01-04 | GSE108747 | GEO

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