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H3K27M in Gliomas Causes a One-step Decrease in H3K27 Methylation and Reduced Spreading Within the Constraints of H3K36 Methylation

ABSTRACT: H3K27M in Gliomas Causes a One-step Decrease in H3K27 Methylation and Reduced Spreading Within the Constraints of H3K36 Methylation

PROVIDER: PRJNA616357 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR11453000_1.fastq.gz	Fastqsanger.gz
	SRR11453000_2.fastq.gz	Fastqsanger.gz
	SRR11453001_1.fastq.gz	Fastqsanger.gz
	SRR11453001_2.fastq.gz	Fastqsanger.gz
	SRR11453002_1.fastq.gz	Fastqsanger.gz

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H3K27M in Gliomas Causes a One-step Decrease in H3K27 Methylation and Reduced Spreading Within the Constraints of H3K36 Methylation [WGBS]

Project description:The discovery of H3K27M mutations in pediatric gliomas marked a new chapter in cancer epigenetics. Numerous studies have investigated the effect of this mutation on H3K27 trimethylation, but only recently have we started to realize its additional effects on the epigenome. Here, we use isogenic glioma H3K27M(+/-) cell lines to investigate H3K27 methylation and its interaction with H3K36 and H3K9 modifications. We describe a “Step Down” effect of H3K27M on the distribution of H3K27 methylation: me3 is reduced to me2, me2 is reduced to me1, while H3K36me2/3 delineate the boundaries for the spread of H3K27me marks. We also observe a replacement of H3K27me2/3 silencing by H3K9me3. Using a computational simulation, we explain our observations by reduced effectiveness of PRC2 and constraints imposed on deposition of H3K27me by antagonistic H3K36 modifications. Our work further elucidates the effect of H3K27M in gliomas, as well as general principles of deposition of H3K27 methylation.

2020-11-17 | GSE147782 | GEO

H3K27M in Gliomas Causes a One-step Decrease in H3K27 Methylation and Reduced Spreading Within the Constraints of H3K36 Methylation [RNA-seq]

2020-11-17 | GSE148062 | GEO

H3K27M in Gliomas Causes a One-step Decrease in H3K27 Methylation and Reduced Spreading Within the Constraints of H3K36 Methylation [ChIP-seq]

2020-11-17 | GSE147780 | GEO

H3K27M in Gliomas Causes a One-step Decrease in H3K27 Methylation and Reduced Spreading Within the Constraints of H3K36 Methylation

Project description:H3K27M in Gliomas Causes a One-step Decrease in H3K27 Methylation and Reduced Spreading Within the Constraints of H3K36 Methylation

| PRJNA616357 | ENA

H3K27M in Gliomas Causes a One-step Decrease in H3K27 Methylation and Reduced Spreading Within the Constraints of H3K36 Methylation [WGBS]

Project description:H3K27M in Gliomas Causes a One-step Decrease in H3K27 Methylation and Reduced Spreading Within the Constraints of H3K36 Methylation [WGBS]

| PRJNA616360 | ENA

H3K27M in Gliomas Causes a One-step Decrease in H3K27 Methylation and Reduced Spreading Within the Constraints of H3K36 Methylation [ChIP-seq]

Project description:H3K27M in Gliomas Causes a One-step Decrease in H3K27 Methylation and Reduced Spreading Within the Constraints of H3K36 Methylation [ChIP-seq]

| PRJNA616361 | ENA

H3K27M in Gliomas Causes a One-step Decrease in H3K27 Methylation and Reduced Spreading Within the Constraints of H3K36 Methylation [RNA-seq]

Project description:H3K27M in Gliomas Causes a One-step Decrease in H3K27 Methylation and Reduced Spreading Within the Constraints of H3K36 Methylation [RNA-seq]

| PRJNA622975 | ENA

H3K27M in Gliomas Causes a One-Step Decrease in H3K27 Methylation and Reduced Spreading within the Constraints of H3K36 Methylation.

Project description:The discovery of H3K27M mutations in pediatric gliomas marked a new chapter in cancer epigenomics. Numerous studies have investigated the effect of this mutation on H3K27 trimethylation, but only recently have we started to realize its additional effects on the epigenome. Here, we use isogenic glioma H3K27M+/- cell lines to investigate H3K27 methylation and its interaction with H3K36 and H3K9 modifications. We describe a "step down" effect of H3K27M on the distribution of H3K27 methylation: me3 is reduced to me2, me2 is reduced to me1, whereas H3K36me2/3 delineates the boundaries for the spread of H3K27me marks. We also observe a replacement of H3K27me2/3 silencing by H3K9me3. Using a computational simulation, we explain our observations by reduced effectiveness of PRC2 and constraints imposed on the deposition of H3K27me by antagonistic H3K36 modifications. Our work further elucidates the effects of H3K27M in gliomas as well as the general principles of deposition in H3K27 methylation.

| S-EPMC7703850 | biostudies-literature

H3K27M in Gliomas Causes a One-step Decrease in H3K27 Methylation and Reduced Spreading Within the Constraints of H3K36 Methylation

Project description:This SuperSeries is composed of the SubSeries listed below.

2020-11-17 | GSE147783 | GEO

The H3K36me2 writer-reader dependency in H3K27M-DIPG

Project description:The lysine-to-methionine mutation at residue 27 of histone H3 (H3K27M) is a driving mutation in Diffuse Intrinsic Pontine Glioma (DIPG), a highly aggressive form of pediatric brain tumor with no effective treatment and little chance of survival. H3K27M reshapes the epigenome through a global inhibition of PRC2 catalytic activity, displacement of methylation at lysine 27 of histone H3 (H3K27me2/3), and thus promoting oncogenesis of DIPG. As a consequence, a histone modification H3K36me2, antagonistic to H3K27me2/3, is aberrantly elevated. Here, we investigate the role of H3K36me2 in H3K27M-DIPG by tackling its upstream catalyzing enzymes (writers) and downstream binding factors (readers). We determine that NSD1 and NSD2 are the key writers for H3K36me2. Loss of NSD1/2 in H3K27M-DIPG impedes cellular proliferation in vitro and tumorigenesis in vivo, and disrupts tumor-promoting gene expression programs. Further, we demonstrate that LEDGF and HDGF2 are the main readers that mediate the pro-tumorigenic effects downstream of NSD1/2-H3K36me2. Treatment with a chemically modified peptide mimicking endogenous H3K36me2 dislodges LEDGF/HDGF2 from chromatin and specifically inhibits the proliferation of H3K27M-DIPG. Together, our results indicate a functional pathway of NSD1/2-H3K36me2-LEDGF/HDGF2 as an acquired dependency in H3K27M-DIPG and suggest a possibility to target this pathway for therapeutic interventions.

2021-07-21 | GSE174006 | GEO

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