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Abo1 is required for H3K9me2 to H3K9me3 transition in telomeric and centromeric heterochromatin [ChIP-seq]

ABSTRACT: Abo1 is required for H3K9me2 to H3K9me3 transition in telomeric and centromeric heterochromatin [ChIP-seq]

PROVIDER: PRJNA517936 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8508240.fastq.gz	Fastqsanger.gz
	SRR8508241.fastq.gz	Fastqsanger.gz
	SRR8508234.fastq.gz	Fastqsanger.gz
	SRR8508235.fastq.gz	Fastqsanger.gz
	SRR8508236.fastq.gz	Fastqsanger.gz

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Abo1 is required for H3K9me2 to H3K9me3 transition in telomeric and centromeric heterochromatin [ChIP-seq]

Project description:Regulation of heterochromatin is critical for genome stability. Different states of methylated H3K9 have been discovered with distinct roles in heterochromatin formation and silencing. However, the control of the transition from H3K9me2 to H3K9me3 is still unclear. Here we investigate the role of the conserved bromodomain AAA-ATPase, Abo1, involved in maintaining the global nucleosome organization in fission yeast. We identified several key factors involved in heterochromatin silencing to interact genetically with Abo1: the histone deacetylase Clr3, the H3K9 methyltransferase Clr4, and the HP1 homologue Swi6. Cells lacking Abo1 display an imbalance of H3K9me2 and H3K9me3 in heterochromatin. In abo1∆ cells, the centromeric constitutive heterochromatin had increased H3K9me2 but decreased H3K9me3 levels compared to wild type. In contrast, facultative heterochromatin regions, show both reduced H3K9me2 and H3K9me3 levels in abo1∆. Genome-wide analysis showed that abo1∆ cells have silencing defects in both centromeres and subtelomeres, but not in a subset of heterochromatin islands. Our work uncovers a new role for Abo1 in supporting Clr4 activity and allowing for the transition of H3K9me2 to H3K9me3 in telomeric and centromeric heterochromatin.

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Abo1 is required for H3K9me2 to H3K9me3 transition in telomeric and centromeric heterochromatin [gene expression]

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Abo1 is required for H3K9me2 to H3K9me3 transition in telomeric and centromeric heterochromatin

Project description:Abo1 is required for H3K9me2 to H3K9me3 transition in telomeric and centromeric heterochromatin

| PRJNA517934 | ENA

Abo1 is required for H3K9me2 to H3K9me3 transition in telomeric and centromeric heterochromatin [gene expression]

Project description:Abo1 is required for H3K9me2 to H3K9me3 transition in telomeric and centromeric heterochromatin [gene expression]

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Chromatin immunoprecipitation of Arabidopsis seedlings to identify targets of TERMINAL FLOWER 2/LIKE HETEROCHROMATIN PROTEIN 1 and H3K27me3, H3K9me2 and H3K9me3

Project description:Chromatin immunoprecipitation and hybridization to a chromosome-wide DNA tiling array (ChIP-chip)was performed to identify the targets of the chromatin protein TERMINAL FLOWER 2/LIKE HETEROCHROMATIN PROTEIN 1. Epigenomic profiling was also carried out for three histone H3 modifications: H3K27me3, H3K9me2 and H3K9me3. Experiments were done using two independent biological replicates.

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Abo1 is required for H3K9me2 to H3K9me3 transition in telomeric and centromeric heterochromatin

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

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Arabidopsis AGDP1 links H3K9me2 to DNA methylation in heterochromatin

Project description:Heterochromatin is a tightly packed form of DNA, which is associated with histone 3 lysine 9 methylation (H3K9me). Here, we identify an H3K9me2 binding protein, Agenet domain (AGD)-containing protein 1 (AGDP1), in Arabidopsis thaliana. Our biochemical studies revealed that the AGDP1 can specifically recognize the H3K9me2 marks by the three pairs of tandem-AGDs. We determined the crystal structure of the AGD12 of Raphanus sativus AGDP1 in complex with an H3K9me2 peptide. In the complex, the histone peptide adopts a unique helical conformation. AGD12 employs a newly defined interacting interface to specifically recognize the H3K4me0 and H3K9me2 marks. In addition, we found that AGDP1 is required for transcriptional gene silencing, non-CG DNA methylation, and H3K9 dimethylation. Our ChIP-seq data showed that AGDP1 is enriched in TE regions and associated with the heterochromatin marks. Our findings suggest that, as a heterochromatin binding protein, AGDP1 links H3K9me2 to DNA methylation in heterochromatin regions.

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Project description:H3K9me3-heterochromatin, compacted by HP1 proteins, restricts transcription factor binding and functions as a barrier to cell fate changes in development and reprogramming1,2. To investigate principles underlying H3K9me3-heterochromatin maintenance in mammalian cells, we applied degron engineering3,4 on mouse ESCs to conditionally deplete all three H3K9me3-methyltransferases within one hour and found an unexpectedly dynamic nature of heterochromatin maintenance. Following H3K9me3 methyltransferases degradation, HP1β dissociates from heterochromatin within three hours, and transcription factors quickly access the de-compacted heterochromatin, activating transcription of their targets, which then promotes H3K9me3 decay. Both passive dilution and active removal contribute to the H3K9me3 decay. Mathematical modeling reveals distinct H3K9me3 heterochromatin states with diverse chromatin features which influence initial H3K9me3 levels and the stability of H3K9me3 domains, thereby expanding our understanding of distinct heterochromatin domains. Rampant transposable element de-repression interferes with transcription of poised early developmental and signaling genes outside H3K9me3-domains, highlighting the intricate roles of dynamic H3K9me3-heterochromatin maintenance in safeguarding developmental programs. Our findings deconvolve the hierarchical relationships between H3K9me3 marks, methyltransferases, HP1 and transcription factors to reveal principles of H3K9me3-heterochromatin maintenance and how its remodeling enables transcription and cell fate change.

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