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PR-DUB preserves Polycomb repression by preventing excessive accumulation of H2Aub1, an antagonist of nucleosome stacking

ABSTRACT: PR-DUB preserves Polycomb repression by preventing excessive accumulation of H2Aub1, an antagonist of nucleosome stacking

PROVIDER: PRJNA864800 | ENA |

REPOSITORIES: ENA

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PR-DUB preserves Polycomb repression by preventing excessive accumulation of H2Aub1, an antagonist of nucleosome stacking (ATAC-Seq)

Project description:The Polycomb repression machinery in Drosophila comprises PRC1 that monoubiquitinates histone H2A at lysine 118 (H2Aub1) and PR-DUB, a major H2Aub1 deubiquitinase, but how H2Aub1 levels must be balanced for Polycomb repression remains enigmatic. We show that H2Aub1 is enriched at Polycomb target genes in early embryos but depleted from these genes during developmental stages when PRC1 represses their transcription. Accordingly, Polycomb targets remain repressed in H2Aub1-deficient animals. In PR-DUB catalytic mutants, high-level H2Aub1 accumulation at Polycomb targets increases chromatin accessibility, consistent with disruption of chromatin fiber folding by H2Aub1 in vitro. Consequently, PR-DUB mutants show defective Polycomb repression, while general transcription is largely unperturbed by the genome-wide, low-level H2Aub1 increase. Changes in H2Aub1 levels alter H3K27 methylation-kinetics but PRC2 nevertheless generates canonical H3K27me3 domains in PRC1 or PR-DUB catalytic mutants. PR-DUB therefore acts as a rheostat that removes excessive H2Aub1 that, though deposited by PRC1, antagonizes PRC1-mediated chromatin compaction.

2022-11-09 | GSE210232 | GEO

PR-DUB preserves Polycomb repression by preventing excessive accumulation of H2Aub1, an antagonist of nucleosome stacking (RNA-Seq)

2022-11-09 | GSE210235 | GEO

PR-DUB preserves Polycomb repression by preventing excessive accumulation of H2Aub1, an antagonist of nucleosome stacking (ChIP-Seq)

2022-11-09 | GSE210233 | GEO

PR-DUB preserves Polycomb repression by preventing excessive accumulation of H2Aub1, an antagonist of nucleosome stacking (ChIP-Seq)

Project description:PR-DUB preserves Polycomb repression by preventing excessive accumulation of H2Aub1, an antagonist of nucleosome stacking (ChIP-Seq)

| PRJNA864812 | ENA

PR-DUB preserves Polycomb repression by preventing excessive accumulation of H2Aub1, an antagonist of nucleosome stacking (ATAC-Seq)

Project description:PR-DUB preserves Polycomb repression by preventing excessive accumulation of H2Aub1, an antagonist of nucleosome stacking (ATAC-Seq)

| PRJNA864798 | ENA

PR-DUB preserves Polycomb repression by preventing excessive accumulation of H2Aub1, an antagonist of nucleosome stacking (RNA-Seq)

Project description:PR-DUB preserves Polycomb repression by preventing excessive accumulation of H2Aub1, an antagonist of nucleosome stacking (RNA-Seq)

| PRJNA864811 | ENA

PR-DUB preserves Polycomb repression by preventing excessive accumulation of H2Aub1, an antagonist of nucleosome stacking

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

2022-11-09 | GSE210236 | GEO

PR-DUB preserves Polycomb repression by preventing excessive accumulation of H2Aub1, an antagonist of chromatin compaction.

Project description:The Polycomb repressive complexes PRC1, PRC2, and PR-DUB repress target genes by modifying their chromatin. In Drosophila, PRC1 compacts chromatin and monoubiquitinates histone H2A at lysine 118 (H2Aub1), whereas PR-DUB is a major H2Aub1 deubiquitinase, but how H2Aub1 levels must be balanced for Polycomb repression remains unclear. We show that in early embryos, H2Aub1 is enriched at Polycomb target genes, where it facilitates H3K27me3 deposition by PRC2 to mark genes for repression. During subsequent stages of development, H2Aub1 becomes depleted from these genes and is no longer enriched when Polycomb maintains them repressed. Accordingly, Polycomb targets remain repressed in H2Aub1-deficient animals. In PR-DUB catalytic mutants, high levels of H2Aub1 accumulate at Polycomb target genes, and Polycomb repression breaks down. These high H2Aub1 levels do not diminish Polycomb protein complex binding or H3K27 trimethylation but increase DNA accessibility. We show that H2Aub1 interferes with nucleosome stacking and chromatin fiber folding in vitro. Consistent with this, Polycomb repression defects in PR-DUB mutants are exacerbated by reducing PRC1 chromatin compaction activity, but Polycomb repression is restored if PRC1 E3 ligase activity is removed. PR-DUB therefore acts as a rheostat that removes excessive H2Aub1 that, although deposited by PRC1, antagonizes PRC1-mediated chromatin compaction.

| S-EPMC9744231 | biostudies-literature

Removal of H2Aub1 by ubiquitin-specific proteases 12 and 13 is required for stable Polycomb-mediated gene repression in Arabidopsis

Project description:Background: Stable gene repression is essential for normal growth and development. Polycomb Repressive Complexes 1 and 2 (PRC1 & PRC2) are involved in this process by establishing monoubiquitinated histone 2A (H2Aub1) and subsequent trimethylation of lysine 27 of histone 3 (H3K27me3). Previous work proposed that H2Aub1 removal by the ubiquitin-specific proteases 12 and 13 (UBP12 & UBP13) is part of the repressive PRC1&2 system, but its functional role remains elusive. Results: We show that UBP12 and UBP13 work together with PRC1, PRC2, and EMF1 to repress genes involved in stimulus response. We found that H2Aub1 is associated with responsiveness, and that it’s only indirectly repressive via PRC2 recruitment. Our analyses also revealed that PR2 targets that do not require PRC1 are pre-repressed. Lastly, we have found that removal of H2Aub1 by UBP12/13 prevents loss of H3K27me3, consistent with our finding that the H3K27me3 demethylase REF6 is enriched at H2Aub1 marked genes. Conclusions: Our data allow us to propose a model in which deposition of H2Aub1 permits recruitment of PRC2 and provides a state that allows for a rapid switch between gene activation and repression. Removal of H2Aub1 by UBP12/13 is required to achieve stable repression.

2020-05-19 | GSE131756 | GEO

ChIP-chip of Drosophila Polycomb group proteins Asx and Calypso (PR-DUB) in larvae

Project description:Analysis of binding profile of the Polycomb group proteins Calypso and Asx (PR-DUB) in Drosophila melanogaster larvae.

2010-05-03 | E-TABM-908 | biostudies-arrayexpress