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H2AZ extended acidic patch is necessary for formation specialized chromatin states in ESCs [ChIP-Seq]

ABSTRACT: The H2A variant H2AZ is essential for embryonic development and for proper execution of developmental gene expression programs in embryonic stem cells (ESCs). Divergent regions in H2AZ are likely key for its functional specialization, but we know little about how these differences contribute to chromatin regulation. Here, we show that the extended acidic patch, specifically the three divergent residues in the C-terminal docking domain, is necessary for lineage commitment during ESC differentiation and proper execution of gene expression programs during ESC differentiation. Surprisingly, disruption of the acidic patch domain has a distinct consequence on cellular specification compared to H2AZ depletion. This is consistent with differences in gene expression profiles of H2AZ –depleted and acidic patch (AP) mutant ESCs during early lineage commitment. Interestingly, the distinct consequence of AP mutant expression on gene regulation is coincidence with an altered destabilized chromatin state and high chromatin mobility dependent on active transcription. Collectively, our data shows that the divergent residues within the acidic patch domain are key structural determinants of H2AZ function and links chromatin structure and dynamics with gene regulation and cell fate specification.

ORGANISM(S): Mus musculus

PROVIDER: GSE40063 | GEO | 2013/09/23

SECONDARY ACCESSION(S): PRJNA172650

REPOSITORIES: GEO

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H2AZ extended acidic patch is necessary for formation specialized chromatin states in ESCs [RNA-Seq]

Project description:The H2A variant H2AZ is essential for embryonic development and for proper execution of developmental gene expression programs in embryonic stem cells (ESCs). Divergent regions in H2AZ are likely key for its functional specialization, but we know little about how these differences contribute to chromatin regulation. Here, we show that the extended acidic patch, specifically the three divergent residues in the C-terminal docking domain, is necessary for lineage commitment during ESC differentiation and proper execution of gene expression programs during ESC differentiation. Surprisingly, disruption of the acidic patch domain has a distinct consequence on cellular specification compared to H2AZ depletion. This is consistent with differences in gene expression profiles of H2AZ M-bM-^@M-^Sdepleted and acidic patch (AP) mutant ESCs during early lineage commitment. Interestingly, the distinct consequence of AP mutant expression on gene regulation is coincidence with an altered destabilized chromatin state and high chromatin mobility dependent on active transcription. Collectively, our data shows that the divergent residues within the acidic patch domain are key structural determinants of H2AZ function and links chromatin structure and dynamics with gene regulation and cell fate specification. H2AZ extended acidic patch was mutated, or H2AZ was KD in mouse embryonic stem cells and RNA-Seq analysis was performed on the resulting cultures. Characterization of H2AZ-WT and -AP3-mutant binding specificities were performed by ChIP-Seq.

2013-09-23 | E-GEOD-40064 | biostudies-arrayexpress

H2AZ extended acidic patch is necessary for formation specialized chromatin states in ESCs [ChIP-Seq]

2013-09-23 | E-GEOD-40063 | biostudies-arrayexpress

H2AZ extended acidic patch is necessary for formation specialized chromatin states in ESCs [RNA-Seq]

Project description:The H2A variant H2AZ is essential for embryonic development and for proper execution of developmental gene expression programs in embryonic stem cells (ESCs). Divergent regions in H2AZ are likely key for its functional specialization, but we know little about how these differences contribute to chromatin regulation. Here, we show that the extended acidic patch, specifically the three divergent residues in the C-terminal docking domain, is necessary for lineage commitment during ESC differentiation and proper execution of gene expression programs during ESC differentiation. Surprisingly, disruption of the acidic patch domain has a distinct consequence on cellular specification compared to H2AZ depletion. This is consistent with differences in gene expression profiles of H2AZ –depleted and acidic patch (AP) mutant ESCs during early lineage commitment. Interestingly, the distinct consequence of AP mutant expression on gene regulation is coincidence with an altered destabilized chromatin state and high chromatin mobility dependent on active transcription. Collectively, our data shows that the divergent residues within the acidic patch domain are key structural determinants of H2AZ function and links chromatin structure and dynamics with gene regulation and cell fate specification.

2013-09-23 | GSE40064 | GEO

Project description:H2AZ extended acidic patch is necessary for formation specialized chromatin states in ESCs

| PRJNA172649 | ENA

The nucleosome acidic patch directly interacts with subunits of the Paf1 and FACT complexes and controls chromatin architecture in vivo

Project description:We employed MNase-seq and ChIP-seq to determine irregularities in chromatin architecture in mutants of the nucleosome acidic patch. Indeed, the acidic patch mutant showed defects in nucleosome positioning and occupancy at genes with high expression and H2B K123ub levels, linking the acidic patch to transcription-dependent chromatin changes. Our results emphasize the importance of the nucleosome core as a hub for proteins that regulate chromatin during transcription.

2019-06-11 | GSE121543 | GEO

Mus musculus

Project description:H2AZ extended acidic patch is necessary for formation specialized chromatin states in ESCs [ChIP-Seq]

| PRJNA172650 | ENA

Mus musculus

Project description:H2AZ extended acidic patch is necessary for formation specialized chromatin states in ESCs [RNA-Seq]

| PRJNA172651 | ENA

Chromatin immunopreciptiation of H2AZ in mouse embryonic stem cells and neural precursor cells

Project description:Elucidating how chromatin organization influences gene expression patterns and ultimately cell fate is fundamental to understanding development and disease. Histone variants have emerged as key regulators of genome function by creating specialized chromatin domains. The histone variant H2AZ plays an essential, but poorly understood function during early mammalian development. Genome-wide analysis reveals that H2AZ is enriched at a large class of developmentally important genes that are known targets of Polycomb-mediated repression in embryonic stem (ES) cells. H2AZ displays a highly defined spatial patterning that is remarkably similar to the Polycomb group (PcG) protein Suz12 in ES cells, but not in differentiated cell types. By using RNA interference, we demonstrate that H2AZ is a critical regulatory component at developmental genes in ES cells and show that localization of H2AZ and PcG proteins is interdependent at target promoters. Moreover, similarly to Suz12, H2AZ is required for lineage commitment. This study reveals a connection between H2AZ and PcG proteins in ES cells and suggests that these factors functionally interact to regulate chromatin states necessary for the proper execution of developmental gene expression programs.

2009-01-22 | E-TABM-556 | biostudies-arrayexpress

Structural basis of paralog-specific KDM2A/B nucleosome recognition

Project description:The nucleosome acidic patch is a major interaction hub for chromatin, providing a platform for enzymes to dock and orient for nucleosome-targeted activities. In order to define the molecular basis of acidic patch recognition proteome-wide, we performed an amino acid resolution acidic patch interactome screen. We discovered that the histone H3 lysine 36 (H3K36) demethylase KDM2A, but not its closely related paralog, KDM2B, requires the acidic patch for nucleosome binding. These KDM2 family JumonjiC (JmjC) domain lysine demethylases are critical to heterochromatin formation and are commonly misregulated in cancer. Despite fundamental roles in transcriptional regulation in health and disease, the molecular mechanisms governing nucleosome substrate specificity of KDM2A/B, or any other JmjC lysine demethylases, remain unclear. We used a covalent JmjC inhibitor to solve cryo-EM structures of KDM2A and KDM2B trapped in action on the nucleosome. Our structures show that KDM2-nucleosome binding is paralog-specific and facilitated by dynamic nucleosomal DNA unwrapping and histone charge shielding that mobilize the H3K36 sequence for demethylation.

2023-02-14 | PXD032791 | Pride

Structure of the ISW1a complex bound to the dinucleosome

Project description:Nucleosomes are basic repeating units of chromatin, and form regularly spaced arrays in cells. Chromatin remodelers alter the positions of nucleosomes, and are vital in regulating chromatin organization and gene expression. Here we report the cryoEM structure of chromatin remodeler ISW1a complex bound to the dinucleosome. Each subunit of the complex recognizes a different nucleosome. The motor subunit binds to the mobile nucleosome and recognizes the acidic patch through two arginine residues, and the DNA-binding module interacts with the entry DNA at the nucleosome edge. This nucleosome-binding mode provides the structural basis for linker DNA sensing of the motor. Notably, the Ioc3 subunit recognizes the disk face of the adjacent nucleosome through interacting with the H4 tail, the acidic patch and the nucleosomal DNA, which plays a role in the spacing activity in vitro, and in nucleosome organization and cell fitness in vivo. Together, these findings support the nucleosome spacing activity of ISW1a, and add a new mode of nucleosome remodeling in the context of a chromatin environment.

2023-08-09 | GSE240192 | GEO

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