ARID1A governs silencing of sex-linked transcription during male meiosis in the mouse [ATAC-seq]
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ABSTRACT:
PROVIDER: PRJNA936619 | ENA |
REPOSITORIES: ENA
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Project description:We present evidence implicating the BAF (BRG1/BRM Associated Factor) chromatin remodeler in meiotic sex chromosome inactivation (MSCI). By immunofluorescence (IF), the putative BAF DNA binding subunit, ARID1A (AT-rich Interaction Domain 1a), appeared enriched on the male sex chromosomes during diplonema of meiosis I. The germ cell-specific depletion of ARID1A resulted in a pachynema arrest and failure to repress sex-linked genes indicating a defective MSCI. Consistent with this defect, mutant sex chromosomes displayed an abnormal presence of elongating RNA polymerase II coupled with an overall increase in chromatin accessibility detectable by ATAC-seq. By investigating potential mechanisms underlying these anomalies, we identified a role for ARID1A in promoting the preferential enrichment of the histone variant, H3.3, on the sex chromosomes, a known hallmark of MSCI. Without ARID1A, the sex chromosomes appeared depleted of H3.3 at levels resembling autosomes. Higher resolution analyses by CUT&RUN revealed dramatic shifts in sex-linked H3.3 associations from discrete intergenic sites and broader gene-body domains to promoters in response to the loss of ARID1A. Several sex-linked sites displayed ectopic H3.3 occupancy that does not co-localize with DMC1 (DNA Meiotic Recombinase 1). This observation suggests a requirement for ARID1A in DMC1 localization to the asynapsed sex chromatids. We conclude that ARID1A-directed H3.3 localization influences sex chromosome gene regulation and DNA repair during meiosis I.
2024-02-19 | GSE225609 | GEO
Project description:We present evidence implicating the BAF (BRG1/BRM Associated Factor) chromatin remodeler in meiotic sex chromosome inactivation (MSCI). By immunofluorescence (IF), the putative BAF DNA binding subunit, ARID1A (AT-rich Interaction Domain 1a), appeared enriched on the male sex chromosomes during diplonema of meiosis I. The germ cell-specific depletion of ARID1A resulted in a pachynema arrest and failure to repress sex-linked genes indicating a defective MSCI. Consistent with this defect, mutant sex chromosomes displayed an abnormal presence of elongating RNA polymerase II coupled with an overall increase in chromatin accessibility detectable by ATAC-seq. By investigating potential mechanisms underlying these anomalies, we identified a role for ARID1A in promoting the preferential enrichment of the histone variant, H3.3, on the sex chromosomes, a known hallmark of MSCI. Without ARID1A, the sex chromosomes appeared depleted of H3.3 at levels resembling autosomes. Higher resolution analyses by CUT&RUN revealed dramatic shifts in sex-linked H3.3 associations from discrete intergenic sites and broader gene-body domains to promoters in response to the loss of ARID1A. Several sex-linked sites displayed ectopic H3.3 occupancy that does not co-localize with DMC1 (DNA Meiotic Recombinase 1). This observation suggests a requirement for ARID1A in DMC1 localization to the asynapsed sex chromatids. We conclude that ARID1A-directed H3.3 localization influences sex chromosome gene regulation and DNA repair during meiosis I.
2024-02-19 | GSE225611 | GEO
Project description:We present evidence implicating the BAF (BRG1/BRM Associated Factor) chromatin remodeler in meiotic sex chromosome inactivation (MSCI). By immunofluorescence (IF), the putative BAF DNA binding subunit, ARID1A (AT-rich Interaction Domain 1a), appeared enriched on the male sex chromosomes during diplonema of meiosis I. The germ cell-specific depletion of ARID1A resulted in a pachynema arrest and failure to repress sex-linked genes indicating a defective MSCI. Consistent with this defect, mutant sex chromosomes displayed an abnormal presence of elongating RNA polymerase II coupled with an overall increase in chromatin accessibility detectable by ATAC-seq. By investigating potential mechanisms underlying these anomalies, we identified a role for ARID1A in promoting the preferential enrichment of the histone variant, H3.3, on the sex chromosomes, a known hallmark of MSCI. Without ARID1A, the sex chromosomes appeared depleted of H3.3 at levels resembling autosomes. Higher resolution analyses by CUT&RUN revealed dramatic shifts in sex-linked H3.3 associations from discrete intergenic sites and broader gene-body domains to promoters in response to the loss of ARID1A. Several sex-linked sites displayed ectopic H3.3 occupancy that does not co-localize with DMC1 (DNA Meiotic Recombinase 1). This observation suggests a requirement for ARID1A in DMC1 localization to the asynapsed sex chromatids. We conclude that ARID1A-directed H3.3 localization influences sex chromosome gene regulation and DNA repair during meiosis I.
2024-02-19 | GSE225610 | GEO
Project description:ARID1A governs silencing of sex-linked transcription during male meiosis in the mouse.
| PRJNA936614 | ENA
Project description:ARID1A governs silencing of sex-linked transcription during male meiosis in the mouse [CUT&RUN]
| PRJNA936618 | ENA
Project description:ARID1A governs silencing of sex-linked transcription during male meiosis in the mouse [RNA-seq]
| PRJNA936620 | ENA
Project description:This SuperSeries is composed of the SubSeries listed below.
2024-02-19 | GSE225612 | GEO
Project description:AT-rich interactive domain-containing protein 1A (ARID1A), a SWI/SNF chromatin remodeling complex subunit, is frequently mutated across various cancer entities. ARID1A contributes to DNA damage response pathways, and we previously reported that ARID1A loss is associated with mutational signatures linked to DNA repair defects. Here we show that ARID1A is promoting both DNA double-strand breaks (DSBs) repair pathways, non-homologous end-joining (NHEJ) and homologous recombination (HR). ARID1A is accumulated at DSBs after DNA damage and regulates the chromatin loop formation at DSB sites by interacting with the cohesin subunit RAD21 and CTCF insulator protein promoting their enrichment around the DSBs. Further analysis demonstrates that ARID1A’s involvement in DSB repair is accompanied by alterations of chromatin accessibility and distribution of activating histone marks at DSBs. ARID1A binds to and promotes the recruitment of the HDAC1 to control transcription repression at these DSBs. Altogether, ARID1A simultaneously regulates DSB repair and transcription silencing in transcriptionally active chromatin. ARID1A depletion resulted in defective DSB repair, which subsequently led to accumulation of micronuclei, activation of cGAS-STING pathway and an increased expression of immunomodulatory cytokines and chemokines upon IR treatment. Furthermore, low ARID1A expression in cancer patients receiving radiotherapy was associated with higher infiltration of several immune cells. The high mutation rate of ARID1A in various cancer types highlights its clinical relevance as a promising biomarker that correlates with the level of immune regulatory cytokines and can estimate the levels of tumor-infiltrating immune cells and response to combination of radio- and immunotherapy.
2024-06-22 | PXD047225 | Pride
Project description:The study identifies genes that are regulated by the loss of the chromatin remodeller subunit ARID1A in colorectal cancer cell lines. This gene is frequently mutated in colorectal cancer.
2019-06-11 | E-MTAB-7791 | biostudies-arrayexpress
Project description:Arid1a is the subunit of SWI/SNF complex, which was reported to guide SWI/SNF to DNA. Here, we found that loss of Arid1a in the liver and other adult tissues results in improved organ regeneration. Within SWI/SNF complexes, Arid1a physically interacts with C/ebpα, a hepatocyte transcription factor that drives maturation and limits proliferation. Genome-wide analysis showed that loss of Arid1a reduces the recruitment and activity of C/ebpα on target promoters, resulting in expression programs that favor regeneration and cellular fitness during injury. Arid1a binding is enriched in promoters near transcriptional start sites (TSSs), and C/ebpα binds at precisely the same positions, indicating that Arid1a facilitates C/ebpα binding across the genome. Perfuse and isolate primary hepatocytes from mice livers, analysis of genomic occupancy of C/ebpα and H3K4me2 in hepatocytes from Arid1a WT and Arid1a liver specific KO mice by ChIP-seq. Analysis of genomic occupancy of Arid1a in the hepatocytes from V5-Arid1a transgenic mouse by ChIP-seq.
2016-03-30 | E-GEOD-65167 | biostudies-arrayexpress