Similar Datasets
Project description:The BAF complex modulates chromatin accessibility. Specific BAF configurations have functional consequences, and subunit switches are essential for cell differentiation. ARID1B and its paralog ARID1A encode for mutually exclusive BAF subunits. De novo ARID1B haploinsufficient mutations cause a neurodevelopmental disorder spectrum, including Coffin-Siris syndrome, which is characterized by neurological and craniofacial features. Here, we reprogrammed ARID1B+/- Coffin-Siris patient-derived skin fibroblasts into iPSCs, and modeled cranial neural crest cell (CNCC) formation. We discovered that ARID1B is active only during the first stage of this process, coinciding with neuroectoderm specification, where it is part of a lineage-specific BAF configuration (ARID1B-BAF), including SMARCA4, and nine additional subunits. ARID1B-BAF acts as a gate-keeper, ensuring exit from pluripotency and lineage commitment, by attenuating NANOG, SOX2 and the thousands of enhancers directly regulated by these two pluripotency factors at the iPSC stage. In iPSCs, these enhancers are maintained active by an ARID1A-containing BAF. At the onset of differentiation, cells transition from ARID1A-BAF to ARID1B-BAF, eliciting attenuation of the NANOG/SOX2 networks, and triggering pluripotency exit. Coffin-Siris patient cells fail to perform the ARID1A/ARID1B switch, and maintain ARID1A-BAF at pluripotency enhancers throughout all stages of CNCC formation. This leads to a persistent and aberrant SOX2 and NANOG activity, which impairs CNCC formation. In fact, despite showing the typical neural crest signature (TFAP2A+, SOX9+), the ARID1B-haploinsufficient CNCCs are also NANOG-positive, in stark contrast with the ARID1B-wt CNCCs, which are NANOG-negative. These findings suggest a connection between ARID1B mutations, neuroectoderm formation, and a pathogenic mechanism for Coffin-Siris syndrome.
2021-10-12 | PXD028557 | Pride
Project description:We transduced either an empty vector or ARID1B cDNA in IMR90 cells. Cells were selected with puromycin and 6 days after the infection we collected the RNA. ARID1B is a member of the SWI/SNF chromatin-remodeling complex. Our previous experiments showed that knockdown of ARID1B allows cells to bypass cellular senescence. By performing RNA-seq we have shown that ARID1B expression can induce a set of genes involved in the senescence response.
2016-11-12 | GSE75291 | GEO
Project description:To identify ARID1B associated genes in development of neural progenitor , we carried out RNA-seq gene expression profiling analysis in primarily cultured neurospheres from ARID1B haploinsufficient and control mice. 3 biological independent sample from ARID1B hi (hGAFPCre+;ARID1B flox/+) mice were compared with 2 independent litermate control (hGAFPCre+; ARID1B +/+) samples.
2021-01-07 | GSE143171 | GEO
Project description:There is growing evidence for the involvement of ARID1B, a SWI/SNF ATP-dependent chromatin remodeling subunit, in a broad range of human disorders. Sequencing studies have recurrently implicated ARID1B haploinsufficiency in autism spectrum disorder (ASD), non-syndromic intellectual disability (ID), corpus callosum agenesis, and short stature. In addition, ARID1B is by far the most common cause of Coffin-Siris Syndrome (CSS), a monogenic developmental delay syndrome characterized by a combination of the neuropsychiatric and physical abnormalities mentioned above. To understand how ARID1B mutations lead to these phenotypes, we generated Arid1b mutant mice, which exhibited physical manifestations of developmental delay and behaviors reminiscent of ASD. In the brain, Arid1b haploinsufficiency resulted in changes in the expression of SWI/SNF- regulated genes implicated in ASD.
2017-06-26 | GSE92238 | GEO
Project description:Arid1b is a chromatin remodeler implicated in neurodevelopmental disorders. Arid1b mutant mice with haploinsufficiency (Arid1b HT) displayed persistent excitatory synaptic dysfunction from juvenile to adult stage, decreased synaptic density and transmission. Moreover, they showed autistic-like behaviors in both of early and adult stages, decreased sociability in pup USV calling and adult social interaction, and adult repetitive grooming. To investigate early transcriptomic changes in Arid1b mutant mice, RNAseq analysis of prefrontal cortex from wild-type and Arid1b mutant mice at postnatal day 10 was done. Transcriptomic changes support these electrophysiological and behavioral deficits. Arid1b HT mice at postnatal day 10 showed alterations in genes implicated in synaptic functions and ASD.
2022-07-21 | GSE203249 | GEO
Project description:Arid1b is a chromatin remodeler implicated in neurodevelopmental disorders. Arid1b mutant mice with haploinsufficiency (Arid1b HT) displayed persistent excitatory synaptic dysfunction from juvenile to adult stage, decreased synaptic density and transmission. Moreover, they showed autistic-like behaviors in both of early and adult stages, decreased sociability in pup USV calling and adult social interaction, and adult repetitive grooming. To investigate pup stage transcriptomic changes in Arid1b mutant mice, RNAseq analysis of whole brain from wild-type and Arid1b mutant mice at postnatal day 3 was done. Transcriptomic changes support these electrophysiological and behavioral deficits. Arid1b HT mice at postnatal day 3 showed alterations in genes implicated in synaptic functions and ASD.
2022-07-21 | GSE203214 | GEO
Project description:ARID1A, a subunit of the SWI/SNF chromatin remodeling complex, is frequently mutated in cancer. Deficiency in its homolog ARID1B is synthetically lethal with ARID1A mutation. However, the functional relationship between these homologs has not been explored. Here we use ATAC-seq, genome-wide histone modification mapping, and expression analysis to examine colorectal cancer cells lacking one or both ARID proteins. We find that ARID1A has a dominant role in maintaining chromatin accessibility at enhancers, while the contribution of ARID1B is evident only in the context of ARID1A mutation. Changes in accessibility are predictive of changes in expression and correlate with loss of H3K4me and H3K27ac marks, nucleosome spacing, and transcription factor binding, particularly at growth pathway genes including MET. We find that ARID1B knockdown in ARID1A mutant ovarian cancer cells causes similar loss of enhancer architecture, suggesting that this is a conserved function underlying the synthetic lethality between ARID1A and ARID1B.
2017-09-29 | GSE101974 | GEO
Project description:ARID1A, a subunit of the SWI/SNF chromatin remodeling complex, is frequently mutated in cancer. Deficiency in its homolog ARID1B is synthetically lethal with ARID1A mutation. However, the functional relationship between these homologs has not been explored. Here we use ATAC-seq, genome-wide histone modification mapping, and expression analysis to examine colorectal cancer cells lacking one or both ARID proteins. We find that ARID1A has a dominant role in maintaining chromatin accessibility at enhancers, while the contribution of ARID1B is evident only in the context of ARID1A mutation. Changes in accessibility are predictive of changes in expression and correlate with loss of H3K4me and H3K27ac marks, nucleosome spacing, and transcription factor binding, particularly at growth pathway genes including MET. We find that ARID1B knockdown in ARID1A mutant ovarian cancer cells causes similar loss of enhancer architecture, suggesting that this is a conserved function underlying the synthetic lethality between ARID1A and ARID1B.
2017-09-29 | GSE101966 | GEO
Project description:We used IMR90 ER:RAS cells infected with an empty vector or an shRNA for ARID1B and induced senescence by addition of 4OHT. 6 days later RNA was collected for gene expression analysis. With a functional screen we previously identified ARID1B as a new regulator of cellular senescence. By performing gene expression analysis we confirmed this finding and showed that knockdown of ARID1B prevents the expression of genes induced during senescence.
2016-11-12 | GSE75207 | GEO