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Mus musculus

ABSTRACT: Capturing the onset of PRC2-mediated repressive domain formation [ChIP-Seq, 2]

PROVIDER: PRJNA400681 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR5990090.fastq.gz	Fastqsanger.gz
	SRR5990100.fastq.gz	Fastqsanger.gz
	SRR5990110.fastq.gz	Fastqsanger.gz
	SRR5990091.fastq.gz	Fastqsanger.gz
	SRR5990101.fastq.gz	Fastqsanger.gz

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Capturing the onset of PRC2-mediated repressive domain formation

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Capturing the onset of PRC2-mediated repressive domain formation[ChIP-Seq, 3]

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Deletion of RING1A/B and loss of H2AK119ub1 affects PRC2 occupancy and H3K27me3 genome-wide

Project description:The chromatin modifying activities inherent to polycomb repressive complexes PRC1 and PRC2 play an essential role in gene regulation, cellular differentiation, and development. However, the mechanisms by which these complexes recognize their target sites and function together to form repressive chromatin domains remain poorly understood. Recruitment of PRC1 to target sites has been proposed to occur through a hierarchical process, dependent on the prior nucleation of PRC2 and placement of H3K27me3. Here, using a de novo targeting assay in mouse embryonic stem cells we unexpectedly discover that PRC1-dependent H2AK119ub1 leads to the recruitment of PRC2 and H3K27me3 to effectively initiate a polycomb domain. Genetic ablation of catalytic subunit of the PRC1 complex (RINGA/B) and ChIP-seq analysis of PRC1 and PRC2 components confirmed genome-wide decreases in PRC2 occupancy and H3K27me3 levels at PRC target sites. This activity is restricted to variant PRC1 complexes and genetic ablation experiments reveal that targeting of the variant PCGF1/PRC1 complex by KDM2B to CpG islands is required for polycomb domain formation and normal development. Together these observations provide a surprising new PRC1-dependent logic for PRC2 occupancy and polycomb domain formation. RING1A-/-;RING1Bfl/fl ES cells were treated with 800M-BM-5M tamoxifen for 48hours and compared to untreated control cells by ChIP-seq for RING1B, SUZ12, EZH2 and H3K27me3.

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Bidirectional Introgression between Mus musculus domesticus and Mus spretus.

Project description:Introgressed variants from other species can be an important source of genetic variation because they may arise rapidly, can include multiple mutations on a single haplotype, and have often been pretested by selection in the species of origin. Although introgressed alleles are generally deleterious, several studies have reported introgression as the source of adaptive alleles-including the rodenticide-resistant variant of Vkorc1 that introgressed from Mus spretus into European populations of Mus musculus domesticus. Here, we conducted bidirectional genome scans to characterize introgressed regions into one wild population of M. spretus from Spain and three wild populations of M. m. domesticus from France, Germany, and Iran. Despite the fact that these species show considerable intrinsic postzygotic reproductive isolation, introgression was observed in all individuals, including in the M. musculus reference genome (GRCm38). Mus spretus individuals had a greater proportion of introgression compared with M. m. domesticus, and within M. m. domesticus, the proportion of introgression decreased with geographic distance from the area of sympatry. Introgression was observed on all autosomes for both species, but not on the X-chromosome in M. m. domesticus, consistent with known X-linked hybrid sterility and inviability genes that have been mapped to the M. spretus X-chromosome. Tract lengths were generally short with a few outliers of up to 2.7 Mb. Interestingly, the longest introgressed tracts were in olfactory receptor regions, and introgressed tracts were significantly enriched for olfactory receptor genes in both species, suggesting that introgression may be a source of functional novelty even between species with high barriers to gene flow.

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Project description:Our study defines nucleation and spreading regions for Polycomb repressive complex 2 (PRC2), demonstrating the principle of PRC2 domain formation in mammals. We elucidate the role of genome architecture in formation of these domains and identify JARID2 and MTF2 as being crucial for full recruitment of PRC2 to chromatin.

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Capturing the onset of PRC2-mediated repressive domain formation [ChIP-Seq, 2]

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