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Distinct roles of CKM-Mediator in controlling Polycomb-dependent chromosomal interactions and priming genes for induction

ABSTRACT: Distinct roles of CKM-Mediator in controlling Polycomb-dependent chromosomal interactions and priming genes for induction

PROVIDER: PRJNA771381 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR16345100_1.fastq.gz	Fastqsanger.gz
	SRR16345100_2.fastq.gz	Fastqsanger.gz
	SRR16345101_1.fastq.gz	Fastqsanger.gz
	SRR16345101_2.fastq.gz	Fastqsanger.gz
	SRR16345102_1.fastq.gz	Fastqsanger.gz

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Distinct roles for CDK-Mediator in controlling Polycomb-dependent chromosomal interactions and priming genes for induction (CaptureC)

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Distinct roles for CDK-Mediator in controlling Polycomb-dependent chromosomal interactions and priming genes for induction (CaptureC)

Project description:Precise control of gene expression is essential for normal development. This is thought to rely on mechanisms that enable communication between gene promoters and other regulatory elements. In embryonic stem cells (ESCs) the CDK-Mediator (CDK-MED) complex has been reported to topologically link gene regulatory elements to enable gene expression and also prime genes for induction during differentiation. Here we discover that CDK-MED contributes little to overall genome organisation in ESCs, but interestingly has a specific and essential role in controlling interactions between inactive gene regulatory elements bound by the Polycomb repressive complexes (PRCs). These interactions are facilitated by CDK-MED but rely on canonical PRC1. However, through separation of function experiments, we reveal that the collaboration between CDK-MED and cPRC1 in creating long-range interactions does not function to prime genes for induction during differentiation. Instead, we discover that priming relies on a topology-independent mechanism whereby the CDK module supports core Mediator engagement with gene promoters to support gene activation.

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A dual role for CDK-Mediator in controlling Polycomb-dependent topology and priming genes for induction [Hi-C]

Project description:A dual role for CDK-Mediator in controlling Polycomb-dependent topology and priming genes for induction [Hi-C]

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Distinct roles for CKM-Mediator in controlling Polycomb-dependent chromosomal interactions and priming genes for induction.

Project description:Precise control of gene expression underpins normal development. This relies on mechanisms that enable communication between gene promoters and other regulatory elements. In embryonic stem cells (ESCs), the cyclin-dependent kinase module Mediator complex (CKM-Mediator) has been reported to physically link gene regulatory elements to enable gene expression and also prime genes for induction during differentiation. Here, we show that CKM-Mediator contributes little to three-dimensional genome organization in ESCs, but it has a specific and essential role in controlling interactions between inactive gene regulatory elements bound by Polycomb repressive complexes (PRCs). These interactions are established by the canonical PRC1 (cPRC1) complex but rely on CKM-Mediator, which facilitates binding of cPRC1 to its target sites. Importantly, through separation-of-function experiments, we reveal that this collaboration between CKM-Mediator and cPRC1 in creating long-range interactions does not function to prime genes for induction during differentiation. Instead, we discover that priming relies on an interaction-independent mechanism whereby the CKM supports core Mediator engagement with gene promoters during differentiation to enable gene activation.

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Distinct roles of CKM-Mediator in controlling Polycomb-dependent chromosomal interactions and priming genes for induction

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

2022-05-23 | GSE185930 | GEO