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Spen regulates X chromosome inactivation (RNAseq in NPC)

ABSTRACT: Spen regulates X chromosome inactivation (RNAseq in NPC)

PROVIDER: PRJNA544937 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR9129752_1.fastq.gz	Fastqsanger.gz
	SRR9129752_2.fastq.gz	Fastqsanger.gz
	SRR9129753_1.fastq.gz	Fastqsanger.gz
	SRR9129753_2.fastq.gz	Fastqsanger.gz
	SRR9129754_1.fastq.gz	Fastqsanger.gz

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Spen regulates X chromosome inactivation

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Spen regulates X chromosome inactivation (SPEN SPOC domain rescue)

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Spen regulates X chromosome inactivation (RNAseq in ESCs )

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Spen regulates X chromosome inactivation (CUT&RUN)

Project description:Spen regulates X chromosome inactivation (CUT&RUN)

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SPEN is a molecular integrator that bridges Xist with transcriptional and epigenetic control of X-chromosome inactivation

Project description:Xist represents a paradigm for long non-coding RNA function in epigenetic regulation, although how it mediates X-chromosome inactivation (XCI) remains largely unexplained. Multiple Xist-RNA binding proteins have recently been identified, including SPEN/SHARP, whose knockdown has been associated with deficient XCI at multiple loci. Here we demonstrate that SPEN is a key orchestrator of XCI in vivo and unravel its mechanism of action. We show that SPEN is essential for initiating gene silencing on the X chromosome in preimplantation mouse embryos and embryonic stem cells. On the other hand, SPEN is dispensable for maintenance of XCI in neural progenitor cells, although it significantly dampens expression of genes that escape from XCI. During initiation of XCI, we show by live-cell imaging and CUT&RUN approaches that SPEN is immediately recruited to the X chromosome upon Xist up-regulation, where it is targeted to enhancers and promoters of actively transcribed genes. SPEN rapidly disengages from chromatin once silencing is accomplished, implying a need for active transcription to tether it to chromatin. We define SPEN’s SPOC (SPEN paralog and ortholog C-terminal) domain as a major effector of SPEN’s gene silencing function, and show that artificial tethering of SPOC to Xist RNA is sufficient to mediate X-linked gene silencing. We identify SPOC’s protein partners which include NCOR/SMRT, the m6A RNA methylation machinery, the NuRD complex, RNA polymerase II and factors involved in regulation of transcription initiation and elongation. We propose that SPEN acts as a molecular integrator for initiation of XCI, bridging Xist RNA with the transcription machinery as well as nucleosome remodelers and histone deacetylases, at active enhancers and promoters.

2021-04-19 | PXD015699 | Pride

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