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RNA-seq analysis of peripheral nerve with conditional knockout of H3K27 demethylases.

ABSTRACT: RNA-seq analysis of peripheral nerve with conditional knockout of H3K27 demethylases.

PROVIDER: PRJNA741269 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR14908017.fastq.gz	Fastqsanger.gz
	SRR14908018.fastq.gz	Fastqsanger.gz
	SRR14908019.fastq.gz	Fastqsanger.gz
	SRR14908020.fastq.gz	Fastqsanger.gz
	SRR14908021.fastq.gz	Fastqsanger.gz

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RNA-seq analysis of peripheral nerve with conditional knockout of H3K27 demethylases.

Project description:The goal of the experiment was to determine the role of H3 emethylases in the nerve injury response in peripheral nerve. A Schwann cell specific knockout of the H3K27 demethylases (Jmjd3 and Utx) was generated to compare with wild type mice in sham and injured mice at 1d and 7d timepoints after nerve injury.

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Project description:The induction of nerve injury response genes in Schwann cells depends on both transcriptional and epigenomic reprogramming. The nerve injury response program is regulated by the repressive histone mark H3K27 trimethylation (H3K27me3), deposited by Polycomb repressive complex 2 (PRC2). Loss of PRC2 function leads to early and augmented induction of the injury response gene network in peripheral nerves, suggesting H3K27 demethylases are required for derepression of Polycomb-regulated nerve injury genes. To determine the function of H3K27 demethylases in nerve injury, we generated Schwann cell-specific knockouts of H3K27 demethylase Kdm6b and double knockouts of Kdm6b/Kdm6a (encoding JMJD3 and UTX). We found that H3K27 demethylases are largely dispensable for Schwann cell development and myelination. In testing the function of H3K27 demethylases after injury, we found early induction of some nerve injury genes was diminished compared with control, but most injury genes were largely unaffected at 1 and 7 days post injury. Although it was proposed that H3K27 demethylases are required to activate expression of the cyclin-dependent kinase inhibitor Cdkn2a in response to injury, Schwann cell-specific deletion of H3K27 demethylases affected neither the expression of this gene nor Schwann cell proliferation after nerve injury. To further characterize the regulation of nerve injury response genes, we found that injury genes are associated with repressive histone H2AK119 ubiquitination catalyzed by PRC1, which declines after injury. Overall, our results indicate H3K27 demethylation is not required for induction of injury response genes and that other mechanisms likely are involved in activating Polycomb-repressed injury genes in peripheral nerve.

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