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Epigenetic dysregulation from chromosomal transit in micronuclei [RPE-1 CUT&RUN]

ABSTRACT: Epigenetic dysregulation from chromosomal transit in micronuclei [RPE-1 CUT&RUN]

PROVIDER: PRJNA883672 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR21684172_1.fastq.gz	Fastqsanger.gz
	SRR21684172_2.fastq.gz	Fastqsanger.gz
	SRR21684173_1.fastq.gz	Fastqsanger.gz
	SRR21684173_2.fastq.gz	Fastqsanger.gz
	SRR21684174_1.fastq.gz	Fastqsanger.gz

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Epigenetic dysregulation from chromosomal transit in micronuclei [RPE-1 RNA-Seq]

Project description:Chromosomal instability (CIN) and epigenetic reprograming are characteristic of advanced and metastatic human cancers, yet whether they are mechanistically linked is unknown. Here we show that missegregation of mitotic chromosomes, their sequestration in micronuclei, and subsequent micronuclear envelope rupture significantly disrupt normal histone post-translational modifications, a phenomenon conserved across humans and mice as well as cancer and non-transformed cells. Mislocalization of missegregating chromosomes during anaphase promotes loss of Histone H2B ubiquitination enrichment of histone H3 trimethylation, whereas micronuclear rupture engenders loss of histone H3 acetylation and histone H2A ubiquitination. Using fluorescence lifetime imaging, ATAC-see, and ATAC-seq we show that micronuclei exhibit profound differences in chromatin accessibility. Additionally, chromosomes that are reincorporated into the primary nucleus after transient encapsulation in micronuclei exhibit durable epigenetic dysregulation. Thus, in addition to genomic copy number alterations, CIN can serve as a vehicle for stochastic epigenetic reprogramming and heterogeneity in cancer.

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