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DNA methylation maintains integrity of higher order genome architecture (Hi-C)

ABSTRACT: DNA methylation maintains integrity of higher order genome architecture (Hi-C)

PROVIDER: PRJNA663613 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12646280_1.fastq.gz	Fastqsanger.gz
	SRR12646280_2.fastq.gz	Fastqsanger.gz
	SRR12646281_1.fastq.gz	Fastqsanger.gz
	SRR12646281_2.fastq.gz	Fastqsanger.gz
	SRR12646282_1.fastq.gz	Fastqsanger.gz

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Project description:DNA replication timing and 3D chromatin organisation are associated with epigenomic changes across large domains during human differentiation and cancer progression. However, it is unclear if epigenome changes, in particular cancer-associated DNA hypomethylation, is a consequence or cause of changes observed in higher order genome architecture. Here, we compare replication timing profiles and three dimensional (3D) genome organisation, using Hi-C and single cell Repli-Seq in the DNMT1 and DNMT3B DNA methyltransferases double knockout hypomethylated DKO1 colorectal cancer cell line and its parental HCT116 cell line. We find that the hypomethylated cells show a profound loss of replication timing precision, gain of single cell replication timing heterogeneity and loss of chromatin conformation integrity. Discrete regions, that undergo a large change in replication timing in the hypomethylated cells, are associated with a loss of allelic replication timing and shrinking of late replicating Partially Methylated Domain (PMD) boundaries. In contrast, conservation of replication timing after DNA methylation depletion at PMDs is associated with the formation of new H3K9me3/H3K4me3 bivalent domains which may serve to prevent ectopic transcription and maintain cell viability. Together our results show that a loss of global methylation, a common hallmark of cancer, directly impacts on the precision of replication timing and contribute to deregulation of the 3D chromatin architecture.

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The nuclear matrix protein MATR3 maintains higher-order chromatin architecture II [Hi-C]

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