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| Status |
Public on Sep 21, 2021 |
| Title |
DNA methylation maintains integrity of higher order genome architecture (Repli-Seq) |
| Organism |
Homo sapiens |
| Experiment type |
Other
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| Summary |
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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| Overall design |
Repli-Seq, single cell Repli-Seq, Hi-C, WGBS and Nanopore sequencing was conducted in HCT116 human colorectal cancer cell line and the same cell line with knockout of DNMT1 and DNMT3B (DKO1) (Rhee et al. 2002).
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| Contributor(s) |
Du Q, Clark SJ |
| Citation(s) |
34551299 |
| |
| Submission date |
Sep 15, 2020 |
| Last update date |
Dec 26, 2021 |
| Contact name |
Qian Du |
| E-mail(s) |
q.du@garvan.org.au
|
| Organization name |
Garvan Institute of Medical Research
|
| Street address |
384 Victoria St
|
| City |
Darlinghurst |
| State/province |
NSW |
| ZIP/Postal code |
2010 |
| Country |
Australia |
| |
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| Platforms (1) |
| GPL16791 |
Illumina HiSeq 2500 (Homo sapiens) |
|
| Samples (24)
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| This SubSeries is part of SuperSeries: |
| GSE158011 |
DNA methylation maintains integrity of higher order genome architecture |
|
| Relations |
| BioProject |
PRJNA663618 |
| SRA |
SRP282491 |
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