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Genome Res. 2010 Apr;20(4):434-9. doi: 10.1101/gr.103101.109. Epub 2010 Mar 10.

Human aging-associated DNA hypermethylation occurs preferentially at bivalent chromatin domains.

Author information

  • 1Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, UK. v.rakyan@qmul.ac.uk

Abstract

There is a growing realization that some aging-associated phenotypes/diseases have an epigenetic basis. Here, we report the first genome-scale study of epigenomic dynamics during normal human aging. We identify aging-associated differentially methylated regions (aDMRs) in whole blood in a discovery cohort, and then replicate these aDMRs in sorted CD4(+) T-cells and CD14(+) monocytes in an independent cohort, suggesting that aDMRs occur in precursor haematopoietic cells. Further replication of the aDMRs in buccal cells, representing a tissue that originates from a different germ layer compared with blood, demonstrates that the aDMR signature is a multitissue phenomenon. Moreover, we demonstrate that aging-associated DNA hypermethylation occurs predominantly at bivalent chromatin domain promoters. This same category of promoters, associated with key developmental genes, is frequently hypermethylated in cancers and in vitro cell culture, pointing to a novel mechanistic link between aberrant hypermethylation in cancer, aging, and cell culture.

PMID:
20219945
[PubMed - indexed for MEDLINE]
PMCID:
PMC2847746
Free PMC Article

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