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PLoS One. 2008 Sep 29;3(9):e3294. doi: 10.1371/journal.pone.0003294.

Cancer genes hypermethylated in human embryonic stem cells.

Author information

1
Cancer Epigenetics Group, Spanish National Cancer Research Centre, CNIO, Madrid, Spain.

Abstract

Developmental genes are silenced in embryonic stem cells by a bivalent histone-based chromatin mark. It has been proposed that this mark also confers a predisposition to aberrant DNA promoter hypermethylation of tumor suppressor genes (TSGs) in cancer. We report here that silencing of a significant proportion of these TSGs in human embryonic and adult stem cells is associated with promoter DNA hypermethylation. Our results indicate a role for DNA methylation in the control of gene expression in human stem cells and suggest that, for genes repressed by promoter hypermethylation in stem cells in vivo, the aberrant process in cancer could be understood as a defect in establishing an unmethylated promoter during differentiation, rather than as an anomalous process of de novo hypermethylation.

PMID:
18820729
PMCID:
PMC2546447
DOI:
10.1371/journal.pone.0003294
[Indexed for MEDLINE]
Free PMC Article

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