Abstract
5'-hydroxymethylcytosine (5hmC) is a variant of the common covalent epigenetic modification of DNA 5'-methylcytosine (5mC). Although the presence of this modified base in mammalian DNA has been recognized for several decades, it has recently gained center stage as a suspected intermediate in enzymatic active demethylation of 5mC. The role of 5hmC remains elusive in spite of a large body of studies. It is proposed that 5hmC is a variant of the 5mC epigenetic signal and is involved in epigenetic regulation of gene function. Recent data support a role for 5hmC in the activation of lineage-specific enhancers.
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