DNA methylation is associated with a large number of biological processes and mainly concerns the cytosine methylation at position 5 (5-mC). An active demethylation mechanism was highlighted in 2009 following the discovery that TET proteins were enzymes implicated in the hydroxylation of 5-mC to 5-hydroxymethylcytosine. Simultaneously, other studies showed frequent acquired TET2 mutations in hematological malignancies and have depicted their role in their pathogenesis. An entire field of research has developed rapidly showing that these proteins are involved in many biological processes.
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