Tet enzymes, variants, and differential effects on function

Philippa Melamed, Yahav Yosefzon, Cfir David, Anna Tsukerman, Lilach Pnueli

Research output: Contribution to journalShort surveypeer-review

90 Scopus citations


Discovery of the ten-eleven translocation 1 (TET) methylcytosine dioxygenase family of enzymes, nearly 10 years ago, heralded a major breakthrough in understanding the epigenetic modifications of DNA. Initially described as catalyzing the oxidation of methyl cytosine (5mC) to hydroxymethyl cytosine (5hmC), it is now clear that these enzymes can also catalyze additional reactions leading to active DNA demethylation. The association of TET enzymes, as well as the 5hmC, with active regulatory regions of the genome has been studied extensively in embryonic stem cells, although these enzymes are expressed widely also in differentiated tissues. However, TET1 and TET3 are found as various isoforms, as a result of utilizing alternative regulatory regions in distinct tissues. Some of these isoforms, like TET2, lack the CXXC domain which probably has major implications on their recruitment to specific loci in the genome, while in certain contexts TET1 is seen paradoxically to repress transcription. In this review we bring together these novel aspects of the differential regulation of these Tet isoforms and the likely consequences on their activity.

Original languageEnglish
Article number22
JournalFrontiers in Cell and Developmental Biology
Issue numberMAR
StatePublished - 5 Mar 2018


  • 5hmC
  • 5mC
  • CXXC
  • DNA methylation
  • Hydroxymethylation
  • Isoform
  • Tet enzymes

ASJC Scopus subject areas

  • Developmental Biology
  • Cell Biology


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