Combined Deficiency of Tet1 and Tet2 Causes Epigenetic Abnormalities but Is Compatible with Postnatal Development

Meelad M. Dawlaty, Achim Breiling, Thuc Le, Günter Raddatz, M. Inmaculada Barrasa, Albert W. Cheng, Qing Gao, Benjamin E. Powell, Zhe Li, Mingjiang Xu, Kym F. Faull, Frank Lyko, Rudolf Jaenisch

Research output: Contribution to journalArticlepeer-review

356 Scopus citations


Tet enzymes (Tet1/2/3) convert 5-methylcytosine (5mC) to 5-hydroxymethylcytosine (5hmC) in various embryonic and adult tissues. Mice mutant for either Tet1 or Tet2 are viable, raising the question of whether these enzymes have overlapping roles in development. Here we have generated Tet1 and Tet2 double-knockout (DKO) embryonic stem cells (ESCs) and mice. DKO ESCs remained pluripotent but were depleted of 5hmC and caused developmental defects in chimeric embryos. While a fraction of double-mutant embryos exhibited midgestation abnormalities with perinatal lethality, viable and overtly normal Tet1/Tet2-deficient mice were also obtained. DKO mice had reduced 5hmC and increased 5mC levels and abnormal methylation at various imprinted loci. Nevertheless, animals of both sexes were fertile, with females having smaller ovaries and reduced fertility. Our data show that loss of both enzymes is compatible with development but promotes hypermethylation and compromises imprinting. The data also suggest a significant contribution of Tet3 to hydroxylation of 5mC during development.

Original languageEnglish (US)
Pages (from-to)310-323
Number of pages14
JournalDevelopmental cell
Issue number3
StatePublished - Feb 11 2013
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • General Biochemistry, Genetics and Molecular Biology
  • Developmental Biology
  • Cell Biology


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