Differential regulation of genomic imprinting by TET proteins in embryonic stem cells

Lizhi Liu, Shi Qing Mao, Chelsea Ray, Yu Zhang, Fong T. Bell, Sheau Fang Ng, Guo Liang Xu, Xiajun Li

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

TET proteins have been found to play an important role in active demethylation at CpG sites in mammals. There are some reports implicating their functions in removal of DNA methylation imprint at the imprinted regions in the germline. However, it is not well established whether TET proteins can also be involved in demethylation of DNA methylation imprint in embryonic stem (ES) cells. Here we report that loss of TET proteins caused a significant increase in DNA methylation at the Igf2-H19 imprinted region in ES cells. We also observed a variable increase in DNA methylation at the Peg1 imprinted region in the ES clones devoid of TET proteins, in particular in the differentiated ES cells. By contrast, we did not observe a significant increase of DNA methylation imprint at the Peg3, Snrpn and Dlk1-Dio3 imprinted regions in ES cells lacking TET proteins. Interestingly, loss of TET proteins did not result in a significant increase of DNA methylation imprint at the Igf2-H19 and Peg1 imprinted regions in the embryoid bodies (EB). Therefore, TET proteins seem to be differentially involved in maintaining DNA methylation imprint at a subset of imprinted regions in ES cells and EBs.

Original languageEnglish
Pages (from-to)435-443
Number of pages9
JournalStem Cell Research
Volume15
Issue number2
DOIs
StatePublished - 1 Sep 2015

Keywords

  • Bisulfite sequencing
  • COBRA analysis
  • DNA methylation
  • EB
  • ES cells
  • Genomic imprinting
  • TET

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