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.
journal_name
Stem Cell Resjournal_title
Stem cell researchauthors
Liu L,Mao SQ,Ray C,Zhang Y,Bell FT,Ng SF,Xu GL,Li Xdoi
10.1016/j.scr.2015.08.010subject
Has Abstractpub_date
2015-09-01 00:00:00pages
435-43issue
2eissn
1873-5061issn
1876-7753pii
S1873-5061(15)00113-0journal_volume
15pub_type
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