Induced DNA demethylation by targeting Ten-Eleven Translocation 2 to the human ICAM-1 promoter.

Abstract:

:Increasing evidence indicates that active DNA demethylation is involved in several processes in mammals, resulting in developmental stage-specificity and cell lineage-specificity. The recently discovered Ten-Eleven Translocation (TET) dioxygenases are accepted to be involved in DNA demethylation by initiating 5-mC oxidation. Aberrant DNA methylation profiles are associated with many diseases. For example in cancer, hypermethylation results in silencing of tumor suppressor genes. Such silenced genes can be re-expressed by epigenetic drugs, but this approach has genome-wide effects. In this study, fusions of designer DNA binding domains to TET dioxygenase family members (TET1, -2 or -3) were engineered to target epigenetically silenced genes (ICAM-1, EpCAM). The effects on targeted CpGs' methylation and on expression levels of the target genes were assessed. The results indicated demethylation of targeted CpG sites in both promoters for targeted TET2 and to a lesser extent for TET1, but not for TET3. Interestingly, we observed re-activation of transcription of ICAM-1. Thus, our work suggests that we provided a mechanism to induce targeted DNA demethylation, which facilitates re-activation of expression of the target genes. Furthermore, this Epigenetic Editing approach is a powerful tool to investigate functions of epigenetic writers and erasers and to elucidate consequences of epigenetic marks.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Chen H,Kazemier HG,de Groote ML,Ruiters MH,Xu GL,Rots MG

doi

10.1093/nar/gkt1019

subject

Has Abstract

pub_date

2014-02-01 00:00:00

pages

1563-74

issue

3

eissn

0305-1048

issn

1362-4962

pii

gkt1019

journal_volume

42

pub_type

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