Gender Differences in Global but Not Targeted Demethylation in iPSC Reprogramming

Inês Milagre*, Thomas M. Stubbs, Michelle R. King, Julia Spindel, Fátima Santos, Felix Krueger, Martin Bachman, Anne Segonds-Pichon, Shankar Balasubramanian, Simon R. Andrews, Wendy Dean, Wolf Reik

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

Global DNA demethylation is an integral part of reprogramming processes in vivo and in vitro, but whether it occurs in the derivation of induced pluripotent stem cells (iPSCs) is not known. Here, we show that iPSC reprogramming involves both global and targeted demethylation, which are separable mechanistically and by their biological outcomes. Cells at intermediate-late stages of reprogramming undergo transient genome-wide demethylation, which is more pronounced in female cells. Global demethylation requires activation-induced cytidine deaminase (AID)-mediated downregulation of UHRF1 protein, and abolishing demethylation leaves thousands of hypermethylated regions in the iPSC genome. Independently of AID and global demethylation, regulatory regions, particularly ESC enhancers and super-enhancers, are specifically targeted for hypomethylation in association with transcription of the pluripotency network. Our results show that global and targeted DNA demethylation are conserved and distinct reprogramming processes, presumably because of their respective roles in epigenetic memory erasure and in the establishment of cell identity.

Original languageEnglish
Pages (from-to)1079-1089
Number of pages11
JournalCell Reports
Volume18
Issue number5
DOIs
Publication statusPublished - 31 Jan 2017
Externally publishedYes

Keywords

  • AID
  • DNA methylation
  • gender differences
  • iPSCs
  • reprogramming
  • UHRF1

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