Epigenetic regulation in pluripotent stem cells: a key to breaking the epigenetic barrier

Philos Trans R Soc Lond B Biol Sci. 2013 Jan 5;368(1609):20120292. doi: 10.1098/rstb.2012.0292.

Abstract

The differentiation and reprogramming of cells are accompanied by drastic changes in the epigenetic profiles of cells. Waddington's classical model clearly describes how differentiating cells acquire their cell identity as the developmental potential of an individual cell population declines towards the terminally differentiated state. The recent discovery of induced pluripotent stem cells as well as of somatic cell nuclear transfer provided evidence that the process of differentiation can be reversed. The identity of somatic cells is strictly protected by an epigenetic barrier, and these cells acquire pluripotency by breaking the epigenetic barrier by reprogramming factors such as Oct3/4, Sox2, Klf4, Myc and LIN28. This review covers the current understanding of the spatio-temporal regulation of epigenetics in pluripotent and differentiated cells, and discusses how cells determine their identity and overcome the epigenetic barrier during the reprogramming process.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Acetylation
  • Animals
  • Cell Differentiation*
  • Cellular Reprogramming
  • Chromatin Assembly and Disassembly
  • CpG Islands
  • DNA Methylation
  • Embryonic Development
  • Epigenesis, Genetic*
  • Histones / genetics
  • Histones / metabolism
  • Humans
  • Mice
  • Octamer Transcription Factor-3 / genetics
  • Octamer Transcription Factor-3 / metabolism
  • Pluripotent Stem Cells / cytology*
  • Pluripotent Stem Cells / metabolism
  • RNA, Untranslated / genetics
  • RNA, Untranslated / metabolism

Substances

  • Histones
  • Octamer Transcription Factor-3
  • Pou5f1 protein, mouse
  • RNA, Untranslated