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Epigenetics of pluripotent cells.

S P Medvedev1, E A Pokushalov, S M Zakian

  • 1Institute of Cytology and Genetics, Siberian Branch, Russian Academy of Sciences, Prospekt Lavrentyeva, 10, Novosibirsk, Russia, 630090 ; Meshalkin Novosibirsk State Research Institute of Circulation Pathology, Rechkunovskaja Str., 15, Novosibirsk, Russia, 630055 ; Institute of Chemical Biology and Fundamental Medicine, Siberian Branch, Russian Academy of Sciences, Prospekt Lavrentyeva, 8, Novosibirsk, Russia, 630090.

Acta Naturae
|January 25, 2013
PubMed
Summary

Pluripotency relies on intricate genetic and epigenetic interactions, particularly involving key transcription factors like OCT4, SOX2, and NANOG, which shape chromatin structure in stem cells.

Keywords:
DNA methylationcovalent histone modificationsembryonic stem cellsinduced pluripotent stem cellspluripotency

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Area of Science:

  • Developmental Biology
  • Epigenetics
  • Stem Cell Biology

Background:

  • Pluripotency, the ability of a cell to differentiate into any cell type, is maintained by complex genetic and epigenetic regulatory systems.
  • Recent research highlights the intricate interplay between genetic factors (transcription factors, signaling pathways, microRNAs) and epigenetic machinery (chromatin structure modifiers).

Purpose of the Study:

  • To review the epigenetic features of embryonic stem cells (ESCs) and induced pluripotent stem cells (iPSCs).
  • To examine the interaction between pluripotency transcription factors and chromatin-modifying proteins.
  • To discuss epigenetic events during cellular reprogramming and the concept of epigenetic memory.

Main Methods:

  • Literature review focusing on genetic and epigenetic regulation of pluripotency.
  • Analysis of the roles of OCT4, SOX2, and NANOG in conjunction with Polycomb group proteins.
  • Consideration of X chromosome inactivation and reprogramming-associated epigenetic modifications.

Main Results:

  • The unique chromatin state of pluripotent cells arises from the interaction between genetic regulators and epigenetic modifiers.
  • Specific transcription factors (OCT4, SOX2, NANOG) are crucial in orchestrating chromatin structure and gene silencing.
  • Epigenetic reprogramming involves significant changes, with 'epigenetic memory' posing a challenge in induced pluripotency.

Conclusions:

  • Epigenetic mechanisms are fundamental to maintaining pluripotency and are tightly integrated with genetic regulatory networks.
  • Understanding these epigenetic dynamics is key to advancing stem cell research and therapeutic applications.
  • Further investigation into epigenetic memory is essential for efficient and faithful cellular reprogramming.