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Chromatin Immunoprecipitation from Human Embryonic Stem Cells
10:36

Chromatin Immunoprecipitation from Human Embryonic Stem Cells

Published on: July 22, 2008

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Essential Role for Polycomb Group Protein Pcgf6 in Embryonic Stem Cell Maintenance and a Noncanonical Polycomb

Wukui Zhao1, Huan Tong1, Yikai Huang1

  • 1From the MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing Biomedical Research Institute, Nanjing University, Nanjing 210061, China.

The Journal of Biological Chemistry
|January 5, 2017
PubMed

Insights

Polycomb group RING finger protein 6 (Pcgf6) is crucial for embryonic stem cell self-renewal and differentiation. Pcgf6 protein is essential for recruiting the PRC1.6 complex to chromatin, independent of H2AK119ub1.

Area of Science:

  • Developmental Biology
  • Epigenetics
  • Stem Cell Biology

Background:

  • Polycomb group (PcG) proteins regulate gene expression during development.
  • Polycomb repressive complexes 1 (PRC1) are key epigenetic regulators, with emerging roles for noncanonical complexes.
  • The function of specific noncanonical PRC1 complexes in maintaining pluripotency remains unclear.

Purpose of the Study:

  • To investigate the role of Pcgf6 in mouse embryonic stem cell (ESC) self-renewal and differentiation.
  • To elucidate the mechanism by which Pcgf6 contributes to the function of noncanonical PRC1 complexes.

Main Methods:

  • CRISPR-Cas9 gene editing to create Pcgf6 knockout mouse ESCs.
  • Analysis of ESC self-renewal and differentiation capacity.
  • Chromatin immunoprecipitation to assess PRC1.6 binding to target genes.
  • Histone modification analysis (H2AK119ub1).

Main Results:

  • Pcgf6 null ESCs exhibit severe defects in self-renewal and differentiation.
  • Pcgf6 forms a noncanonical PRC1 complex, PRC1.6, regulating genes involved in differentiation and spermatogenesis.
  • Pcgf6 deletion significantly reduces PRC1.6 chromatin binding without affecting H2AK119ub1 levels.
  • Pcgf6 is essential for the chromatin recruitment of PRC1.6.

Conclusions:

  • Pcgf6 is indispensable for maintaining ESC pluripotency and proper differentiation.
  • Pcgf6 acts through the PRC1.6 complex to regulate specific gene sets.
  • The recruitment of PRC1.6 by Pcgf6 is independent of H2AK119ub1 modification, revealing a novel mechanism of chromatin assembly.

Keywords:
Polycombchromatinembryonic stem cellepigeneticstranscription regulation

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