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Updated: May 30, 2025

Chromatin Immunoprecipitation from Human Embryonic Stem Cells
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Chromatin Immunoprecipitation from Human Embryonic Stem Cells

Published on: July 22, 2008

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c-JUN: a chromatin repressor that limits mesoderm differentiation in human pluripotent stem cells

Ran Zhang1, Guihuan Li2, Qi Zhang2

  • 1State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Avenida da Universidade, Taipa, Macao, 999078, China.

Nucleic Acids Research
|January 29, 2025
PubMed

Insights

The transcription factor c-JUN limits mesoderm cell fate by regulating chromatin accessibility. This prevents over-specification of mesoderm during early human development.

Area of Science:

  • Developmental Biology
  • Epigenetics
  • Stem Cell Biology

Background:

  • Cell fate determination is crucial for embryonic development.
  • Chromatin regulation plays a key role in controlling cell differentiation.
  • The precise mechanisms by which transcription factors influence cell fate at the chromatin level are not fully understood.

Purpose of the Study:

  • To investigate the role of c-JUN in cell fate determination during early embryogenesis.
  • To elucidate the molecular mechanisms by which c-JUN regulates mesoderm specification.
  • To understand c-JUN's interaction with chromatin remodeling complexes.

Main Methods:

  • Human pluripotent stem cell differentiation assays.
  • Chromatin immunoprecipitation (ChIP) assays.
  • Gene expression analysis (e.g., qPCR, Western blotting).
  • CRISPR/Cas9 gene editing for gene knockout.
  • Pharmacological inhibition (JNK inhibitor).

Main Results:

  • c-JUN acts as a repressor of mesoderm cell fate specification as cells exit pluripotency.
  • c-JUN interacts with the MBD3-NuRD complex to maintain low chromatin accessibility at mesoderm-related genes.
  • c-JUN specifically inhibits the activation of key mesoderm factors like EOMES and GATA4.
  • Loss of c-JUN or MBD3 enhances mesoderm differentiation, while c-JUN overexpression promotes fibroblast-like differentiation.

Conclusions:

  • c-JUN functions as a critical chromatin regulator to restrict mesoderm cell fate.
  • The c-JUN/MBD3-NuRD complex pathway is essential for fine-tuning mesoderm development.
  • Targeting c-JUN could offer new strategies for controlling cell differentiation in regenerative medicine.

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