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Updated: May 30, 2025
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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
Summary
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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