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Nucleosome eviction along with H3K9ac deposition enhances Sox2 binding during human neuroectodermal commitment
Yanhua Du1,2, Zhenping Liu2, Xinkai Cao2
1Institute of Translational Research, Tongji Hospital, Tongji University, Shanghai 200065, China.
Cell Death and Differentiation
|May 6, 2017
Summary
Chromatin remodeling epigenetically regulates human neuroectodermal cell differentiation. Key histone modifications like H3K9ac and H2A.Z facilitate neuroectodermal gene activation while repressing pluripotency genes, crucial for neural development.
Area of Science:
- Epigenetics
- Developmental Biology
- Stem Cell Biology
Background:
- Neuroectoderm is a critical neural precursor cell type.
- Epigenetic regulation and chromatin remodeling during human neuroectodermal cell (hNEC) differentiation from human embryonic stem cells (hESCs) are not well understood.
Purpose of the Study:
- To investigate the role of chromatin remodeling and epigenetic modifications in hNEC differentiation from hESCs.
- To elucidate the regulatory mechanisms governing gene expression changes during this process.
Main Methods:
- Directed differentiation of hESCs into hNECs.
- Chromatin immunoprecipitation (ChIP) assays to determine chromatin states (H2A.Z, H3K9ac, H3K27me3).
- Analysis of gene expression changes.
- Knockdown of the acetyltransferase Kat2b.
Main Results:
- Nucleosome depletion mediated by H2A.Z opens chromatin and upregulates neuroectodermal genes.
- Increased H3K9ac and decreased H3K27me3 activate neuroectodermal genes, while the reverse represses pluripotency genes.
- H3K9ac facilitates Sox2 binding, and Kat2b knockdown impairs this binding and blocks differentiation.
Conclusions:
- A hierarchy of epigenetic regulation, involving chromatin remodeling and specific histone modifications, governs hNEC differentiation.
- Histone modifications like H3K9ac are essential for activating neuroectodermal genes and repressing pluripotency genes.
- Kat2b and Sox2 play critical roles in this epigenetic regulatory network during neural differentiation.
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