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Histone variant H3.3 orchestrates neural stem cell differentiation in the developing brain.

Wenlong Xia1,2, Jianwei Jiao2,3

  • 1School of Life Sciences, University of Science and Technology of China, Hefei 230026, China.

Cell Death and Differentiation
|May 20, 2017
PubMed
Summary

Histone variant H3.3 is essential for embryonic neural stem cell (NSC) proliferation and differentiation. It works with MOF to regulate H4K16ac and GLI1, crucial for brain development.

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Area of Science:

  • Neuroscience
  • Epigenetics
  • Developmental Biology

Background:

  • Neural stem cell (NSC) proliferation and differentiation are critical for embryonic brain development, with disruptions leading to disorders.
  • Epigenetic modifications, including histone variants, are key regulators of stem cell fate.
  • The specific role of histone variant H3.3 in embryonic NSCs was previously unclear.

Purpose of the Study:

  • To investigate the function of histone variant H3.3 in embryonic neural stem cells (NSCs).
  • To elucidate the molecular mechanisms by which H3.3 regulates NSC proliferation and differentiation.

Main Methods:

  • Utilized shRNA to suppress H3.3 expression in embryonic NSCs.
  • Analyzed NSC proliferation, differentiation markers (PAX6), and histone modifications (H4K16ac).
  • Investigated protein interactions (H3.3 and MOF) and gene expression (GLI1) using techniques like RNA-seq and overexpression studies.

Main Results:

  • H3.3 suppression reduced PAX6-positive NSC proliferation and promoted premature neuronal differentiation.
  • H3.3 knockdown led to decreased H4K16ac levels and impaired interaction with MOF, a H4K16 acetyltransferase.
  • H3.3 knockdown downregulated the transcriptional regulator GLI1, whose knockdown mimicked H3.3 knockdown phenotypes.
  • Overexpression of H3.3, MOF, or GLI1 rescued H3.3 knockdown-induced abnormalities.

Conclusions:

  • Histone variant H3.3 is intrinsically required for proper embryonic NSC proliferation and differentiation.
  • H3.3 collaborates with MOF to enhance H4K16ac levels and regulate GLI1 expression, thereby controlling neurogenesis.
  • These findings highlight H3.3 as a critical epigenetic regulator in embryonic brain development.