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KDM4A regulates myogenesis by demethylating H3K9me3 of myogenic regulatory factors

Qi Zhu1, Feng Liang1, Shufang Cai1

  • 1State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, North Third Road, Higher Education Mega Center, 510006, Guangzhou, Guangdong, China.

Cell Death & Disease
|May 20, 2021
PubMed

Insights

Histone lysine demethylase 4A (KDM4A) is vital for skeletal muscle development and regeneration. Its absence impairs muscle formation, satellite cell function, and myogenesis by affecting key gene regulation.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Muscle Physiology

Background:

  • Histone lysine demethylase 4A (KDM4A) is implicated in cell proliferation, differentiation, development, and tumorigenesis.
  • The specific role of KDM4A in skeletal muscle development and regeneration remains largely unexplored.

Purpose of the Study:

  • To investigate the function of KDM4A in skeletal muscle development and regeneration.
  • To elucidate the molecular mechanisms by which KDM4A regulates myogenesis.

Main Methods:

  • Conditional ablation of KDM4A in skeletal muscle and satellite cells.
  • In vitro studies involving KDM4A-deficient myoblasts.
  • Chromatin immunoprecipitation (ChIP) assays.
  • Analysis of cell proliferation and differentiation markers (e.g., P21, Cyclin D1).

Main Results:

  • Conditional KDM4A ablation impaired embryonic and postnatal muscle formation.
  • Loss of KDM4A in satellite cells resulted in defective muscle regeneration, proliferation, and differentiation.
  • KDM4A promotes myogenesis by demethylating H3K9me3 at myogenic gene loci (MyoD, MyoG, Myf5).
  • KDM4A deficiency in myoblasts inhibited differentiation, increased H3K9me3 levels, enhanced P21 expression, and decreased Cyclin D1 expression.

Conclusions:

  • KDM4A is a critical regulator of skeletal muscle development and regeneration.
  • KDM4A orchestrates myogenic cell proliferation and differentiation through epigenetic modifications.

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