4.7 Article

Divergent Requirements for EZH1 in Heart Development Versus Regeneration

期刊

CIRCULATION RESEARCH
卷 121, 期 2, 页码 106-+

出版社

LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/CIRCRESAHA.117.311212

关键词

lysine; methylation; myocardium; regeneration; polycomb repressive complex 2

资金

  1. Peking-Tsinghua Center for Life Sciences, Peking University
  2. 1000 Youth Talents Program of China
  3. National Natural Science Foundation of China [31571487]
  4. National Heart Lung and Blood Institute [2UM1 HL098166, HL116461]
  5. American Heart Association

向作者/读者索取更多资源

Rationale: Polycomb repressive complex 2 is a major epigenetic repressor that deposits methylation on histone H3 on lysine 27 (H3K27me) and controls differentiation and function of many cells, including cardiac myocytes. EZH1 and EZH2 are 2 alternative catalytic subunits with partial functional redundancy. The relative roles of EZH1 and EZH2 in heart development and regeneration are unknown. Objective: We compared the roles of EZH1 versus EZH2 in heart development and neonatal heart regeneration. Methods and Results: Heart development was normal in Ezh1(-/-) (Ezh1 knockout) and Ezh2(f/f)::cTNT(-Cre) (Ezh2 knockout) embryos. Ablation of both genes in Ezh1(-/-)::Ezh2(f/f)::cTNT(-Cre) embryos caused lethal heart malformations, including hypertrabeculation, compact myocardial hypoplasia, and ventricular septal defect. Epigenome and transcriptome profiling showed that derepressed genes were upregulated in a manner consistent with total EZH dose. In neonatal heart regeneration, Ezh1 was required, but Ezh2 was dispensable. This finding was further supported by rescue experiments: cardiac myocyte-restricted re-expression of EZH1 but not EZH2 restored neonatal heart regeneration in Ezh1 knockout. In myocardial infarction performed outside of the neonatal regenerative window, EZH1 but not EZH2 likewise improved heart function and stimulated cardiac myocyte proliferation. Mechanistically, EZH1 occupied and activated genes related to cardiac growth. Conclusions: Our work unravels divergent mechanisms of EZH1 in heart development and regeneration, which will empower efforts to overcome epigenetic barriers to heart regeneration.

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