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Coordinated cardiomyocyte growth, differentiation, and morphogenesis are essential for heart formation. We demonstrate that the bHLH transcription factors Hand1 and Hand2 play critical regulatory roles for left ventricle (LV) cardiomyocyte proliferation and morphogenesis. Using an LV-specific  Cre  allele ( Hand1   LV   -Cre ), we ablate  Hand1 -lineage cardiomyocytes, revealing that DTA-mediated cardiomyocyte death results in a hypoplastic LV by E10.5. Once  Hand1 -linage cells are removed from the LV, and  Hand1  expression is switched off, embryonic hearts recover by E16.5. In contrast, conditional LV loss-of-function of both  Hand1  and  Hand2  results in aberrant trabeculation and thickened compact zone myocardium resulting from enhanced proliferation and a breakdown of compact zone/trabecular/ventricular septal identity. Surviving  Hand1 ; Hand2  mutants display diminished cardiac function that is rescued by concurrent ablation of  Hand -null cardiomyocytes. Collectively, we conclude that, within a mixed cardiomyocyte population, removal of defective myocardium and replacement with healthy endogenous cardiomyocytes may provide an effective strategy for cardiac repair.

Hand factor ablation causes defective left ventricular chamber development and compromised adult cardiac function