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Cooperative interaction of Nkx2.5 and Mef2c transcription factors during heart development

Joshua W Vincentz1, Ralston M Barnes, Beth A Firulli

  • 1Riley Heart Research Center, Herman B Wells Center for Pediatric Research Division of Pediatrics Cardiology, Department of Anatomy, Indiana Medical School, Indianapolis, Indiana 46202-5225, USA.

Developmental Dynamics : an Official Publication of the American Association of Anatomists
|November 28, 2008
PubMed

Insights

Nkx2.5 and Mef2c physically interact and are essential for mammalian heart ventricle formation. Genetic disruption of both transcription factors leads to severe ventricular defects due to impaired cell differentiation.

Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Molecular Genetics

Background:

  • Mammalian heart development relies on complex transcription factor interactions.
  • Nkx2.5 and Mef2c are key regulators with overlapping functions in cardiac development.

Purpose of the Study:

  • To investigate the molecular and genetic interactions between Nkx2.5 and Mef2c.
  • To determine the role of Nkx2.5-Mef2c interaction in mammalian ventricle formation.

Main Methods:

  • Co-immunoprecipitation and mammalian two-hybrid assays to confirm direct interaction.
  • mRNA expression analysis for spatiotemporal coexpression.
  • Histological and molecular analyses of single and double knockout mouse models.

Main Results:

  • Nkx2.5 and Mef2c directly interact and are coexpressed in the developing heart.
  • Nkx2.5(-/-) and Mef2c(-/-) single mutants form ventricles, but double mutants do not.
  • Ventricular hypoplasia in double mutants results from defective ventricular cardiomyocyte differentiation.

Conclusions:

  • Physical, functional, and genetic interactions between Nkx2.5 and Mef2c are critical for mammalian ventricle development.
  • The Nkx2.5-Mef2c complex regulates ventricular cell differentiation, essential for proper heart formation.

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