The Whsc2/NelfA -dependent transcription complex is required for postnatal cardiac development and heart function

Area of Science:

• Cardiology
• Molecular Biology
• Genetics

Background:

• Heart failure stems from cardiac remodeling and dysfunction.
• Wolf-Hirschhorn Syndrome (WHS) involves genetic defects, including cardiac malformations.
• Negative elongation factor A (NELFA), a WHS candidate gene, regulates transcription.

Purpose of the Study:

• To investigate the role of NELFA in postnatal cardiac function.
• To characterize a mouse model with cardiomyocyte-specific NELFA deficiency.
• To elucidate the molecular mechanisms underlying NELFA-dependent cardiac development.

Main Methods:

• Generated a cardiomyocyte-specific Nelfa knockout (KO) mouse model.
• Analyzed cardiac function, mortality, and histopathology.
• Performed interactome and genomic occupancy studies.

Main Results:

• Nelfa KO mice developed spontaneous cardiomyopathy and died by 3 months.
• NelfA interacts with chromatin remodelers and pre-mRNA processing factors.
• Loss of NelfA disrupted NelfA-nucleated complexes at cardiac gene promoters, inhibiting gene expression.

Conclusions:

• Postnatal NelfA is essential for cardiac development and function.
• NelfA regulates the expression of critical cardiac genes via chromatin remodeling and transcription.
• NelfA deficiency leads to a cardiac crisis, resulting in dilated cardiomyopathy.