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Serum response factor orchestrates nascent sarcomerogenesis and silences the biomineralization gene program in the

Zhiyv Niu1, Dinakar Iyer, Simon J Conway

  • 1Center for Cardiovascular Development, Section of Cardiovascular Sciences, Baylor College of Medicine, Houston, TX 77030, USA.

Proceedings of the National Academy of Sciences of the United States of America
|November 14, 2008
PubMed

Insights

Conditional knockout of serum response factor (SRF) in developing hearts prevents rhythmic beating and disrupts myofibril formation. SRF cofactor interactions are critical for sarcomere organization and cardiac development.

Area of Science:

  • Cardiovascular Biology
  • Molecular Cardiology
  • Developmental Biology

Background:

  • Serum response factor (SRF) is a crucial transcription factor in cardiac development.
  • Early cardiac defects can arise from the ablation of cardiac-enriched transcription factors.
  • Understanding SRF's role is key to deciphering cardiac formation processes.

Purpose of the Study:

  • To investigate the role of SRF in the development of rhythmic beating myocytes.
  • To determine the impact of SRF ablation on cardiac-specific gene expression.
  • To elucidate the importance of SRF cofactor interactions in sarcomere organization.

Main Methods:

  • Conditional knockout of SRF in heart-forming regions.
  • Analysis of cardiac gene and protein expression in Srf(CKO) mutants.
  • Viral rescue experiments using SRF point mutants in SRF-null ES cells.

Main Results:

  • SRF knockout blocked rhythmic beating and attenuated key cardiac genes (Hand1, Smyd1, Acta1, Acta2, Myl3, Myom1, KCNMB1).
  • Combinatorial cofactor interactions with SRF are essential for organized sarcomere formation.
  • SRF absence led to upregulation of GATA-6, BMP4, and periostin, with downregulation of miR1.

Conclusions:

  • SRF is indispensable for the initiation of cardiac myocyte beating and myofibril assembly.
  • SRF's function in sarcomere organization relies on its interactions with cofactors.
  • A regulatory network involving SRF, miR1, GATA-6, BMP4, and periostin controls cardiac development.

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