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The Molecular Foundations of High Heart Rates: Sarcomeric Protein Adaptations.

William Joyce1

  • 1Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain.

Physiology (Bethesda, Md.)
|September 12, 2025
PubMed
Summary
This summary is machine-generated.

Mammalian heart rates vary widely. Gene duplication and splicing allow flexible adaptation of cardiac muscle proteins, enabling evolutionary innovation in heart function.

Keywords:
body masscontractile proteinsmyofilamentphylogenetics

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Area of Science:

  • Evolutionary biology
  • Molecular biology
  • Cardiovascular physiology

Background:

  • Mammalian heart rates exhibit over 100-fold variation.
  • Cardiac muscle contraction relies on conserved sarcomeric proteins.
  • Species-specific optimization of contractile proteins is crucial for diverse heart rates.

Purpose of the Study:

  • To investigate the evolutionary strategies mammals use to adapt cardiac contractile proteins.
  • To understand how gene regulation and protein evolution enable functional specialization in the heart.
  • To differentiate adaptive mechanisms in genes shared by cardiac and skeletal muscle versus heart-specific genes.

Main Methods:

  • Comparative genomics analysis of sarcomeric protein genes across mammalian species.
  • Examination of gene duplication (paralog switching) and alternative splicing mechanisms.
  • Analysis of evolutionary constraints and mutation accumulation in heart-specific versus shared muscle genes.

Main Results:

  • Genes shared by cardiac and skeletal muscle (e.g., myosin heavy chain, titin) utilize paralog switching and alternative splicing for adaptation.
  • These mechanisms allow flexible, reversible modulation of sarcomeric proteins without permanent sequence changes.
  • Heart-specific regulatory proteins (e.g., cardiac troponin I, cardiac myosin binding protein C) show greater evolutionary freedom, accumulating mutations for myocardial specialization.

Conclusions:

  • Paralog switching and alternative splicing are key evolutionary tools for adapting shared muscle proteins to diverse heart rates.
  • Heart-specific gene evolution allows for more specialized functional tuning of cardiac proteins.
  • These distinct strategies highlight the interplay between conserved functions and specialized adaptations in mammalian cardiac evolution.