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Related Experiment Videos

Myostatin rapid sequence evolution in ruminants predates domestication.

Asa Tellgren1, Ann-Charlotte Berglund, Peter Savolainen

  • 1Computational Biology Unit, Bergen Centre for Computational Science, University of Bergen, 5020 Bergen, Norway.

Molecular Phylogenetics and Evolution
|November 4, 2004
PubMed
Summary
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Positive selection may have driven changes in myostatin (Growth Differentiation Factor 8) evolution in ruminants. This genetic pressure, occurring around 23 million years ago, likely influenced skeletal muscle mass development.

Area of Science:

  • Evolutionary biology
  • Genomics
  • Mammalian genetics

Background:

  • Myostatin (Growth Differentiation Factor 8) is a key negative regulator of skeletal muscle growth.
  • The myostatin gene is associated with the 'double muscling' phenotype observed in certain cattle and mouse breeds.
  • Understanding myostatin's evolutionary trajectory can provide insights into muscle development regulation.

Purpose of the Study:

  • To systematically analyze the evolutionary history of the myostatin gene in various ruminant species.
  • To investigate potential selective pressures acting on myostatin during ruminant diversification.

Main Methods:

  • Sequencing of the myostatin coding sequence from seven ruminant species: duiker, eland, gaur, ibex, impala, pronghorn, and tahr.
  • Phylogenetic analysis of the obtained sequences.

Related Experiment Videos

  • Calculation of nonsynonymous to synonymous nucleotide substitution rate ratios (Ka/Ks) to detect positive selection.

    • Main Results:

    • Sequence data for myostatin were successfully generated for the selected ruminant species.
    • Analysis of Ka/Ks ratios suggests positive selection on the myostatin gene during the divergence of Bovinae and Antilopinae.
    • This period of selection, beginning approximately 23 million years ago, accounts for significant sequence divergence in myostatin between these groups.

    Conclusions:

    • The myostatin gene has experienced periods of positive selection in ruminant evolution.
    • These selective pressures may be linked to adaptive changes in skeletal muscle mass during ruminant diversification.
    • Further research can explore the functional consequences of these evolutionary changes on muscle development.