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Amplification of myoadenylate deaminase during evolution. A comparative study

J P Raffin1, M T Thébault

  • 1CNRS-UPR 4601, Laboratoire de Physiologie Cellulaire, UFR Sciences et Techniques, Brest, France.

Comptes Rendus De L'Academie Des Sciences. Serie III, Sciences De La Vie
|May 1, 1994
PubMed
Summary

Myoadenylate deaminase activity varies across animal species. Genetic modifications in this enzyme likely occurred during early vertebrate evolution in both elasmobranch fishes and land vertebrates.

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Area of Science:

  • Biochemistry
  • Evolutionary Biology
  • Comparative Genomics

Background:

  • Myoadenylate deaminase (MAD) is a crucial enzyme in muscle energy metabolism.
  • Understanding the evolutionary history of MAD provides insights into vertebrate diversification.
  • Previous studies have focused on MAD in higher vertebrates, leaving gaps in comparative analysis.

Purpose of the Study:

  • To investigate myoadenylate deaminase activity across a broad spectrum of animal taxa.
  • To correlate observed MAD activity patterns with known evolutionary events in vertebrates.
  • To propose evolutionary pathways for the distinct MAD molecular forms found in different vertebrate lineages.

Main Methods:

  • Enzyme assays were employed to quantify myoadenylate deaminase activity.

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  • A diverse range of species were analyzed, encompassing invertebrates, cyclostomes, chondrosteans, teleosts, and mammals.
  • Results were interpreted in the context of established genetic events and phylogenetic relationships.

    • Main Results:

    • Significant variations in myoadenylate deaminase activity were detected across the studied animal groups.
    • The study identified distinct molecular forms of myoadenylate deaminase.
    • Enzyme activity levels correlated with evolutionary divergence points.

    Conclusions:

    • Myoadenylate deaminase activity patterns reflect deep evolutionary divergences.
    • Genetic modifications of the myoadenylate deaminase molecule likely occurred independently in at least two distinct lineages during early vertebrate evolution.
    • These modifications contributed to the emergence of specific MAD forms in rajiform elasmobranchs and land vertebrates.