Journal of Molecular Evolution

, Volume 51, Issue 4, pp 378–381

The Comparison of β-Thymosin Homologues Among Metazoa Supports an Arthropod-Nematode Clade

  • Michaël  Manuel
  • Michael  Kruse
  • Werner E.G.  Müller
  • Yannick  Le Parco

Abstract.

The definition of an Ecdysozoa clade among the protostomians, including all phyla with a regularly molted α-chitin-rich cuticle, has been one of the most provocative hypotheses to arise from recent investigations on animal phylogeny. Here we present evidence in favor of an arthropod-nematode clade, from the comparison of β-thymosin homologues among the Metazoa. Arthropods and nematodes share the absence of the highly conserved β-thymosin form found in all other documented bilaterian phyla as well as sponges, and the possession of a very unusual, internally triplicated homologue of the β-thymosin protein, unknown in other phyla. We argue that such discrete molecular character is phylogenetically very powerful and provides strong evidence for the monophyly of an arthropod-nematode clade.

Key words: Actin —β-Thymosin — Ecdysozoa — Evolution — Metazoa — Phylogeny — Porifera —Sycon 

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Copyright information

© Springer-Verlag New York Inc. 2000

Authors and Affiliations

  • Michaël  Manuel
    • 1
  • Michael  Kruse
    • 2
  • Werner E.G.  Müller
    • 3
  • Yannick  Le Parco
    • 1
  1. 1.Station Marine d'Endoume, Centre d'Océanologie de Marseille, Université de la Méditerranée, UMR CNRS 6540 DIMAR, rue de la Batterie des Lions, 13 007 Marseille, FranceFR
  2. 2.Max-Planck-Institut für Züchtungsforschung, Carl-von-Linné-Weg 10, 50829 Köln, GermanyDE
  3. 3.Institut für Physiologische Chemie, Abteilung Angewandte Molekularbiologie, Universität Mainz, Duesbergweg 6, D-55099 Mainz, GermanyDE

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