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Amphioxus and tunicates as evolutionary model systems.

Michael Schubert1, Hector Escriva, José Xavier-Neto

  • 1Laboratoire de Biologie Moléculaire de la Cellule, CNRS-UMR5161, INRA LA 1237, IFR 128 BioSciences Lyon-Gerland, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, 69364 Lyon Cedex 07, France.

Trends in Ecology & Evolution
|May 16, 2006
PubMed
Summary
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The origin of vertebrates likely involved an invertebrate chordate ancestor. Recent evolutionary biology studies suggest tunicates and cephalochordates may have different ancestral positions than previously thought.

Area of Science:

  • Evolutionary Biology
  • Zoology
  • Phylogenetics

Background:

  • The origin of vertebrates from invertebrate ancestors is a key question in evolutionary biology.
  • Invertebrate chordates, including cephalochordates and tunicates, are considered proximate ancestors of vertebrates.
  • The traditional view placed tunicates as the sister group to cephalochordates and vertebrates.

Purpose of the Study:

  • To re-evaluate the evolutionary positions of tunicates and cephalochordates within the phylum Chordata.
  • To discuss the implications of revised phylogenetic placements on understanding vertebrate origins.
  • To compare cephalochordates and tunicates as model organisms for studying vertebrate origins.

Main Methods:

  • Review of existing phylogenetic studies and evolutionary data.

Related Experiment Videos

  • Comparative analysis of cephalochordate and tunicate characteristics.
  • Discussion of potential impacts on evolutionary models.

    • Main Results:

    • Recent studies challenge the established view of tunicate and cephalochordate evolutionary relationships.
    • A reversed phylogenetic position for tunicates and cephalochordates is proposed.
    • The study considers the consequences of this potential phylogenetic shift.

    Conclusions:

    • The evolutionary placement of tunicates and cephalochordates significantly impacts models of vertebrate origins.
    • Both cephalochordates and tunicates offer unique advantages and disadvantages as model systems.
    • Further research is needed to definitively resolve the phylogenetic relationships and inform vertebrate origin hypotheses.