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Phylogenomics reshuffles the eukaryotic supergroups.

Fabien Burki1, Kamran Shalchian-Tabrizi, Marianne Minge

  • 1Department of Zoology and Animal Biology, University of Geneva, Geneva, Switzerland. Fabien.Burki@zoo.unige.ch

Plos One
|August 30, 2007
PubMed
Summary
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New research reveals a robust evolutionary link between Rhizaria and chromalveolates, forming a new supergroup named SAR. This finding reshapes our understanding of eukaryotic diversity and plastid evolution.

Area of Science:

  • Evolutionary biology
  • Phylogenetics
  • Molecular evolution

Background:

  • Eukaryotic phylogeny remains challenging despite molecular data.
  • Current classification includes five or six supergroups, but their composition and relationships are debated.

Purpose of the Study:

  • To resolve phylogenetic relationships among eukaryotes.
  • To investigate the evolutionary placement of Rhizaria within eukaryotic supergroups.

Main Methods:

  • Sequencing expressed sequence tags (ESTs) from two Rhizaria species.
  • Analyzing a large dataset of 29,908 amino acid positions from 49 unicellular species across all eukaryotic supergroups.

Main Results:

  • Established a robust phylogenetic relationship between Rhizaria and the chromalveolate clades stramenopiles and alveolates.

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  • Confirmed evolutionary affinities between previously disparate eukaryotic supergroups.

    • Conclusions:

    • Proposed a new eukaryotic super-assemblage named 'SAR' (Stramenopiles+Alveolates+Rhizaria).
    • This finding challenges the single red algal origin hypothesis for chlorophyll-c plastids in chromalveolates.
    • Highlights the significant diversity within the newly defined SAR supergroup.