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Broadly sampled multigene trees of eukaryotes.

Hwan Su Yoon1, Jessica Grant, Yonas I Tekle

  • 1Department of Biological Sciences, Smith College, Northampton, MA 01063, USA. hsyoon@bigelow.org

BMC Evolutionary Biology
|January 22, 2008
PubMed
Summary
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Phylogenetic analyses of eukaryotic diversity reveal limited support for proposed supergroups, with only Opisthokonta strongly supported. Increased taxon sampling is crucial for resolving the eukaryotic tree of life.

Area of Science:

  • Molecular Phylogenetics
  • Eukaryotic Diversity
  • Systematics

Background:

  • Understanding the eukaryotic tree of life is evolving with new molecular data.
  • Six major supergroups (Amoebozoa, Chromalveolata, Excavata, Opisthokonta, Plantae, Rhizaria) are proposed for eukaryotic classification.
  • Previous studies often used limited gene data or narrow taxon sampling.

Purpose of the Study:

  • To incorporate 72 new sequences (61 previously uncharacterized) into a multigene phylogenetic analysis.
  • To evaluate the support for the six putative eukaryotic supergroups using extensive taxon sampling and diverse phylogenetic methods.

Main Methods:

  • Phylogenetic analyses using two large, taxon-rich datasets.
  • Inclusion of 72 new sequences, significantly expanding previous sampling.

Related Experiment Videos

  • Application of various phylogenetic approaches to assess supergroup support.

    • Main Results:

    • Strong support was found for clades with known ultrastructural or molecular characters.
    • Limited to no support was observed for most proposed supergroups.
    • Only Opisthokonta received strong support; Amoebozoa showed moderate support; others lacked significant support.

    Conclusions:

    • Increased taxon sampling enhances the placement of eukaryotic lineages within robust clades.
    • The six-supergroup hypothesis for higher-level eukaryotic classification appears premature.
    • Future research requires even broader taxon and gene sampling to resolve deeper eukaryotic phylogenetic relationships.