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Related Experiment Videos

Early-branching or fast-evolving eukaryotes? An answer based on slowly evolving positions.

H Philippe1, P Lopez, H Brinkmann

  • 1Phylogénie et Evolution Moléculaires (UPRES-A 8080), Université Paris-Sud, Orsay, France. herve.philippe@bc4.u-psud.fr

Proceedings. Biological Sciences
|July 21, 2000
PubMed
Summary

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Eukaryotic evolution models based on ribosomal RNA are challenged by new analysis. Fast-evolving lineages were previously misidentified, suggesting a rapid diversification of eukaryotes rather than a linear progression.

Area of Science:

  • Evolutionary Biology
  • Molecular Phylogenetics
  • Genomics

Background:

  • Current eukaryotic evolution models rely heavily on ribosomal RNA sequence comparisons.
  • These models suggest early-emerging, amitochondriate lineages represent stages in eukaryotic cell assembly.

Purpose of the Study:

  • To re-examine the established paradigm of eukaryotic evolution.
  • To investigate phylogenetic incongruences arising from molecular data.

Main Methods:

  • Application of a novel slow-fast method analyzing nucleotide substitution rates.
  • Comparative analysis of different molecular markers to assess phylogenetic stability.

Main Results:

  • Early-emerging lineages identified in ribosomal RNA trees are fast-evolving and subject to long branch attraction artefacts.

Related Experiment Videos

  • Phylogenetic incongruences are explained by the misplacement of fast-evolving groups.
  • Eukaryotic phylogeny is better represented by a multifurcation, indicating rapid diversification.

    • Conclusions:

    • The current paradigm of eukaryotic evolution requires significant revision.
    • The rapid diversification of extant eukaryotic lineages is supported, potentially by multiple cladogeneses.
    • Further resolution may come from analyzing rare evolutionary events like gene fusions or shared indels.