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Related Experiment Videos

Eubacterial phylogeny based on translational apparatus proteins.

Céline Brochier1, Eric Bapteste, David Moreira

  • 1Phylogénie, Bioinformatique et Génome, UMR 7622 CNRS, Université Pierre et Marie Curie, 9, quai St Bernard, 75005 Paris, France.

Trends in Genetics : TIG
|December 26, 2001
PubMed
Summary

Lateral gene transfers are common in prokaryotes but hard to detect. Our study shows a core set of genes resist transfer, supporting a stable eubacterial phylogeny, consistent with ribosomal RNA trees.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Bioinformatics

Background:

  • Lateral gene transfer (LGT) is frequent in prokaryotes, complicating evolutionary studies.
  • The existence of a stable organismal phylogeny is questioned if all genes are equally affected by LGT.
  • The complexity hypothesis suggests a core set of genes, involved in many interactions, are resistant to LGT.

Purpose of the Study:

  • To test the complexity hypothesis regarding gene transfer resistance.
  • To investigate the impact of LGT on eubacterial phylogeny.
  • To develop a novel phylogenetic method for detecting gene transfers.

Main Methods:

  • Analysis of translation-related proteins across 45 eubacterial taxa.
  • Development of a new phylogenetic method to identify gene transfers.

Related Experiment Videos

  • Phylogenetic analysis comparing gene trees with ribosomal RNA (rRNA) trees.

    • Main Results:

    • Few of the studied translation genes provided evidence for lateral gene transfer.
    • Phylogenetic analysis using transfer-resistant genes yielded results consistent with the established rRNA tree.
    • The findings support the existence of a discernible eubacterial phylogeny.

    Conclusions:

    • A core set of genes, particularly those in translation, appear resistant to lateral gene transfer.
    • The complexity hypothesis is supported, suggesting a stable eubacterial phylogeny exists.
    • The developed phylogenetic method aids in distinguishing transferred genes from vertically inherited ones.