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Related Experiment Videos

Evolution according to large ribosomal subunit RNA

P De Rijk1, Y Van de Peer, I Van den Broeck

  • 1Departement Biochemie, Universiteit Antwerpen (UIA), Belgium.

Journal of Molecular Evolution
|September 1, 1995
PubMed
Summary
This summary is machine-generated.

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Large subunit ribosomal RNA (LSU rRNA) is a superior molecule for constructing evolutionary trees, offering more stable topologies than small subunit rRNA (SSU rRNA) across diverse taxa.

Area of Science:

  • Molecular Evolution
  • Phylogenetics
  • Bioinformatics

Background:

  • Ribosomal RNA (rRNA) is a crucial molecule for understanding evolutionary relationships.
  • Both large subunit (LSU) and small subunit (SSU) rRNA sequences are widely used for phylogenetic analyses.
  • Previous studies have utilized rRNA sequences to infer evolutionary histories of life.

Purpose of the Study:

  • To compare the utility of LSU rRNA and SSU rRNA sequences in constructing robust evolutionary trees.
  • To assess the impact of dataset composition and distance correction methods on phylogenetic tree topology.
  • To evaluate the reliability of LSU rRNA for studying wide-ranging evolutionary relationships.

Main Methods:

  • Construction of evolutionary trees using distance methods from 225 complete LSU rRNA sequences.

Related Experiment Videos

  • Comparison with trees derived from sets of SSU rRNA sequences.
  • Analysis of tree topology stability using random sampling and different distance correction methods.

    • Main Results:

    • Trees from LSU rRNA and SSU rRNA showed similar topologies for shared species, particularly regarding major taxa divergence.
    • SSU rRNA-based trees exhibited significant topological variations based on species composition.
    • LSU rRNA-based trees demonstrated greater topological stability, with less impact from dataset variations.

    Conclusions:

    • LSU rRNA appears to be a more reliable molecule than SSU rRNA for inferring broad evolutionary relationships due to its higher topological stability.
    • Mitochondria consistently cluster as a monophyletic group with Proteobacteria.
    • Archaea generally show monophyletic behavior, albeit with low confidence in some analyses.