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Patterns of ribosomal RNA evolution in salamanders.

A Larson1, A C Wilson

  • 1Department of Biochemistry, University of California, Berkeley.

Molecular Biology and Evolution
|March 1, 1989
PubMed
Summary

Ribosomal RNA (rRNA) sequence comparisons reveal salamander and amphibian evolutionary relationships. Divergent rRNA domains provide phylogenetic insights into ancient evolutionary events.

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Area of Science:

  • Molecular evolution
  • Phylogenetics
  • Genomics

Background:

  • Ribosomal RNA (rRNA) plays a crucial role in protein synthesis and is a valuable molecule for evolutionary studies.
  • Divergent domains within rRNA evolve at different rates compared to conserved regions, offering unique phylogenetic signals.
  • Understanding amphibian evolution requires robust phylogenetic frameworks.

Purpose of the Study:

  • To resolve phylogenetic relationships among salamander families and amphibian orders using rRNA sequence data.
  • To investigate the evolutionary dynamics of divergent rRNA domains (D7a, D7b, D2, D3, D8) and flanking conserved sequences.
  • To assess the utility of divergent rRNA domains for reconstructing deep evolutionary history.

Main Methods:

  • Comparative sequence analysis of four segments from the large subunit of ribosomal RNA.
  • Phylogenetic analysis incorporating divergent and conserved rRNA regions.
  • Examination of base substitution patterns (transitions vs. transversions) and length variation (insertions/deletions).

Main Results:

  • Phylogenetic analysis successfully resolved relationships among seven salamander families and three amphibian orders.
  • Divergent rRNA domains exhibited higher rates of base substitution and length variation than conserved regions.
  • However, divergent domains evolved slower than nuclear noncoding DNA and silent sites of structural genes.
  • Base substitutions showed a 2:1 transition:transversion ratio, with uneven site distribution but no base composition bias.
  • Length mutations were predominantly small deletions.

Conclusions:

  • Divergent rRNA domains are valuable sources of phylogenetic information for resolving amphibian relationships.
  • These domains are particularly useful for inferring evolutionary events approximately 100-200 million years ago.
  • The evolutionary rates and patterns observed in divergent domains provide insights into molecular evolution within the ribosome.

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