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Related Experiment Videos

Codon usage and tRNA content in unicellular and multicellular organisms.

T Ikemura1

  • 1Department of Biophysics, Faculty of Science, Kyoto University, Japan.

Molecular Biology and Evolution
|January 1, 1985
PubMed
Summary

Synonymous codon usage in organisms is linked to tRNA populations, influencing gene expression and evolutionary rates. This relationship, observed in bacteria and yeast, suggests conserved codon-choice patterns across evolution.

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genetics

Background:

  • Synonymous codon usage varies significantly across different organisms.
  • This variation is thought to be influenced by the availability of isoaccepting transfer RNA (tRNA) molecules.
  • Understanding these patterns provides insights into gene expression efficiency and evolutionary constraints.

Purpose of the Study:

  • To review synonymous codon usage in unicellular organisms.
  • To attribute differences in codon usage between Escherichia coli and Saccharomyces cerevisiae to tRNA populations.
  • To examine the evolutionary implications of codon usage and tRNA content.

Main Methods:

  • Comparative analysis of codon usage patterns in Escherichia coli and Saccharomyces cerevisiae.

Related Experiment Videos

  • Correlation analysis between codon usage and tRNA content in relation to gene protein production levels.
  • Examination of silent substitutions and tRNA populations in Enterobacteriaceae.
  • Review of codon-choice patterns in multicellular organisms, including vertebrates.

    • Main Results:

    • Differences in synonymous codon usage between Escherichia coli and Saccharomyces cerevisiae are strongly correlated with their respective isoaccepting tRNA populations.
    • A positive correlation exists between codon usage and tRNA content, influenced by gene protein production levels.
    • Evolutionary constraints imposed by tRNA content on codon usage decelerated silent substitution rates in Enterobacteriaceae.
    • Diversity in G+C percentage at the third codon position in vertebrate genes was discussed.

    Conclusions:

    • The actual populations of isoaccepting tRNAs are a primary determinant of synonymous codon usage differences in unicellular organisms.
    • Codon usage patterns appear to be evolutionarily conserved, with tRNA content acting as a decelerating force on silent substitution rates.
    • Further investigation into codon usage diversity in multicellular organisms is warranted.