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Selective differences among translation termination codons.

P M Sharp1, M Bulmer

  • 1Department of Genetics, Trinity College, Dublin, Ireland.

Gene
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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The study examined stop codon usage in bacteria and yeast, finding a preference for UAA in genes with biased codon usage. This bias may be maintained by translational selection, possibly due to release factor availability or reduced readthrough.

Area of Science:

  • Molecular Biology
  • Genetics
  • Microbiology

Background:

  • Translation termination relies on specific stop codons.
  • Codon usage bias is a known phenomenon in gene expression.
  • Alternative stop codons (UAA, UAG, UGA) play a role in protein synthesis.

Purpose of the Study:

  • To investigate the frequency and patterns of alternative translation termination codon usage.
  • To determine if stop codon usage correlates with sense codon bias in different species.
  • To explore potential selective pressures maintaining stop codon usage bias.

Main Methods:

  • Analysis of gene sequences from Escherichia coli, Bacillus subtilis, and Saccharomyces cerevisiae.
  • Categorization of genes based on sense codon usage bias.

Related Experiment Videos

  • Quantification of the usage frequency of UAA, UAG, and UGA stop codons.

    • Main Results:

    • A strong preference for the UAA stop codon was observed in genes with highly biased sense codon usage across all studied species.
    • This UAA bias decreased in genes with lower sense codon bias, with a corresponding increase in UGA usage.
    • The observed patterns suggest a regulatory role for stop codon selection.

    Conclusions:

    • Translational selection likely maintains the observed bias in stop codon usage.
    • Factors such as release factor availability and reduced translational readthrough at UAA may contribute to this selection.
    • Stop codon usage is not random and is influenced by evolutionary pressures during translation.