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Related Experiment Videos

Is there selection against wobble in codon-anticodon pairing?

W M Fitch

    Science (New York, N.Y.)
    |December 10, 1976
    PubMed
    Summary
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    MS2 phage RNA shows a bias for cytidine over uracil in codons needing a third-position pyrimidine. This preference may stem from selection against wobble pairing during transfer RNA and messenger RNA interactions.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Virology

    Background:

    • Codon usage bias is a key factor influencing gene expression and evolution.
    • The third position of codons often exhibits degeneracy, with varying nucleotide preferences.
    • RNA viruses, like MS2 phage, offer a model system to study genome composition and selection pressures.

    Purpose of the Study:

    • To investigate the nucleotide bias at the third position of codons in MS2 phage RNA.
    • To explore the potential role of tRNA-mRNA interactions, specifically wobble pairing, in shaping codon usage.
    • To determine if biases exist in fourfold degenerate codons regarding pyrimidine versus purine usage.

    Main Methods:

    • Bioinformatic analysis of the MS2 phage genome sequence.
    • Statistical examination of codon frequencies and nucleotide composition.

    Related Experiment Videos

  • Comparison of observed codon usage with expected frequencies under neutral evolution.

    • Main Results:

    • A significant bias favoring cytidine over uracil was observed in codons requiring a third-position pyrimidine.
    • In fourfold degenerate codons, a bias favoring pyrimidines over purines was detected.
    • The findings suggest selection may be acting against wobble pairing in MS2 phage.

    Conclusions:

    • The observed codon usage bias in MS2 phage RNA is likely shaped by selection pressures, potentially related to translation efficiency and accuracy.
    • Selection against wobble pairing could be a significant factor driving the preference for cytidine over uracil.
    • Understanding these biases provides insights into the evolutionary strategies of RNA viruses.