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Contextual constraints on synonymous codon choice.

D J Lipman, W J Wilbur

    Journal of Molecular Biology
    |January 25, 1983
    PubMed
    Summary
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    Statistical analysis reveals that synonymous codon usage bias varies across organisms. While mitochondrial codon choice may be explained by frequency, prokaryotes and eukaryotes show increasing dependence on codon context.

    Area of Science:

    • Molecular Biology
    • Bioinformatics
    • Genetics

    Background:

    • Synonymous codon usage bias is a known phenomenon in various organisms.
    • Previous studies by Fiers et al., Air et al., and Grantham et al. have observed and proposed explanations for this bias.

    Purpose of the Study:

    • To investigate the statistical constraints governing synonymous codon choice.
    • To evaluate different hypotheses explaining the observed bias in codon usage.

    Main Methods:

    • Determined the statistical dependence of the third base of a codon on its nearest neighbors.
    • Analyzed mitochondrial, prokaryotic, and eukaryotic coding sequences.
    • Compared sequence data against statistical models: random equiprobable selection, genome hypothesis, and codon frequency maintenance with positional variation.

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    Main Results:

    • Third base dependence on neighbors increases from mitochondria to prokaryotes to eukaryotes.
    • Random codon selection model is adequate for mitochondria but not prokaryotes/eukaryotes.
    • Grantham et al.'s genome hypothesis approximates mitochondrial sequences.
    • Codon frequency model is adequate for prokaryotes but not eukaryotes.

    Conclusions:

    • A frequency constraint model adequately explains mitochondrial codon usage.
    • Prokaryotic codon choice involves frequency constraints and context-dependent selection.
    • Eukaryotic codon usage necessitates constraints on codon context beyond simple frequency.