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Codon usage in muscle genes and liver genes.

K E Hastings, C P Emerson

    Journal of Molecular Evolution
    |January 1, 1983
    PubMed
    Summary

    Vertebrate genes share a common synonymous codon usage pattern, unaffected by species or tissue type. This consensus suggests natural selection, not random mutation, shapes codon selection across diverse genes.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Evolutionary Biology

    Background:

    • Synonymous codons offer alternative DNA sequences coding for the same amino acid.
    • Understanding codon usage patterns is crucial for gene expression and evolutionary studies.

    Purpose of the Study:

    • To investigate synonymous codon usage patterns across diverse vertebrate gene sets.
    • To determine if codon usage is tissue-specific or conserved.
    • To identify the evolutionary forces shaping codon usage in vertebrates.

    Main Methods:

    • Analysis of synonymous codon usage frequencies from cDNA clone sequences.
    • Comparison of gene sets from avian skeletal muscle and mammalian liver.
    • Statistical analysis to identify significant differences in codon usage patterns.

    Main Results:

    • Similar synonymous codon usage patterns were observed in diverse vertebrate gene sets.
    • No significant tissue-specific co-adaptation of codon usage and tRNA profiles was found.
    • A consensus codon usage pattern for vertebrate genes was identified, independent of taxonomic class and tissue.

    Conclusions:

    • Vertebrate codon usage exhibits a conserved pattern, largely independent of species and tissue.
    • The observed consensus pattern is indicative of natural selection acting on codon usage.
    • Codon usage in vertebrates is not solely determined by mutational equilibrium.

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