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Sequence evolution of Drosophila mitochondrial DNA.

D R Wolstenholme, D O Clary

    Genetics
    |April 1, 1985
    PubMed
    Summary

    Comparing mitochondrial DNA (mtDNA) sequences of Drosophila species reveals distinct substitution patterns. Drosophila mtDNA shows equal transitions and transversions, unlike mammals, and suggests non-neutral evolution at codon third positions.

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    Area of Science:

    • Molecular Evolution
    • Genomics
    • Comparative Genomics

    Background:

    • Mitochondrial DNA (mtDNA) sequences evolve rapidly and are useful for phylogenetic studies.
    • Previous studies on mammalian mtDNA revealed a high rate of transitions over transversions and near-neutral evolution at silent sites.

    Purpose of the Study:

    • To compare nucleotide sequences of homologous mtDNA segments between Drosophila yakuba and Drosophila melanogaster.
    • To investigate substitution patterns, including transitions, transversions, and codon usage bias, in Drosophila mtDNA protein genes.
    • To infer aspects of the Drosophila mitochondrial genetic code.

    Main Methods:

    • Comparative analysis of nucleotide sequences from protein and tRNA genes in the mitochondrial genomes of D. yakuba and D. melanogaster.
    • Calculation of substitution frequencies (transitions vs. transversions) and analysis of codon usage bias at the third codon position.
    • Examination of specific codon interchanges (e.g., AGA/AGT) to infer genetic code assignments.

    Main Results:

    • Overall substitution frequency of 7.2% between the compared Drosophila mtDNA protein genes.
    • Most substitutions (86%) were silent, not altering amino acid sequences.
    • Drosophila mtDNA exhibited an approximately equal frequency of transitions and transversions, contrasting with mammals.
    • Non-neutral evolution was suggested by biased C->T substitutions at the third codon position in two-codon families.
    • Transversions predominated over transitions in four-codon families, with A->T substitutions being frequent.
    • A high proportion (94%) of codons ended in A or T, potentially influenced by mutation bias or selection.

    Conclusions:

    • Drosophila mtDNA exhibits unique substitution patterns compared to mammalian mtDNA, particularly regarding transitions and transversions.
    • Evidence suggests that silent substitutions in Drosophila mtDNA are not entirely neutral, with selection potentially acting on third codon positions.
    • The analysis supports the assignment of serine to the AGA codon in the Drosophila mitochondrial genetic code.

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