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How ancient are the tobamoviruses?

A Gibbs

    Intervirology
    |January 1, 1980
    PubMed
    Summary

    Comparing tobamovirus protein sequences reveals their evolutionary relationships and suggests these plant viruses are ancient, potentially as old as flowering plants. This analysis aids in understanding virus phylogeny and classification.

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    Area of Science:

    • Virology
    • Molecular Evolution
    • Bioinformatics

    Background:

    • Tobamoviruses are plant pathogens with diverse strains.
    • Understanding their evolutionary history is crucial for disease management and biological insights.

    Purpose of the Study:

    • To compare amino acid sequences of tobamovirus virion proteins.
    • To establish the phylogenetic relationships among tobamoviruses.
    • To correlate sequence data with serological and compositional differences for classification.

    Main Methods:

    • Comparative analysis of amino acid sequences from 7 tobamoviruses.
    • Phylogenetic analysis using sequence data to construct a dendrogram.
    • Correlation analysis between sequence differences, serological data, and amino acid composition.
    • Classification of 13 tobamoviruses based on amino acid composition.

    Main Results:

    • A single dendrogram unequivocally arranged the 7 tobamovirus protein sequences, likely reflecting their phylogeny.
    • Sequence divergence suggests tobamoviruses are ancient, potentially co-evolving with flowering plants.
    • Significant correlations were found between sequence differences, serological variations, and amino acid composition.

    Conclusions:

    • Amino acid sequence comparison is a reliable method for tobamovirus phylogeny.
    • The classification based on amino acid composition likely mirrors evolutionary relationships.
    • The study provides insights into the ancient origins and diversification of tobamoviruses.

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