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Bacterial viruses, prophages, and plasmids, reconsidered.

S Sonea

    Annals of the New York Academy of Sciences
    |January 1, 1987
    PubMed
    Summary

    Prophages and plasmids created a vast gene pool in bacteria, driving evolution and shaping life. These genetic elements likely contributed to the origin of eukaryotic cell nuclei and diverse viruses.

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    Area of Science:

    • * Molecular Biology
    • * Evolutionary Biology
    • * Virology

    Background:

    • * Prophages and plasmids facilitate gene exchange in bacteria, creating a rich genetic resource.
    • * This genetic exchange has been fundamental to bacterial evolution and the development of life.
    • * The historical discovery order of viruses before their ancestors (prophages, plasmids) caused classification confusion.

    Purpose of the Study:

    • * To explore the profound impact of prophages and plasmids on bacterial evolution.
    • * To investigate the role of these genetic elements in the origin of eukaryotic cell nuclei.
    • * To trace the evolutionary origins of various viruses from bacterial genetic elements.

    Main Methods:

    • * Comparative genomics analysis (implied).
    • * Evolutionary history reconstruction (implied).
    • * Literature review of viral and bacterial genetics.

    Main Results:

    • * Prophages and plasmids act as a shared gene bank, driving bacterial innovation.
    • * These elements likely contributed to the formation of the eukaryotic nucleus from an endosymbiotic ancestor.
    • * Many eukaryotic viruses, including DNA and RNA viruses, appear to have evolved from prophages and plasmids.

    Conclusions:

    • * Prophages and plasmids are crucial drivers of bacterial evolution and genetic diversity.
    • * Their ancient role extends to the origin of eukaryotic cellular structures and viral lineages.
    • * Understanding these mobile genetic elements is key to deciphering early life and viral evolution.

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