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Viruses within animal genomes.

A De Brognier, L Willems

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    Summary
    This summary is machine-generated.

    Viruses and animals evolve together, with viral DNA integrated into genomes over time. While most ancient viral infections are harmless, new integrations pose risks and drive evolutionary changes.

    Keywords:
    AnimalGenomePersistance du virusVirologie

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    Area of Science:

    • Evolutionary biology
    • Virology
    • Genomics

    Background:

    • Viruses and hosts engage in co-evolutionary dynamics, seeking a balance for mutual survival.
    • Pathogenicity can threaten virus survival if a host reservoir is absent.
    • A substantial portion of animal genomes contains fossilized viral DNA from past infections.

    Purpose of the Study:

    • To explore the evolutionary impact of viral integration into animal genomes.
    • To understand the dual nature of spontaneous viral integration as both a risk and an evolutionary driver.

    Main Methods:

    • Analysis of existing genomic data to identify and study endogenous viral elements.
    • Comparative genomics to assess the evolutionary consequences of viral insertions.
    • Review of current literature on virus-host interactions and viral integration events.

    Main Results:

    • Most endogenous viruses are non-replicative and passively integrated into host genomes.
    • Endogenous viral elements have significantly influenced animal genome evolution, particularly in mammalian reproductive biology.
    • Spontaneous viral integrations continue to occur, presenting both challenges and opportunities for host evolution.

    Conclusions:

    • Endogenous viral elements are a significant component of animal genome evolution.
    • While often benign, viral integrations can pose risks but also facilitate host adaptation and diversification.