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Related Experiment Videos

Circular and linear simian virus 40 DNAs differ in recombination.

D Dorsett, I Deichaite, E Winocour

    Molecular and Cellular Biology
    |April 1, 1985
    PubMed
    Summary

    Linear simian virus 40 (SV40) DNA enhances recombination with phi X174 DNA. This occurs via a rolling circle replication pathway, generating intermediates that promote genetic exchange.

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    Area of Science:

    • Molecular Biology
    • Virology
    • Genetics

    Background:

    • Simian virus 40 (SV40) is a DNA tumor virus used extensively in molecular biology research.
    • Recombination is a fundamental process in genetics, crucial for genetic diversity and DNA repair.
    • Understanding viral DNA replication and recombination mechanisms can provide insights into host-pathogen interactions.

    Purpose of the Study:

    • To investigate the role of linear SV40 DNA in enhancing recombination with another DNA molecule.
    • To identify the specific SV40 DNA sequences responsible for recombination enhancement.
    • To elucidate the mechanism by which linear SV40 DNA promotes recombination.

    Main Methods:

    • Transfection of monkey BSC-1 cells with circular SV40 and phi X174 RFI DNAs.
    • Addition of linear forms of SV40 DNA to transfection mixtures.
    • Measurement of SV40/phi X174 recombination frequency using infectious center in situ plaque hybridization.
    • Analysis of recombinant DNA structures.

    Main Results:

    • Linear SV40 DNA significantly enhanced the frequency of SV40/phi X174 recombination.
    • The SV40 replication origin/regulatory region was identified as essential for this enhancement.
    • Linearization of phi X174 DNA did not increase recombination frequency.
    • Recombinant structures contained phi X174 sequences within tandem head-to-tail repeats derived from linear SV40 DNA.
    • Evidence suggests competition for T antigen and a rolling circle replication mechanism.

    Conclusions:

    • Linear SV40 DNA, particularly its origin/regulatory region, acts as a potent enhancer of DNA recombination.
    • The mechanism involves a rolling circle replication pathway generating highly recombinogenic intermediates.
    • This process is distinct from homologous recombination and involves competition for viral replication factors.

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