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Related Experiment Videos

SV40-based Escherichia coli shuttle vectors infectious for monkey cells.

C F Menck, A Sarasin, M R James

    Gene
    |January 1, 1987
    PubMed
    Summary

    New SV40-based shuttle vectors enable efficient DNA rescue and analysis in bacteria after replication in monkey cells. This system offers stable plasmid transmission and reduced mutation frequency for genetic studies.

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    Area of Science:

    • Molecular Biology
    • Virology
    • Bacteriology

    Background:

    • Development of versatile DNA vectors is crucial for molecular biology research.
    • Shuttle vectors facilitate genetic manipulation and analysis across different host systems.
    • Simian virus 40 (SV40) offers a robust platform for viral vector development.

    Purpose of the Study:

    • To engineer novel SV40-based Escherichia coli shuttle vectors.
    • To enable efficient rescue and screening of DNA alterations in bacteria.
    • To combine the advantages of viral transduction with bacterial plasmid analysis.

    Main Methods:

    • Construction of SV40-based shuttle vectors capable of packaging into pseudovirions.
    • Replication and transmission studies in monkey COS cells without helper virus.
    • Rescue of extrachromosomal vector DNA in E. coli for mutation screening.
    • Construction of an expression vector with the chloramphenicol acetyl transferase gene.

    Main Results:

    • SV40-based vectors replicate and transmit as infectious virus in COS cells.
    • Vector DNA can be efficiently rescued in E. coli, allowing for easy screening of DNA alterations.
    • Some vector constructions demonstrated high stability with no detectable rearrangements after multiple lytic cycles.
    • The spontaneous mutation frequency at the lacO target in bacteria was lower than typically observed with other shuttle vectors.
    • An expression vector facilitated efficient gene transduction via infection.

    Conclusions:

    • SV40-based shuttle vectors provide a powerful tool for genetic studies by integrating viral and bacterial systems.
    • These vectors offer a stable and efficient method for DNA rescue, analysis, and gene expression.
    • The system simplifies the screening of DNA alterations and reduces mutation frequency, enhancing research capabilities.

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