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Related Experiment Videos

Integrated simian virus 40 sequences in transformed cell DNA: analysis using restriction endonucleases.

G Ketner, T J Kelly

    Proceedings of the National Academy of Sciences of the United States of America
    |April 1, 1976
    PubMed
    Summary

    Simian virus 40 (SV40) DNA integration into mouse cells resulted in unique viral DNA structures and locations for each cell line. This indicates distinct integration patterns during SV40-induced cell transformation.

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    Area of Science:

    • Molecular Biology
    • Virology
    • Genetics

    Background:

    • Simian virus 40 (SV40) is a DNA tumor virus known to induce tumors in various animal species.
    • SV40 DNA can integrate into the host cell genome during the transformation process.
    • Understanding the integration pattern is crucial for comprehending viral oncogenesis.

    Purpose of the Study:

    • To investigate the integration pattern of SV40 DNA in independently transformed BALB/c3T3 mouse cell lines.
    • To determine if the integration sites and structures of SV40 DNA are consistent across different transformants.

    Main Methods:

    • DNA digestion using restriction endonucleases (HpaII and BamHI).
    • Gel electrophoresis for fragment separation.
    • Southern blot analysis with radiolabeled SV40 complementary RNA (cRNA) for detection.

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    Main Results:

    • Each of the five SV40-transformed cell lines yielded a distinct set of DNA fragments containing viral DNA after digestion.
    • The hybridization patterns indicated that the integrated SV40 DNA fragments differed in size and number among the cell lines.

    Conclusions:

    • The structure and/or genomic location of integrated SV40 DNA varies significantly between independent transformants.
    • This heterogeneity in integration suggests multiple integration events or rearrangements during SV40 transformation.