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Related Experiment Videos

Transformation by viruses: simian virus 40 as a model system.

C A Noonan, J S Butel

    National Cancer Institute Monograph
    |May 1, 1978
    PubMed
    Summary

    Simian virus 40 (SV40) transformation requires a specific gene product (A-protein) for initiation and maintenance. This viral DNA tumor virus serves as a model for understanding tumorigenesis mechanisms.

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    Area of Science:

    • Virology
    • Oncology
    • Molecular Biology

    Background:

    • Simian virus 40 (SV40) is a DNA tumor virus with a small genome and broad oncogenic potential.
    • SV40-transformed cells express viral genes, making it a model for studying viral tumorigenesis.

    Purpose of the Study:

    • To analyze the mechanism of viral-induced tumorigenesis using SV40.
    • To identify and analyze viral gene expression in transformed cells using temperature-sensitive (ts) mutants.
    • To determine the role of viral genes in initiating and maintaining the transformed state.

    Main Methods:

    • Utilized temperature-sensitive (ts) mutants of SV40 to study viral gene expression.
    • Transformed mouse, hamster, and human cells using ts SV40 with A-gene mutations.
    • Examined transformed cells under permissive and nonpermissive conditions for neoplastic alterations.

    Main Results:

    • A specific gene product (A-protein) is required for the initiation of cellular transformation by SV40.
    • An SV40-specific function is necessary for maintaining some phenotypic properties of the transformed state.
    • SV40 T-antigen is likely a product of the A-gene, based on biological and biochemical comparisons.

    Conclusions:

    • SV40 gene A-protein plays a crucial role in both initiating and maintaining viral transformation.
    • SV40 T-antigen is implicated as the effector of transformation, functioning as the A-gene product.
    • SV40 provides a valuable model for dissecting the molecular mechanisms of viral oncogenesis.

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