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Transforming genes in human tumors.

S Pulciani, E Santos, A V Lauver

    Journal of Cellular Biochemistry
    |January 1, 1982
    PubMed
    Summary

    Researchers identified and cloned a specific oncogene from T24 bladder carcinoma cells. This oncogene induced malignant transformation in NIH/3T3 cells, suggesting its role in cancer development.

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    Area of Science:

    • Molecular Biology
    • Oncology
    • Genetics

    Background:

    • Human tumor DNA can induce cellular transformation.
    • Identifying specific oncogenes is crucial for understanding cancer.
    • The T24 bladder carcinoma cell line is a model for studying oncogenesis.

    Purpose of the Study:

    • To isolate and characterize the oncogene responsible for malignant transformation in T24 bladder carcinoma cells.
    • To investigate the transforming potential of cloned human DNA sequences.
    • To compare the cloned oncogene with its normal counterpart.

    Main Methods:

    • DNA transfection into NIH/3T3 cells.
    • Southern blot analysis to identify human DNA sequences in transformants.
    • Molecular cloning using lambda Charon 9A.
    • Focus-forming assays to determine transforming activity.

    Main Results:

    • DNA from human tumors induced morphologic transformation in NIH/3T3 cells.
    • A specific 6.6 kbp Bam HI fragment from T24 cells, cloned as lambda T24-15A, exhibited potent transforming activity.
    • The cloned oncogene showed high relatedness to the transforming gene of BALB-MSV.
    • No significant biochemical differences were found between the oncogene and its normal homologue.

    Conclusions:

    • A specific oncogene from T24 bladder carcinoma cells has been molecularly cloned.
    • This oncogene possesses the ability to induce malignant transformation.
    • The cloned oncogene is evolutionarily related to other known viral transforming genes.
    • Further research is needed to elucidate the biochemical basis of its malignant properties.

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