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Activation of N-ras in a human melanoma cell line

R A Padua, N C Barrass, G A Currie

    Molecular and Cellular Biology
    |March 1, 1985
    PubMed

    Insights

    Human melanoma DNA transforms mouse cells by activating the N-ras gene. A specific mutation at codon 61 was identified, confirming its role in the transforming activity of this oncogene.

    Area of Science:

    • Oncology
    • Molecular Biology
    • Genetics

    Background:

    • Human melanoma cell lines can harbor activated oncogenes.
    • Identifying specific gene mutations is crucial for understanding cancer development.

    Purpose of the Study:

    • To identify the transforming gene in the Mel Swift melanoma cell line.
    • To characterize the mutation responsible for the transforming activity.

    Main Methods:

    • DNA transfection into NIH3T3 cells.
    • Southern blot analysis.
    • Oligonucleotide hybridization.
    • DNA sequencing.
    • Recombinant DNA technology.

    Main Results:

    • DNA from Mel Swift cells induced transformation of NIH3T3 cells.
    • The N-ras gene was identified as the transforming gene.
    • A specific mutation (AAA) at codon 61 of N-ras was detected and confirmed.
    • The mutation at codon 61 was essential for biological activity.

    Conclusions:

    • The N-ras gene with a mutation at codon 61 is responsible for the transforming activity of the Mel Swift melanoma cell line.
    • This specific N-ras mutation leads to a glutamine-to-lysine substitution, conferring oncogenic properties.

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