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Related Experiment Videos

Delayed mutation in Chinese hamster cells.

T Stamato, R Weinstein, B Peters

    Somatic Cell and Molecular Genetics
    |January 1, 1987
    PubMed
    Summary
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    Ethyl methane sulfonate (EMS) causes delayed mutations in Chinese hamster cells, extending over 10-14 cell generations. This finding suggests current mutagenicity tests may underestimate the full impact of DNA alkylating agents.

    Area of Science:

    • Genetics and Molecular Biology
    • Cell Biology
    • Toxicology

    Background:

    • Mutations are permanent alterations in DNA sequence.
    • Understanding mutation timing is crucial for assessing mutagenic potential.
    • Ethyl methane sulfonate (EMS) is a known DNA alkylating agent.

    Purpose of the Study:

    • To investigate delayed mutational events following EMS treatment in Chinese hamster cells.
    • To determine the duration of mutation induction after mutagen exposure.
    • To evaluate the implications for current mutagenicity testing methods.

    Main Methods:

    • Treatment of Chinese hamster cells with ethyl methane sulfonate (EMS).
    • Colony replating to assess glucose-6-phosphate dehydrogenase (G6PD)-deficient mutants.

    Related Experiment Videos

  • Selective medium containing 6-thioguanine (6TG) to identify resistant colonies.

    • Main Results:

    • Replating yielded discrete ratios of G6PD-deficient to wild-type colonies, indicating delayed mutations.
    • 6-thioguanine-resistant colonies showed a wide distribution, consistent with mutations occurring over multiple cell generations.
    • EMS induced mutations over at least 10-14 cell generations post-treatment.

    Conclusions:

    • Mutational events induced by EMS are significantly delayed, occurring over many cell divisions.
    • Current methods for assessing mutagenic potential may underestimate the effects of agents like EMS.
    • The study highlights the importance of considering mutation expression time in genotoxicity assessments.