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Studies in comparative chemical mutagenesis.

F H Sobels

    Environmental Mutagenesis
    |January 1, 1985
    PubMed
    Summary

    This review highlights collaborative studies in comparative mutagenesis. The L5178Y (trifluorothymidine resistant) system excelled in mammalian point mutation assays, while chromosomal aberrations proved optimal for in vitro testing.

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    Area of Science:

    • Environmental Mutagenesis
    • Toxicology
    • Genetics

    Background:

    • Comparative mutagenesis research involves multiple international and national programs.
    • Understanding chemical mutagenicity requires standardized testing protocols and dosimetry.
    • Previous studies have evaluated various in vitro and in vivo assays for detecting genetic damage.

    Purpose of the Study:

    • To review and synthesize findings from key collaborative studies in comparative mutagenesis.
    • To assess the performance and detection capabilities of different mutagenicity testing systems.
    • To identify optimal assays for evaluating environmental mutagens.

    Main Methods:

    • Review of published data from six major collaborative studies.
    • Analysis of results from Drosophila studies with alkylating agents.
    • Evaluation of mammalian point mutation assays, specifically the L5178Y (TFTR) system.
    • Assessment of in vitro assays for chromosomal aberrations, aneuploidy, polyploidy, and sister chromatid exchanges.

    Main Results:

    • The L5178Y (trifluorothymidine resistant) system demonstrated high detection capability in mammalian point mutation assays during the second UKEMS study.
    • The International Programme on Chemical Safety (IPCS) in vitro study concluded that chromosomal aberration assays are optimal for complementing the Salmonella assay.
    • Chromosomal aberration assays facilitate easy assessment of aneuploidy, polyploidy, and sister chromatid exchanges.

    Conclusions:

    • Standardized chemical dosimetry is crucial for accurate comparative mutagenesis studies.
    • The L5178Y (TFTR) system is a highly sensitive mammalian point mutation assay.
    • Chromosomal aberration assays are valuable tools for comprehensive genotoxicity testing, complementing bacterial assays.

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