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[Problems concerned with microbial mutagenicity tests].

D Gericke

    Onkologie
    |February 1, 1982
    PubMed
    Summary

    Microbial mutagenicity tests like the Ames test are valuable but have limitations. Factors such as strain preservation and metabolic activation affect results, preventing definitive carcinogenicity predictions.

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    Area of Science:

    • Microbiology
    • Toxicology
    • Genetics

    Background:

    • Microbial mutagenicity assays are standard tools for genotoxicity screening.
    • Several established tests exist, including the Salmonella-typhimurium assay (Ames test), Escherichia coli polymerase A deficiency test, Saccharomyces cerevisiae D3 system, and Neurospora crassa test.
    • Variability in results can arise from differences in tester strain maintenance, solvent selection, compound dosage, and the use of S-9 metabolic activation.

    Purpose of the Study:

    • To review and compare common microbial mutagenicity tests.
    • To identify factors influencing test result variability.
    • To assess the limitations of microbial mutagenicity tests in predicting in vivo carcinogenicity.

    Main Methods:

    • Comparative analysis of Salmonella-typhimurium (Ames), Escherichia coli (polymerase A deficient), Saccharomyces cerevisiae D3, and Neurospora crassa mutagenicity assays.
    • Discussion of procedural variables impacting test outcomes, including tester strain preservation, solvents, dosage, and S-9 metabolic activation.
    • Evaluation of the predictive power of these tests for animal and human carcinogenicity.

    Main Results:

    • The Escherichia coli polymerase A deficient system appears simpler to handle compared to Saccharomyces cerevisiae or Neurospora crassa.
    • Both Salmonella and E. coli systems require metabolic activation (S-9) for accurate assessment.
    • Discrepancies in Ames test outcomes are linked to strain preservation, solvent choice, dosage, and S-9 preparation.

    Conclusions:

    • Microbial mutagenicity tests are essential for initial genotoxicity screening.
    • Standardization of methods, particularly S-9 preparation and strain handling, is crucial for reliable results.
    • These tests alone are insufficient to definitively determine if a substance is carcinogenic in humans or animals.

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