The ability of aflatoxins B1 and G1 to induce back mutations to arg+ in Escherichia coli K-12/343/113 was compared with induction of mitotic gene conversion to ade+ in the diploid yeast strain Saccharomyces cerevisiae D4, ade2 -. In analogy to previous results with other microorganisms, the compounds were not genetically active per se, indicating that under the experimental conditions employed none of the tester strains were able to activate the compounds to mutagenic products. In experiments using liver homegenates (S-9 fraction) of male Golden Syrian hamsters previously treated with phenobarbital, aflatoxin B1 exhibited strong genetic activity both in E. coli and in S. cerevisiae, whereas the mutagenic activity of aflatoxin G1 was markedly lower and could be detected only in the E. coli tester strain. These results correlate the findings that aflatoxin G1 is a less potent carcinogen and mutagen than aflatoxin B1. ?? 1977.
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