Mutagenesis and anti-mutagenesis in Salmonella: influence of ethionine and caffeine on yields of mutations induced by 2-aminopurine and 9-aminoacridine.


Ethionine, the ethyl analogue of methionine, slightly reduced the yield of reversions of the hisC3076 frameshift marker induced by 9-aminoacridine (9AA) in an excision-proficient strain of Salmonella typhimurium, but completely abolished mutagenesis by 9AA in the excision-deficient uvrB-deletion strain TA1537. No toxic effects of ethionine were apparent in… (More)


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