Summary
Some characteristic details of mutagenesis by Berenil, a non-intercalating trypanocidal dye, that govern the change from wild type (ϱ+) to vegetative petite (ϱ−) in Saccharomyces cerevisiae are presented and contrasted with the intercalating mutagens ethidium bromide and euflavine.
The extent and rate of mutagenesis by Berenil is affected by a variety of parameters controlling the cellular and mitochondrial phenotype: among them are exposure to 45°; competition with EB but not euflavine; a requirement for an energy source during and subsequent to exposure to the mutagen; exposure to caffeine; and the presence of genetic blocks in various steps of the mitochondrial repair system for uv-induced lesions. It is, however, insensitive to exposure to Antimycin A. Except for the first of these observations, qualitative differences have emerged between the responses induced by Berenil and the other mutagens, especially ethidium bromide.
Using these observations we have postulated a stepwise sequence of events that can account for the mutagenic action of Berenil.
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Communicated by Ch. Auerbach
Publication No. 2122.
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Perlman, P.S., Mahler, H.R. Induction of respiration deficient mutants in Saccharomyces cerevisiae by Berenil. Molec. Gen. Genet. 121, 295–306 (1973). https://doi.org/10.1007/BF00433229
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DOI: https://doi.org/10.1007/BF00433229