title: Sodium azide-induced mutagenesis in Saccharomyces cerevisiae.
abstract: Sodium azide (0.5--2.0 X 10(-5) M), applied for 24 h on cells growing in complete medium, increased up to 26 times the frequency of reversions and locus-specific suppressor mutations of allele ilv1-92 in diploid strain D7 of Saccharomyces cerevisiae. Similarly, it enhanced the frequency of reversions and/or mitotic gene conversions of alleles trp5-12/trp5-27 up to 19 times. Reconstruction experiments showed that the increase of mutations in complete medium was not due to a selection of prototrophic types under growth conditions and, therefore, that sodium azide acts as a weak mutagen in S. cerevisiae under growth conditions at a low pH. No mutagenic or convertogenic effect was observed when azide was applied to resting cells in buffer at pH 4.2.
mesh_terms: D001386:Azides / Q000494:pharmacology*; D003470:Culture Media; D006863:Hydrogen-Ion Concentration; D009153:Mutagens; D009154:Mutation / Q000187:drug effects; D012441:Saccharomyces cerevisiae / Q000235:genetics*
chemical_list: D001386:Azides; D003470:Culture Media; D009153:Mutagens