Summary
Fifty-two cultures grown under standard conditions from separate subclones of haploid Saccharomyces strain X2180-1A were exposed to standard treatment with nitrous acid (NA). When the duration of NA-treatment was the same: a) cell survival varied markedly and the frequency distribution of its values differed significantly from the normal one; b) the overall frequency of induced ade1- and ade2-mutants (OMF) and the proportion of complete mutants among them (PCM) also displayed significant subclonal variation, apparently co-ordinated with the variation in survival. In the same experiments several different types of dependence of the OMF and PCM on the duration of NA-treatment were found. Thus the characteristics of the action of NA on yeast cells appeared to be unstable.
Subclones with pronounced and reproducible differences in sensitivity to the lethal action of NA were isolated from X2180-1A without any induction or enrichment technique. This fact proves the genetic nature of the instability discovered, i.e. this instability appears to reflect the behavior of unstable genetic factors playing, along with the stable ones, a role in the control of NA-sensitivity of X2180-1A cells.
Similar content being viewed by others
References
Devin, A.B.: The repair hypothesis and the effect of caffeine on the induction of complete mutants in yeast. Mutat. Res. 35, 337–340 (1976a)
Devin, A.B.: On the instability of yeast cell sensitivity to the action of nitrous acid. Dokl. Akad. Nauk SSSR 227, 1231–1234 (1976b)
Devin, A.B.: On the genetic nature of the instability, revealed in yeast cell sensitivity to the nitrous-acid action. Dokl. Akad. Nauk SSSR, 231, 990–993 (1976c)
Ichikawa-Ryo, H., Kondo, S.: Indirect mutagenesis in phage lambda by ultraviolet preirradiation of host bacteria. J. Mol. Biol. 97, 77–92 (1975)
Jacob, F.: Mutation d'un bacteriophage induite par l'irradiation des seules bactéries-hôtes avant l'infection. C.R. Acad. Sci. 238, 732–734 (1954)
Lawrence, C.W., Christensen, R.: UV mutagenesis in radiation-sensitive strains of yeast. Genetics 82, 207–232 (1976)
Prakash, L.: Effects of genes controlling radiation-sensitivity on chemically induced mutations in Saccharomyces cerevisiae. Genetics 83, 285–301 (1976)
Snedecor, G.W., Cochran, W.G.: Statistical methods, 6th ed. Ames, Iowa: The Iowa State University Press 1967
Witkin, E.M.: Ultraviolet-induced mutation and DNA repair. Ann. Rev. Microbiol. 23, 487–514 (1969)
Author information
Authors and Affiliations
Additional information
Communicated by H. Böhme
Rights and permissions
About this article
Cite this article
Devin, A.B. The unstable sensitivity of yeast cells to lethal and mutagenic action of nitrous acid. Molec. Gen. Genet. 173, 95–100 (1979). https://doi.org/10.1007/BF00267694
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00267694