Current Genetics

, Volume 21, Issue 4, pp 319–324

Isolation and characterization of additional genes influencing resistance to various mutagens in the yeast Saccharomyces cerevisiae


  • Eckard Haase
    • Institut für Mikrobiologie der J.W. Goethe-Universität
  • Jörg Servos
    • Institut für Mikrobiologie der J.W. Goethe-Universität
  • Martin Brendel
    • Institut für Mikrobiologie der J.W. Goethe-Universität
Original Articles

DOI: 10.1007/BF00351689

Cite this article as:
Haase, E., Servos, J. & Brendel, M. Curr Genet (1992) 21: 319. doi:10.1007/BF00351689


Screening of a multi-copy vector-based yeast genomic library in haploid cells of wild-type Saccharomyces cerevisiae yielded transformants hyper-resistant to various chemical mutagens. Genetical analysis of the yeast insert DNAs revealed three genes SNG1, SNQ2, and SNQ3 that confer the phenotype hyper-resistance to MNNG, to 4-NQO and triaziquone, and to mutagens 4-NQO, MNNG, and triaziquone, respectively. Integration of the gene disruption-constructs into the haploid yeast genome yielded viable null-mutants with a mutagen-sensitive phenotype. Thus, copy number of these non-essential yeast genes determines the relative resistance to certain chemical mutagens, with zero copies yielding a phenotype of mutagen sensitivity and multiple copies one of mutagen hyper-resistance, respectively.

Key words

Multi-copy plasmidHyper-resistance4-NQOMNNGTriaziquone
Download to read the full article text

Copyright information

© Springer-Verlag 1992