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- Title
Identification and Dissection of a Complex DNA Repair Sensitivity Phenotype in Baker's Yeast.
- Authors
Demogines, Ann; Smith, Erin; Kruglyak, Leonid; Alani, Eric
- Abstract
Complex traits typically involve the contribution of multiple gene variants. In this study, we took advantage of a high-density genotyping analysis of the BY (S288c) and RM strains of Saccharomyces cerevisiae and of 123 derived spore progeny to identify the genetic loci that underlie a complex DNA repair sensitivity phenotype. This was accomplished by screening hybrid yeast progeny for sensitivity to a variety of DNA damaging agents. Both the BY and RM strains are resistant to the ultraviolet light-mimetic agent 4-nitroquinoline 1-oxide (4-NQO); however, hybrid progeny from a BY×RM cross displayed varying sensitivities to the drug. We mapped a major quantitative trait locus (QTL), RAD5, and identified the exact polymorphism within this locus responsible for 4-NQO sensitivity. By using a backcrossing strategy along with array-assisted bulk segregant analysis, we identified one other locus, MKT1, and a QTL on Chromosome VII that also link to the hybrid 4-NQO-sensitive phenotype but confer more minor effects. This work suggests an additive model for sensitivity to 4-NQO and provides a strategy for mapping both major and minor QTL that confer background-specific phenotypes. It also provides tools for understanding the effect of genetic background on sensitivity to genotoxic agents.
- Subjects
NEUTRON multiplicity; SACCHAROMYCES cerevisiae; DNA repair; GENETIC polymorphisms; NITROQUINOLINE oxide
- Publication
PLoS Genetics, 2008, Vol 4, Issue 7, p1
- ISSN
1553-7390
- Publication type
Article
- DOI
10.1371/journal.pgen.1000123