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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Genetic analysis of mutants of Saccharomyces cerevisiae resistant to the herbicide sulfometuron methyl.

Sulfometuron methyl (SM), a potent new sulfonylurea herbicide, inhibits growth of the yeast Saccharomyces cerevisiae on minimal media. Sixty-six spontaneous mutants resistant to SM were isolated. All of the resistance mutations segregate 2:2 in tetrads; 51 of the mutations are dominant, five are semidominant and ten are recessive. The mutations occur in three linkage groups, designated SMR1, smr2 and smr3. Several lines of evidence demonstrate that the SMR1 mutations (47 dominant and four semidominant) are alleles of ILV2 which encodes acetolactate synthase ( ALS), the target of SM. First, SMR1 mutations result in the production of ALS enzyme activity with increased resistance to SM. Second, molecular cloning of the ILV2 gene permitted the isolation of mutations in the cloned gene which result in the production of SM-resistant ALS. Finally, SMR1 mutations map at the ILV2 locus. The smr2 mutations (four recessive, two dominant and one semidominant) map at the pdr 1 (pleiotropic drug resistance) locus and show cross-resistance to other inhibitors, typical of mutations at this locus. The smr3 mutations (six recessive and two dominant) define a new gene which maps approximately midway between ADE2 and HIS3 on the right arm of chromosome XV.[1]


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