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Antimicrobial Agents and Chemotherapy, May 2000, p. 1255-1265, Vol. 44, No. 5
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Genome-Wide Expression Patterns in Saccharomyces cerevisiae: Comparison of Drug Treatments and Genetic Alterations Affecting Biosynthesis of Ergosterol

Gary F. Bammert and Jennifer M. Fostel*

Pharmacia & Upjohn, Kalamazoo, Michigan 49001

Received 27 September 1999/Returned for modification 15 November 1999/Accepted 14 February 2000

Enzymes in the ergosterol-biosynthetic pathway are the targets of a number of antifungal agents including azoles, allylamines, and morpholines. In order to understand the response of Saccharomyces cerevisiae to perturbations in the ergosterol pathway, genome-wide transcript profiles following exposure to a number of antifungal agents targeting ergosterol biosynthesis (clotrimazole, fluconazole, itraconazole, ketoconazole, voriconazole, terbinafine, and amorolfine) were obtained. These profiles were compared to the transcript profiles of strains containing deletions of one of the late-stage ergosterol genes: ERG2, ERG5, or ERG6. A total of 234 genes were identified as responsive, including the majority of genes from the ergosterol pathway. Expression of several responsive genes, including ERG25, YER067W, and YNL300W, was also monitored by PCR over time following exposure to ketoconazole. The kinetics of transcriptional response support the conditions selected for the microarray experiment. In addition to ergosterol-biosynthetic genes, 36 mitochondrial genes and a number of other genes with roles related to ergosterol function were responsive, as were a number of genes responsive to oxidative stress. Transcriptional changes related to heme biosynthesis were observed in cells treated with chemical agents, suggesting an additional effect of exposure to these compounds. The expression profile in response to a novel imidazole, PNU-144248E, was also determined. The concordance of responsive genes suggests that this compound has the same mode of action as other azoles. Thus, genome-wide transcript profiles can be used to predict the mode of action of a chemical agent as well as to characterize expression changes in response to perturbation of a metabolic pathway.

* Corresponding author. Mailing address: Pharmacia & Upjohn, 7263-267-510, 7000 Portage Rd., Kalamazoo, MI 49001. Phone: (616) 833-4462. Fax: (616) 833-0992. E-mail: jennifer.m.fostel{at}am.pnu.com.

Antimicrobial Agents and Chemotherapy, May 2000, p. 1255-1265, Vol. 44, No. 5
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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