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Science 21 July 2006:
Vol. 313. no. 5785, pp. 367 - 370
DOI: 10.1126/science.1128242
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Reports

Aneuploidy and Isochromosome Formation in Drug-Resistant Candida albicans

Anna Selmecki,1 Anja Forche,1 Judith Berman1,2*

Resistance to the limited number of available antifungal drugs is a serious problem in the treatment of Candida albicans. We found that aneuploidy in general and a specific segmental aneuploidy, consisting of an isochromosome composed of the two left arms of chromosome 5, were associated with azole resistance. The isochromosome forms around a single centromere flanked by an inverted repeat and was found as an independent chromosome or fused at the telomere to a full-length homolog of chromosome 5. Increases and decreases in drug resistance were strongly associated with gain and loss of this isochromosome, which bears genes expressing the enzyme in the ergosterol pathway targeted by azole drugs, efflux pumps, and a transcription factor that positively regulates a subset of efflux pump genes.

1 Department of Genetics, Cell Biology, and Development, University of Minnesota, 6-160 Jackson Hall, 321 Church Street SE, Minneapolis, MN 55455, USA.
2 Department of Microbiology, University of Minnesota, 6-160 Jackson Hall, 321 Church Street SE, Minneapolis, MN 55455, USA.

* To whom correspondence should be addressed. E-mail: jberman{at}umn.edu

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