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Infect Immun. 2005 Nov;73(11):7366-74.

Effects of ploidy and mating type on virulence of Candida albicans.

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1
Department of Genetics, Cell Biology, and Development, 320 Church St. SE, Minneapolis, MN 55455, USA.

Abstract

Candida albicans is the most common fungal pathogen of humans. The recent discovery of sexuality in this organism has led to the demonstration of a mating type locus which is usually heterozygous, although some isolates are homozygous. Tetraploids can be formed between homozygotes of the opposite mating type. However, the role of the mating process and tetraploid formation in virulence has not been investigated. We describe here experiments using a murine model of disseminated candidiasis which demonstrate that in three strains, including CAI-4, the most commonly used strain background, tetraploids are less virulent than diploids and can undergo changes in ploidy during infection. In contrast to reports with other strains, we find that MTL homozygotes are almost as virulent as the heterozygotes. These results show that the level of ploidy in Candida albicans can affect virulence, but the mating type configuration does not necessarily do so.

PMID:
16239535
PMCID:
PMC1273887
DOI:
10.1128/IAI.73.11.7366-7374.2005
[Indexed for MEDLINE]
Free PMC Article
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