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Pathogenicity and Medical Microbiology |
Hans-Knöll-Institute for Natural Products Research, Department of Infection Biology1 and Department of Drug Testing2, Beutenbergstrasse 11, D-07745 Jena, Germany
Friedrich Schiller University, Medical Faculty, Department of Molecular Cell Biology, Drackendorfer Strasse 1, D-07747 Jena, Germany3
Author for correspondence: Raimund Eck. Tel: +49 3641 656852. Fax: +49 3641 656652. e-mail: reck{at}pmail.hki-jena.de
To determine if cellular functions of the phosphatidylinositol 3-kinase CaVps34p are related to processes governing Candida albicans pathogenicity, both copies of the gene were sequentially disrupted. Homozygous deletion of C. albicans VPS34 resulted in a mutant strain which exhibited defects not only in intracellular vesicle transport processes but also in morphogenesis. The CaVPS34 null mutant was unable to form hyphae on different solid media whilst showing a significantly delayed yeast-to-hyphae transition in liquid media. In addition, the mutant was rendered hypersensitive to temperature and osmotic stresses and had a strongly decreased ability to adhere to mouse fibroblast cells compared to the wild-type strain SC5314. Finally, evidence was obtained that CaVPS34 is essential for pathogenicity of C. albicans as the CaVPS34 null mutant was shown to be avirulent in a mouse model of systemic infection. C. albicans pathogenicity was restored to a near wild-type degree upon reintroduction of CaVPS34 into the chromosome of the null mutant, demonstrating that the observed avirulence corresponded to the loss of CaVPS34. Thus, the results suggest that CaVPS34 may serve as a potential target for antifungal drugs.
Keywords: phosphatidylinositol 3-kinase, Candida albicans, gene disruption, virulence factors, pathogenicity
Abbreviations: FCS, foetal calf serum; PI, phosphatidylinositol
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