AAC Accepts, published online ahead of print on 23 October 2006
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Antimicrob. Agents Chemother. doi:10.1128/AAC.00824-06
Copyright (c) 2006, American Society for Microbiology and/or the Listed Authors/Institutions. All Rights Reserved.

Molecular mechanism of flucytosine resistance in Candida lusitaniae: Contribution of the FCY2, FCY1 and FUR1 genes to 5-fluorouracil and fluconazole cross-resistance

Nicolas Papon, Thierry Noël, Martine Florent, Stéphanie Gibot-Leclerc, Dorothée Jean, Christiane Chastin, Jean Villard, and Florence Chapeland-Leclerc*

Laboratoire des Sciences Végétales, EA209, UFR des Sciences Pharmaceutiques et Biologiques, Université Paris 5, 4 avenue de l'Observatoire, 75006 Paris, France ; Laboratoire de Mycologie Moléculaire, UMR 5162 CNRS-Université Bordeaux 2, 146 rue Léo Saignat, 33076 Bordeaux cedex, France

* To whom correspondence should be addressed. Email: florence.leclerc{at}univ-paris5.fr.


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Abstract

Inactivation of FCY2 (cytosine permease), FCY1 (cytosine deaminase) and FUR1 (uracil phosphoribosyl-transferase) genes in C. lusitaniae produced two patterns of resistance to 5-flucytosine. Mutant fur1 demonstrated resistance to 5-fluorouracil whereas mutants fcy1 and fcy2 demonstrated fluconazole resistance in the presence of subinhibitory 5-flucytosine concentrations.




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