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.

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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