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Eukaryotic Cell, June 2007, p. 1041-1052, Vol. 6, No. 6
1535-9778/07/$08.00+0 doi:10.1128/EC.00041-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.
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Aberdeen Fungal Group, School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Aberdeen AB25 2ZD, United Kingdom,1 Unité Biologie et Pathogénicité Fongiques, INRA USC 2019, Institut Pasteur, Paris, France,2 Laboratoire de Parasitologie-Mycologie, Service de Microbiologie, Hôpital Necker-Enfants Malades, Université Paris 5-René Descartes, Faculté de Médecine, Paris, France,3 Laboratory for Mycology, Division of Research and Diagnostics, Center for Disease Control, Taipei, Taiwan,4 Dipartimento di Biologia, Via San Zeno 35-39, Università di Pisa, 56127 Pisa, Italy,5 The Peter Medawar Building for Pathogen Research and Department of Zoology, University of Oxford, OX1 3SY Oxford, United Kingdom6
Received 6 February 2007/ Accepted 23 March 2007
We analyzed data on multilocus sequence typing (MLST), ABC typing, mating type-like locus (MAT) status, and antifungal susceptibility for a panel of 1,391 Candida albicans isolates. Almost all (96.7%) of the isolates could be assigned by MLST to one of 17 clades. eBURST analysis revealed 53 clonal clusters. Diploid sequence type 69 was the most common MLST strain type and the founder of the largest clonal cluster, and examples were found among isolates from all parts of the world. ABC types and geographical origins showed statistically significant variations among clades by univariate analysis of variance, but anatomical source and antifungal susceptibility data were not significantly associated. A separate analysis limited to European isolates, thereby minimizing geographical effects, showed significant differences in the proportions of isolates from blood, commensal carriage, and superficial infections among the five most populous clades. The proportion of isolates with low antifungal susceptibility was highest for MAT homozygous a/a types and then
/
types and was lowest for heterozygous a/
types. The tree of clades defined by MLST was not congruent with trees generated from the individual gene fragments sequenced, implying a separate evolutionary history for each fragment. Analysis of nucleic acid variation among loci and within loci supported recombination. Computational haplotype analysis showed a high frequency of recombination events, suggesting that isolates had mixed evolutionary histories resembling those of a sexually reproducing species.
Published ahead of print on 6 April 2007.
Supplemental material for this article may be found at http://ec.asm.org/.
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