Candida albicans: population structure and properties determined by multi-locus sequence typing

Arianna Tavanti, Amanda Denise Davidson, Mark John Fordyce, Neil Andrew Robert Gow, M. C. J. Maiden, Frank Christopher Odds

Research output: Contribution to journalArticle

127 Citations (Scopus)

Abstract

We submitted a panel of 416 isolates of Candida albicans from separate sources to multilocus sequence typing (MLST). The data generated determined a population structure in which four major clades of closely related isolates were delineated, together with eight minor clades comprising five or more isolates. By Fisher's exact test, a statistically significant association was found between particular clades and the anatomical source, geographical source, ABC genotype, decade of isolation, and homozygosity versus heterozygosity at the mating type-like locus (MTL) of the isolates in the clade. However, these associations may have been influenced by confounding variables, since in a univariate analysis of variance, only the clade associations with ABC type and anatomical source emerged as statistically significant, providing the first indication of possible differences between C. albicans strain type clades and their propensity to infect or colonize different anatomical locations. There were no significant differences between clades with respect to distributions of isolates resistant to fluconazole, itraconazole, or flucytosine. However, the majority of flucytosine-resistant isolates belonged to clade 1, and these isolates, but not flucytosine-resistant isolates in other clades, bore a unique mutation in the FUR1 gene that probably accounts for their resistance. A significantly higher proportion of isolates resistant to fluconazole, itraconazole, and flucytosine were homozygous at the MTL, suggesting that antifungal pressure may trigger a common mechanism that leads both to resistance and to MTL homozygosity. The utility of MLST for determining clade assignments of clinical isolates will form the basis for strain selection for future research into C albicans virulence.

Original languageEnglish
Pages (from-to)5601-5613
Number of pages12
JournalJournal of Clinical Microbiology
Volume43
DOIs
Publication statusPublished - 2005

Keywords

  • HUMAN-IMMUNODEFICIENCY-VIRUS
  • DRUG-RESISTANCE
  • FLUCYTOSINE RESISTANCE
  • GENETIC-STRUCTURE
  • AZOLE RESISTANCE
  • CLADE
  • SUSCEPTIBILITY
  • FLUCONAZOLE
  • STRAINS
  • PATIENT

Cite this

Candida albicans: population structure and properties determined by multi-locus sequence typing. / Tavanti, Arianna; Davidson, Amanda Denise; Fordyce, Mark John; Gow, Neil Andrew Robert; Maiden, M. C. J.; Odds, Frank Christopher.

In: Journal of Clinical Microbiology, Vol. 43, 2005, p. 5601-5613.

Research output: Contribution to journalArticle

Tavanti, Arianna ; Davidson, Amanda Denise ; Fordyce, Mark John ; Gow, Neil Andrew Robert ; Maiden, M. C. J. ; Odds, Frank Christopher. / Candida albicans: population structure and properties determined by multi-locus sequence typing. In: Journal of Clinical Microbiology. 2005 ; Vol. 43. pp. 5601-5613.
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AB - We submitted a panel of 416 isolates of Candida albicans from separate sources to multilocus sequence typing (MLST). The data generated determined a population structure in which four major clades of closely related isolates were delineated, together with eight minor clades comprising five or more isolates. By Fisher's exact test, a statistically significant association was found between particular clades and the anatomical source, geographical source, ABC genotype, decade of isolation, and homozygosity versus heterozygosity at the mating type-like locus (MTL) of the isolates in the clade. However, these associations may have been influenced by confounding variables, since in a univariate analysis of variance, only the clade associations with ABC type and anatomical source emerged as statistically significant, providing the first indication of possible differences between C. albicans strain type clades and their propensity to infect or colonize different anatomical locations. There were no significant differences between clades with respect to distributions of isolates resistant to fluconazole, itraconazole, or flucytosine. However, the majority of flucytosine-resistant isolates belonged to clade 1, and these isolates, but not flucytosine-resistant isolates in other clades, bore a unique mutation in the FUR1 gene that probably accounts for their resistance. A significantly higher proportion of isolates resistant to fluconazole, itraconazole, and flucytosine were homozygous at the MTL, suggesting that antifungal pressure may trigger a common mechanism that leads both to resistance and to MTL homozygosity. The utility of MLST for determining clade assignments of clinical isolates will form the basis for strain selection for future research into C albicans virulence.

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