Cited by 339Antifungal resistance and susceptibilityFungal and yeast genetics researchFungal Plant Pathogen Control

Multiple Molecular Mechanisms Contribute to a Stepwise Development of Fluconazole Resistance in Clinical Candida albicans Strains

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Franz, Renate, Kelly, Steven L., Lamb, David C., Kelly, Diane E., Ruhnke, Markus, Morschhäuser, Joachim·1998·Antimicrobial Agents and Chemotherapy

Abstract

From each of two AIDS patients with oropharyngeal candidiasis, five Candida albicans isolates from recurrent episodes of infection which became gradually resistant against fluconazole during antimycotic treatment were analyzed for molecular changes responsible for drug resistance. In both patients, a single C. albicans strain was responsible for the recurrent infections, but the CARE-2 fingerprint pattern of the isolates exhibited minor genetic alterations, indicating that microevolution of the strains took place during fluconazole therapy. In the isolates from patient 1, enhanced mRNA levels of the MDR1 gene, encoding a multiple drug resistance protein from the superfamily of major facilitators, and constitutive high expression of the ERG11 gene, coding for the drug target enzyme sterol 14alpha-demethylase, correlated with a stepwise development of fluconazole resistance. The resistant strains exhibited reduced accumulation of fluconazole and, for the last in the series, a slight increase in drug needed to inhibit sterol 14alpha-demethylation in vitro. In the isolates from patient 2, increased MDR1 mRNA levels and the change from heterozygosity to homozygosity for a mutant form of the ERG11 gene correlated with continuously decreased drug susceptibility. In this series, reduced drug accumulation and increased resistance in the target enzyme activity, sterol 14alpha-demethylase, were observed. These results demonstrate that different molecular mechanisms contribute to a gradual development of fluconazole resistance in C. albicans.

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  1. Ausubel, F. M., R. Brent, R. E. Kingston, D. D. Moore, J. G. Seidman, J. A. Smith, and K. Struhl (ed.). 1989. Current protocols in molecular biology.
  2. John Wiley & Sons, Inc., New York, N.Y.
  3. Odds, F. C. 1988. Candida and candidosis: a review and bibliography. Bail- liere Tindall, London, United Kingdom.

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Authors
Franz, R., Kelly, S. L., Lamb, D. C., Kelly, D. E., Ruhnke, M., & Morschhäuser, J.
Affiliations
  • University of Würzburg (DE)
  • Aberystwyth University (GB)
  • Humboldt-Universität zu Berlin (DE)
  • <!--label omitted: 1-->Zentrum für Infektionsforschung, Universität Würzburg, D-97070 Würzburg,1 and
Venue
Antimicrobial Agents and Chemotherapy
Published
1998-12
Volume
42
Issue
12
Pages
3065-3072
ISSN
  • 0066-4804 (ISSN-L)
  • 1098-6596
OpenAlex
W2160765565
Cited by
339
References
38
Citations by year
2026: 6 · 2025: 4 · 2024: 7 · 2023: 9 · 2022: 4 · 2021: 11 · 2020: 14 · 2019: 15 · 2018: 8 · 2017: 14 · 2016: 11 · 2015: 10 · 2014: 16 · 2013: 12 · 2012: 7
FWCI
9.08
Type
journal article
Language
en
Open access
Locations
  • Antimicrobial Agents and Chemotherapy (publishedVersion)
  • PubMed Central (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed (publishedVersion)
Funders
Bundesministerium für Bildung und Forschung
Topics
  • Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Fungal Plant Pathogen Control
Keywords
Candida albicans, fluconazole resistance, oropharyngeal candidiasis, AIDS, MDR1 gene, ERG11, sterol 14α-demethylase, major facilitator superfamily, drug accumulation, microevolution, recurrent infections, antifungal resistance mechanisms
MeSH terms
Alleles, Antifungal Agents, Candida albicans, Candidiasis, Cytochrome P-450 Enzyme System, Drug Resistance, Microbial, Gene Expression Regulation, Humans, Gas Chromatography-Mass Spectrometry, Microbial Sensitivity Tests, Nucleic Acid Hybridization, Oxidoreductases, RNA, Bacterial, Blotting, Southern, Blotting, Northern, Fluconazole, AIDS-Related Opportunistic Infections, Genes, MDR, Sterol 14-Demethylase

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