Cited by 121Antifungal resistance and susceptibilityFungal and yeast genetics researchFungal Plant Pathogen Control

Candida parapsilosis Resistance to Fluconazole: Molecular Mechanisms and In Vivo Impact in Infected Galleria mellonella Larvae

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Souza, Ana Carolina R., Fuchs, Beth Burgwyn, Pinhati, Henrique M. S., Siqueira, Ricardo A., Hagen, Ferry, Meis, Jacques F., Mylonakis, Eleftherios, Colombo, Arnaldo L.·2015·Antimicrobial Agents and Chemotherapy

Abstract

Candida parapsilosis is the main non-albicans Candida species isolated from patients in Latin America. Mutations in the ERG11 gene and overexpression of membrane transporter proteins have been linked to fluconazole resistance. The aim of this study was to evaluate the molecular mechanisms in fluconazole-resistant strains of C. parapsilosis isolated from critically ill patients. The identities of the nine collected C. parapsilosis isolates at the species level were confirmed through molecular identification with a TaqMan qPCR assay. The clonal origin of the strains was checked by microsatellite typing. The Galleria mellonella infection model was used to confirm in vitro resistance. We assessed the presence of ERG11 mutations, as well as the expression of ERG11 and two additional genes that contribute to antifungal resistance (CDR1 and MDR1), by using real-time quantitative PCR. All of the C. parapsilosis (sensu stricto) isolates tested exhibited fluconazole MICs between 8 and 16 μg/ml. The in vitro data were confirmed by the failure of fluconazole in the treatment of G. mellonella infected with fluconazole-resistant strains of C. parapsilosis. Sequencing of the ERG11 gene revealed a common mutation leading to a Y132F amino acid substitution in all of the isolates, a finding consistent with their clonal origin. After fluconazole exposure, overexpression was noted for ERG11, CDR1, and MDR1 in 9/9, 9/9, and 2/9 strains, respectively. We demonstrated that a combination of molecular mechanisms, including the presence of point mutations in the ERG11 gene, overexpression of ERG11, and genes encoding efflux pumps, are involved in fluconazole resistance in C. parapsilosis.

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Crossref · 10.1128/aac.01177-15

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  • Resistance to azoles in C. parapsilosis has been attributed to mutations in MRR1 and ERG11 (Y132F alone or with R398I), and overexpression of CDR1, MDR1, and ERG11.

    “Resistance to azoles in C. parapsilosis has been attributed to mutations in the transcription factor gene MRR1 [84] and ERG11 (Y132F, either alone or in combination with an R398I) [85,86,87], and overexpression of CDR1, MDR1, and ERG11 [85,86,88].”

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  1. [27]Pinhati HM, Casulari LA, Bizerra FC, Siqueira RA, Castro FF, Colombo AL. 2013. Outbreak of candidemia due to fluconazole resistant Candida parapsilosis strains in a tertiary care hospital in Brazil, abstr K-1707 Abstr 53th Intersci Conf Antimicrob Agents Chemother. [Google Scholar]
  2. [30]Clinical and Laboratory Standards Institute. 2008. Reference method for broth dilution antifungal susceptibility testing of yeasts, 3rd ed Approved standard M27-A3. CLSI, Wayne, PA. [Google Scholar]
  3. [31]Clinical and Laboratory Standards Institute. 2012. Reference method for broth dilution antifungal susceptibility testing of yeasts. Fourth informational supplement M27-S4. CLSI, Wayne, PA. [Google Scholar]
  4. [57]Souza AC, Fuchs BB, Siqueira RA, Pinhati HM, Mylonakis E, Colombo AL. 2014. Abstr 54th Intersci Conf Antimicrob Agents Chemother, abstr M-1094. [DOI] [PMC free article] [PubMed] [Google Scholar]

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Authors
Souza, A. C. R., Fuchs, B. B., Pinhati, H. M. S., Siqueira, R. A., Hagen, F., Meis, J. F., Mylonakis, E., & Colombo, A. L.
Affiliations
  • Universidade Federal de São Paulo (BR)
  • Brown University (US)
  • Universidade de Brasília (BR)
  • Canisius-Wilhelmina Ziekenhuis (NL)
  • Radboud University Medical Center (NL)
Venue
Antimicrobial Agents and Chemotherapy
Published
2015-10
Volume
59
Issue
10
Pages
6581-6587
ISSN
  • 0066-4804 (ISSN-L)
  • 1098-6596
OpenAlex
W2161253853
Cited by
121
References
55
Citations by year
2026: 5 · 2025: 8 · 2024: 6 · 2023: 10 · 2022: 20 · 2021: 6 · 2020: 14 · 2019: 14 · 2018: 16 · 2017: 15 · 2016: 5 · 2015: 2
FWCI
9.86
Type
journal article
Language
en
Open access
Locations
  • Antimicrobial Agents and Chemotherapy (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
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 parapsilosis, fluconazole resistance, ERG11 mutations, efflux pumps, CDR1, MDR1, antifungal resistance mechanisms, Galleria mellonella infection model, clonal origin, microsatellite typing, critically ill patients, non-albicans Candida
MeSH terms
Animals, Antifungal Agents, Candida, Larva, Microbial Sensitivity Tests, Moths, Fluconazole, Drug Resistance, Fungal

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