Cited by 46Antifungal resistance and susceptibilityFungal and yeast genetics researchFungal Plant Pathogen Control

New Mechanisms of Flucytosine Resistance in C. glabrata Unveiled by a Chemogenomics Analysis in S. cerevisiae

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Costa, Catarina, Ponte, Andreia, Pais, Pedro, Santos, Rui, Cavalheiro, Mafalda, Yaguchi, Takashi, Chibana, Hiroji, Teixeira, Miguel Cacho·2015·PLOS ONE

Abstract

5-Flucytosine is currently used as an antifungal drug in combination therapy, but fungal pathogens are rapidly able to develop resistance against this drug, compromising its therapeutic action. The understanding of the underlying resistance mechanisms is crucial to deal with this problem. In this work, the S. cerevisiae deletion mutant collection was screened for increased resistance to flucytosine. Through this chemogenomics analysis, 183 genes were found to confer resistance to this antifungal agent. Consistent with its known effect in DNA, RNA and protein synthesis, the most significant Gene Ontology terms over-represented in the list of 5-flucytosine resistance determinants are related to DNA repair, RNA and protein metabolism. Additional functional classes include carbohydrate and nitrogen-particularly arginine-metabolism, lipid metabolism and cell wall remodeling. Based on the results obtained for S. cerevisiae as a model system, further studies were conducted in the pathogenic yeast Candida glabrata. Arginine supplementation was found to relieve the inhibitory effect exerted by 5-flucytosine in C. glabrata. Lyticase susceptibility was found to increase within the first 30min of 5-flucytosine exposure, suggesting this antifungal drug to act as a cell wall damaging agent. Upon exponential growth resumption in the presence of 5-flucytosine, the cell wall exhibited higher resistance to lyticase, suggesting that cell wall remodeling occurs in response to 5-flucytosine. Additionally, the aquaglyceroporin encoding genes CgFPS1 and CgFPS2, from C. glabrata, were identified as determinants of 5-flucytosine resistance. CgFPS1 and CgFPS2 were found to mediate 5-flucytosine resistance, by decreasing 5-flucytosine accumulation in C. glabrata cells.

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  • Decreased susceptibility towards flucytosine has been associated with point mutations in FCY1, FCY2, and FUR1 genes and the deletion of FPS1 and FPS2 genes.

    “Decreased susceptibility towards flucytosine has been associated with point mutations in FCY1, FCY2, and FUR1 genes and the deletion of FPS1 and FPS2 genes [36,114,115,116,117].”
  • Such flucytosine resistance mechanisms have been observed in C. albicans, C. lusitaniae, and C. glabrata.

    “Such resistance mechanisms have been observed in C. albicans [114], C. lusitaniae [115], and C. glabrata [116,117].”

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Authors
Costa, C., Ponte, A., Pais, P., Santos, R., Cavalheiro, M., Yaguchi, T., Chibana, H., & Teixeira, M. C.
Affiliations
  • University of Lisbon (PT)
  • Chiba University (JP)
Corresponding author
Teixeira, Miguel Cacho
Venue
PLOS ONE
Published
2015-08-12
Volume
10
Issue
8
Pages
e0135110
ISSN
1932-6203 (ISSN-L)
OpenAlex
W1814010719
Cited by
46
References
35
Citations by year
2026: 2 · 2025: 2 · 2024: 4 · 2023: 8 · 2022: 5 · 2021: 6 · 2020: 4 · 2019: 4 · 2018: 4 · 2017: 4 · 2016: 3
FWCI
2.86
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
Funders
  • Drexel University
  • Fundação para a Ciência e a Tecnologia (UID/BIO/04565/2013, PTDC/EBB-BIO/119356/2010)
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
flucytosine resistance, Candida glabrata, chemogenomics, antifungal resistance, arginine metabolism, cell wall remodeling, aquaglyceroporins, drug accumulation, DNA repair
MeSH terms
Antifungal Agents, Candida, Flucytosine, Fungal Proteins, Saccharomyces cerevisiae, Genome, Fungal, Drug Resistance, Fungal, Aquaglyceroporins

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