Cited by 176Antifungal resistance and susceptibilityFungal and yeast genetics researchFungal Plant Pathogen Control

Antifungal drug resistance evoked via RNAi-dependent epimutations

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Calo, Silvia, Shertz-Wall, Cecelia, Lee, Soo Chan, Bastidas, Robert J., Nicolás, Francisco E., Granek, Joshua A., Mieczkowski, Piotr, Torres-Martínez, Santiago +3 more·2014·Nature

Abstract

Microorganisms evolve via a range of mechanisms that may include or involve sexual/parasexual reproduction, mutators, aneuploidy, Hsp90 and even prions. Mechanisms that may seem detrimental can be repurposed to generate diversity. Here we show that the human fungal pathogen Mucor circinelloides develops spontaneous resistance to the antifungal drug FK506 (tacrolimus) via two distinct mechanisms. One involves Mendelian mutations that confer stable drug resistance; the other occurs via an epigenetic RNA interference (RNAi)-mediated pathway resulting in unstable drug resistance. The peptidylprolyl isomerase FKBP12 interacts with FK506 forming a complex that inhibits the protein phosphatase calcineurin. Calcineurin inhibition by FK506 blocks M. circinelloides transition to hyphae and enforces yeast growth. Mutations in the fkbA gene encoding FKBP12 or the calcineurin cnbR or cnaA genes confer FK506 resistance and restore hyphal growth. In parallel, RNAi is spontaneously triggered to silence the fkbA gene, giving rise to drug-resistant epimutants. FK506-resistant epimutants readily reverted to the drug-sensitive wild-type phenotype when grown without exposure to the drug. The establishment of these epimutants is accompanied by generation of abundant fkbA small RNAs and requires the RNAi pathway as well as other factors that constrain or reverse the epimutant state. Silencing involves the generation of a double-stranded RNA trigger intermediate using the fkbA mature mRNA as a template to produce antisense fkbA RNA. This study uncovers a novel epigenetic RNAi-based epimutation mechanism controlling phenotypic plasticity, with possible implications for antimicrobial drug resistance and RNAi-regulatory mechanisms in fungi and other eukaryotes.

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  • In M. circinelloides, RNAi-mediated epimutations can confer antifungal resistance via degradation of mRNAs of drug target genes.

    “In Mucor circinelloides (causative agent of mucormycosis), RNAi (RNA interference)-mediated epimutations can confer antifungal resistance via degradation of mRNAs of drug target genes100,101.”

    From Molecular mechanisms governing antifungal drug resistance (2023) · cites this paper as [101]

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Authors
Calo, S., Shertz-Wall, C., Lee, S. C., Bastidas, R. J., Nicolás, F. E., Granek, J. A., Mieczkowski, P., Torres-Martínez, S., Ruiz-Vázquez, R. M., Cardenas, M. E., & Heitman, J.
Affiliations
  • Duke Medical Center (US)
  • Universidad de Murcia (ES)
  • Duke University (US)
  • University of North Carolina at Chapel Hill (US)
Corresponding author
Heitman, Joseph
Venue
Nature
Published
2014-07-27
Volume
513
Issue
7519
Pages
555-558
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2007345431
Cited by
175
References
44
Citations by year
2026: 13 · 2025: 11 · 2024: 22 · 2023: 16 · 2022: 21 · 2021: 16 · 2020: 20 · 2019: 10 · 2018: 5 · 2017: 15 · 2016: 13 · 2015: 9 · 2014: 4
FWCI
9.57
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • Ministerio de Ciencia e Innovación
  • National Institutes of Health (5r01ca154499-05)
  • National Cancer Institute (R01-CA154499, R01 CA154499-04)
  • National Institute of Allergy and Infectious Diseases (R37AI039115, R37 AI 39115-17, R01 AI50438-10, R01AI050438, R01AI039115)
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
Mucor circinelloides, antifungal resistance, tacrolimus, FK506, RNA interference, epimutations, epigenetic silencing, FKBP12, calcineurin, yeast growth, opportunistic fungal pathogens
MeSH terms
Humans, Molecular Sequence Data, Mucor, Mucormycosis, Mutation, Phenotype, Tacrolimus, Calcineurin, Tacrolimus Binding Protein 1A, Drug Resistance, Fungal, Hyphae, RNA Interference, Epigenesis, Genetic, Calcineurin Inhibitors

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