Eduardo Álvarez Duarte , Nicolás Cepeda , Jean Miranda
{"title":"Azole resistance in a clinical isolate of Aspergillus fumigatus from Chile","authors":"Eduardo Álvarez Duarte , Nicolás Cepeda , Jean Miranda","doi":"10.1016/j.riam.2024.04.003","DOIUrl":null,"url":null,"abstract":"<div><h3>Background</h3><div><em>Aspergillus fumigatus</em> is a ubiquitous opportunistic pathogen. This fungus can acquire resistance to azole antifungals due to different mutations in the cyp51A gene. Azole resistance has been observed in several continents and appears to be a globally distributed phenomenon. Specific mutations in cyp51A that lead to azole resistance, such as the TR34/L98H modification, have been reported.</div></div><div><h3>Aims</h3><div>To evaluate the azole resistance in clinically isolated <em>A. fumigatus</em> strains.</div></div><div><h3>Methods</h3><div>As a result of our passive surveillance strategy, a total of 23 <em>A. fumigatus</em> isolates from clinical origins were identified through a phylogenetic analysis using the ITS region and β-tubulin gene fragments, and typed with the CSP microsatellite. Azole susceptibility profiles were performed by disk diffusion and microdilution broth methodologies according to CLSI guidelines.</div></div><div><h3>Results</h3><div>Here we describe, for the first time, the detection of azole-resistant <em>A. fumigatus</em> isolates from clinical origins in Chile with mutations in the cyp51A gene. In addition to the TR34/L98H mutation, one isolate exhibited an F46Y/M172V/E427K-type mutation. Furthermore, microsatellite typing based on cell surface protein (CSP) was performed, showing the t02 (TR34/L98H), t15 (F46Y/M172V/E427K) and t01 (susceptible clinical isolates) genotypes.</div></div><div><h3>Conclusions</h3><div>Our study demonstrates the presence of mutations related to azole resistance in <em>A. fumigatus</em> strains isolated from clinical samples in Chile. In order to obtain information that may help to tackle the spread of antifungal resistance among <em>A. fumigatus</em> populations, and to ensure the efficacy of future treatments against aspergillosis, a further research is necessary.</div></div>","PeriodicalId":21291,"journal":{"name":"Revista Iberoamericana De Micologia","volume":"41 1","pages":"Pages 7-12"},"PeriodicalIF":1.5000,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Revista Iberoamericana De Micologia","FirstCategoryId":"99","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S113014062400007X","RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MYCOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Background
Aspergillus fumigatus is a ubiquitous opportunistic pathogen. This fungus can acquire resistance to azole antifungals due to different mutations in the cyp51A gene. Azole resistance has been observed in several continents and appears to be a globally distributed phenomenon. Specific mutations in cyp51A that lead to azole resistance, such as the TR34/L98H modification, have been reported.
Aims
To evaluate the azole resistance in clinically isolated A. fumigatus strains.
Methods
As a result of our passive surveillance strategy, a total of 23 A. fumigatus isolates from clinical origins were identified through a phylogenetic analysis using the ITS region and β-tubulin gene fragments, and typed with the CSP microsatellite. Azole susceptibility profiles were performed by disk diffusion and microdilution broth methodologies according to CLSI guidelines.
Results
Here we describe, for the first time, the detection of azole-resistant A. fumigatus isolates from clinical origins in Chile with mutations in the cyp51A gene. In addition to the TR34/L98H mutation, one isolate exhibited an F46Y/M172V/E427K-type mutation. Furthermore, microsatellite typing based on cell surface protein (CSP) was performed, showing the t02 (TR34/L98H), t15 (F46Y/M172V/E427K) and t01 (susceptible clinical isolates) genotypes.
Conclusions
Our study demonstrates the presence of mutations related to azole resistance in A. fumigatus strains isolated from clinical samples in Chile. In order to obtain information that may help to tackle the spread of antifungal resistance among A. fumigatus populations, and to ensure the efficacy of future treatments against aspergillosis, a further research is necessary.
期刊介绍:
Revista Iberoamericana de Micología (Ibero-American Journal of Mycology) is the official journal of the Asociación Española de Micología, Asociación Venezolana de Micología and Asociación Argentina de Micología (The Spanish, Venezuelan, and Argentinian Mycology Associations). The Journal gives priority to publishing articles on studies associated with fungi and their pathogenic action on humans and animals, as well as any scientific studies on any aspect of mycology. The Journal also publishes, in Spanish and in English, original articles, reviews, mycology forums, editorials, special articles, notes, and letters to the editor, that have previously gone through a scientific peer review process.