Hazard of agricultural triazole fungicide : Does cyproconazole induce voriconazole resistance in Aspergillus fumigatus isolates?
Copyright: © 2020, Published by Mazandaran University of Medical Sciences on behalf of Iranian Society of Medical Mycology and Invasive Fungi Research Center..
BACKGROUND AND PURPOSE: The present study aimed to evaluate the effect of cyproconazole, the most used fungicide in Iranian wheat farms, on the induction of voriconazole resistance in Aspergillus fumigatus isolates.
MATERIALS AND METHODS: A collection of 20 clinical and environmental isolates were selected for investigation of the in vitro activity of fungicides. The minimum inhibitory concentrations (MICs) were determined by the documented broth microdilution method M38-A2 (CLSI, 2008). Induction experiments were performed and the possibly induced isolate(s) were subjected to antifungal susceptibility testing, sequencing of the CYP51A promoter, and full coding gene. Furthermore, CYP51-protein homology modeling and docking modes were evaluated using SWISS-MODEL (https://swissmodel.expasy.org/) and SEESAR software (version 9.1).
RESULTS: Among 10 susceptible isolates, only one strain showed a high MIC value against voriconazole (MIC=4µg/ml) after 25 passages. Nevertheless, sequencing of the CYP51A promoter and full coding gene did not reveal any mutations. Cyproconazole, which has three nitrogen atoms in the aromatic ring, coordinated to the iron atom of heme through a hydrogen bond contact to residue Lys147 present in the active site of the A. fumigates Cyp51 homology model.
CONCLUSION: Cyproconazole is being applied extensively in wheat farms in Iran. According to the results, cyproconazole may not play a key role in the induction of azole resistance in the isolates through the environmental route. However, the potential ability of the fungicide to induce medically triazole-resistant strains over a long period of application should not be neglected.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2020 |
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| Erschienen: |
2020 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:6 |
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| Enthalten in: |
Current medical mycology - 6(2020), 4 vom: 25. Dez., Seite 14-19 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Moazeni, Maryam [VerfasserIn] |
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| Links: |
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| Themen: |
Aspergillus fumigatus |
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| Anmerkungen: |
Date Revised 24.04.2022 published: Print Citation Status PubMed-not-MEDLINE |
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| doi: |
10.18502/cmm.6.4.5329 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM327422262 |
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| 500 | |a Date Revised 24.04.2022 | ||
| 500 | |a published: Print | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a Copyright: © 2020, Published by Mazandaran University of Medical Sciences on behalf of Iranian Society of Medical Mycology and Invasive Fungi Research Center. | ||
| 520 | |a BACKGROUND AND PURPOSE: The present study aimed to evaluate the effect of cyproconazole, the most used fungicide in Iranian wheat farms, on the induction of voriconazole resistance in Aspergillus fumigatus isolates | ||
| 520 | |a MATERIALS AND METHODS: A collection of 20 clinical and environmental isolates were selected for investigation of the in vitro activity of fungicides. The minimum inhibitory concentrations (MICs) were determined by the documented broth microdilution method M38-A2 (CLSI, 2008). Induction experiments were performed and the possibly induced isolate(s) were subjected to antifungal susceptibility testing, sequencing of the CYP51A promoter, and full coding gene. Furthermore, CYP51-protein homology modeling and docking modes were evaluated using SWISS-MODEL (https://swissmodel.expasy.org/) and SEESAR software (version 9.1) | ||
| 520 | |a RESULTS: Among 10 susceptible isolates, only one strain showed a high MIC value against voriconazole (MIC=4µg/ml) after 25 passages. Nevertheless, sequencing of the CYP51A promoter and full coding gene did not reveal any mutations. Cyproconazole, which has three nitrogen atoms in the aromatic ring, coordinated to the iron atom of heme through a hydrogen bond contact to residue Lys147 present in the active site of the A. fumigates Cyp51 homology model | ||
| 520 | |a CONCLUSION: Cyproconazole is being applied extensively in wheat farms in Iran. According to the results, cyproconazole may not play a key role in the induction of azole resistance in the isolates through the environmental route. However, the potential ability of the fungicide to induce medically triazole-resistant strains over a long period of application should not be neglected | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Cyproconazole | |
| 650 | 4 | |a Fungicide | |
| 650 | 4 | |a Homology modeling | |
| 650 | 4 | |a Wheat | |
| 650 | 4 | |a Aspergillus fumigatus | |
| 700 | 1 | |a Ghobahi Katomjani, Elahe |e verfasserin |4 aut | |
| 700 | 1 | |a Haghani, Iman |e verfasserin |4 aut | |
| 700 | 1 | |a Nabili, Mojtaba |e verfasserin |4 aut | |
| 700 | 1 | |a Badali, Hamid |e verfasserin |4 aut | |
| 700 | 1 | |a Hedayati, Mohammad Taghi |e verfasserin |4 aut | |
| 700 | 1 | |a Shokohi, Tahereh |e verfasserin |4 aut | |
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