Article (Scientific journals)
Correlation of antifungal susceptibility and sequence types within Cryptococcus neoformans VNI from HIV patients, and ERG11 gene polymorphism.
Bive, Bive Zono; Sacheli, Rosalie; Mudogo, Celestin Nzanzu et al.
2023In Journal de Mycologie Médicale, 33 (4), p. 101428
Peer reviewed
 

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Keywords :
Antifungal susceptibility; Cryptococcus neoformans; Democratic Republic of Congo; ERG11; EUCAST; Kinshasa; People living with HIV; Infectious Diseases
Abstract :
[en] [en] INTRODUCTION: Here we tested the correlation between minimum inhibitory concentrations (MICs) of major antifungal agents and sequence types (STs) within Cryptococcus neoformans VNI isolates, and explored the ERG11 gene of included strains. MATERIALS AND METHODS: We analysed 23 C. neoformans strains categorised into two groups according to the distribution of the ST profile in Kinshasa clinics (Democratic Republic of Congo): major ST [ST93 (n = 15)], and less common STs [ST659 (n = 2), ST5 (n = 2), ST4 (n = 1), ST 53 (n = 1), ST31 (n = 1), and ST69 (n = 1)]. The MICs of the major antifungal agents [amphotericin B (AMB), 5-fluorocytosine (5FC) and fluconazole (FCZ)] were determined following EUCAST guidelines. ERG11 gene sequences were extracted from whole genome sequence of the isolates and compared with the wild-type gene sequence of the C. neoformans VNI. RESULTS: Although major ST isolates appeared to have lower median MICs for AMB and 5FU than less common ST isolates (0.50 vs. 0.75 mg/L for AMB, 2 vs. 4 mg/L for 5FU, respectively), FCZ susceptibility was similar in both groups (4 mg/L) (p-value >0.05). The susceptibility profile of C. neoformans strains separately considered did not significantly affect the patients' clinical outcomes (p-value >0.05). Furthermore, two structural modalities of the ERG11 gene were observed: (1) that of the reference gene, and (2) that containing two exonic silent point substitutions, and one intronic point substitution located in a sequence potentially involved in pre-mRNA splicing (c.337-22C > T); with no association with the MICs of the isolates (p-value >0.05). CONCLUSIONS: The lack of association/correlation found in this study calls for further investigations to better understand the mechanisms of C. neoformans resistance to antifungal agents.
Disciplines :
Laboratory medicine & medical technology
Author, co-author :
Bive, Bive Zono ;  Molecular Biology Service, Department of Basic Sciences, Faculty of Medicine, University of Kinshasa, Kinshasa, Democratic Republic of the Congo, Department of Clinical Microbiology, National Reference Center for Mycosis, Center for Interdisciplinary Research on Medicines, University of Liege, Liege, Belgium. Electronic address: bive.zono@unikin.ac.cd
Sacheli, Rosalie  ;  Centre Hospitalier Universitaire de Liège - CHU > > Service de microbiologie clinique
Mudogo, Celestin Nzanzu ;  Molecular Biology Service, Department of Basic Sciences, Faculty of Medicine, University of Kinshasa, Kinshasa, Democratic Republic of the Congo
Zakayi, Pius Kabututu ;  Molecular Biology Service, Department of Basic Sciences, Faculty of Medicine, University of Kinshasa, Kinshasa, Democratic Republic of the Congo
Bontems, Sébastien  ;  Centre Hospitalier Universitaire de Liège - CHU > > Service de microbiologie clinique
Lelo, Georges Mvumbi ;  Molecular Biology Service, Department of Basic Sciences, Faculty of Medicine, University of Kinshasa, Kinshasa, Democratic Republic of the Congo
Hayette, Marie-Pierre  ;  Centre Hospitalier Universitaire de Liège - CHU > > Service de microbiologie clinique
Language :
English
Title :
Correlation of antifungal susceptibility and sequence types within Cryptococcus neoformans VNI from HIV patients, and ERG11 gene polymorphism.
Publication date :
25 August 2023
Journal title :
Journal de Mycologie Médicale
ISSN :
1156-5233
Publisher :
Elsevier Masson s.r.l., France
Volume :
33
Issue :
4
Pages :
101428
Peer reviewed :
Peer reviewed
Funding text :
We would like to thank the Académie de Recherche et d'Enseignement Supérieur (ARES-Belgium) for the support.
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since 21 October 2023

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