A single upstream mutation of <i>whiB7</i> underlies amikacin and clarithromycin resistance in <i>Mycobacterium abscessus</i>

De Boeck, Nathan ; Villellas, Cristina (Universidad de Zaragoza) ; Crespo-Yuste, Estefanía (Universidad de Zaragoza) ; Gonzalo-Asensio, Jesús (Universidad de Zaragoza) ; Buckley, Peter T ; Thys, Kim ; Vuong, Cuong ; Lounis, Nacer ; Verstraeten, Natalie ; Michiels, Jan

Resumen: Aims: We aimed to investigate the molecular mechanisms underlying the survival of Mycobacterium abscessus when faced with antibiotic combination therapy. By conducting evolution experiments and whole-genome sequencing (WGS), we sought to identify genetic variants associated with stress response mechanisms, with a particular focus on drug survival and resistance. Methods and results: We conducted evolution experiments on M. abscessus, exposing the bacteria to a combination therapy of amikacin and rifabutin. Genetic mutations associated with increased antibiotic survival and altered susceptibility were subsequently identified by WGS. We focused on mutations that contribute to stress response mechanisms and tolerance. Of particular interest was a novel frameshift mutation in MAB_3509c, a gene of unknown function within the upstream open reading frame of whiB7. A MAB_3509c knockout mutant was constructed, and expression of downstream drug resistance genes was assessed by RT-qPCR. Mutation of MAB_3509c results in increased RNA levels of whiB7 and downstream stress response genes such as eis2, which is responsible for aminoglycoside resistance. Conclusion: Our findings demonstrate the importance of whiB7 in the adaptive stress response in M. abscessus. Moreover, our results highlight the complexity of M. abscessus adapting to drug stress and underscore the need for further research.

Idioma: Inglés

DOI: 10.1093/jambio/lxae286

Año: 2024

Publicado en: Journal of Applied Microbiology 135, 11 (2024), lxae286 [13 pp.]
ISSN: 1364-5072

Factor impacto JCR: 3.2 (2024)

Categ. JCR: MICROBIOLOGY rank: 76 / 163 = 0.466 (2024) - Q2 - T2
Categ. JCR: BIOTECHNOLOGY & APPLIED MICROBIOLOGY rank: 75 / 177 = 0.424 (2024) - Q2 - T2

Factor impacto SCIMAGO: 0.779 - Applied Microbiology and Biotechnology (Q2) - Medicine (miscellaneous) (Q2) - Biotechnology (Q2)

Financiación: info:eu-repo/grantAgreement/ES/MICINN/AEI/PRE2020-096507
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2019-104690RB-I00

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Microbiología (Dpto. Microb.Ped.Radio.Sal.Pú.)