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- Title
First Report of aac(6′)-Ib and aac(6′)-Ib-cr Variant Genes Associated with Mutations in gyrA Encoded Fluoroquinolone Resistance in Avian Campylobacter coli Strains Collected in Tunisia.
- Authors
Gharbi, Manel; Abbas, Mohammed Abdo Saghir; Hamrouni, Safa; Maaroufi, Abderrazak
- Abstract
The aac(6′)-Ib gene is the most widespread gene encoding aminoglycoside-modifying enzyme and conferring resistance to tobramycin, streptomycin and kanamycin. The variant aac(6′)-Ib-cr gene confers resistance to both aminoglycosides and fluoroquinolones (FQ). A total of 132 Campylobacter isolates, including 91 C. jejuni and 41 C. coli, were selected from broiler hens isolates. The aac(6′)-Ib gene was amplified using PCR and was subsequently digested with the BtsCI restriction enzyme to identify aac(6′)-Ib-cr. Among these isolates, 31 out of 41 C. coli (75.6%) and 1 (0.98%) C. jejuni were positive for the aac(6′)-Ib gene, which was identified as the aac(6′)-Ib-cr variant in 10 (32.25%) C. coli isolates. This variant was correlated with mutations in gyrA (Thr-86-Ile), as well as resistance to FQs. This study is the first report in Tunisia on Campylobacter coli strains harboring both the aac(6′)-Ib and aac(6′)-Ib-cr variants. These genes were present in Campylobacter isolates exhibiting resistance to multiple antibiotics, which restricts the range of available treatments.
- Subjects
TUNISIA; CAMPYLOBACTER coli; GENETIC variation; GENETIC mutation; CAMPYLOBACTER; TOBRAMYCIN
- Publication
International Journal of Molecular Sciences, 2023, Vol 24, Issue 22, p16116
- ISSN
1661-6596
- Publication type
Article
- DOI
10.3390/ijms242216116