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• W2796373860 abstract "Single-nucleotide polymorphisms related to fluoroquinolone and aminoglycoside resistance in Mycobacterium avium isolates Hui Pang,1,2 Kanglin Wan,3 Lin Wei1 1Department of Immunology, Hebei Medical University, Shijiazhuang, Hebei, China; 2Department of Immunology, Changzhi Medical College, Changzhi, Shanxi, China; 3State Key Laboratory for Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China Objective: The relationships between fluoroquinolone and aminoglycoside resistance and single-nucleotide polymorphisms (SNPs) in gyrA, gyrB, and rpsL genes were investigated in 95 clinical isolates of Mycobacterium avium from China. Methods: Fluoroquinolone and aminoglycoside resistance were determined by the broth microdilution method. GyrA, gyrB, and rpsL were sequenced, SNPs were identified, and the corresponding amino acid mutations were recorded.Results: The M. avium isolates displayed high levels of ofloxacin (93.68%), ciprofloxacin (92.63%), and streptomycin (65.26%) resistance. Moxifloxacin (18.95%) and amikacin (2.11%) were highly active against the strains. Fluoroquinolone resistance involving gyrA and gyrB gene mutations was identified. For gyrA, the most frequent SNPs were T→C (71/95, 74.74%), followed by A→G (64/95, 67.37%) and T→C (62/95, 65.26%). The amino acid mutations occurred mainly at Gly2444Asp (GGT→GAT) (20/95, 21.05%), Ala2445Ser (GCC→TCC) (20/95, 21.05%), Ala2447Val (GCC→GTC) (20/95, 21.05%), Val2449Ile (GTC→ATC) (20/95, 21.05%), and Glu2450Gln (GAA→CAA) (20/95, 21.05%). Prominent SNPs in gyrB included A→C (69/95, 72.63%), C→T (51/95, 53.68%), and T→G (29/95, 30.53%), and their amino acid substitutions were Ile2160Val (ATT→GTT) (21/95, 22.11%), Ile2160Met (ATT→ATG) (20/95, 21.05%), and Ile2273Leu (ATC→CTC) (11/95, 11.58%). Among the strains with aminoglycoside resistance, SNPs in rpsL were identified mostly at position G→A (73/95, 76.84%). G→C (21/95, 22.11%) was commonly seen. The amino acid mutations primarily involved Ala1539985Thr (GCC→ACC) (19/95, 20.00%), His1539992Asp (CAC→GAC) (19/95, 20.00%), and Gln1539983Glu (CAG→GAG) (18/95, 18.95%).Conclusion: Our study provides valuable information that could be used for the future diagnosis and treatment of M. avium disease.Keywords: Mycobacterium avium, drug resistance, single-nucleotide polymorphism, amino acid mutation, minimum inhibitory concentration" @default.
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• W2796373860 date "2018-04-01" @default.
• W2796373860 modified "2023-09-25" @default.
• W2796373860 title "Single-nucleotide polymorphisms related to fluoroquinolone and aminoglycoside resistance in <em>Mycobacterium avium</em> isolates" @default.
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• W2796373860 doi "https://doi.org/10.2147/idr.s160899" @default.
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