Genetic and in-silico approaches for investigating the mechanisms of ciprofloxacin resistance in Salmonella typhi: Mutations, extrusion, and antimicrobial resistance
Abstract
Salmonella enterica serovar Typhi spreads typhoid infection in humans through the consumption of contaminated food and water. Poor sanitation plays a pivotal role in its dissemination. Over time, the bacterium has acquired resistance to many promising antibiotics, posing a growing global health concern and hindering the achievement of sustainable development goals. This study aims to elucidate the molecular complexity of fluoroquinolone resistance, a first-line treatment for typhoid infection. To achieve this aim, 80 clinical isolates were collected from various diagnostic laboratories. These isolates were confirmed based on morphological characteristics and biochemical tests. Multidrug-resistant (MDR) and extensively drug-resistant (XDR) isolates were identified using the Kirby-Bauer disc diffusion method. The mechanism of ciprofloxacin resistance was investigated by sequencing the quinolone resistance-determining region (QRDR) genes and identifying the presence of the qnrS1 gene. As a result of this study, 60 % of isolates showed resistance to ciprofloxacin. At the same time, the qnrS1 gene was present in all the selected strains while mutation analysis identified significant mutation in QRDR of DNA gyrase subunit A (gyrA ) and Topoisomerase IV ( parC ) gene. The combinatorial effect was further investigated by downloading 286 draft genomes. The Mutation analysis reveals significant mutations at gyrA S83F , gyrA D87N , gyrA S83Y , gyrB S464F , parC S80I , and parE L416F.…
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