Abstract
Multi-drug resistance in Salmonella Typhi remains a public health concern globally. This study aimed to investigate the function of quinolone resistance determining region (QRDR) of gyrA and parC in ciprofloxacin (CIP) resistant isolates and examine the differential expression of outer membrane proteins (OMPs) on exposure to sub-lethal concentrations of CIP in S. Typhi. The CIP-resistant isolates were screened for mutations in the QRDR and analyzed for bacterial growth. Furthermore, major OMPs encoding genes such as ompF, lamB, yaeT, tolC, ompS1, and phoE were examined for differential expression under the sub-lethal concentrations of CIP by real-time PCR and SDS-PAGE. Notably, our study has shown a single-point mutation in gyrA at codon 83 (Ser83-tyrosine and Ser83-phenylalanine), also the rare amino acid substitution in parC gene at codon 80 (Glu80-glycine) in CIP-resistant isolates. Additionally, CIP-resistant isolates showed moderate growth compared to susceptible isolates. Although most of the OMP-encoding genes (tolC, ompS1, and phoE) showed some degree of upregulation, a significant level of upregulation (p < 0.05) was observed only for yaeT. However, ompF and lamB genes were down-regulated compared to CIP-susceptible isolates. Whereas OMPs profiling using SDS-PAGE did not show any changes in the banding pattern. These results provide valuable information on the QRDR mutation, and the difference in the growth, and expression of OMP-encoding genes in resistant and susceptible isolates of S. Typhi. This further provides insight into the involvement of QRDR mutation and OMPs associated with CIP resistance in S. Typhi.
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Data availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request. The accession numbers of gene sequences of particular isolates are provided in Table 3.
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This study was supported by the Nitte (Deemed to be University) through the NUFR2 project (NUFR2/2018/10/25). The first author also acknowledges Nitte (Deemed to be University), Mangalore, for providing Ph.D. fellowship.
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SDA performed experiments, interpreted the results, analyzed the data, and wrote the manuscript. SN performed experiments. VKD designed the experiments, supervised, and reviewed the manuscript. AR provided Salmonella isolates, supervised, and reviewed the manuscript. BM conceptualized, designed the experiments, supervised, provided funds and resources, and reviewed the manuscript.
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Akshay, S.D., Nayak, S., Deekshit, V.K. et al. Differential expression of outer membrane proteins and quinolone resistance determining region mutations can lead to ciprofloxacin resistance in Salmonella Typhi. Arch Microbiol 205, 136 (2023). https://doi.org/10.1007/s00203-023-03485-0
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DOI: https://doi.org/10.1007/s00203-023-03485-0