Abstract
Staphylococcus aureus is a global pathogen and is responsible for causing severe life-threatening infections. The current study was designed to investigate transcriptional expression of different core, regulatory, and accessory genes within vanB operon under differential exposure of vancomycin and teicoplanin. Four isolates selected for the study, were confirmed to harbour vanB gene in which three isolates showed MIC breakpoint above 16 µg/ml and one isolate above 8 µg/ml against vancomycin while teicoplanin showed higher MIC breakpoint as compared to vancomycin. Antibiotic susceptibility results showed that these isolates were susceptible towards imipenem and linezolid. Transcriptional expressional analysis of the core gene of vanB operon showed that expression of vanB is increased under vancomycin stress but is inversely proportional to increase in the concentration of the vancomycin while under teicoplanin stress the expression of vanB showed no significant pattern. Similar expressional pattern was found for vanH gene for both the glycopeptides. In case of vanX, expression was significantly increased at 1 µg/ml exposure of vancomycin, however, no pattern could be observed in case of teicoplanin stress. In case of regulatory gene, vanR, significant increase in expression was observed under vancomycin and teicoplanin stress of 1 µg/ml, however vanS, showed significant increase in the expression under 1 µg/ml of vancomycin. The accessory gene, vanY showed marginal increase in expression under both the antibiotic, while in case of vanW, the expressional pattern was found to be inversely proportional to the increasing antibiotic concentration.
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Acknowledgements
The authors would like to thank Council of Scientific and Industrial Research, Government of India [letter no. 27(0321)/17/EMR-II dated 12-04-2017] for providing financial support.
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The study was financially supported by CSIR project, Government of India [letter no. 27(0321)/17/EMR-II dated 12–04-2017].
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by MH, JW, KN, DB, KMS, DDC, AB. The first draft of the manuscript was written by MH and AB. All authors read and approved the final manuscript.
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The study was ethically approved by Institutional ethical committee Assam University Silchar vide resolution 3(Sl.no 5) in the meeting on 09.04.2018.
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Hazarika, M., Wangkheimayum, J., Nath, K. et al. Transcriptional Response of vanB Operon in Staphylococcus aureus Against Vancomycin and Teicoplanin Stress. Curr Microbiol 80, 275 (2023). https://doi.org/10.1007/s00284-023-03389-8
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DOI: https://doi.org/10.1007/s00284-023-03389-8