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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Mutagenesis Induced by Sub-Lethal Doses of Ciprofloxacin: Genotypic and Phenotypic Differences Between the Pseudomonas aeruginosa Strain PA14 and Clinical Isolates

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Migliorini, Leticia Busato [1] ; Bruggemann, Holger [2] ; de Sales, Romario Oliveira [1] ; Mariko Koga, Paula Celia [3] ; de Souza, Andrea Vieira [1] ; Valle Martino, Marines Dalla [3] ; Galhardo, Rodrigo S. [4] ; Severino, Patricia [1]
Total Authors: 8
[1] Albert Einstein Res & Educ Inst, Hosp Israelita Albert Einstein, Sao Paulo - Brazil
[2] Aarhus Univ, Dept Biomed, Aarhus - Denmark
[3] Hosp Israelita Albert Einstein, Lab Clin, Sao Paulo - Brazil
[4] Univ Sao Paulo, Inst Ciencias Biomed, Dept Microbiol, Sao Paulo - Brazil
Total Affiliations: 4
Document type: Journal article
Source: FRONTIERS IN MICROBIOLOGY; v. 10, JUL 10 2019.
Web of Science Citations: 0

Bacterial resistance is a severe threat to global public health. Exposure to sub-lethal concentrations has been considered a major driver of mutagenesis leading to antibiotic resistance in clinical settings. Ciprofloxacin is broadly used to treat infections caused by Pseudomonas aeruginosa, whereas increased mutagenesis induced by sub-lethal concentrations of ciprofloxacin has been reported for the reference strain, PAO1, in vitro. In this study we report increased mutagenesis induced by sub-lethal concentrations of ciprofloxacin for another reference strain, PA14-UCBPP, and lower mutagenesis for clinical isolates when compared to the reference strain. This unexpected result may be associated with missense mutations in imuB and recX, involved in adaptive responses, and the presence of Pyocin S2, which were found in all clinical isolates but not in the reference strain genome. The genetic differences between clinical isolates of P. aeruginosa and the reference PA14-UCBPP, often used to study P. aeruginosa phenotypes in vitro, may be involved in reduced mutagenesis under sub-lethal concentrations of CIP, a scenario that should be further explored for the understanding of bacterial fitness in hospital environments. Moreover, we highlight the presence of a complete umuDC operon in a P. aeruginosa clinical isolate. Even though the presence of umuDC did not contribute to a significant increase in mutagenesis, it highlights the dynamic exchange of genetic material between bacterial species in the hospital environment. (AU)

FAPESP's process: 15/18886-0 - Role of DNA repair mechanisms in the response of Pseudomonas aeruginosa to antimicrobials ciprofloxacin and ceftazidime
Grantee:Letícia Busato Migliorini
Support Opportunities: Scholarships in Brazil - Master