{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,28]],"date-time":"2026-10-28T00:47:44Z","timestamp":1793148464347,"version":"4.5.0"},"reference-count":290,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2022,10,27]],"date-time":"2022-10-27T00:00:00Z","timestamp":1666828800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"the Chilean National Research and Development Agency, (ANID)","award":["1211950"],"award-info":[{"award-number":["1211950"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Antibiotics"],"abstract":"<jats:p>The disposal of antibiotics in the aquatic environment favors the selection of bacteria exhibiting antibiotic resistance mechanisms. Quinolones are bactericidal antimicrobials extensively used in both human and animal medicine. Some of the quinolone-resistance mechanisms are encoded by different bacterial genes, whereas others are the result of mutations in the enzymes on which those antibiotics act. The worldwide occurrence of quinolone resistance genes in aquatic environments has been widely reported, particularly in areas impacted by urban discharges. The most commonly reported quinolone resistance gene, qnr, encodes for the Qnr proteins that protect DNA gyrase and topoisomerase IV from quinolone activity. It is important to note that low-level resistance usually constitutes the first step in the development of high-level resistance, because bacteria carrying these genes have an adaptive advantage compared to the highly susceptible bacterial population in environments with low concentrations of this antimicrobial group. In addition, these genes can act additively with chromosomal mutations in the sequences of the target proteins of quinolones leading to high-level quinolone resistance. The occurrence of qnr genes in aquatic environments is most probably caused by the release of bacteria carrying these genes through anthropogenic pollution and maintained by the selective activity of antimicrobial residues discharged into these environments. This increase in the levels of quinolone resistance has consequences both in clinical settings and the wider aquatic environment, where there is an increased exposure risk to the general population, representing a significant threat to the efficacy of quinolone-based human and animal therapies. In this review the potential role of aquatic environments as reservoirs of the qnr genes, their activity in reducing the susceptibility to various quinolones, and the possible ways these genes contribute to the acquisition and spread of high-level resistance to quinolones will be discussed.<\/jats:p>","DOI":"10.3390\/antibiotics11111487","type":"journal-article","created":{"date-parts":[[2022,10,27]],"date-time":"2022-10-27T20:37:58Z","timestamp":1666903078000},"page":"1487","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":38,"title":["Aquatic Environments as Hotspots of Transferable Low-Level Quinolone Resistance and Their Potential Contribution to High-Level Quinolone Resistance"],"prefix":"10.3390","volume":"11","author":[{"given":"Claudio D.","family":"Miranda","sequence":"first","affiliation":[{"name":"Laboratorio de Patobiolog\u00eda Acu\u00e1tica, Departamento de Acuicultura, Universidad Cat\u00f3lica del Norte, Coquimbo 1780000, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christopher","family":"Concha","sequence":"additional","affiliation":[{"name":"Laboratorio de Patobiolog\u00eda Acu\u00e1tica, Departamento de Acuicultura, Universidad Cat\u00f3lica del Norte, Coquimbo 1780000, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"F\u00e9lix A.","family":"Godoy","sequence":"additional","affiliation":[{"name":"Centro i~mar, Universidad de Los Lagos, Puerto Montt 5480000, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9675-9908","authenticated-orcid":false,"given":"Matthew R.","family":"Lee","sequence":"additional","affiliation":[{"name":"Centro i~mar, Universidad de Los Lagos, Puerto Montt 5480000, Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,10,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"S24","DOI":"10.1086\/314056","article-title":"Mechanisms of action and resistance of older and newer fluoroquinolones","volume":"31","author":"Hooper","year":"2000","journal-title":"Clin. 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