Quinolone Resistance Genes qnr, aac(6')-Ib-cr, oqxAB, and qepA in Environmental Escherichia coli: Insights into Their Genetic Contexts from Comparative Genomics.

IF 3.3 3区生物学 Q2 ECOLOGY

Microbial Ecology Pub Date : 2025-02-17 DOI:10.1007/s00248-025-02502-7

Ryota Gomi, Fumie Adachi

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引用次数: 0

Abstract

Previous studies have reported the occurrence of transferable quinolone resistance determinants in environmental Escherichia coli. However, little is known about their vectors and genetic contexts. To gain insights into these genetic characteristics, we analyzed the complete genomes of 53 environmental E. coli isolates containing one or more transferable quinolone resistance determinants, including 20 sequenced in this study and 33 sourced from RefSeq. The studied genomes carried the following transferable quinolone resistance determinants alone or in combination: aac(6')-Ib-cr, oqxAB, qepA1, qnrA1, qnrB4, qnrB7, qnrB19, qnrD1, qnrS1, and qnrS2, with qnrS1 being predominant. These resistance genes were detected on plasmids of diverse replicon types; however, aac(6')-Ib-cr, qnrS1, and qnrS2 were also detected on the chromosome. The genetic contexts surrounding these genes included not only those found in clinical isolates but also novel contexts, such as qnrD1 embedded within a composite transposon-like structure bounded by Tn3-derived inverted-repeat miniature elements (TIMEs). This study provides deep insights into mobile genetic elements associated with transferable quinolone resistance determinants, highlighting the importance of genomic surveillance of antimicrobial-resistant bacteria in the environment.

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来源期刊

Microbial Ecology 生物-海洋与淡水生物学

CiteScore

6.90

自引率

2.80%

发文量

212

审稿时长

3-8 weeks

期刊介绍： The journal Microbial Ecology was founded more than 50 years ago by Dr. Ralph Mitchell, Gordon McKay Professor of Applied Biology at Harvard University in Cambridge, MA. The journal has evolved to become a premier location for the presentation of manuscripts that represent advances in the field of microbial ecology. The journal has become a dedicated international forum for the presentation of high-quality scientific investigations of how microorganisms interact with their environment, with each other and with their hosts. Microbial Ecology offers articles of original research in full paper and note formats, as well as brief reviews and topical position papers.