Dataset Information

Molecular Analysis of a blaIMP-1-Harboring Class 3 Integron in Multidrug-Resistant Pseudomonas fulva.

ABSTRACT: A multidrug-resistant (MDR) Pseudomonas fulva strain was isolated in 2006 from a urine sample. The isolate harbored the blaIMP-1 gene, which was located in a chromosomal Tn402-like class 3 integron as a gene cassette array of aacA31-fosE-blaIMP-1 Two mutations in gyrA and one mutation in parC were detected in quinolone-resistance-determining regions (QRDRs). We report a full-length, novel, blaIMP-1-carrying class 3 integron. This integron, together with mutations in QRDRs, could have influenced the MDR phenotype.

SUBMITTER: Yamamoto M

PROVIDER: S-EPMC6105817 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature

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Publications

Molecular Analysis of a blaIMP-1-Harboring Class 3 Integron in Multidrug-Resistant Pseudomonas fulva.

Yamamoto Masaki M Matsumura Yasufumi Y Gomi Ryota R Matsuda Tomonari T Nakano Satoshi S Nagao Miki M Tanaka Michio M Ichiyama Satoshi S

Antimicrobial agents and chemotherapy 20180727 8

A multidrug-resistant (MDR) Pseudomonas fulva strain was isolated in 2006 from a urine sample. The isolate harbored the blaIMP-1 gene, which was located in a chromosomal Tn402-like class 3 integron as a gene cassette array of aacA31-fosE-blaIMP-1 Two mutations in gyrA and one mutation in parC were detected in quinolone-resistance-determining regions (QRDRs). We report a full-length, novel, blaIMP-1-carrying class 3 ...[more]

PMID: 29784850

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Project description:Diverse mobile genetic elements (MGEs) including plasmids, insertion sequences, and integrons play an important role in the occurrence and spread of multidrug resistance (MDR) in bacteria. It was found in previous studies that IS26 and class 1 integrons integrated on plasmids to speed the dissemination of antibiotic-resistance genes in Salmonella. It is aimed to figure out the patterns of specific genetic arrangements between IS26 and class 1 integrons located in plasmids in MDR Salmonella in this study. A total of 74 plasmid-harboring Salmonella isolates were screened for the presence of IS26 by PCR amplification, and 39 were IS26-positive. Among them, 37 isolates were resistant to at least one antibiotic. The thirty-seven antibiotic-resistant isolates were further involved in PCR detection of class 1 integrons and variable regions, and all were positive for class 1 integrons. Six IS26-class 1 integron arrangements with IS26 inserted into the upstream or downstream of class 1 integrons were characterized. Eight combinations of these IS26-class 1 integron arrangements were identified among 31 antibiotic-resistant isolates. Multidrug-resistance plasmids of the IncHI2 incompatibility group were dominant, which all belonged to ST3 by plasmid double locus sequence typing. These 21 IncHI2-positive isolates harbored six complex IS26-class 1 integron arrangement patterns. Conjugation assays and Southern blot hybridizations confirmed that conjugative multidrug-resistance IncHI2 plasmids harbored the different complex IS26-class 1 integron arrangements. The conjugation frequency of IncHI2 plasmids transferring alone was 10-5-10-6, reflecting that different complex IS26-class 1 integron arrangement patterns didn't significantly affect conjugation frequency (P > 0.05). These data suggested that class 1 integrons represent the hot spot for IS26 insertion, forming diverse MDR loci. And ST3-IncHI2 was the major plasmid lineage contributing to the horizontal transfer of composite IS26-class 1 integron MDR elements in Salmonella.

Dataset Information

Molecular Analysis of a blaIMP-1-Harboring Class 3 Integron in Multidrug-Resistant Pseudomonas fulva.

Publications

Molecular Analysis of a <i>bla</i><sub>IMP-1</sub>-Harboring Class 3 Integron in Multidrug-Resistant Pseudomonas fulva.

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