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Complete Genome Sequence of a Colistin-Susceptible Salmonella enterica Serovar Minnesota Strain Harboring mcr-9 on an IncHI2/IncHI2A Plasmid, Isolated from Chicken Meat

ABSTRACT: ABSTRACT The recent emergence and dissemination of mobilized colistin resistance (mcr) genes have triggered extensive concerns globally. Here, we report the complete genome sequence of a colistin-susceptible Salmonella enterica serotype Minnesota strain (named SA18578), belonging to sequence type 548 (ST548) and carrying the mcr-9 gene on an IncHI2/IncHI2A plasmid, that was isolated from chicken meat in Saudi Arabia in 2020.

SUBMITTER: Alzahrani K

PROVIDER: S-EPMC8582307 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:The purpose of this study was to investigate the occurrence of plasmid-mediated colistin resistance gene mcr-1 in Enterobacteriaceae isolates from companion animals in Guangzhou, China. Enterobacteriaceae isolated from 180 samples collected from cats and dogs were screened for mcr-1 by PCR and sequencing. MCR-1-producing isolates were further characterized by multilocus sequence typing and pulsed-field gel electrophoresis (PFGE). Plasmid characterization was performed by conjugation, replicon typing, S1-PFGE, and Southern blot hybridization. Plasmid pHN6DS2 as a representative IncN1-IncHI2/ST3 plasmid from ST93 E. coli was fully sequenced. pHN6DS2-like plasmids were screened by PCR-mapping and sequencing. The mcr-1 gene was detected in 6.25% (8/128) Escherichia coli isolates, of which, five belonged to E. coli ST93 and had identical PFGE patterns, resistance profiles and resistance genes. mcr-1 genes were located on ∼244.4 kb plasmids (n = 6), ∼70 kb plasmids, and ∼60 kb plasmids, respectively. Among them, five mcr-1-carrying plasmids were successfully transferred to recipient by conjugation experiments, and were classified as IncN1-IncHI2/ST3 (∼244.4 kb, n = 4, all obtained from E. coli ST93), and IncI2 (∼70 kb, n = 1), respectively. Plasmid pHN6DS2 contained a typical IncHI2-type backbone, with IncN1 segment (ΔrepA-Iterons I-gshB-ΔIS1294) inserted into the multiresistance region, and was similar to other mcr-1-carrying IncHI2/ST3 plasmids from Enterobacteriaceae isolates of various origins in China. The remaining five mcr-1-bearing plasmids with sizes of ∼244.4 kb were identified to be pHN6DS2-like plasmids. In conclusion, clonal spread of ST93 E. coli isolates was occurred in companion animals in Guangzhou, China.

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