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Detection of mcr-1 Plasmids in Enterobacteriaceae Isolates From Human Specimens: Comparison With Those in Escherichia coli Isolates From Livestock in Korea

 Eun-Jeong Yoon  ;  Jun Sung Hong  ;  Ji Woo Yang  ;  Kwang Jun Lee  ;  Hyukmin Lee  ;  Seok Hoon Jeong 
 Annals of Laboratory Medicine, Vol.38(6) : 555-562, 2018 
Journal Title
 Annals of Laboratory Medicine 
Issue Date
Animals ; Anti-Bacterial Agents/pharmacology ; Bacterial Proteins/analysis* ; Bacterial Proteins/genetics ; Chickens ; Colistin/pharmacology ; Drug Resistance, Bacterial/genetics ; Enterobacteriaceae/drug effects ; Enterobacteriaceae/genetics* ; Enterobacteriaceae/isolation & purification ; Enterobacteriaceae Infections/diagnosis ; Enterobacteriaceae Infections/microbiology ; Escherichia coli/genetics* ; Escherichia coli/isolation & purification ; Escherichia coli Proteins/analysis* ; Escherichia coli Proteins/genetics ; Humans ; Microbial Sensitivity Tests ; Plasmids/genetics ; Plasmids/metabolism* ; Republic of Korea ; Retrospective Studies ; Whole Genome Sequencing
Colistin resistance ; Enterobacteriaceae ; IncI2 plasmid ; mcr-1
BACKGROUND: The emerging mobile colistin resistance gene, mcr-1, is an ongoing worldwide concern and an evaluation of clinical isolates harboring this gene is required in Korea. We investigated mcr-1-possessing Enterobacteriaceae among Enterobacteriaceae strains isolated in Korea, and compared the genetic details of the plasmids with those in Escherichia coli isolates from livestock. METHODS: Among 9,396 Enterobacteriaceae clinical isolates collected between 2010 and 2015, 1,347 (14.3%) strains were resistant to colistin and those were screened for mcr-1 by PCR. Colistin minimum inhibitory concentrations (MICs) were determined by microdilution, and conjugal transfer of the mcr-1-harboring plasmids was assessed by direct mating. Whole genomes of three mcr-1-positive Enterobacteriaceae clinical isolates and 11 livestock-origin mcr-1-positive E. coli isolates were sequenced. RESULTS: Two E. coli and one Enterobacter aerogenes clinical isolates carried carried IncI2 plasmids harboring mcr-1, which conferred colistin resistance (E. coli MIC, 4 mg/L; E. aerogenes MIC, 32 mg/L). The strains possessed the complete conjugal machinery except for E. aerogenes harboring a truncated prepilin peptidase. The E. coli plasmid transferred more efficiently to E. coli than to Klebsiella pneumoniae or Enterobacter cloacae recipients. Among the three bacterial hosts, the colistin MIC was the highest for E. coli owing to the higher mcr-1-plasmid copy number and mcr-1 expression levels. Ten mcr-1-positive chicken-origin E. coli strains also possessed mcr-1-harboring IncI2 plasmids closely related to that in the clinical E. aerogenes isolate, and the remaining one porcine-origin E. coli possessed an mcr-1-harboring IncX4 plasmid. CONCLUSIONS: mcr-1-harboring IncI2 plasmids were identified in clinical Enterobacteriaceae isolates. These plasmids were closely associated with those in chicken-origin E. coli strains in Korea, supporting the concept of mcr-1 dissemination between humans and livestock.
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Yonsei Authors
이혁민(Lee, Hyuk Min) ORCID logo https://orcid.org/0000-0002-8523-4126
정석훈(Jeong, Seok Hoon) ORCID logo https://orcid.org/0000-0001-9290-897X
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