Abstract:
Background:Bloodstream infection (BSI) caused by carbapenem-resistant Enterobacteriaceae are potentially life-threatening related to poorer outcomes. Colistin is considered one of the last-resort treatments against human infections caused by multidrug-resistant (MDR) Gram-negative bacteria. Therefore, emergence of strains from the blood that co-harboring mcr and carbapenem resistance genes were considered as a serious problem. Purpose:In this study, two mcr-9-harboring MDR Enterobacter cloacae isolates BSI034 and BSI072 recovered from BSI patients were identified, one of which co-harbored mcr-9 and blaNDM-1. The genetic characteristics of the MDR plasmid needed to be clarified. Methods:S1-PFGE and Southern blotting were conducted to determine the location of mcr-9. Whole-genome sequencing was performed to obtain the complete genome and plasmid sequences. The resistome and virulence genes of the strains, accompanied by the genetic characteristics of mcr-9- and blaNDM-1-harboring plasmids, were analyzed. Results:Whole-genome sequencing showed that BSI034 harbored mcr-9-carrying IncHI2-type pBSI034-MCR9 and blaNDM-1-carrying IncX3-type pBSI034-NDM1. The 278,517 bp pBSI034-MCR9 carried mcr-9 along with the other 19 resistance genes. mcr-9 was flanked by IS903B (1057 bp) and IS26 (820 bp) in the same orientation. In addition to resistance genes, strain BSI034 also carried a chromosome-located Yersinia high-pathogenicity island, which harbored genes of yersiniabactin biosynthesis operon ybtSXQPAUTE, irp1/2, and fyuA. Conclusion:We described the complete genome and mcr-9/blaNDM-1-co-harboring plasmid of E. cloacae from a BSI patient. Notable differences were observed within mosaic modules between pBSI034-MCR9 and other mcr-9-harboring plasmids due to extensive recombination via horizontal gene transfer.
journal_name
Infect Drug Resistjournal_title
Infection and drug resistanceauthors
Lin M,Yang Y,Yang Y,Chen G,He R,Wu Y,Zhong LL,El-Sayed Ahmed MAE,Feng S,Shen C,Wen X,Huang J,Li H,Zheng X,Tian GBdoi
10.2147/IDR.S248342subject
Has Abstractpub_date
2020-05-12 00:00:00pages
1397-1402issn
1178-6973pii
248342journal_volume
13pub_type
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journal_title:Infection and drug resistance
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abstract::[This corrects the article DOI: 10.2147/IDR.S258379.]. ...
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