alexa Genetic characteristics of blaNDM-1-positive plasmid in Citrobacter freundii isolate separated from a clinical infectious patient.
Pharmaceutical Sciences

Pharmaceutical Sciences

Advances in Pharmacoepidemiology and Drug Safety

Author(s): Du XX, Wang JF, Fu Y, Zhao F, Chen Y,

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Abstract This study reports an infectious case involving an (NDM-1)-producing Citrobacter freundii and further explored the potential threat of the bla(NDM-1) gene by analysing the characteristics of the (NDM-1)-encoding plasmid sequence. A bla(NDM-1)-positive C. freundii with high resistance to carbapenems was separated from a clinical patient suffering from a urinary tract infection. S1 nuclease-based plasmid analysis followed by Southern blot hybridization, a conjugation experiment and electrotransformation confirmed that the bla(NDM-1) gene was located on a plasmid. High-throughput sequencing of the bla(NDM-1)-positive plasmid (pCFNDM-CN) showed that it was a 54 kb IncX-type plasmid and contained a backbone region and a variable region with two β-lactamase genes (bla(NDM-1) and bla(SHV-12)). The NDM-1 composite transposon in the variable region was surrounded by IS26 and IS5-truncated ISAba125, and shared a high sequence similarity to the bla(NDM-1) surrounding structure in Acinetobacter spp. Our research suggested that the NDM-1 composite transposon might play an essential role in mobilization of the bla(NDM-1) gene from Acinetobacter spp. to Enterobacteriaceae. This article was published in J Med Microbiol and referenced in Advances in Pharmacoepidemiology and Drug Safety

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