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Authors: Zheng, Beiwen and Yu, Xiao and Xu, Hao and Guo, Lihua and Zhang, Jing and Huang, Chen and Shen, Ping and Jiang, Xiawei and Xiao, Yonghong and Li, Lanjuan

We previously described the discovery of two Escherichia coli isolates (EC1002 and EC2474) co-harbouring mcr-1 and bla NDM-1 genes, which were recovered from bloodstream infection in China. More importantly, these antibiotic resistance genes were located on different plasmids and signaling the potential spread of pandrug-resistant bacteria. Here, the complete genome sequences of both isolates were determined using Pacbio RS II and Illumina HiSeq2000 systems. The genome of EC1002 consists of a 5,177,501 base pair chromosome and four circular plasmids, while the genome of EC2474 consists of a 5,013,813 base pair chromosome and three plasmids. The plasmid replicon type of pEC1002_NDM and pEC2474_NDM were identified as IncA/C2 and IncF, respectively. The genetic environment of bla NDM-1 in this study was similar to bla NDM-carrying plasmids detected in China, although the overall nucleotide identity and query coverage were variable. The plasmid replicon type of pEC1002_MCR and pEC2474_MCR were identified as IncI2 and IncHI2, respectively. Two different genetic strategies for mcr-1 gene spread were observed in this study and bla NDM-1 genes were also found transferred by two different mobile genetic elements in two plasmids. The findings of this study further support that the diversified transfer mechanisms of bla NDM-1 and mcr-1 present in Enterobacteriaceae.

Journal: Scientific reports
DOI: 10.1038/s41598-017-18273-2
Year: 2017

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