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Co-Occurrence of the mcr-1.1 and mcr-3.7 Genes in a Multidrug-Resistant Escherichia coli Isolate from China

OBJECTIVE: A colistin-resistant Escherichia coli strain isolated from dog feces was characterized in this study. METHODS AND RESULTS: A multiplex PCR assay was used to detect the presence of colistin-resistant mcr genes; it was found that E. coli QDFD216 co-harbored the mcr-1 and mcr-3 genes. Whole-...

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Detalles Bibliográficos
Autores principales: Du, Chongtao, Feng, Yuyang, Wang, Guizhen, Zhang, Zhiyuan, Hu, Huimin, Yu, Yu, Liu, Jiayang, Qiu, Lihao, Liu, Hongtao, Guo, Zhimin, Huang, Jing, Qiu, Jiazhang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Dove 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7585518/
https://www.ncbi.nlm.nih.gov/pubmed/33116684
http://dx.doi.org/10.2147/IDR.S268787
Descripción
Sumario:OBJECTIVE: A colistin-resistant Escherichia coli strain isolated from dog feces was characterized in this study. METHODS AND RESULTS: A multiplex PCR assay was used to detect the presence of colistin-resistant mcr genes; it was found that E. coli QDFD216 co-harbored the mcr-1 and mcr-3 genes. Whole-genome sequencing and further bioinformatics analysis revealed that E. coli QDFD216 belonged to serotype O176:H11, fimH1311 type and ST132. The resistance genes bla(CTX-M-14), mdfA, dfrA3, acrA, acrB, tolc, and sul3 were present in the chromosome. The mcr-1.1 and mcr-3.7 genes were located in two plasmids of different incompatibility groups. mcr-1.1 was carried by a IncX4-type plasmid within an typical IS26-parA-mcr-1.1-pap2 cassette, while mcr-3.7 was encoded by an IncP1-type plasmid with a genetic structure of TnAs2-mcr-3.7-dgkA-IS26. No additional antibiotic resistance genes were carried by either plasmid. CONCLUSION: This is the first report of an E. coli isolate co-harboring a mcr-1.1-carrying IncX4 plasmid and a mcr-3.7-carrying IncP1 plasmid. The evolution and mechanism of mcr gene co-existence need further study to assess its impact on public health.