Multiplex PCR for detection of plasmid-mediated colistin resistance determinants, mcr-1, mcr-2, mcr-3, mcr-4 and mcr-5 for surveillance purposes

Ana Rita Rebelo, Valeria Bortolaia, Jette S. Kjeldgaard, Susanne Karlsmose Pedersen, Pimlapas Leekitcharoenphon, Inge M. Hansen, Beatriz Guerra, Burkhard Malorny, Maria Borowiak, Jens Andre Hammerl, Antonio Battisti, Alessia Franco, Patricia Alba, Agnes Perrin-Guyomard, Sophie A. Granier, Cristina de Frutos, Escobar, Surbhi Malhotra-Kumar, Laura Villa, Alessandra CarattoliRene S. Hendriksen*

*Corresponding author for this work

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Background and aim: Plasmid-mediated colistin resistance mechanisms have been identified worldwide in the past years. A multiplex polymerase chain reaction (PCR) protocol for detection of all currently known transferable colistin resistance genes (mcr-1 to mcr-5, and variants) in Enterobacteriaceae was developed for surveillance or research purposes. Methods: We designed four new primer pairs to amplify mcr-1, mcr-2, mcr-3 and mcr-4 gene products and used the originally described primers for mcr-5 to obtain a stepwise separation of ca 200 bp between ampli-cons. The primer pairs and amplification conditions allow for single or multiple detection of all currently described mcr genes and their variants present in Enterobacteriaceae. The protocol was validated testing 49 European Escherichia coli and Salmonella isolates of animal origin. Results: Multiplex PCR results in bovine and porcine isolates from Spain, Germany, France and Italy showed full concordance with whole genome sequence data. The method was able to detect mcr-1, mcr-3 and mcr-4 as singletons or in different combinations as they were present in the test isolates. One new mcr-4 variant, mcr-4.3, was also identified. Conclusions: This method allows rapid identification of mcr-positive bacteria and overcomes the challenges of phenotypic detection of colistin resistance. The multiplex PCR should be particularly interesting in settings or laboratories with limited resources for performing genetic analysis as it provides information on the mechanism of colistin resistance without requiring genome sequencing.

Original languageEnglish
Article number17-00672
Issue number6
Number of pages11
Publication statusPublished - 8 Feb 2018


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