In-vitro study of ISApl1-mediated mobilization of the colistin resistance gene mcr-1 [PublishAheadOfPrint]

The plasmid-mediated mcr-1 gene encodes a phosphoethanolamine transferase conferring resistance to polymyxins. The mcr-1 gene is associated with insertion sequence ISApl1 (IS30 family). In-vitro mobilization assays demonstrated the functionality of the composite transposon structure ISApl1-mcr-1-ISApl1. Transposition generated a 2-bp duplication and occurred in AT-rich DNA regions. This is the first report demonstrating the mobility of the mcr-1 gene by transposition.

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