Partial characterization of a genomic island associated with the multidrug resistance region of Salmonella enterica Typhymurium DT104.
This study describes the identification of the insertion site and partial characterization of a 43-kb region harboring the genes associated with the penta-resistant phenotype of a Canadian isolate of Salmonella enterica Typhymurium DT104 labelled 96-5227. The 43-kb fragment, here referred to as Salmonella genomic island I (SgiI), was found in the genome of S. enterica Typhymurium between the thdf and a prophage CP-4-like integrase (int2) gene and is flanked by an imperfect 18-bp direct repeat. A region downstream of sulI in the right end of SgiI contained four open reading frames which includes an IS6100 element, and a 2-kb region from the left end contained two open reading frames which showed homology to an integrase and an excisionase. Furthermore, a 1.9-kb retron sequence located between int2 and yidY was identified which may be unique to the S. enterica Typhymurium genome. The int-retron sequence is flanked by a 27-bp imperfect direct repeat.
Boyd
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Bureau of Microbiology, Laboratory Centre for Disease Control, Health Canada, 1015 Arlington St., Winnipeg, Manitoba, Canada R3E 3R2
Peters
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GA
Ng
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Mulvey
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D001483:Base Sequence; D018432:Drug Resistance, Multiple / Q000235:genetics*; D005798:Genes, Bacterial; D016680:Genome, Bacterial; D008969:Molecular Sequence Data; D012486:Salmonella typhimurium / Q000235:genetics*