1887

Abstract

Acquisition of virulence genes encoded on mobile genetic elements has played an important role in the emergence of pathogenic isolates of , the causative agent of the diarrhoeal disease cholera. The genes encoding cholera toxin (), the main cause of profuse secretory diarrhoea in cholera, are encoded on a filamentous bacteriophage CTXϕ. The toxin coregulated pilus (TCP), an essential intestinal colonization factor, was originally designated as part of a pathogenicity island named the pathogenicity island (VPI), but this island has more recently been proposed to be the genome of a filamentous phage, VPIϕ. In this study, it is shown that , which encodes neuraminidase, maps within a novel pathogenicity island designated VPI-2. The 573 kb VPI-2 has all of the characteristic features of a pathogenicity island, including the presence of a bacteriophage-like integrase (), insertion in a tRNA gene (serine) and the presence of direct repeats at the chromosomal integration sites. Additionally, the G+C content of VPI-2 (42 mol%) is considerably lower than that of the entire genome (47 mol%). VPI-2 encodes several gene clusters, such as a restriction modification system ( and ) and genes required for the utilization of amino sugars (- region) as well as neuraminidase. To determine the distribution of VPI-2 among , 78 natural isolates were examined using PCR and Southern hybridization analysis for the presence of this region. All toxigenic O1 serogroup isolates examined contained VPI-2, whereas non-toxigenic isolates lacked the island. Of 14 O139 serogroup isolates examined, only one strain, MO2, contained the entire 573 kb island, whereas 13 O139 isolates contained only a 200 kb region with most of the 5′ region of VPI-2 which included deleted in these strains.

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2002-11-01
2020-04-08
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