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Microbiology 150 (2004), 4053-4063; DOI  10.1099/mic.0.27172-0
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Microbiology 150 (2004), 4053-4063; DOI  10.1099/mic.0.27172-0
© 2004 Society for General Microbiology

The Vibrio seventh pandemic island-II is a 26·9 kb genomic island present in Vibrio cholerae El Tor and O139 serogroup isolates that shows homology to a 43·4 kb genomic island in V. vulnificus

Yvonne A. O'Shea, Shirley Finnan, F. Jerry Reen, John P. Morrissey, Fergal O'Gara and E. Fidelma Boyd

Department of Microbiology, UCC, National University of Ireland, Cork, Ireland

Correspondence
E. Fidelma Boyd
f.boyd{at}ucc.ie

Vibrio cholerae is the aetiological agent of the deadly diarrhoeal disease cholera. In this study the 7·5 kb Vibrio seventh pandemic island-II (VSP-II) that is unique to V. cholerae El Tor and O139 serogroups was analysed and it was found to be part of a novel 26·9 kb genomic island (GEI) encompassing VC0490–VC0516. The low-GC-content VSP-II encompassed 24 predicted ORFs, including DNA repair and methyl-accepting chemotaxis proteins, a group of hypothetical proteins and a bacteriophage-like integrase adjacent to a tRNA gene. Interestingly, V. cholerae ORFs VC0493–VC0498, VC0504–VC0510 and VC0516, which encodes an integrase, were homologous to Vibrio vulnificus strain YJ016 ORFs VV0510–VV0516, VV0518–VV0525 and VV0560, which also encodes an integrase, respectively. Some ORFs showed amino acid identities greater than 90 % between the two species in these regions. In V. vulnificus strain YJ016, a 43·4 kb low-GC-content (43 %) GEI encompassing ORFs VV0509–VV0560 was identified and named V. vulnificus island-I (VVI-I). The 52 ORFs of VVI-I included a phosphotransferase system gene cluster, genes required for sugar metabolism and transposase genes. There was synteny and homology between the 5' region of V. cholerae VSP-II and the 5' region of V. vulnificus VVI-I; however, VVI-I contained an additional 31·5 kb of DNA between VV0526 and VV0560 in strain YJ016. A second V. vulnificus strain, CMCP6, did not contain the 43·4 kb VVI-I; in this strain two ORFs were found between the 5' and 3' flanking genes VV10636 and VV10632, showing 100 % identity to VV0508 and VV0561, respectively, which flank VVI-I.

Abbreviations: GEI, genomic island; VPI, Vibrio pathogenicity island; VSP-II, Vibrio seventh pandemic island-II; VVI-I, Vibrio vulnificus island-I




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