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Infection and Immunity, March 2004, p. 1537-1547, Vol. 72, No. 3
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.3.1537-1547.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

The Burkholderia cepacia Epidemic Strain Marker Is Part of a Novel Genomic Island Encoding Both Virulence and Metabolism-Associated Genes in Burkholderia cenocepacia

Adam Baldwin,1 Pamela A. Sokol,2 Julian Parkhill,3 and Eshwar Mahenthiralingam1*

Cardiff School of Biosciences, Cardiff University, Cardiff CF10 3TL, Wales,1 Pathogen Sequencing Unit, The Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SA, United Kingdom,3 Department of Microbiology and Infectious Diseases, University of Calgary, Calgary, Alberta, Canada TN2 4N12

Received 19 September 2003/ Returned for modification 23 October 2003/ Accepted 10 December 2003

The Burkholderia cepacia epidemic strain marker (BCESM) is a useful epidemiological marker for virulent B. cenocepacia strains that infect patients with cystic fibrosis. However, there was no evidence that the original marker, identified by random amplified polymorphic DNA fingerprinting, contributed to pathogenicity. Here we demonstrate that the BCESM is part of a novel genomic island encoding genes linked to both virulence and metabolism. The BCESM was present on a 31.7-kb low-GC-content island that encoded 35 predicted coding sequences (CDSs): an N-acyl homoserine lactone (AHL) synthase gene (cciI) and corresponding transcriptional regulator (cciR), representing the first time cell signaling genes have been found on a genomic island; fatty acid biosynthesis genes; an IS66 family transposase; transcriptional regulator CDSs; amino acid metabolism genes; and a group of hypothetical genes. Mutagenesis of the AHL synthase, amidase (amiI), and porin (opcI) genes on the island was carried out. Testing of the isogenic mutants in a rat model of chronic lung infection demonstrated that the amidase played a role in persistence, while the AHL synthase and porin were both involved in virulence. The island, designated the B. cenocepacia island (cci), is the first genomic island to be defined in the B. cepacia complex and its discovery validates the original epidemiological correlation of the BCESM with virulent CF strains. The features of the cci, which overlap both pathogenicity and metabolism, expand the concept of bacterial pathogenicity islands and illustrate the diversity of accessory functions that can be acquired by lateral gene transfer in bacteria.

* Corresponding author. Mailing address: Cardiff School of Biosciences, Cardiff University, Main Building, P.O. Box 915, Cardiff, Wales, United Kingdom. Phone: 44 (0)29 20875875. Fax: 44 (0)29 20874305. E-mail: MahenthiralingamE{at}cardiff.ac.uk.

Editor: J. T. Barbieri

Infection and Immunity, March 2004, p. 1537-1547, Vol. 72, No. 3
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.3.1537-1547.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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