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Journal of Bacteriology, September 2006, p. 6124-6134, Vol. 188, No. 17
0021-9193/06/$08.00+0     doi:10.1128/JB.00459-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Comparative Genome Hybridization Reveals Substantial Variation among Clinical Isolates of Borrelia burgdorferi Sensu Stricto with Different Pathogenic Properties

Darya Terekhova,1 Radha Iyer,1 Gary P. Wormser,2 and Ira Schwartz1,2*

Departments of Microbiology and Immunology,1 Division of Infectious Diseases, Department of Medicine, New York Medical College, Valhalla, New York 105952

Received 3 April 2006/ Accepted 16 June 2006

Clinical and murine studies suggest that there is a differential pathogenicity of different genotypes of Borrelia burgdorferi, the spirochetal agent of Lyme disease. Comparative genome hybridization was used to explore the relationship between different genotypes. The chromosomes of all studied isolates were highly conserved (>93%) with respect to both sequence and gene order. Plasmid sequences were substantially more diverse. Plasmids lp54, cp26, and cp32 were present in all tested isolates, and their sequences and gene order were conserved. The majority of linear plasmids showed variation both in terms of presence among different isolates and in terms of sequence and gene order. The data strongly imply that all B. burgdorferi clinical isolates contain linear plasmids related to each other, but the structure of these replicons may vary substantially from isolate to isolate. These alterations include deletions and presumed rearrangements that are likely to result in unique plasmid elements in many isolates. There is a strong correlation between complete genome hybridization profiles and other typing methods, which, in turn, also correlate to differences in pathogenicity. Because there is substantially less variation in the chromosomal and circular plasmid portions of the genome, the major differences in open reading frame content and genomic diversity among isolates are linear plasmid driven.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, New York Medical College, BSB Room 308, Valhalla, NY 10595. Phone: (914) 594-4658. Fax: (914) 594-4176. E-mail: schwartz{at}nymc.edu.

Journal of Bacteriology, September 2006, p. 6124-6134, Vol. 188, No. 17
0021-9193/06/$08.00+0     doi:10.1128/JB.00459-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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