Journal of Molecular Evolution

, Volume 57, Issue 3, pp 309–324

Intra- and Interbacterial Genetic Exchange of Lyme Disease Spirochete erp Genes Generates Sequence Identity Amidst Diversity

Article

Abstract

All isolates of the spirochete Borreliaburgdorferi contain multiple, different plasmids of the cp32 family, each of which contains a locus encoding Erp surface proteins. Many of these proteins are known to bind host complement regulatory factor H, enabling the bacteria to avoid killing by the alternative complement pathway during vertebrate infection. In the present study, we characterized the erp loci and cp32 plasmids of strains N40, Sh-2-82, and 297 and compared them to the previously determined cp32 sequences of type strain B31. Bacteria of strain N40 contain 6 different cp32s, those of Sh-2-82 contain 10, and 297 bacteria contain 9 cp32s. Significant conservation between all strains was noted for the cp32 loci responsible for plasmid maintenance, indicating close relationships that appear to correspond with incompatibility groups. In contrast, considerable diversity was found between erp gene sequences, both within individual bacteria and between different strains. However, examples of identities among erp loci were found, with strains Sh-2-82, 297, and B31 each containing three identical loci that likely arose through intrabacterial genetic rearrangements. These studies also found the first evidence of large-scale genetic exchanges between Lyme disease spirochetes in nature, including the apparent transfer of an entire cp32 plasmid between two different bacteria.

Keywords

Borrelia burgdorferi Factor H OspE-related protein cp32 Plasmid Lyme disease 

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Copyright information

© Springer-Verlag New York Inc. 2003

Authors and Affiliations

  1. 1.Department of MicrobiologyImmunology, and Molecular Genetics, MS415 Chandler Medical Center, University of Kentucky College of Medicine, Lexington, KY 40536-0298USA

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