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1 Laboratory of Microbial Structure and Function, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, NIH, Hamilton, MT 59840, USA
2 Division of Molecular Biology and Genetics, Department of Oncological Sciences, University of Utah, Salt Lake City, UT 84132, USA
Author for correspondence: Brian Stevenson. Tel: + 1 606 323 8967. Fax: + 1 606 257 8994.
ABSTRACT
A single Borrelia burgdorferi bacterium may contain six or more different 32 kb circular plasmids (cp32s). Although these plasmids are homologous throughout much of their sequences, two loci have been identified at which they can vary significantly. The cp32 plasmids and their relatives each contain two adjacent genes, orfC and orf3, that vary in sequence between plasmids found within clones of individual bacteria. The orfC gene product is homologous to proteins involved in partitioning of bacterial plasmids, and the differences at this locus between plasmids may account for their compatibility. The orfC-orf3 loci are located approximately 5 kb from another variable locus called erp. The orfC-orf3 loci were used as physically linked markers to assess genetic rearrangements in the erp loci; this revealed examples of recombination involving both individual genes and entire erp loci. Recombination of the genes encoding the Erp antigens might contribute to the evasion of the mammalian immune response and could play roles in the establishment and persistence of B. burgdorferi infections in mammalian hosts.
Present address: Department of Microbiology and Immunology, MS 415 UKMC, University of Kentucky, Lexington, KY 40536, USA.
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