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Clinical and Diagnostic Laboratory Immunology, 01 1997, 60-63, Vol 4, No. 1
Copyright © 1997 by the American Society for Microbiology. All rights reserved.

PCR-restriction fragment length polymorphism analysis of the ospC gene for detection of mixed culture and for epidemiological typing of Borrelia burgdorferi sensu stricto

T Masuzawa, T Komikado and Y Yanagihara
Department of Microbiology, School of Pharmaceutical Sciences, University of Shizuoka, Japan. masuzawa@ys7.u-shizuoka-ken.ac.jp

Restriction fragment length polymorphism (RFLP) analysis of the outer surface protein C (ospC) gene amplicon was used for rapid screening for genetic variability within Borrelia burgdorferi sensu stricto species and for detection of multiple borreliae in culture. Primers for the ospC gene amplified a fragment of about 600 bp from Borrelia cultures. After cleavage of the amplified products by MboI and DraI, eight different RFLP types were found among 13 B. burgdorferi sensu stricto strains from various sources and geographical areas, and three RFLP types were found among 10 representative isolates from skin biopsy specimens taken from patients residing on the eastern end of Long Island, New York (B. W. Berger, R. C. Johnson, C. Kodner, and L. Coleman, J. Clin. Microbiol. 30:359-361, 1992). These results suggested that the DNA organization of B. burgdorferi sensu stricto is heterogeneous not only globally but also within a localized geographical area and that the ospC-based typing approach could differentiate the B. burgdorferi sensu stricto. From the results obtained using mixed cultures of two different RFLP types of B. burgdorferi sensu stricto, contamination of at least 0.5% of different types of Borrelia cells in culture could be detected. This method could detect a multiple-B. burgdorferi sensu stricto infection in the bladders of mice experimentally infected with two different RFLP type strains. The present study showed that RFLP analysis of ospC-PCR products is a reliable method for epidemiological typing of B. burgdorferi sensu stricto and could be used for rapid detection of mixed Borrelia culture and multiple B. burgdorferi sensu stricto infections in animals, ticks, and patients.

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