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Lyme borreliosis, caused by the tick-borne bacterium Borrelia burgdorferi, has become the most common vector-borne disease in North America over the last three decades. To understand the dynamics of the epizootic spread and to predict the evolutionary trajectories of B. burgdorferi, accurate information on the population structure and the evolutionary relationships of the pathogen is crucial. We, therefore, developed a multilocus sequence typing (MLST) scheme for B. burgdorferi based on eight chromosomal housekeeping genes. We validated the MLST scheme on B. burgdorferi specimens from North America and Europe, comprising both cultured isolates and infected ticks. These data were compared with sequences for the commonly used genetic markers rrs-rrlA intergenic spacer (IGS) and the gene encoding the outer surface protein C (ospC). The study demonstrates that the concatenated sequences of the housekeeping genes of B. burgdorferi provide highly resolved phylogenetic signals and that the housekeeping genes evolve differently compared with the IGS locus and ospC. Using sequence data, the study reveals that North American and European populations of B. burgdorferi correspond to genetically distinct populations. Importantly, the MLST data suggest that B. burgdorferi originated in Europe rather than in North America as proposed previously.

Original publication

DOI

10.1073/pnas.0800323105

Type

Journal article

Journal

Proceedings of the National Academy of Sciences of the United States of America

Publication Date

23/06/2008

Volume

105

Pages

8730 - 8735

Addresses

Departments of Biology and Biochemistry and Mathematical Sciences, University of Bath, Bath BA2 7AY, United Kingdom. gm250@bath.ac.uk

Keywords

Borrelia burgdorferi, Lyme Disease, DNA, Bacterial, Sequence Analysis, DNA, Phylogeny, Genes, Bacterial, Genome, Bacterial, Molecular Sequence Data, North America, Europe, Genetic Variation