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Appl. Environ. Microbiol., 11 1996, 4060-4065, Vol 62, No. 11
F Kirstein and JS Gray
The efficacy of the mitochondrially encoded cytochrome b gene as a
molecular marker for the discrimination of the reservoir host species of
the Lyme borreliosis spirochete, Borrelia burgdorferi sensu lato (s.l.), in
its European vector Ixodes ricinus (Acari: Ixodidae) was determined.
Degenerate PCR primers were designed which amplified orthologous regions of
the cytochrome b gene in several animal species which act as B. burgdorferi
s.l. reservoirs and hosts for I. ricinus. PCR products were amplified and
characterized by hybridization and restriction fragment length polymorphism
analysis. Restriction fragment length polymorphism analysis of a 638-bp PCR
product with HaeIII and DdeI revealed unique restriction fragment profiles,
which allowed the taxonomic identification of animals to the genus level. A
system was devised for the detection of the larval host blood meal from the
remnants in unfed nymphal I. ricinus ticks by nested PCR amplification. An
inverse correlation was demonstrated between amplicon size and successful
PCR amplification of host DNA from the nymphal stage of the tick. The
stability of the cytochrome b product as a marker for the identification of
the larval host species in the nymphal instar was demonstrated up to 200
days after larval ingestion (approximately 165 days after molting) by
reverse line blotting with a host-specific probe. This assay has the
potential for the determination of the reservoir hosts of B. burgdorferi
s.l. by using extracts from the same individual ticks for both the
identification of the host species and the detection of the Lyme
borreliosis spirochete.
Copyright © 1996, American Society for Microbiology
A molecular marker for the identification of the zoonotic reservoirs of Lyme borreliosis by analysis of the blood meal in its European vector Ixodes ricinus
Environmental Resource Management, University College Dublin, Belfield, Ireland.
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