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bptA (bbe16) is essential for the persistence of the Lyme disease spirochete, Borrelia burgdorferi, in its natural tick vector

AutorRevel, Andrew T.; Almazán, Consuelo; Kocan, Katherine M.; Fuente, José de la ; Norgard, Michael V.
Fecha de publicación28-abr-2005
EditorNational Academy of Sciences (U.S.)
CitaciónPNAS 102(19): 6972-6977 (2005)
ResumenBorrelia burgdorferi (Bb), the agent of Lyme disease, is a zoonotic spirochetal bacterium that depends on arthropod (Ixodes ticks) and mammalian (rodent) hosts for its persistence in nature. The quest to identify borrelial genes responsible for Bb's parasitic dependence on these two diverse hosts has been hampered by limitations in the ability to genetically manipulate virulent strains of Bb. Despite this constraint, we report herein the inactivation and genetic complementation of a linear plasmid-25-encoded gene (bbe16) to assess its role in the virulence, pathogenesis, and survival of Bb during its natural life cycle. bbe16 was found to potentiate the virulence of Bb in the murine model of Lyme borreliosis and was essential for the persistence of Bb in Ixodes scapularis ticks. As such, we have renamed bbe16 a gene encoding borrelial persistence in ticks (bpt)A. Although protease accessibility experiments suggested that BptA as a putative lipoprotein is surface-exposed on the outer membrane of Bb, the molecular mechanism(s) by which BptA promotes Bb persistence within its tick vector remains to be elucidated. BptA also was shown to be highly conserved (>88% similarity and >74% identity at the deduced amino acid levels) in all Bb sensu lato strains tested, suggesting that BptA may be widely used by Lyme borreliosis spirochetes for persistence in nature. Given Bb's absolute dependence on and intimate association with its arthropod and mammalian hosts, BptA should be considered a virulence factor critical for Bb's overall parasitic strategy.
Descripción6 pages.-- Open-access full-text paper via NIH-PubMed Central, PMCID: PMC1100799.-- Printed version published on May 10, 2005.-- Supplementary material (tables and figures) available at: http://www.pnas.org/content/102/19/6972/suppl/DC1.
Versión del editorhttp://dx.doi.org/10.1073/pnas.0502565102
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