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Borrelia burgdorferi lacking DbpBA exhibits an early survival defect during experimental infection.

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By Weening EH, Parveen N, Trzeciakowski JP, Leong JM, Höök M, Skare JT • • December 1, 2008


Several Borrelia burgdorferi genes induced under mammalian host conditions have been purported to be important in Lyme disease pathogenesis based on their binding to host structures. These genes include the dbpBA locus, whose products bind host decorin and glycosoaminoglycans. Recently, the dbpBA genes were reported to be involved in borrelial infectivity. Here we extended the previous observations by using culture and quantitative PCR to evaluate low- and high-dose murine infection by a Delta dbpBA::Gent(r) derivative of B. burgdorferi strain B31. The results indicate that the Delta dbpBA::Gent(r) mutant is attenuated in the ability to initially colonize and then persist in multiple tissues. The mutant exhibited a colonization defect as early as 3 days postinfection, before the development of an adaptive immune response, and after low-dose infection of SCID mice, which are deficient in adaptive immunity. These findings suggest that the inability to adhere to host decorin may promote clearance of B. burgdorferi, presumably via innate immune mechanisms. In a high-dose infection, the mutant disseminated to several tissues, particularly joint tissue, but it was generally cleared from these tissues by 3 weeks postinfection. Finally, following high-dose infection of SCID mice, the dbpBA mutant exhibited only a mild colonization defect, suggesting that the adaptive response is involved in the clearance of the mutant in immunocompetent mice. Taken together, these results suggest that the DbpBA proteins facilitate the colonization of multiple tissues by B. burgdorferi and are required for optimal resistance to both innate and adaptive immune mechanisms following needle inoculation.

Infect Immun. 2008 Dec;76(12):5694-705. doi: 10.1128/IAI.00690-08. Epub 2008 Sep 22. Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't

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