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Borrelia burgdorferi linear plasmid 38 is dispensable for completion of the mouse-tick infectious cycle.

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By Dulebohn DP, Bestor A, Rego RO, Stewart PE, Rosa PA • • September 1, 2011


Borrelia burgdorferi, the causative agent of Lyme disease, exists in a complex enzootic cycle, transiting between its vector, Ixodes ticks, and a diverse range of vertebrate hosts. B. burgdorferi linear plasmid 38 (lp38) contains several genes that are differentially regulated in response to conditions mimicking the tick or mouse environments, suggesting that these plasmid-borne genes may encode proteins important for the B. burgdorferi infectious cycle. Some of these genes encode potential virulence factors, including hypothetical lipoproteins as well as a putative membrane transport system. To characterize the role of lp38 in the B. burgdorferi infectious cycle, we constructed a shuttle vector to selectively displace lp38 from the B. burgdorferi genome and analyzed the resulting clones to confirm the loss of lp38. We found that, in vitro, clones lacking lp38 were similar to isogenic wild-type bacteria, both in growth rate and in antigenic protein production. We analyzed these strains in an experimental mouse-tick infectious cycle, and our results demonstrate that clones lacking lp38 are fully infectious in a mouse, can efficiently colonize the tick vector, and are readily transmitted to a naive host.

Infect Immun. 2011 Sep;79(9):3510-7. doi: 10.1128/IAI.05014-11. Epub 2011 Jun 27. Research Support, N.I.H., Intramural

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