title: Role of outer surface protein D in the Borrelia burgdorferi life cycle.
abstract: Borrelia burgdorferi preferentially induces selected genes in mice or ticks, and studies suggest that ospD is down-regulated in response to host-specific signals. We now directly show that ospD expression is generally elevated within Ixodes scapularis compared with mice. We then assessed the importance of OspD throughout the spirochete life cycle by generating OspD-deficient B. burgdorferi and examining the mutant in the murine model of tick-transmitted Lyme borreliosis. The lack of OspD did not influence B. burgdorferi infectivity in mice or the acquisition of spirochetes by I. scapularis. OspD adhered to tick gut extracts in vitro, and the OspD-deficient B. burgdorferi strain had a threefold decrease in colonization of the tick gut in vivo. This decrease, however, did not alter subsequent spirochete transmission during a second blood meal. These data suggest that B. burgdorferi can compensate for the lack of OspD in both ticks and mice and that OspD may have a nonessential, secondary, role in B. burgdorferi persistence within I. scapularis.
authors.affiliation: Section of Rheumatology, Department of Internal Medicine, Yale University School of Medicine, 300 Cedar Street, New Haven, CT 06520-8031, USA.
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.forename: Girish
authors.initials: G
authors.lastname: Neelakanta
authors.forename: Xianzhong
authors.initials: X
authors.lastname: Liu
authors.forename: Deborah S
authors.initials: DS
authors.lastname: Beck
authors.forename: Fred S
authors.initials: FS
authors.lastname: Kantor
authors.forename: Durland
authors.initials: D
authors.lastname: Fish
authors.forename: John F
authors.initials: JF
authors.lastname: Anderson
authors.forename: Erol
authors.initials: E
authors.lastname: Fikrig
mesh_terms: D000818:Animals; D001425:Bacterial Outer Membrane Proteins / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D025065:Borrelia burgdorferi / Q000235:genetics / Q000254:growth & development* / Q000502:physiology*; D004195:Disease Models, Animal; D005260:Female; D015964:Gene Expression Regulation, Bacterial; D006801:Humans; D018884:Ixodes / Q000382:microbiology*; D008193:Lyme Disease / Q000382:microbiology*; D051379:Mice; D008809:Mice, Inbred C3H; D009154:Mutation
chemical_list: D001425:Bacterial Outer Membrane Proteins; C077524:outer surface protein D, Borrelia burgdorferi