Lyme Disease (LD) continues to be a serious health problem in the USA. The chronic nature of the infection can lead to debilitating and serious clinical manifestations. While early diagnosis of LD is the key to successful treatment, accurate diagnosis continues to be a significant problem. In addition, while a vaccine has been developed and licensed there are concerns about the duration of protection it affords and about possible autoimmune responses (IR) in certain genetic backgrounds. These concerns highlight the need for a better understanding of the genetic and antigenic properties of this organism and the molecular mechanisms associated with chronic infection. Our studies on chronic infection and immune evasion by B. burgdorferi (Bb) have focused on a diverse group of plasmid-carried genes and operons that are 5'-flanked by a common upstream promoter-carrying sequence that we call the upstream homology box or UHB element. UHB-flanked genes are organized into 3 distinct gene families: the ospE family, the ospF family, and family 163 (a TIGR designation). The data described below demonstrate that the ospE gene family undergoes mutational and recombinational changes during infection. In addition, members of the ospF gene family are temporally expressed during infection. These different processes culminate in the presentation of new antigenic variants of OspE and OspF on the cell surface that can contribute to immune evasion. Little is known about the role of other UHB-flanked gene families in chronic infection and immune evasion. However, the polymorphic nature of these genes suggests that their organization has been influenced by recent molecular events that may include recombination and rearrangement. The major hypotheses of this proposal are that the OspE, OspF and family 163 proteins contribute to immune evasion in LD and play stage specific roles during infection. The analyses described within will also test the utility of these proteins in vaccine development.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI037787-09
Application #
6846312
Study Section
Bacteriology and Mycology Subcommittee 2 (BM)
Program Officer
Baker, Phillip J
Project Start
1996-06-15
Project End
2007-02-28
Budget Start
2005-03-01
Budget End
2006-02-28
Support Year
9
Fiscal Year
2005
Total Cost
$362,980
Indirect Cost
Name
Virginia Commonwealth University
Department
Microbiology/Immun/Virology
Type
Schools of Medicine
DUNS #
105300446
City
Richmond
State
VA
Country
United States
Zip Code
23298
Fine, Lindy M; Miller, Daniel P; Mallory, Katherine L et al. (2014) The Borrelia hermsii factor H binding protein FhbA is not required for infectivity in mice or for resistance to human complement in vitro. Infect Immun 82:3324-32
Kostick, Jessica L; Szkotnicki, Lee T; Rogers, Elizabeth A et al. (2011) The diguanylate cyclase, Rrp1, regulates critical steps in the enzootic cycle of the Lyme disease spirochetes. Mol Microbiol 81:219-31
Marconi, Richard T; McDowell, John V (2011) Tick salivary proteins offer the lyme disease spirochetes an easy ride and another way to hide. Cell Host Microbe 10:95-6
Freedman, John C; Rogers, Elizabeth A; Kostick, Jessica L et al. (2010) Identification and molecular characterization of a cyclic-di-GMP effector protein, PlzA (BB0733): additional evidence for the existence of a functional cyclic-di-GMP regulatory network in the Lyme disease spirochete, Borrelia burgdorferi. FEMS Immunol Med Microbiol 58:285-94
Caswell, Clayton C; Han, Runlin; Hovis, Kelley M et al. (2008) The Scl1 protein of M6-type group A Streptococcus binds the human complement regulatory protein, factor H, and inhibits the alternative pathway of complement. Mol Microbiol 67:584-96
McDowell, John V; Harlin, Matthew E; Rogers, Elizabeth A et al. (2005) Putative coiled-coil structural elements of the BBA68 protein of Lyme disease spirochetes are required for formation of its factor H binding site. J Bacteriol 187:1317-23
McDowell, John V; Wolfgang, Jill; Senty, Lauren et al. (2004) Demonstration of the involvement of outer surface protein E coiled coil structural domains and higher order structural elements in the binding of infection-induced antibody and the complement-regulatory protein, factor H. J Immunol 173:7471-80
McDowell, John V; Wolfgang, Jill; Tran, Emily et al. (2003) Comprehensive analysis of the factor h binding capabilities of borrelia species associated with lyme disease: delineation of two distinct classes of factor h binding proteins. Infect Immun 71:3597-602
Metts, Michael S; McDowell, John V; Theisen, Michael et al. (2003) Analysis of the OspE determinants involved in binding of factor H and OspE-targeting antibodies elicited during Borrelia burgdorferi infection in mice. Infect Immun 71:3587-96