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Infection and Immunity, November 1998, p. 5275-5285, Vol. 66, No. 11
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Molecular Analysis of Sequence Heterogeneity among Genes Encoding Decorin Binding Proteins A and B of Borrelia burgdorferi Sensu Lato

William C. Roberts, Brian A. Mullikin, Raju Lathigra, and Mark S. Hanson*

MedImmune, Inc., Gaithersburg, Maryland 20878

Received 22 April 1998/Returned for modification 10 July 1998/Accepted 28 August 1998

Immunization of mice with Borrelia burgdorferi decorin binding protein A (DbpA), one of two gene products of the dbpBA locus, has been shown recently to confer protection against challenge. Hyperimmune DbpA antiserum killed a large number of B. burgdorferi sensu lato isolates of diverse phylogeny and origin, suggesting conservation of the protective epitope(s). In order to evaluate the heterogeneity of DbpA and DbpB and to facilitate defining the conserved epitope(s) of these antigens, the sequences of the dbpA genes from 29 B. burgdorferi sensu lato isolates and of the dbpB genes from 15 B. burgdorferi sensu lato isolates were determined. The predicted DbpA sequences were fairly heterogeneous among the isolates (58.3 to 100% similarity), but DbpA sequences with the highest similarity tended to group into species previously defined by well-characterized chromosomal markers. In contrast, the predicted DbpB sequences were highly conserved (96.3 to 100% similarity). Substantial diversity in DbpA sequence was seen among isolates previously shown to be killed by antiserum against a single DbpA, suggesting that one or more conserved protective epitopes are composed of noncontiguous amino acids. The observation of individual dbpA alleles with sequence elements characteristic of more than one B. burgdorferi sensu lato species was consistent with a role for genetic recombination in the generation of dbpA diversity.


* Corresponding author. Mailing address: MedImmune, Inc., 35 West Watkins Mill Road, Gaithersburg, MD 20878. Phone: (301) 527-4264. Fax: (301) 527-4200. E-mail: hansonm{at}medimmune.com.


Infection and Immunity, November 1998, p. 5275-5285, Vol. 66, No. 11
0019-9567/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.



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