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Journal of Clinical Microbiology, Nov 1997, 2752-2758, Vol 35, No. 11
D Roessler, U Hauser and B Wilske
The molecular and antigenic variabilities of BmpA (P39) among European
isolates of Borrelia burgdorferi were analyzed. The bmpA sequences of 12
isolates representing all three species of B. burgdorferi sensu lato
pathogenic for humans were amplified by PCR, cloned, and sequenced. The
BmpA protein of Borrelia garinii is heterogeneous, with an amino acid
sequence identity ranging from 91 to 97%, whereas the BmpA proteins of
Borrelia afzelii and B. burgdorferi sensu stricto strains appear to be
highly conserved (>98.5% intraspecies identity). The interspecies
identities ranged from 86 to 92%. Cluster analysis of BmpA reflected the
subdivision of B. burgdorferi sensu lato isolates into the three species as
well as a considerable heterogeneity among B. garinii strains. The BmpA
protein of each species of B. burgdorferi sensu lato was recombinantly
expressed in Escherichia coli, purified, and used to generate monoclonal
antibodies. Seven BmpA-specific antibodies were identified; six of them
recognized conserved epitopes of all three species, whereas one was
specific for BmpA of B. afzelii and B. garinii. A monoclonal antibody
(H1141) recommended by the Centers for Disease Control and Prevention for
use in the standardization of immunoblots showed strong reactivity with
BmpA of B. burgdorferi sensu stricto but no or only weak reactivity with
BmpA of B. garinii and B. afzelii, respectively. Sera from 86 European
patients with Lyme borreliosis in different stages and 73 controls were
tested in immunoglobulin G (IgG) and IgM immunoblots with the recombinant
BmpA proteins of the three species, revealing specificities of 98.6 to
100%. IgM antibodies against recombinant BmpA were only rarely detected
(1.1 to 8.1%). With the BmpA proteins of B. afzelii and B. garinii,
sensitivities for the IgG test (sera from stages I to III) were 36.0 and
34.9%, respectively, in contrast to 13.9% with BmpA of B. burgdorferi sensu
stricto. Therefore, we recommend that recombinant BmpA of B. afzelii or B.
garinii should be used solely, or in addition to B. burgdorferi sensu
stricto BmpA, in serodiagnostic tests for Lyme borreliosis in Europe.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Heterogeneity of BmpA (P39) among European isolates of Borrelia burgdorferi sensu lato and influence of interspecies variability on serodiagnosis [In Process Citation]
Max von Pettenkofer-Institut fur Hygiene und Medizinische Mikrobiologie der Ludwig-Maximilians Universitat Munchen, Lehrstuhl fur Bakteriologie, Munich, Germany. Roessler@mvp.med.uni-muenchen.de
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