Molecular analysis of decorin-binding protein A (DbpA) reveals five major groups among European Borrelia burgdorferi sensu lato strains with impact for the development of serological assays and indicates lateral gene transfer of the dbpA gene

International Journal of Medical Microbiology : IJMM
U Schulte-SpechtelB Wilske

Abstract

The Borrelia (B.) burgdorferi adhesin DbpA (decorin-binding protein A) is a valuable antigen for serodiagnosis of Lyme borreliosis and a promising candidate for a vaccine. To investigate the heterogeneity of DbpA, we aligned DNA sequences of 83 different dbpA genes (37 from the database, where the majority of sequences belong to B. burgdorferi sensu stricto and 46 were newly sequenced). Analysis of 25 sequences from the species B. burgdorferi s.s., 16 from B. afzelii, 40 from B. garinii, and two from the recently described human pathogenic genospecies A14S revealed five distinct DbpA groups. Group I comprises B. burgdorferi s.s. and group II B. afzelii. B. garinii is divided into groups III and IV, whereas A14S strains form group V. Formation of groups is mainly due to insertions of whole sequence sections. Comparison of dbpA sequences with ospC sequences from a subset of 59 strains revealed all kinds of cross-connections indicating processes of lateral gene transfer among strains. The extent of sequence identity within the dbpA genes decreases from the DNA (67%) to the amino acid (AA) level (44%) by about 23%, in contrast ospC sequence identities differed only by about 10%. This might be an indication that DbpA plays an import...Continue Reading

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