Expression and sequence diversity of the complement regulating outer surface protein E in Borrelia afzelii vs. Borrelia garinii in patients with erythema migrans or neuroborreliosis.
Outer surface protein E (OspE) is a complement factor H-binding virulence factor of borrelial subspecies. It is usually absent from in vitro grown Borrelia garinii, although in vivo B. garinii causes neuroborreliosis (NB). We analyzed the presence and sequence spectrum of the ospE genes in vivo in Borrelia spirochetes. DNA samples from the skin, serum and cerebrospinal fluid (CSF) of patients with infections caused by Borrelia afzelii or B. garinii were studied, and anti-OspE antibodies in the corresponding patient sera were detected by IgG ELISA using recombinant OspE as an antigen. ospE genes were found in 20 of 23 erythema migrans (EM) skin biopsies with B. afzelii, in 2 EM skin biopsies with unknown underlying subspecies, in 5 of 9 EM biopsies with B. garinii, and in 1 of 4 CSF samples of NB patients with B. garinii infection. All OspE sequences from B. garinii samples were identical. In contrast, OspE of B. afzelii origin showed more variation. Anti-OspE antibodies were found in 8/21 (38.0%) sera from patients with B. afzelii-associated EM. In conclusion, our results indicate that all borrelial subspecies, but not necessarily all strains, causing human infections can carry ospE genes to protect themselves against complement attack in vivo.
Panelius
Jaana
J
Haartman Institute, Department of Bacteriology and Immunology, P.O. Box 21, University of Helsinki, Helsinki, FIN-00014, Finland. jaana.panelius@helsinki.fi
Ranki
Annamari
A
Meri
Taru
T
Seppälä
Ilkka
I
Meri
Seppo
S
D000907:Antibodies, Bacterial / Q000097:blood; D001425:Bacterial Outer Membrane Proteins / Q000096:biosynthesis* / Q000235:genetics*; D001483:Base Sequence; D015748:Borrelia burgdorferi Group / Q000235:genetics* / Q000302:isolation & purification; D002555:Cerebrospinal Fluid / Q000382:microbiology; D003165:Complement System Proteins / Q000276:immunology; D004269:DNA, Bacterial / Q000302:isolation & purification; D004797:Enzyme-Linked Immunosorbent Assay; D015870:Gene Expression; D005929:Glossitis, Benign Migratory / Q000382:microbiology; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D020852:Lyme Neuroborreliosis / Q000382:microbiology*; D008969:Molecular Sequence Data; D011110:Polymorphism, Genetic; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D044967:Serum / Q000382:microbiology; D012867:Skin / Q000382:microbiology
D000907:Antibodies, Bacterial; D001425:Bacterial Outer Membrane Proteins; D004269:DNA, Bacterial; D007074:Immunoglobulin G; D003165:Complement System Proteins