title: Genotype variation and capsular serotypes of Porphyromonas gingivalis from chronic periodontitis and periodontal abscesses.
abstract: Porphyromonas gingivalis is considered an important pathogen in periodontal disease. While this organism expresses a number of virulence factors, no study combining different virulence polymorphisms has, so far, been conducted. The occurrence of combined virulence (Cv) genotypes in 62 isolates of P. gingivalis was investigated from subjects displaying either chronic periodontitis or periodontal abscess. The Cv genotypes, based on gene variation of fimbriae (fimA), Lys-specific cystein proteinase (kgp) and Arg-specific cystein proteinase (prpR1/rgpA), were evaluated by PCR. The isolates were also subjected to capsular polysaccharide K-serotyping. A total of 18 Cv genotype variants based on fimA: kgp: rgpA were identified, of which II:I:A and II:II:A Cv genotypes (53.3%) were the two most frequently detected combinations. Moreover, 36% of the isolates were K-typeable, with the K6 serotype being the most prevalent (23%). Two isolates had the same genotype as the virulent strain W83. The results indicate that chronic periodontitis is not associated with a particularly virulent clonal type. A highly virulent genotype (e.g. strain W83) of P. gingivalis can be found in certain periodontitis patients.
authors: Department of Oral Microbioloy, Institute of Odontology, The Sahlgrenska Academy at Göteborg University, Göteborg, Sweden.
authors: Takashi
authors: T
authors: Yoshino
authors: Marja L
authors: ML
authors: Laine
authors: Arie Jan
authors: AJ
authors: van Winkelhoff
authors: Gunnar
authors: G
authors: Dahlén
mesh_terms: D002908:Chronic Disease; D003546:Cysteine Endopeptidases / Q000235:genetics; D036781:Fimbriae Proteins / Q000235:genetics; D005838:Genotype; D006801:Humans; D010508:Periodontal Abscess / Q000382:microbiology*; D010518:Periodontitis / Q000382:microbiology*; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D016966:Porphyromonas gingivalis / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification; D012703:Serotyping / Q000379:methods; D037521:Virulence Factors / Q000235:genetics
chemical_list: D037521:Virulence Factors; D036781:Fimbriae Proteins; D003546:Cysteine Endopeptidases