title: Prevalence of Porphyromonas gingivalis fimA genotypes in Japanese children.
abstract: Porphyromonas gingivalis FimA fimbriae have been classified into 6 genotypes (types I-V and Ib) based on the diversity of the fimA genes encoding the fimbrial subunits. We investigated the prevalence of fimA genotype in Japanese children. Dental plaque specimens were obtained from 400 subjects (age; 2 to 15 years), including 134 with healthy gingiva, 239 with gingivitis and 27 with periodontitis, and then analyzed by polymerase chain reaction. P. gingivalis was detected in 1.5%, 10.0% and 29.6% of these subjects, respectively. Significant differences were observed with regard to P. gingivalis infection among the groups [chi-squared analysis: gingivitis vs. healthy, P < 0.01, odds ratio (OR) = 7.4; periodontitis vs. healthy, P < 0.001, OR = 27.8]. In P. gingivalis-positive subjects with periodontitis, the most prevalent fimA types were type Ib/type II combination (37.5%) and type IV (37.5%), followed by type II (25.0%), while type IV (33.3%) and type II (29.2%) were most often detected in those with gingivitis. Our results suggest that the presence of P. gingivalis is associated with periodontal diseases, and that the type II, IV and Ib/II combination are the most common among fimA genotypes.
authors.affiliation: Department of Pediatric Dentistry, Hiroshima University Graduate School of Biomedical Sciences, Japan.
authors.forename: Fumiko
authors.initials: F
authors.lastname: Hayashi
authors.forename: Mitsugi
authors.initials: M
authors.lastname: Okada
authors.forename: Yuki
authors.initials: Y
authors.lastname: Oda
authors.forename: Taro
authors.initials: T
authors.lastname: Kojima
authors.forename: Katsuyuki
authors.initials: K
authors.lastname: Kozai
mesh_terms: D000293:Adolescent; D016009:Chi-Square Distribution; D002648:Child; D002675:Child, Preschool; D004269:DNA, Bacterial / Q000235:genetics; D003773:Dental Plaque / Q000453:epidemiology / Q000382:microbiology*; D036781:Fimbriae Proteins / Q000145:classification / Q000235:genetics*; D005838:Genotype; D005891:Gingivitis / Q000453:epidemiology / Q000382:microbiology*; D006801:Humans; D007223:Infant; D007564:Japan / Q000453:epidemiology; D017720:Molecular Epidemiology; D016017:Odds Ratio; D010518:Periodontitis / Q000453:epidemiology / Q000382:microbiology*; D016966:Porphyromonas gingivalis / Q000235:genetics*
chemical_list: D004269:DNA, Bacterial; C063055:fimbrillin; D036781:Fimbriae Proteins