title: [Distribution of rag genotypes of Porphyromonas gingivalis in patients with chronic periodontitis].
abstract: OBJECTIVE
  To investigate the distribution of rag genotypes of Porphyromonas gingivalis (P. gingivalis) in chronic periodontitis patients.
  
  
  METHODS
  Subgingival plaque samples were collected from 50 chronic periodontitis patients. The occurrence of P. gingivalis was determined by polymerase chain reaction (PCR) using 16S rDNA-specific primers. Distribution of rag genotypes was assessed in P. gingivalis positive samples by PCR.
  
  
  RESULTS
  The occurrence of P. gingivalis was 70.7%, and the distribution of four rag genotypes among P. gingivalis positive samples was as follows: rag-1 60.4%; rag-2 23.6%; rag-3 44.3%; rag-4 15.1%, respectively.
  
  
  CONCLUSIONS
  P.gingivalis with various rag genotypes was present in subgingival plaque samples from chronic periodontitis patients, and P. gingivalis with rag-1 and rag-3 were more predominant in chronic periodontitis patients, which may be associated with the development of periodontitis.
authors.affiliation: Dept. of Periodontics, School of Stomatology, China Medical University, Shenyang 110002, China.
authors.forename: Guan-Hua
authors.initials: GH
authors.lastname: Wang
authors.forename: Dong-Mei
authors.initials: DM
authors.lastname: Zhang
authors.forename: Ya-Ping
authors.initials: YP
authors.lastname: Pan
mesh_terms: D000328:Adult; D055113:Chronic Periodontitis; D004268:DNA-Binding Proteins; D003773:Dental Plaque; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D010518:Periodontitis; D016133:Polymerase Chain Reaction; D016966:Porphyromonas gingivalis
chemical_list: D004268:DNA-Binding Proteins; C064655:V(D)J recombination activating protein 2