title: Detection of Porphyromonas gingivalis and Streptococcus intermedius in chronic periodontitis patients by multiplex PCR.
abstract: A Multiplex PCR assay for the detection of Porphyromonas gingivalis and Streptococcus intermedius in chronic periodontitis is presented. A total of 180 samples from 65 adults with untreated periodontitis and 17 healthy volunteers were taken and processed in a simple boiling step. Cell lysates were used as DNA source for multiplex PCR assays. Primers were designed from 16S rRNA gene sequences from the GenBank-EMBL database showing specificity for target pathogens. This multiplex PCR system could detect 8.2 P gingivalis and S. intermedius cells. In untreated periodontitis patients, only 78.5% were positive for one or both bacteria; 37% were positive for P gingivalis only, 17% for S. intermedius and 24.5% for both. P. gingivalis was detected in 23.5% of healthy volunteers, while S. intermedius was not detected in the same patients. The distribution of these bacteria was related to the periodontal probing depth, while 95.23% of patients with pockets wih 6 to 7 mm deep were positive for either or both, only 70.45% of of them with 4 to 5 mm pockets were positive.
authors.affiliation: Instituto de Biotecnología, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, México.
authors.forename: Myriam A
authors.initials: MA
authors.lastname: De La Garza-Ramos
authors.forename: Luis J
authors.initials: LJ
authors.lastname: Galán-Wong
authors.forename: Raúl G
authors.initials: RG
authors.lastname: Caffesse
authors.forename: Francisco
authors.initials: F
authors.lastname: González-Salazar
authors.forename: Benito
authors.initials: B
authors.lastname: Pereyra-Alférez
mesh_terms: D000328:Adult; D055113:Chronic Periodontitis / Q000382:microbiology*; D004269:DNA, Bacterial / Q000032:analysis; D006801:Humans; D010514:Periodontal Pocket / Q000382:microbiology; D010519:Periodontium / Q000382:microbiology; D016133:Polymerase Chain Reaction / Q000379:methods*; D016966:Porphyromonas gingivalis / Q000302:isolation & purification*; D012329:RNA, Bacterial / Q000032:analysis; D012336:RNA, Ribosomal, 16S / Q000032:analysis; D013045:Species Specificity; D034367:Streptococcus intermedius / Q000302:isolation & purification*
chemical_list: D004269:DNA, Bacterial; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S