title: Detection and prevalence of the tetracycline resistance determinant Tet Q in the microbiota associated with adult periodontitis.
abstract: Subgingival plaque samples were collected from 68 patients with a history of moderate to severe adult periodontitis and enumerated on Trypticase-soy blood agar plates, with and without tetracycline at 4 micrograms/ml. Each different colony morphotype was enumerated, and a representative colony was subcultured for identification and examined for the tetracycline resistance gene tet(Q) by polymerase chain reaction (PCR) amplification and DNA hybridization, using a fragment of tetA(Q)2 from Bacteroides fragilis 1126. PCR primers (5'-GGCTTCTACGACATCTATTA-3' and 5'-CATCAACATTTATCTCTCTG-3') were chosen to amplify a 755 bp region of tet(Q). The subgingival plaque samples were also tested by PCR. Approximately 12% of the total cultivable flora was resistant to tetracycline, and the percentage of the tetracycline-resistant cultivable flora with the tet(Q) gene varied greatly from one patient to another with a range from 0.0 to 67%. Half of the 68 subgingival plaque samples were positive or weakly positive for tet(Q) by PCR. Approximately 15% of the 210 isolates subcultured with resistance to tetracycline, (> or = 4 micrograms/ml) contained tet(Q), and 60% contained tet(M). All of the tet(Q)-resistant isolates were gram-negative anaerobic bacilli and included all of the Prevotella and Bacteroides isolates.
authors.affiliation: Periodontal Disease Research Center, College of Dentistry, University of Florida, Gainesville, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Lacroix
authors.forename: C B
authors.initials: CB
authors.lastname: Walker
mesh_terms: D000328:Adult; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001421:Bacteria, Anaerobic / Q000187:drug effects / Q000235:genetics*; D001426:Bacterial Proteins / Q000235:genetics; D001439:Bacteroides / Q000187:drug effects / Q000235:genetics; D001483:Base Sequence; D017931:DNA Primers; D015342:DNA Probes; D004269:DNA, Bacterial / Q000235:genetics; D003773:Dental Plaque / Q000382:microbiology; D004318:Doxycycline / Q000494:pharmacology; D005798:Genes, Bacterial; D006090:Gram-Negative Bacteria / Q000187:drug effects / Q000235:genetics; D006094:Gram-Positive Bacteria / Q000187:drug effects / Q000235:genetics; D006801:Humans; D008826:Microbial Sensitivity Tests; D008911:Minocycline / Q000494:pharmacology; D008969:Molecular Sequence Data; D010518:Periodontitis / Q000382:microbiology*; D016133:Polymerase Chain Reaction; D018720:Prevotella / Q000187:drug effects / Q000235:genetics; D012680:Sensitivity and Specificity; D013752:Tetracycline / Q000494:pharmacology; D013753:Tetracycline Resistance / Q000235:genetics*
chemical_list: D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D017931:DNA Primers; D015342:DNA Probes; D004269:DNA, Bacterial; D013752:Tetracycline; D008911:Minocycline; D004318:Doxycycline