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PCR monitoring for tetracycline resistance genes in subgingival plaque following site‐specific periodontal therapy
Author(s) -
ManchCitron Jean N.,
Lopez Gilbert H.,
Dey Anjana,
Rapley John W.,
MacNeill Simon R.,
Cobb Charles M.
Publication year - 2000
Publication title -
journal of clinical periodontology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.456
H-Index - 151
eISSN - 1600-051X
pISSN - 0303-6979
DOI - 10.1034/j.1600-051x.2000.027006437.x
Subject(s) - tetracycline , biology , microbiology and biotechnology , periodontitis , gene , dental plaque , plasmid , polymerase chain reaction , antibiotics , dentistry , genetics , medicine
Background: The selection of antibiotic resistance genes during antibiotic therapy is a critical problem complicated by the transmission of resistance genes to previously sensitive strains via conjugative plasmids and transposons and by the transfer of resistance genes between gram‐positive and gram‐negative bacteria. The purpose of this investigation was to monitor the presence of selected tetracycline resistance genes in subgingival plaque during site specific tetracycline fiber therapy in 10 patients with adult periodontitis. Method: The polymerase chain reaction (PCR) was used in separate tests for the presence of 3 tetracycline resistance genes ( tetM, tetO and tetQ) in DNA purified from subgingival plaque samples. Samples were collected at baseline, i.e., immediately prior to treatment, and at 2 weeks, and 1, 3, and 6 months post‐fiber placement. The baseline and 6‐month samples were also subjected to DNA hybridization tests for the presence of 8 putative periodontal pathogenic bacteria. Results: PCR analysis for the tetM resistance gene showed little or no change in 5 patients and a decrease in detectability in the remaining 5 patients over the 6 months following tetracycline fiber placement. The results for tetO and tetQ were variable showing either no change in detectability from baseline through the 6‐month sampling interval or a slight increase in detectability over time in 4 of the 10 patients. DNA hybridization analysis showed reductions to unmeasurable levels of the putative periodontal pathogenic bacteria in all but 2 of the 10 patients. Conclusions: These results complement earlier studies of tet resistance and demonstrate the efficacy of PCR monitoring for the appearance of specific resistance genes during and after antibiotic therapy.