The purpose of this proposal is to generate data on the prevalence of antibiotic resistance genes in the bacterial flora from periodontally diseased individuals and determine if DNA probes for specific antibiotic resistance genes can be used to test plaque samples taken directly from diseased sites.
The specific aims are the following: l. Characterize the antibiotic resistance determinants carried by the subgingival microflora isolated from 2- 3 early onset periodontitis patients with a history of antibiotic therapy. The target organisms will include: Actinobacillus actinomycetemcomitans, Bacteroides forsythus, Campylobacter (Wolinella) recta, Prevotella intermedia, Porphyromonas gingivalis, Treponema denticola, as well as, the normal flora species which grow on antibiotic supplemented plates. 2. Determine the efficacy of screening subgingival plaque samples for the presence of antibiotic resistance genes using DNA probes. The material will be screened with DNA probes coding for tetracycline, macrolides plus clindamycin and metronidazole antibiotic resistance genes. Both normal subjects and patients with periodontitis will be sampled. Cultures, from probe positive sites, will be taken to allow isolation and identification of periopathogens. We will determine if there is a correlation between the direct plaque hybridization and hybridization of the isolated bacteria with the various DNA probes. The antibiotic resistant, normal flora will also be examined. Information on the status of antibiotic resistant organisms from plaque samples could be used in planning and prescribing the patient's, antibiotic treatment. 3. Screen the available periodontal pathogens with the DNA probes for tetracycline, macrolides, lincosamides, clindamycin, and metronidazole resistance genes. 4. Correlate hybridization with a specific antibiotic resistance DNA probe and the organisms ability to grow in the presence of that antibiotic. Determine if the antibiotic resistance genes can be transferred to the recipients during conjugation. The information we generate from this grant will provide needed molecular tools, such as potential transposons for transposon mutagenesis, to further study the pathogenic properties of a variety of periodontal pathogens.

Agency
National Institute of Health (NIH)
Institute
National Institute of Dental & Craniofacial Research (NIDCR)
Type
Small Research Grants (R03)
Project #
1R03DE010913-01
Application #
2131883
Study Section
NIDCR Special Grants Review Committee (DSR)
Project Start
1994-04-01
Project End
1996-03-31
Budget Start
1994-04-01
Budget End
1995-03-31
Support Year
1
Fiscal Year
1994
Total Cost
Indirect Cost
Name
University of Washington
Department
Pathology
Type
Schools of Public Health
DUNS #
135646524
City
Seattle
State
WA
Country
United States
Zip Code
98195
Chung, Whasun O; Gabany, Joseph; Persson, G Rutger et al. (2002) Distribution of erm(F) and tet(Q) genes in 4 oral bacterial species and genotypic variation between resistant and susceptible isolates. J Clin Periodontol 29:152-8
Chung, W O; Werckenthin, C; Schwarz, S et al. (1999) Host range of the ermF rRNA methylase gene in bacteria of human and animal origin. J Antimicrob Chemother 43:5-14
Roberts, M C; Chung, W O; Roe, D et al. (1999) Erythromycin-resistant Neisseria gonorrhoeae and oral commensal Neisseria spp. carry known rRNA methylase genes. Antimicrob Agents Chemother 43:1367-72
Chung, W O; Young, K; Leng, Z et al. (1999) Mobile elements carrying ermF and tetQ genes in gram-positive and gram-negative bacteria. J Antimicrob Chemother 44:329-35
Roberts, M C (1998) Antibiotic resistance mechanisms in bacteria of oral and upper respiratory origin. Int J Antimicrob Agents 9:255-67
Seppala, H; Skurnik, M; Soini, H et al. (1998) A novel erythromycin resistance methylase gene (ermTR) in Streptococcus pyogenes. Antimicrob Agents Chemother 42:257-62
Roberts, M C (1998) Antibiotic resistance in oral/respiratory bacteria. Crit Rev Oral Biol Med 9:522-40
Schwarz, S; Roberts, M C; Werckenthin, C et al. (1998) Tetracycline resistance in Staphylococcus spp. from domestic animals. Vet Microbiol 63:217-27
Roberts, M C (1997) Genetic mobility and distribution of tetracycline resistance determinants. Ciba Found Symp 207:206-18; discussion 219-22
Leng, Z; Riley, D E; Berger, R E et al. (1997) Distribution and mobility of the tetracycline resistance determinant tetQ. J Antimicrob Chemother 40:551-9

Showing the most recent 10 out of 17 publications