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Journal of Clinical Microbiology, May 2004, p. 2036-2042, Vol. 42, No. 5
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.5.2036-2042.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Clonal Diversity and Stability of Subgingival Eikenella corrodens

O. Fujise, W. Chen, S. Rich, and C. Chen^*

Division of Primary Oral Health Care, University of Southern California School of Dentistry, Los Angeles, California 90089

Received 16 October 2003/ Returned for modification 15 December 2003/ Accepted 21 January 2004

Eikenella corrodens is a commensal subgingival bacterium commonly found in both periodontally nondiseased and diseased subjects. The present study examined the clonal diversity and stability of subgingival E. corrodens over time. Ninety-five subjects were enrolled at the baseline examination, including 44 periodontally nondiseased subjects and 51 subjects with aggressive periodontitis. Twenty-two nondiseased subjects and 11 subjects with aggressive periodontitis were subsequently reexamined after an average interval of 14 months. Two subgingival plaque samples were obtained from each subject to determine the total cultivable bacteria. In addition, multiple E. corrodens isolates from each sample were recovered for clonal analysis by arbitrarily primed PCR. The mean numbers of distinct E. corrodens clones harbored by nondiseased subjects and subjects with aggressive periodontitis were 1.3 and 3.0, respectively. Thirty-nine percent of the nondiseased subjects and 63% of the subjects with aggressive periodontitis harbored multiple clones of E. corrodens. The numbers of distinct E. corrodens clones increased significantly (Mann-Whitney ranking test, P < 0.05) in sites from patients with aggressive periodontitis, in sites with pocket depths of 4 mm or greater, in sites with a clinical attachment loss of 2 mm or greater, and in sites coinfected with Porphyromonas gingivalis. Comparison of E. corrodens clones recovered at the baseline and those recovered at the follow-up examination showed that E. corrodens colonization was not stable. Thirty-eight of the 66 follow-up samples (58%) showed a complete change (including de novo colonization of the sites or complete elimination of the organism from the sites) of the subgingival E. corrodens clonal types between the baseline and the follow-up examinations. Our results suggest a complexity of subgingival microbiota not seen previously.

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* Corresponding author. Mailing address: University of Southern California School of Dentistry, Division of Primary Oral Health Care, 925 W. 34th St., Los Angeles, CA 90089. Phone: (213) 740-1075. Fax: (213) 740-6778. E-mail: ccchen{at}usc.edu.

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Journal of Clinical Microbiology, May 2004, p. 2036-2042, Vol. 42, No. 5
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.5.2036-2042.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

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