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Journal of Clinical Microbiology, June 2000, p. 2141-2149, Vol. 38, No. 6
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Macrorestriction Fingerprinting of "Streptococcus milleri" Group Bacteria by Pulsed-Field Gel Electrophoresis

K. L. Bartie, M. J. Wilson,* D. W. Williams, and M. A. O. Lewis

Department of Oral Surgery, Medicine and Pathology, University of Wales College of Medicine, Cardiff CF14 4XY, United Kingdom

Received 26 October 1999/Returned for modification 10 December 1999/Accepted 15 January 2000

Although isolates of the "Streptococcus milleri" group (SMG) of bacteria are regarded as members of the commensal microflora of the body, they are frequently encountered in purulent infections from a range of body sites. The genetic diversity of 91 epidemiologically unrelated SMG isolates (including 37 commensal strains and 49 disease-associated strains) was analyzed by macrorestriction fingerprinting (MF). The genomes were digested with SmaI and ApaI independently, and fragments were resolved by pulsed-field gel electrophoresis. Similarities between banding profiles were determined, and strains were clustered on this basis into dendrograms. In common with other commensal species that have been examined by MF, considerable genetic diversity was revealed. In addition, the clustering of strains tended to support the current taxonomic position of this heterogeneous group. The present study has shown that MF is a powerful tool for characterization of SMG strains and that its use is likely to be of great value in epidemiological and population genetic studies of this group of bacteria.

* Corresponding author. Mailing address: Department of Oral Surgery, Medicine and Pathology, University of Wales College of Medicine, Dental School, Heath Park, Cardiff CF14 4XY, United Kingdom. Phone and Fax: 029 20742442. E-mail: wilsonmj{at}cardiff.ac.uk.

Journal of Clinical Microbiology, June 2000, p. 2141-2149, Vol. 38, No. 6
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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