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Applied and Environmental Microbiology, January 2000, p. 435-438, Vol. 66, No. 1
0099-2240/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Molecular Diversity of Renibacterium salmoninarum Isolates Determined by Randomly Amplified Polymorphic DNA Analysis

T. Hilton Grayson,1,* Franck A. Atienzar,2 Sarah M. Alexander,1 Lynne F. Cooper,1 and Martyn L. Gilpin1

Department of Biological Sciences1 and Plymouth Environmental Research Centre,2 University of Plymouth, Plymouth PL4 8AA, Devon, United Kingdom

Received 30 August 1999/Accepted 22 October 1999

The molecular diversity among 60 isolates of Renibacterium salmoninarum which differ in place and date of isolation was investigated by using randomly amplified polymorphic DNA (RAPD) analysis. Isolates were grouped into 21 banding patterns which did not reflect the biological source. Four 16S-23S rRNA intergenic spacer (ITS1) sequence variations and two alleles of an exact tandem repeat locus, ETR-A, were the bases for formation of distinct groups within the RAPD clusters. This study provides evidence that the most common ITS1 sequence variant, SV1, possesses two copies of a 51-bp repeat unit at ETR-A and has been widely dispersed among countries which are associated with mainstream intensive salmonid culture.

* Corresponding author. Mailing address: Room 401A Davy Building, University of Plymouth, Plymouth PL4 8AA, United Kingdom. Phone: 44 1752 232950. Fax: 44 1752 232970. E-mail: tgrayson{at}plymouth.ac.uk.

Applied and Environmental Microbiology, January 2000, p. 435-438, Vol. 66, No. 1
0099-2240/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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