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Microbiology 144 (1998), 2141-2149
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microbiology, Vol 144, 2141-2149, Copyright © 1998 by Society for General Microbiology

ARTICLES

Physical map of the chromosome of Aeromonas salmonicida and genomic comparisons between Aeromonas strains

E Umelo and TJ Trust
Department of Biochemistry and Microbiology, University of Victoria, Canada. umelo@interchange.ubc.ca

I-Ceul and Pmel physical maps of the Aeromonas salmonicida A449 chromosome were constructed using PFGE. The circular chromosome of A. salmonicida A449 was estimated to be 4658 +/- 30 kb. The approximate location of several genes, including those encoding proteins implicated in virulence, were identified. The map showed that the known virulence- factor-encoding genes were not clustered. The I-Ceul genomic digestion fingerprints of several typical and atypical strains of A. salmonicida were compared. The results confirmed the homogeneity of typical strains, which provided further support for the clonality of the population structure of this group. Extensive diversity was observed in the I-Ceul digestion fingerprint of atypical strains, although a clonality was observed in the strains isolated from diseased goldfish. The results suggest that comparison of I-Ceul digestion fingerprints could be used as a powerful taxonomic tool to subdivide the atypical strains and also help clarify some of the current confusion associated with the taxonomy of the genus Aeromonas.


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