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

• Published in: Microbiology (Society for General Microbiology) Vol. 144; no. 8; pp. 2141 - 2149
• Main Authors: Umelo, Elizabeth, Trust, Trevor J
• Format: Journal Article
• Language: English
• Published: Reading Soc General Microbiol 01-08-1998; Society for General Microbiology
• Subjects: Aeromonas - genetics; Aeromonas - pathogenicity; Aeromonas salmonicida; Bacteriology; Biological and medical sciences; Chromosomes, Bacterial - genetics; Deoxyribonucleases, Type II Site-Specific - genetics; DNA, Bacterial - chemistry; Endodeoxyribonucleases - genetics; Fundamental and applied biological sciences. Psychology; Genetics; Microbiology; Restriction Mapping - methods; Virulence; Genetic mapping; Vertebrata; Genome organization; Pisces; Bacteria; Vibrionaceae; Aeromonas salmonicida; Chromosome DNA; Intraspecific comparison; Veterinary; Physical map; Structural analysis
• ISSN: 1350-0872; 1465-2080
• DOI: 10.1099/00221287-144-8-2141

Department of Biochemistry and Microbiology and Canadian Bacterial Diseases Network, University of Victoria, Victoria, BC, V8W 3P6 Canada
ABSTRACT
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 .
* Author for correspondence: Elizabeth Umelo. Tel: [phone]. Fax: [phone]. e-mail: [e-mail]
Keywords: Aeromonas salmonicida, physical map, genetic map, circular chromosome, genome comparison
Present address: Astra Research Center Boston Inc., 128 Sidney St, Cambridge, MA 01770, USA.
Present address: Department of Microbiology and Immunology, 300-6174 University Boulevard, University of British Columbia, Vancouver, BC, V6T 1Z3 Canada.