Submitted to: World Aquaculture Society Meeting
Publication Type: Abstract Only
Publication Acceptance Date: February 13, 2006
Publication Date: February 13, 2006
Citation: Darwish, A.M., Ismaiel, A.A. 2006. Title of Manuscript: Examining the universal genetic diversity of Flavobacterium columnare [abstract]. World Aquaculture Society Meeting. p.75. Technical Abstract: Genetic variability among strains of Flavobacterium columnare, isolated in the United States, was characterized by restriction fragment length polymorphism (RFLP) and phylogenetic analysis based on the sequence of the 16S rRNA gene. Twenty-seven isolates of F. columnare were differentiated into three genotypes. The isolates within the genotypes were further grouped based on RFLP of the 16S-23S rDNA spacer. The first genotype had five strains that were further divided into group A (4 strains) and B (1 strain) while the second genotype had 10 strains that were also further divided into group A (4 strains) and B (6 stains). The third genotype had 12 isolates with no differences in the RFLP patterns of the 16S-23S rDNA spacers. The 16S rRNA gene sequences representing the three identified genotypes were compared to the different published sequences by phylogenetic analysis and the results showed the American genotypes 1, 2 and 3 corresponding to genomovar 1, 2, and 3, respectively, reported by Triyanto and Wakabayashi. The study demonstrates a method for RFLP and sequencing of the 16S rRNA gene and the 16-23S rDNA spacer as a useful tool in epidemiological studies of F. columnare.