1887

Abstract

subsp. is the causative agent of fish pasteurellosis, a severe disease affecting cultured marine fish worldwide. In this study, suppression subtractive hybridization was used to identify DNA fragments present in the virulent strain PC554.2, but absent in the avirulent strain EPOY 8803-II. Twenty-one genomic regions of this type (that included twenty-six distinct putative ORFs) were analysed by DNA sequencing. Twenty ORFs encoded proteins with homology to proteins in other bacteria, including four homologues involved in siderophore biosynthesis, and four homologues related to mobile elements; three of these were putative transposases and one was a putative conjugative transposon related to the SXT element. This sequence was shown to be integrated into a gene homologue. Six ORFs showed no significant homology to known bacterial proteins. Among the 21 DNA fragments specific to strain PC554.2, 5 DNA fragments (representing 7 ORFs) were also absent in the avirulent strain ATCC 29690. The analysis of these differential regions, as well as the screening of their presence in a collection of strains, demonstrated the high genetic heterogeneity of this pathogen.

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2005-08-01
2021-01-19
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