Journal
MICROORGANISMS
Volume 9, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/microorganisms9010085
Keywords
type three secretion system; pAsa5; Aeromonas salmonicida subsp; salmonicida; rearrangement; AsaGEI; prophage
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada [RGPIN-2019-04444]
- Ministere de l'agriculture, des pecheries et de l'alimentation du Quebec (INNOVAMER Program)
- Ressources Aquatiques Quebec grant
- NSERC
Ask authors/readers for more resources
European strains of Aeromonas salmonicida subsp. salmonicida are more prone to losing the TTSS locus compared to Canadian strains. A cluster of genes encoding putative proteins with DNA binding capacity and phage proteins was found to be almost perfectly correlated with the susceptibility of different strains to lose the locus. This discovery opens up new opportunities for studying the thermosensitivity of pAsa5.
The type three secretion system (TTSS) locus of Aeromonas salmonicida subsp. salmonicida, located on the plasmid pAsa5, is known to be lost when the bacterium is grown at temperatures of 25 degrees C. The loss of the locus is due to the recombination of the insertion sequences flanking the TTSS region. However, the mechanism involved in this recombination is still elusive. Here, we analyzed 22 A. salmonicida subsp. salmonicida strains that had already lost their TTSS locus, and we systematically explored another 47 strains for their susceptibility to lose the same locus when grown at 25 degrees C. It appeared that strains from Europe were more prone to lose their TTSS locus compared to Canadian strains. More specifically, it was not possible to induce TTSS loss in Canadian strains that have AsaGEI2a, a genomic island, and prophage 3, or in Canadian strains without a genomic island. A comparative genomic approach revealed an almost perfect correlation between the presence of a cluster of genes, not yet characterized, and the susceptibility of various groups of strains to lose their locus. This cluster of genes encodes putative proteins with DNA binding capacity and phage proteins. This discovery creates new opportunities in the study of pAsa5 thermosensitivity.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available