ArticleFEMS microbiology letters2024
Characterization of Aeromonas salmonicida mesophilic isolates from Alberta (Canada) allows the development of a more sensitive Dictyostelium discoideum predation test.
Article in FEMS microbiology letters, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Aeromonas salmonicida is studied using Dictyostelium discoideum as a model host, with predation resistance measured as a key parameter. Aeromonas salmonicida mesophilic isolates exhibit inconclusive results with the amoebic model. This study focuses on new mesophilic isolates (S24-S38, S26-S10, and S28-S20) from Alberta, Canada, and introduces an improved predation test method. Phylogenetic analysis reveals two subgroups, with S24-S38 and S26-S10 clustering with the subspecies pectinolytica from Argentina, and S28-S20 with strains from India (Y567) and Spain (AJ83), showcasing surprising mesophilic strain diversity across geographic locations. Predation tests were carried out with various mesophilic and psychrophilic strains of A. salmonicida, including Alberta isolates. The amoeba cell lines used were DH1-10 and AX2. Although the mesophilic isolates were very resistant to predation by the amoeba DH1-10, some lost this resistance to the AX2 strain, which appeared more voracious in the conditions tested. In addition, when diluting the culture medium used in a predation test with AX2, a loss of the capacity to predation resistance was observed for all the mesophilic isolates, including the highly resistant S28-S20 isolate. This study provides insights into the predation resistance of A. salmonicida isolates and offers avenues for better characterizing mesophilic isolates.
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