Browsing by Author "Montes de Oca, Marco"

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    Genomics of Re-Emergent Aeromonas salmonicida in Atlantic Salmon Outbreaks
    (2024) Godoy, Marcos; Montes de Oca, Marco; Suarez, Rudy; Martinez, Alexis; Pontigo, Juan Pablo; Caro, Diego; Kusch, Karina; Coca, Yoandy; Bohle, Harry; Bayliss, Sion; Kibenge, Molly; Kibenge, Frederick
    Furunculosis, caused by Aeromonas salmonicida, poses a significant threat to both salmonid and non-salmonid fish in diverse aquatic environments. This study explores the genomic intricacies of re-emergent A. salmonicida outbreaks in Atlantic salmon (Salmo salar). Previous clinical cases have exhibited pathological characteristics, such as periorbital hemorrhages and gastrointestinal abnormalities. Genomic sequencing of three Chilean isolates (ASA04, ASA05, and CIBA_5017) and 25 previously described genomes determined the pan-genome, phylogenomics, insertion sequences, and restriction-modification systems. Unique gene families have contributed to an improved understanding of the psychrophilic and mesophilic clades, while phylogenomic analysis has been used to identify mesophilic and psychrophilic strains, thereby further differentiating between typical and atypical psychrophilic isolates. Diverse insertion sequences and restriction-modification patterns have highlighted genomic structural differences, and virulence factor predictions can emphasize exotoxin disparities, especially between psychrophilic and mesophilic strains. Thus, a novel plasmid was characterized which emphasized the role of plasmids in virulence and antibiotic resistance. The analysis of antibiotic resistance factors revealed resistance against various drug classes in Chilean strains. Overall, this study elucidates the genomic dynamics of re-emergent A. salmonicida and provides novel insights into their virulence, antibiotic resistance, and population structure.
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    Salmo salar Skin and Gill Microbiome during Piscirickettsia salmonis Infection
    (2024) Godoy, Marcos; Coca, Yoandy; Suarez, Rudy; Montes de Oca, Marco; Bledsoe, Jacob W.; Burbulis, Ian; Caro, Diego; Pontigo, Juan Pablo; Maracaja-Coutinho, Vinicius; Arias-Carrasco, Raul; Rodriguez-Cordova, Leonardo; Saez-Navarrete, Cesar
    Maintaining the high overall health of farmed animals is a central tenant of their well-being and care. Intense animal crowding in aquaculture promotes animal morbidity especially in the absence of straightforward methods for monitoring their health. Here, we used bacterial 16S ribosomal RNA gene sequencing to measure bacterial population dynamics during P. salmonis infection. We observed a complex bacterial community consisting of a previously undescribed core pathobiome. Notably, we detected Aliivibrio wodanis and Tenacibaculum dicentrarchi on the skin ulcers of salmon infected with P. salmonis, while Vibrio spp. were enriched on infected gills. The prevalence of these co-occurring networks indicated that coinfection with other pathogens may enhance P. salmonis pathogenicity.