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Bioactivity of the ubiquitous tire preservative 6PPD and degradant, 6PPD-quinone in fish and mammalian-based assays.
Toxicol Sci
January 2025
U.S. EPA, Office of Research and Development, Center for Computational Toxicology and Exposure, Great Lakes Toxicology Division, 6201 Congdon Blvd, Duluth, MN, 55804, USA.
6PPD-quinone (N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine quinone), a transformation product of the antiozonant 6PPD (N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine) is a likely causative agent of coho salmon (Oncorhynchus kisutch) pre-spawn mortality. Stormwater runoff transports 6PPD-quinone into freshwater streams, rapidly leading to neurobehavioral, respiratory distress, and rapid mortality in laboratory exposed coho salmon, but causing no mortality in many laboratory-tested species. Given this identified hazard, and potential for environmental exposure, we evaluated a set of U.
View Article and Find Full Text PDFPRV-1b and PRV-3a infection is associated with the same clinical disease in coho salmon (Oncorhynchus kisutch) farmed in Chile: unraveling the pathogenesis of the orthoreoviral cardiomyopathy and hemolytic jaundice (OCHJ).
Vet Res
January 2025
Pathovet Labs, Los Lagos, Puerto Montt, Chile.
Piscine orthoreovirus (PRV) is a virus that is widely distributed among global aquaculture populations of salmonid species. The coho salmon (Oncorhynchus kisutch) is a species of increasing productive and economic importance in Chile. The presence of PRV has generated concern about its impact on the health and welfare of this species.
View Article and Find Full Text PDFRobust discrimination between closely related species of salmon based on DNA fragments.
Anal Bioanal Chem
January 2025
Statistical Engineering Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD, 20899-8980, USA.
Closely related species of Salmonidae, including Pacific and Atlantic salmon, can be distinguished from one another based on nucleotide sequences from the cytochrome c oxidase sub-unit 1 mitochondrial gene (COI), using ensembles of fragments aligned to genetic barcodes that serve as digital proxies for the relevant species. This is accomplished by exploiting both the nucleotide sequences and their quality scores recorded in a FASTQ file obtained via Next Generation (NextGen) Sequencing of mitochondrial DNA extracted from Coho salmon caught with hook and line in the Gulf of Alaska. The alignment is done using MUSCLE (Muscle 5.
View Article and Find Full Text PDFWarming associated with climate change is driving poleward shifts in the marine habitat of anadromous Pacific salmon ( spp.). Yet the spawning locations for salmon to establish self-sustaining populations and the consequences for the ecosystem if they should do so are unclear.
View Article and Find Full Text PDFPRDM9 drives the location and rapid evolution of recombination hotspots in salmonid fish.
PLoS Biol
January 2025
Institut de Génétique Humaine, Univ Montpellier, Centre National de la Recherche Scientifique, Montpellier, France.
In many eukaryotes, meiotic recombination occurs preferentially at discrete sites, called recombination hotspots. In various lineages, recombination hotspots are located in regions with promoter-like features and are evolutionarily stable. Conversely, in some mammals, hotspots are driven by PRDM9 that targets recombination away from promoters.
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