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Transcriptomic characterisation of a common skin lesion in farmed Chinook salmon
journal contributionposted on 2023-05-21, 06:49 authored by Kelli AndersonKelli Anderson, Bikramjit GhoshBikramjit Ghosh, Thaveshini Chetty, Walker, SP, Symonds, JE, Barbara NowakBarbara Nowak
Little is known about host responses of farmed Chinook salmon with skin lesions, despite the lesions being associated with increased water temperatures and elevated mortality rates. To address this shortfall, a transcriptomic approach was used to characterise the molecular landscape of spot lesions, the most commonly reported lesion type in New Zealand Chinook salmon, versus healthy appearing skin in fish with and without spot lesions. Many biological (gene ontology) pathways were enriched in lesion adjacent tissue, relative to control skin tissue, including proteolysis, fin regeneration, calcium ion binding, mitochondrial transport, actin cytoskeleton organisation, epithelium development, and tissue development. In terms of specific transcripts of interest, pro-inflammatory cytokines (interleukin 1β and tumour necrosis factor), annexin A1, mucin 2, and calreticulin were upregulated, while cathepsin H, mucin 5AC, and perforin 1 were downregulated in lesion tissue. In some instances, changes in gene expression were consistent between lesion and healthy appearing skin from the same fish relative to lesion free fish, suggesting that host responses weren't limited to the site of the lesion. Goblet cell density in skin histological sections was not different between skin sample types. Collectively, these results provide insights into the physiological changes associated with the common spot lesions in farmed Chinook salmon.
Publication titleFish and Shellfish Immunology
Department/SchoolInstitute for Marine and Antarctic Studies
PublisherAcademic Press Ltd Elsevier Science Ltd
Place of publication24-28 Oval Rd, London, England, Nw1 7Dx
Rights statementCopyright 2022 Elsevier Ltd.