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Hepatic gene expression profiling of GH transgenic coho salmon with and without ration restriction

ABSTRACT: This is the first use of cDNA microarrays to study the influence of GH transgenesis on liver gene expression in a non-mammalian vertebrate. Three groups of salmon were examined: transgenic on full ration (T), transgenic on restricted ration (R), and control nontransgenic (C). Daily weight gains in T were approximately 8-fold higher than in C, and 4-fold higher than in R. Differential gene expression in T, R, and C samples was determined using ~ 16,000 gene microarrays. In the GRASP microarray studies, only those features (cDNA spots on the microarrays) behaving similarly (e.g. greater than 2-fold up-regulated in T relative to C) in all slides of the study will be reported to minimize false positives occurring due to dye bias and technical variability. Coho salmon transcripts responding reproducibly to GH transgenesis with and without feed rationing will be reported. Many of the microarray-identified hepatic transcripts responsive to GH transgenesis with and without rationing are involved in iron homeostasis, metabolism, cellular proliferation, and innate immunity. Keywords: Impact of growth hormone transgenesis with and without ration restriction on global hepatic gene expression

ORGANISM(S): Salmo salar Oncorhynchus kisutch

PROVIDER: GSE3477 | GEO | 2005/12/31

SECONDARY ACCESSION(S): PRJNA93287

REPOSITORIES: GEO

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Project description:Most Pacific salmonids undergo smoltification and transition from freshwater to saltwater. Saltwater acclimation requires salmonids to make various adjustments in color, shape, size, metabolism, catabolism, and osmotic and ion regulation. The molecular mechanisms underlying this transition are largely unknown. The present study acclimated coho salmon (Oncorhynchus kisutch) to four different salinities (<0.5, 8, 16, and 32 ppth) and assessed gene expression through microarray analysis of gill, liver and olfactory tissues. Gills are involved in osmotic regulation, liver plays a role in energetics, and olfactory tissues are involved in behavior. Between all salinity treatments, liver had the highest number of differentially expressed genes at 1,616. Gills had 1,074 differentially expressed genes and olfactory tissue had 924. The difference in the number of differentially expressed genes may be due to the higher responsiveness of liver to metabolic changes after salinity acclimation to provide energy to fuel other metabolic and osmoregulatory tissues like gills. Differentially expressed genes were tissue and salinity treatment dependent. There were no genes differentially expressed in all salinity treatments and all three tissues. Five genes were targeted for microarray confirmation by qPCR and included CCAAT/enhancer binding protein ? (CEBPB), calpain 1 (CAPN1), proto-oncogene, serine/threonine kinase (Pim1), aldolase B, fructose-bisphosphate (aldob), and complement component 3 (c3). qPCR expression profiles of these genes matched array outputs. Gene ontology term analysis revealed biological processes, molecular functions, and cellular components that were significant. Most terms were tissue dependent. For liver, oxygen binding and transport terms were highlighted, suggesting possible impacts on metabolism. For gills, muscle and cytoskeleton related terms were emphasized and for olfactory tissues, immune response related genes were accentuated. Interaction networks were examined in combination with GO terms and determined similarities between tissues for potential osmosenors and signal transduction cascades. Overall this study suggests that Pacific salmonids share many salinity acclimation molecular mechanisms with other species, with a few new genes identified, and that although the three tissues shared certain underlying mechanism, many of the differentially expressed genes were tissue-specific. To assess how salinity acclimation in coho salmon (Oncorhynchus kisutch) impacted gene expression in gills, liver, and olfactory tissues.

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Hepatic gene expression profiling of GH transgenic coho salmon with and without ration restriction

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