Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Influence of developmental stage and genotype on liver mRNA levels among wild, domesticated, and hybrid rainbow trout (Oncorhynchus mykiss)

ABSTRACT: A 44K salmonid oligoarray was used to examine the influence of genotype and developmental stage on mRNA expression in wild-type (age matched and size matched to domesticated), domesticated and wild-domesticated hybrid populations. Significant differences were found in mRNA expression between genotypes. The largest proportion of differentially expressed mRNAs were found in comparisons of domesticated and wild-type groups. Significant differences were also noted in pairings of wild-domesticated hybrid progeny to both parental strains. Differences in gene expression were found in comparison of both wild-type age and size matched to each other and in combination with genotype analysis, showing a strong effect of fish developmental stage on differential gene expression. Domestication was found to modify biological pathways associated with transport, metabolism, cell tissue structure and development, stress and immune response and protein synthesis. Genotype analysis of hybrid progeny inheritance patterns showed similar levels of recessive, dominant and additive effects. Microarray analysis was performed on liver RNA from 6 individual fish per group of age-matched wild, size-matched wild, domesticated and wild-domesticated hybrids. Samples were hybridized against a common wild-type reference pool (n=6 wild size-matched fish). One individual from each of the groups was hybridized to one array on each of the individual slides (n=6) in the order of domestic, hybrid, age-matched wild and size-matched wild. In total, 6 4x44K oligoarray slides were used to complete the study.

ORGANISM(S): Oncorhynchus mykiss

SUBMITTER: Samantha White

PROVIDER: E-GEOD-45151 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Growth rate can be genetically modified in many vertebrates by domestication and selection, and more recently by transgenesis overexpressing growth factor genes (e.g. growth hormone, GH). While the phenotypic end consequence is similar, it is currently not clear whether the same modifications to physiological pathways are occurring in both genetic processes, nor to what extent they may interact when combined. To examine these questions, we have used rainbow trout as a model species because non-domesticated wild strains are available as comparators to assess genetic and physiological changes that have arisen from domestication and from GH transgenesis. In addition to pure wild and pure domesticated strains, two different GH transgenes with markedly different growth effects were examined, both in a wild background and in hybrids which combined domesticated and wild genomes in addition to the transgene. We find that liver mRNAs show highly concordant changes in levels in both types of fast-growing fish, relative to wild type, for both up- and down-regulated genes. Further, among domesticated, transgenic, and their hybrid genotypes, a strong positive correlation was found between growth rate and the number of genes affected or their levels of mRNA. Functional analysis found that genes involved in immune function, carbohydrate metabolism, detoxification, transcription regulation, growth regulation, and lipid metabolism were affected in common by domestication and GH transgenesis. The common responses of domesticated and GH transgenic strains is consistent with the GH pathway or its downstream effects being upregulated in domesticated animals during their modification from wild-type growth rates. Microarray analyses were performed on five individual rainbow trout per group of pure wild, pure domesticated, GH transgenic strain 1 in wild, GH transgenic strain 2 in wild, GH transgenic strain 1 in wild-domestic hybrid, and GH transgenic strain 2 in wild-domestic hybrid hybridized (one slide per individual) against a common wild-type RNA pool.

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Influence of developmental stage and genotype on liver mRNA levels among wild, domesticated, and hybrid rainbow trout (Oncorhynchus mykiss)

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