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Global Gene Expression Analysis Using a Zebrafish Oligonucleotide Microarray Platform
Published on: August 10, 2009
Gene expression profiling in Atlantic cod (Gadus morhua L.) from two contaminated sites using a custom-made cDNA
Kai K Lie1, Anders Lanzen, Harald Breilid
1National Institute of Nutrition and Seafood Research, Nordnesboder 2, N-5005 Bergen, Norway. kai.lie@nifes.no
Environmental Toxicology and Chemistry
|April 15, 2009
Summary
Gene expression in Atlantic cod revealed subtle differences between polluted and unpolluted sites, with specific biotransformation and metal-stress genes affected differently in males and females. Farmed cod showed less gene expression variation than wild cod.
Area of Science:
- Environmental toxicology
- Molecular biology
- Aquaculture science
Background:
- Atlantic cod (Gadus morhua) populations in Norway are exposed to varying environmental contaminants.
- Understanding gene expression changes is crucial for assessing the impact of pollution on marine fish health.
- Differences in gene expression between wild and farmed cod populations are not well-characterized.
Purpose of the Study:
- To investigate the effects of environmental contaminants on gene expression in Atlantic cod populations.
- To compare gene expression profiles between wild cod from polluted and unpolluted sites, and farmed cod.
- To identify specific genes and pathways affected by contaminants in different cod populations.
Main Methods:
- Construction and application of a custom cDNA microarray (CodStress array) with 746 clones.
- Analysis of liver gene expression in Atlantic cod from two polluted sites (Store Lungegårdsvann, Sørfjorden), one reference site (Øystese/Jondal), and farmed cod.
- Statistical analysis including Pearson correlation to compare gene expression patterns.
Main Results:
- Few significant transcriptional differences were observed between cod from polluted and unpolluted natural sites.
- Upregulation of Cytochrome P4501A (CYP1A) and sulfotransferase 1 (SULT1) in males from Store Lungegårdsvann.
- Upregulation of metal-stress related genes (heme oxygenase, ferritin, metallothionein) in females from Sørfjorden.
- Farmed cod exhibited reduced gene expression variability compared to wild cod, forming distinct clusters.
Conclusions:
- Environmental contaminant composition influences specific gene expression patterns in Atlantic cod.
- Sex-specific responses to contaminants were observed, particularly for biotransformation and metal-stress genes.
- Farmed cod demonstrate a more uniform gene expression profile, likely due to controlled environmental conditions.
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