Intestinal Transcriptome Analysis Reveals Soy Derivative-Linked Changes in Atlantic Salmon.

Area of Science:

• Aquaculture
• Fish immunology
• Gastroenterology

Background:

• Intestinal inflammation is a significant non-infectious disease in farmed carnivorous fish.
• Plant-derived feed ingredients, particularly soybean derivatives, can cause intestinal inflammation due to antinutritional factors.

Purpose of the Study:

• To investigate the inflammatory responses in the distal intestine of Atlantic salmon fed a diet rich in soybean derivatives.
• To analyze the molecular and cellular changes associated with soybean-induced enteritis.

Main Methods:

• Histology to assess intestinal morphology.
• Transcriptomics to identify differentially expressed genes and enriched pathways.
• Flow cytometry to analyze immune cell populations in whole blood.

Main Results:

• Soybean-fed fish exhibited altered intestinal morphology and upregulated inflammation-associated genes.
• Enriched pathways included taurine and hypotaurine metabolism, drug metabolism-cytochrome P450, and steroid biosynthesis.
• Increased lymphocyte-like cell populations were observed in the blood of fish fed soy products, while head kidney gene expression remained unchanged.

Conclusions:

• Soybean derivatives induce significant changes in intestinal transport mechanisms and metabolic pathways in Atlantic salmon.
• Soybean-induced enteritis serves as a valuable model for studying fish inflammatory responses at cellular and molecular levels.
• Understanding these responses is crucial for developing healthier feed formulations in aquaculture.