Alternatively spliced variants in Atlantic cod (Gadus morhua) support response to variable salinity environment

Area of Science:

• Marine Biology
• Genomics
• Molecular Biology

Background:

• Baltic Sea Atlantic cod face altered salinity.
• Gene expression and adaptation mechanisms are crucial for survival.

Purpose of the Study:

• Investigate the role of alternative splicing (AS) in Atlantic cod adaptation to salinity changes.
• Identify novel AS variants and their involvement in stress response pathways.

Main Methods:

• Transcriptome analysis of Atlantic cod gills.
• Comparison of AS profiles between different salinity exposure groups.

Main Results:

• Identified numerous AS variants, with 89% being novel compared to Atlantic populations.
• Observed gene-specific AS variants appearing only under altered salinity conditions (e.g., PLA2G4C).
• AS variants are implicated in regulating apoptosis, innate immunity, and pro-inflammatory responses.

Conclusions:

• Alternative splicing plays a significant role in the adaptive response of Atlantic cod to environmental changes.
• Novel AS variants contribute to genome complexity and facilitate rapid adaptation.
• AS provides a mechanism for fine-tuning gene expression in response to environmental stress.