Developmental expression patterns of six6: A gene linked with spawning ecotypes in Atlantic salmon

Area of Science:

• Developmental Biology
• Genetics
• Evolutionary Biology

Background:

• Atlantic salmon (Salmo salar) are key models for studying life history trait evolution.
• Gene expression patterns in salmon embryos are understudied.
• The six6 gene is implicated in spawning ecotypes and sexual maturity.

Purpose of the Study:

• To investigate the embryonic developmental expression of the six6 gene in Atlantic salmon.
• To identify novel roles for six6 beyond known functions in vertebrates.

Main Methods:

• Whole-mount in situ hybridization was used to assay six6 gene expression.
• Analysis focused on embryonic development stages in Atlantic salmon.

Main Results:

• Conserved expression of six6 was observed in developing brain and sensory organs (optic, olfactory primordia).
• Novel expression domains were identified in axial, appendicular, cardiovascular, and intestinal development.
• These findings suggest potential pleiotropic roles for six6.

Conclusions:

• The six6 gene plays conserved roles in Atlantic salmon sensory organ development.
• Additional roles in organogenesis suggest six6 influences multiple developmental pathways.
• Six6 may have pleiotropic functions contributing to the complex sensory ecology of Atlantic salmon.