The inner ear proteome of fish

Area of Science:

• Biomineralization
• Otolithic proteomics
• Fish inner ear biology

Background:

• The molecular mechanisms governing fish otolith formation, growth, and composition remain largely uncharacterized.
• Previous research had identified only a limited number of proteins within otoliths.

Purpose of the Study:

• To identify novel proteins in fish otoliths and elucidate their roles in otolith formation and function.
• To develop hypotheses explaining inorganic material supply, daily growth band deposition, and crystal nucleation.

Main Methods:

• Utilized a partial transcriptome of the black bream (Acanthopagrus butcheri) inner ear.
• Integrated transcriptomic data with proteomic analyses to identify otolith proteins.

Main Results:

• Discovered hundreds of previously unidentified proteins in black bream otoliths.
• Formulated hypotheses for inorganic ion transport and daily growth band formation.
• Identified a potential protein involved in crystal nucleation and explained otolith metabolic inertness.

Conclusions:

• Provides an unprecedented molecular understanding of otolith biomineralization.
• Enhances the interpretation of otoliths as natural archives for age estimation, fisheries management, and climate change impact studies.