Tissue-Specific Venom Composition and Differential Gene Expression in Sea Anemones

Area of Science:

• Marine Biology
• Toxicology
• Genomics

Background:

• Cnidarians, including sea anemones, are venomous but lack a centralized venom delivery system.
• They utilize stinging capsules called nematocysts, with varying abundance and types across tissues.
• The venom composition within different tissues of sea anemones is largely uncharacterized.

Purpose of the Study:

• To characterize the venomous gene assemblage in specific tissues of three sea anemone species.
• To investigate tissue-specific variations in venom composition and toxin gene expression.
• To provide a framework for future functional gene studies in cnidarians.

Main Methods:

• Employed a tissue-specific RNA-sequencing (RNA-seq) approach.
• Analyzed venom composition in tentacles, mesenterial filaments, and column tissues.
• Utilized gene ontology (GO) analysis for differential gene expression.

Main Results:

• Significant variation in toxin-like gene abundance was observed across tissues and species.
• The column tissue consistently showed the lowest cumulative toxin abundance.
• Differential expression analysis revealed distinct GO groups between whole transcriptome and tissue-specific expression.

Conclusions:

• Sea anemone venom composition is highly variable across tissues and species.
• Tissue-specific gene expression analysis is crucial for understanding venom function.
• This research offers insights into the evolution of venom in simple-bodied animals.