# Methods matter: Comparison of techniques used for sea anemone venom extraction

## TL;DR

This study compares three methods for extracting venom from sea anemones and finds that each method yields very different results, with isolated cnidae likely being the most accurate.

## Contribution

The first direct comparison of common sea anemone venom extraction methods and their impact on venom composition.

## Key findings

- Venom composition and abundance varied significantly between the three extraction methods.
- Only 1% of molecules were detected in venoms from all three extraction techniques.
- Venom from isolated cnidae is likely the most representative of true venom components.

## Abstract

The study of cnidarian (coral, sea anemone, and jellyfish) venom provides important evolutionary and ecological insights and unlocks vast opportunities for biodiscovery of novel compounds. The success of the field is dependent on not only the acquisition of sufficient quantities of venom but also the ability to compare venom between species and studies. To date, no direct comparison of the main techniques used to acquire sea anemone venom has been performed to determine the comparability or validity of these methods to yield venom derived from within cnidarian venom apparatus – cnidae. This study aims to compare the venom extracted from a sea anemone via three common methods: isolated cnidae, electrostimulation, and physical manipulation. Using a range of non-targeted proteomic and mass spectrometric techniques, we showed each method yielded distinct differences in both the composition and abundance of components detected for extraction method. Furthermore, few identified components were shared between each of the extraction methods. These results highlight that different venom collection methods yield vastly different results. While further investigation is required, to validate the source of each of the components from within each sample, we argue that sample collection from isolated cnidae is likely to be the most representative of true venom components.

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•Isolation of cnidae, electrostimulation, and physical manipulation are among common actiniarian venom collection methods.•This study aimed to assess the comparability of these methods.•Venom composition differed significantly across the three extraction methods.•1% of molecules were detected in venoms from all three extraction techniques.•Venom from isolated cnidae are likely to most represent true actiniarian venom.

Isolation of cnidae, electrostimulation, and physical manipulation are among common actiniarian venom collection methods.

This study aimed to assess the comparability of these methods.

Venom composition differed significantly across the three extraction methods.

1% of molecules were detected in venoms from all three extraction techniques.

Venom from isolated cnidae are likely to most represent true actiniarian venom.