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Prey Shifts Drive Venom Evolution in Cone Snails.
Thomas Lund Koch1, Samuel D Robinson2,3, Paula Flórez Salcedo4
1Department of Biochemistry, University of Utah, Salt Lake City, UT 84112, USA.
Molecular Biology and Evolution
|June 27, 2024
Summary
Prey shifts drive venom variation in cone snails, with piscivorous species evolving more potent venom. This research offers insights into venom evolution and potential drug discovery.
Area of Science:
- Evolutionary biology
- Molecular biology
- Marine biology
Background:
- Venom systems are complex, evolving independently across diverse taxa.
- Interspecific variation in venom composition is influenced by factors like phylogeny and diet.
- Cone snails (genus Conus) offer a rich system to study venom variation due to species diversity and prey shifts.
Purpose of the Study:
- To investigate the role of prey-specific selection pressures in shaping venom variation within cone snails.
- To understand the mechanisms driving venom diversification in the genus Conus.
Main Methods:
- Analysis of venom gland expression profiles for approximately 3,000 toxin genes across 42 cone snail species.
- Comparative analysis of overall venom composition and individual toxin structures.
- In vivo testing of venom potency in fish models.
Main Results:
- Distinct changes in venom composition were observed correlating with shifts from vermivory to piscivory, independent of phylogeny.
- Venom from piscivorous cone snails exhibited higher potency in fish compared to non-piscivore venom.
- Evidence suggests prey-specific selection pressures are a significant driver of venom evolution.
Conclusions:
- Prey shifts are a primary driver of venom composition and diversification in cone snails.
- Understanding venom variation has implications for antivenom development and drug discovery.
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