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Toxic Relationships and Arms-Race Coevolution Revisited
G M Bucciarelli1,2, Farid Alsalek1, L B Kats3
1Department of Ecology and Evolutionary Biology, University of California, Los Angeles, California, USA; email: garyb@ucla.edu, faridalsalek@gmail.com, brad.shaffer@ucla.edu.
Annual Review of Animal Biosciences
|February 15, 2022
Summary
Animal toxin evolution is complex. This study examines tetrodotoxin (TTX) in Pacific newts, proposing a new model involving bacteria and elicitor-receptor dynamics for toxin evolution.
Area of Science:
- Evolutionary biology
- Chemical ecology
- Animal toxicology
Background:
- Toxin evolution in animals presents challenges due to diverse acquisition methods, adaptations, and environmental factors influencing phenotypes.
- Antagonistic interactions and coevolutionary dynamics significantly shape toxicity and resistance in animals.
Purpose of the Study:
- To explore genetic and ecological factors influencing animal toxin evolution.
- To investigate the evolution of tetrodotoxin (TTX) in Pacific newts (genus *Taricha*).
- To propose a novel coevolutionary model for TTX evolution and ecology.
Main Methods:
- Review of genetic and ecological factors in toxin evolution.
- Focus on Pacific newts as a model system for tetrodotoxin (TTX) research.
- Development of an alternative coevolutionary model incorporating bacterial symbionts.
Main Results:
- Tetrodotoxin (TTX) is a widely distributed toxin in Pacific newts.
- An arms-race coevolution model with snake predators is a common hypothesis for newt toxicity patterns.
- An alternative model incorporating TTX-producing bacteria and elicitor-receptor interactions is proposed.
Conclusions:
- Toxin evolution is influenced by complex genetic and ecological interactions.
- The proposed bacterial-based coevolutionary model offers a new perspective on TTX evolution in newts.
- Understanding TTX evolution requires considering microbial symbionts and molecular interactions.
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