Biological Effects of Marine Toxins and Dinoflagellate Ecology

Dinoflagellates are unicellular protists that play a central role in marine ecosystems as both primary producers and potent toxin producers. Under favourable conditions, certain species proliferate rapidly, giving rise to harmful algal blooms that affect food webs, human health and coastal economies. The toxins generated by these organisms encompass diverse chemical classes, including polyethers, cyclic imines and saxitoxins, each targeting specific molecular pathways such as voltage-gated ion channels, phosphatases or cytoskeletal elements. Exposure to these compounds can lead to acute syndromes—such as paralytic, neurotoxic, diarrhetic and amnesic shellfish poisoning—and chronic outcomes including neurodegeneration and immunomodulation. Recent advances have elucidated biosynthetic gene clusters, toxin transport mechanisms and the ecological triggers that govern bloom dynamics. Integrating molecular, physiological and modelling approaches is key to predicting bloom events and mitigating toxin transfer through seafood, while exploring the therapeutic potential of these compounds as precision tools in biomedical research.

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Biological Effects of Marine Toxins and Dinoflagellate Ecology publication trend

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Technical terms

Dinoflagellate: A group of single-celled marine algae, some species of which produce potent biotoxins that can accumulate in food webs.

Phycotoxin: A toxic secondary metabolite produced by microalgae, often implicated in seafood poisoning syndromes.

Harmful algal bloom: A rapid increase in toxin-producing microalgae populations that can cause ecological damage and health risks.

Apoptosis: A form of programmed cell death characterised by chromatin condensation and caspase activation.

Biosynthetic gene cluster: A contiguous set of genes encoding enzymes responsible for the stepwise assembly of a specialised metabolite.

Voltage-gated ion channel: A membrane protein that opens or closes in response to changes in membrane potential, often targeted by neurotoxins.

References

1. Marine Polyether Phycotoxin Palytoxin Induces Apoptotic Cell Death via Mcl-1 and Bcl-2 Downregulation. Marine Drugs (2023).
2. Toxicological and Pharmacological Activities, and Potential Medical Applications, of Marine Algal Toxins. International Journal of Molecular Sciences (2024).
3. Phytoplankton Toxins and Their Potential Therapeutic Applications: A Journey toward the Quest for Potent Pharmaceuticals. Marine Drugs (2022).