Carcinogenic Compounds in Bracken Fern Ecosystems
Summary
Bracken fern (Pteridium spp.) thrives in temperate, subtropical and tropical regions, yet harbours potent carcinogenic secondary metabolites that pose risks to human and animal health. Chief among these compounds are illudane-type glycosides, notably ptaquiloside, which is water-soluble and readily washed from foliage into soil and watercourses. Upon activation, ptaquiloside generates electrophilic species capable of alkylating DNA and forming mutagenic adducts. Environmental factors such as rainfall patterns, fern growth stage and soil characteristics determine the extent of toxin mobilisation, with episodic leaching events elevating groundwater and surface water concentrations. Exposure pathways include ingestion of contaminated water, consumption of bracken or animal products from bracken-fed livestock, and inhalation of aerosolised spores or dust. Co-carcinogenic interactions with infectious agents can amplify genotoxic effects, linking bracken ecosystems to a spectrum of cancers in humans and livestock worldwide. Understanding the production, fate and molecular toxicity of these compounds is critical for risk assessment, land management and the development of mitigation strategies.
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Carcinogenic Compounds in Bracken Fern Ecosystems publication trend
The graph below shows the total number of articles in carcinogenic compounds in bracken fern ecosystems across all publications each year (not limited to Nature Index journals).
Technical terms
Illudane-type glycoside: A class of fungal-derived glycosides produced by ferns; capable of forming reactive intermediates that alkylate biomolecules.
Ptaquiloside: The predominant carcinogenic illudane glycoside in bracken fern, water-soluble and prone to environmental mobilisation.
DNA adduct: A covalent modification of DNA bases by electrophilic agents, potentially leading to mutagenesis if left unrepaired.
Co-carcinogenesis: The process by which a chemical agent and a biological pathogen interact synergistically to enhance cancer risk.
References
- Modeling the environmental fate of bracken toxin ptaquiloside: Production, release and transport in the rhizosphere. The Science of The Total Environment (2024).
- Sixty years of research on bracken fern (Pteridium spp.) toxins: Environmental exposure, health risks and recommendations for bracken fern control. Environmental Research (2024).
- Bracken Fern Carcinogen, Ptaquiloside, Forms a Guanine O 6‑Adduct in DNA. Journal of Agricultural and Food Chemistry (2025).
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