Botulinum Neurotoxin (BoNT)
Definition
The most potent toxin known by weight. Produced by Clostridium botulinum in anaerobic low-acid food (improperly canned, smoked or fermented). Blocks acetylcholine release at the neuromuscular junction. Detected by ELISA, mouse bioassay (historical) and endopeptidase assay.
- Potency
- Most potent toxin known by weight
- Source organism
- Clostridium botulinum, anaerobic conditions
- Typical vehicle
- Improperly canned, smoked or fermented low-acid food
- Mechanism
- Blocks acetylcholine release at the neuromuscular junction
- Detection methods
- ELISA, endopeptidase assay, historical mouse bioassay
Common questions
Why has the mouse bioassay been phased out in favour of the endopeptidase assay?+
The mouse bioassay requires live animal use, takes days to produce a result, and raises welfare and ethical concerns. The endopeptidase assay detects BoNT's enzymatic cleavage activity on its target protein in vitro, giving a faster result without live animals, though some laboratories still keep the bioassay as a confirmatory reference method.
What clinical signs distinguish botulism from other forms of food poisoning?+
Botulism produces a descending flaccid paralysis, starting with cranial nerve symptoms such as double vision, drooping eyelids, and difficulty swallowing, rather than the gastrointestinal-dominant symptoms typical of bacterial toxins like Staphylococcus aureus or Bacillus cereus, which points investigators toward BoNT testing specifically.
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