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Toxin production in the dinoflagellate Protogonyaulax tamarensis
T Ogata1, M Kodama, T Ishimaru
1Laboratory of Marine Biological Chemistry, School of Fisheries Sciences, Kitasato University, Iwate, Japan.
Abstract:
Many clones of Protogonyaulax tamarensis were collected from Ofunato Bay in the same season and cultured under the same conditions. The toxicity of the cultured cells of these clones was remarkably different from each other (maximum of 100-fold). Significant differences (maximum of 20-fold) in toxicity of cultured cells were also observed among subclones isolated from a single clonal culture. It is unlikely that this variation in toxicity among subclones is due to mutation during culture. From these observations we suggest that toxin production in P. tamarensis is not a hereditary characteristic.
Insights
Toxin production in Protogonyaulax tamarensis (P. tamarensis) varies significantly between clones and even subclones. This suggests that toxin levels in P. tamarensis are not determined by hereditary traits.
Area of Science:
- Marine biology
- Microbiology
- Toxicology
Background:
- Protogonyaulax tamarensis is a marine dinoflagellate known to produce toxins.
- Understanding the factors influencing toxin production is crucial for managing harmful algal blooms.
Purpose of the Study:
- To investigate the variability in toxin production among different clones and subclones of Protogonyaulax tamarensis.
- To determine if toxin production is a hereditary characteristic in P. tamarensis.
Main Methods:
- Collection of multiple Protogonyaulax tamarensis clones from Ofunato Bay.
- Culturing of clones and subclones under identical conditions.
- Quantification of toxin levels in cultured cells.
Main Results:
- Significant differences in toxicity (up to 100-fold) were observed among different clones.
- Subclones from a single clone also exhibited substantial toxicity variations (up to 20-fold).
- Observed variations are unlikely to be due to mutations during culture.
Conclusions:
- Toxin production in Protogonyaulax tamarensis is highly variable.
- Toxin levels are not a stable, hereditary characteristic of P. tamarensis.
- Environmental or epigenetic factors may play a significant role in regulating toxin synthesis.