Dinoflagellate Toxins

A special issue of Toxins (ISSN 2072-6651). This special issue belongs to the section "Marine and Freshwater Toxins".

Deadline for manuscript submissions: closed (31 March 2020) | Viewed by 8236

Special Issue Editor


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Guest Editor
Department of Marine Science, University of North Carolina Wilmington Center for Marine Science, 5600 Marvin K. Moss Lane, Wilmington, NC, 28409, USA

Special Issue Information

Dear Colleagues,

Almost a century ago, the source of the deadly marine toxin saxitoxin was finally discovered to be a dinoflagellate.  However it was many years after that before the chemical structure of saxitoxin was characterized. Following this breakthrough, additional saxitoxin congeners were reported, and many new and different dinoflagellate toxins were discovered. These toxins are structurally different from most other natural products, often displaying novel biological activity. Concurrently, the number of toxic dinoflagellate species has also expanded. Biochemical studies show that many of these dinoflagellate toxins are derived from acetate, albeit by novel non-traditional pathways that result in polyketides and hybrid polyketides representing linear, macrocyclic, and ladder-frame compounds. As the list of new dinoflagellate toxins and sources continues to grow, there is a two-fold outcome. Firstly, a compilation of these new toxins and their toxicity is critical for monitoring seafood safety, and secondly, their study will lead to a better understanding of the enzymatic and genetic factors that control their production.

Prof. Jeffrey L. Wright
Guest Editor

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Keywords

  • new structural classes
  • new structures
  • bioactivity
  • producing species
  • new locations
  • biosynthesis
  • genetics

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Published Papers (2 papers)

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Research

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11 pages, 2322 KiB  
Article
Detection and Spatio-Temporal Distribution of Pinnatoxins in Shellfish from the Atlantic and Cantabrian Coasts of Spain
by J. Pablo Lamas, Fabiola Arévalo, Ángeles Moroño, Jorge Correa, Susana Muñíz and Juan Blanco
Toxins 2019, 11(6), 340; https://doi.org/10.3390/toxins11060340 - 14 Jun 2019
Cited by 27 | Viewed by 3096
Abstract
For the first time, pinnatoxins have been detected in shellfish from the Atlantic and Cantabrian coasts of Spain. High sensitivity LC-MS/MS systems were used to monitor all the currently known pinnatoxins (A–H). Pinnatoxin G (PnTX G) was the most prevalent toxin of the [...] Read more.
For the first time, pinnatoxins have been detected in shellfish from the Atlantic and Cantabrian coasts of Spain. High sensitivity LC-MS/MS systems were used to monitor all the currently known pinnatoxins (A–H). Pinnatoxin G (PnTX G) was the most prevalent toxin of the group, but its metabolite PnTX A has also been found at much lower levels. No trend in PnTX G concentration was found in the area, but a hotspot in the Ría de Camariñas has been identified. The maximum concentrations found did not exceed 15 µg·kg−1, being, in most cases, below 3 µg·kg−1. The highest concentrations were found in wild (intertidal) populations of mussels which attained much higher levels than raft-cultured ones, suggesting that the toxin-producer organisms preferentially develop in shallow areas. Other bivalve species had, in general, lower concentrations. The incidence of PnTX G followed a seasonal pattern in which the maximum concentrations took place in winter months. PnTX G was found to be partially esterified but the esterification percentage was not high (lower than 30%). Full article
(This article belongs to the Special Issue Dinoflagellate Toxins)
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Review

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21 pages, 1728 KiB  
Review
Ciguatera Fish Poisoning: The Risk from an Aotearoa/New Zealand Perspective
by Lesley L. Rhodes, Kirsty F. Smith, J. Sam Murray, Tomohiro Nishimura and Sarah C. Finch
Toxins 2020, 12(1), 50; https://doi.org/10.3390/toxins12010050 - 15 Jan 2020
Cited by 29 | Viewed by 4714
Abstract
Gambierdiscus and Fukuyoa species have been identified in Aotearoa/New Zealand’s coastal waters and G. polynesiensis, a known producer of ciguatoxins, has been isolated from Rangitāhua/Kermadec Islands (a New Zealand territory). The warming of the Tasman Sea and the waters around New Zealand’s [...] Read more.
Gambierdiscus and Fukuyoa species have been identified in Aotearoa/New Zealand’s coastal waters and G. polynesiensis, a known producer of ciguatoxins, has been isolated from Rangitāhua/Kermadec Islands (a New Zealand territory). The warming of the Tasman Sea and the waters around New Zealand’s northern subtropical coastline heighten the risk of Gambierdiscus proliferating in New Zealand. If this occurs, the risk of ciguatera fish poisoning due to consumption of locally caught fish will increase. Research, including the development and testing of sampling methods, molecular assays, and chemical and toxicity tests, will continue. Reliable monitoring strategies are important to manage and mitigate the risk posed by this emerging threat. The research approaches that have been made, many of which will continue, are summarised in this review. Full article
(This article belongs to the Special Issue Dinoflagellate Toxins)
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