Consulta: creatorFacets:"Viallon, Jérôme"
Registros recuperados: 4
Data/hora: 01/06/2024 05:45:51

Assessment of Ciguatera and Other Phycotoxin-Related Risks in Anaho Bay (Nuku Hiva Island, French Polynesia): Molecular, Toxicological, and Chemical Analyses of Passive Samplers
Provedor de dados: 5
Autores: Roué, Mélanie; Smith, Kirsty F.; Sibat, Manoella; Viallon, Jérôme; Henry, Kévin; Ung, André; Biessy, Laura; Hess, Philipp; Darius, Hélène Taiana; Chinain, Mireille.
Ciguatera poisoning is a foodborne illness caused by the consumption of seafood contaminated with ciguatoxins (CTXs) produced by dinoflagellates from the genera Gambierdiscus and Fukuyoa. The suitability of Solid Phase Adsorption Toxin Tracking (SPATT) technology for the monitoring of dissolved CTXs in the marine environment has recently been demonstrated. To refine the use of this passive monitoring tool in ciguateric areas, the effects of deployment time and sampler format on the adsorption of CTXs by HP20 resin were assessed in Anaho Bay (Nuku Hiva Island, French Polynesia), a well-known ciguatera hotspot. Toxicity data assessed by means of the mouse neuroblastoma cell-based assay (CBA-N2a) showed that a 24 h deployment of 2.5 g of resin allowed...
Tipo: Text
Palavras-chave: Ciguatera monitoring; Gambierdiscus; Ciguatoxins; SPATT passive samplers; HP20 resin; CBA-N2a; LC-MS; MS; WS artificial substrate; QPCR; HTS metabarcoding.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00629/74143/73670.pdf

Ostreopsis lenticularis Y. Fukuyo (Dinophyceae, Gonyaulacales) from French Polynesia (South Pacific Ocean): A revisit of its morphology, molecular phylogeny and toxicity
Provedor de dados: 5
Autores: Chomérat, Nicolas; Bilien, Gwenael; Derrien, Amelie; Henry, Kévin; Ung, André; Viallon, Jérôme; Darius, Hélène Taiana; Mahana Iti Gatti, Clémence; Roué, Mélanie; Hervé, Fabienne; Réveillon, Damien; Amzil, Zouher; Chinain, Mireille.
To date, the genus Ostreopsis comprises eleven described species, of which seven are toxigenic and produce various compounds presenting a major threat to human and environmental health. The taxonomy of several of these species however remains controversial, as it was based mostly on morphological descriptions leading, in some cases, to ambiguous interpretations and even possible misidentifications. The species Ostreopsis lenticularis was first described by Y. Fukuyo from French Polynesia using light microscopy observations, but without genetic information associated. The present study aims at revisiting the morphology, molecular phylogeny and toxicity of O. lenticularis based on the analysis of 47 strains isolated from 4 distinct locales of French...
Tipo: Text
Palavras-chave: ITS-5.8S rDNA; LSU rDNA; Microscopy; Ostreopsis lenticularis; Taxonomy; Toxins.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00486/59747/62887.pdf

Intraspecific Variability in the Toxin Production and Toxin Profiles of In Vitro Cultures of Gambierdiscus polynesiensis (Dinophyceae) from French Polynesia
Provedor de dados: 5
Autores: Longo, Sebastien; Sibat, Manoella; Viallon, Jérôme; Darius, Hélène Taiana; Hess, Philipp; Chinain, Mireille.
Ciguatera poisoning (CP) is a foodborne disease caused by the consumption of seafood contaminated with ciguatoxins (CTXs) produced by dinoflagellates in the genera Gambierdiscus and Fukuyoa. The toxin production and toxin profiles were explored in four clones of G. polynesiensis originating from different islands in French Polynesia with contrasted CP risk: RIK7 (Mangareva, Gambier), NHA4 (Nuku Hiva, Marquesas), RAI-1 (Raivavae, Australes), and RG92 (Rangiroa, Tuamotu). Productions of CTXs, maitotoxins (MTXs), and gambierone group analogs were examined at exponential and stationary growth phases using the neuroblastoma cell-based assay and liquid chromatography–tandem mass spectrometry. While none of the strains was found to produce known MTX compounds,...
Tipo: Text
Palavras-chave: Gambierdiscus polynesiensis; Ciguatera; Ciguatoxins; Gambierone; 44-methylgambierone; LC-MS/MS; CBA-N2a; Toxin profiles.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00599/71134/69449.pdf

Evidence for the Range Expansion of Ciguatera in French Polynesia: A Revisit of the 2009 Mass-Poisoning Outbreak in Rapa Island (Australes Archipelago)
Provedor de dados: 5
Autores: Chinain, Mireille; Mahana Iti Gatti, Clémence; Ung, André; Cruchet, Philippe; Revel, Taina; Viallon, Jérôme; Sibat, Manoella; Varney, Patrick; Laurent, Victoire; Hess, Philipp; Taiana Darius, Hélène.
Ciguatera poisoning (CP) results from the consumption of seafood contaminated with ciguatoxins (CTXs). This disease is highly prevalent in French Polynesia with several well-identified hotspots. Rapa Island, the southernmost inhabited island in the country, was reportedly free of CP until 2007. This study describes the integrated approach used to investigate the etiology of a fatal mass-poisoning outbreak that occurred in Rapa in 2009. Symptoms reported in patients were evocative of ciguatera. Several Gambierdiscus field samples collected from benthic assemblages tested positive by the receptor binding assay (RBA). Additionally, the toxicity screening of ≈250 fish by RBA indicated ≈78% of fish could contain CTXs. The presence of CTXs in fish was confirmed...
Tipo: Text
Palavras-chave: Ciguatera poisoning; French Polynesia; Gambierdiscus; Ciguatoxins; Epidemiology; Toxicological analyses; Risk management; Climate change.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00662/77362/78933.pdf