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Sodium channel mutation leading to saxitoxin resistance in clams increases risk of PSP

Par Conseil national de recherches du Canada

Autre titreSodium channel mutation responsible for saxitoxin resistance in clams increases risk of PSP
DOITrouver le DOI : https://doi.org/10.1038/nature03415
AuteurRechercher : 1; Rechercher : ; Rechercher : ; Rechercher : 1; Rechercher : ; Rechercher : ; Rechercher :
Affiliation
  1. Conseil national de recherches du Canada. Institut des biosciences marines du CNRC
FormatTexte, Article
Sujetbivalves; PSP; toxins; public health
Résumé
Bivalve molluscs, the primary vectors of paralytic shellfish poisoning (PSP) in humans, show marked inter-species variation in their capacity to accumulate PSP toxins (PSTs)1 which has a neural basis2, 3. PSTs cause human fatalities by blocking sodium conductance in nerve fibres4, 5. Here we identify a molecular basis for inter-population variation in PSP resistance within a species, consistent with genetic adaptation to PSTs. Softshell clams (Mya arenaria) from areas exposed to 'red tides' are more resistant to PSTs, as demonstrated by whole-nerve assays, and accumulate toxins at greater rates than sensitive clams from unexposed areas. PSTs lead to selective mortality of sensitive clams. Resistance is caused by natural mutation of a single amino acid residue, which causes a 1,000-fold decrease in affinity at the saxitoxin-binding site in the sodium channel pore of resistant, but not sensitive, clams. Thus PSTs might act as potent natural selection agents, leading to greater toxin resistance in clam populations and increased risk of PSP in humans. Furthermore, global expansion of PSP to previously unaffected coastal areas6 might result in long-term changes to communities and ecosystems.
Date de publication
Conditions d’utilisation
  • 2005 Nature Publishing Group
Dans
  • Nature 434, nº 7034 (7 avril 2005) : 763–767.
Langueanglais
Publications évaluées par des pairsOui
Numéro du CNRCNRCC 55500
1383
Numéro NPARC3538490
Exporter la noticeExporter en format RIS
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Identificateur de l’enregistrement854ab3a5-9f89-4556-b2f0-fc1e349c20a7
Enregistrement créé2009-03-01
Enregistrement modifié2020-04-07
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