Émergence et expansion clonale des lignées de Vibrio aestuarianus pathogènes pour les huîtres en Europe

Des chercheurs de l'IHPE ont publié dans Molecular Ecology en mars qu'ils ont identifié une île spécifique contenant des cus-cop conférant une résistance au cuivre à Va francensis dont l'acquisition pourrait avoir favorisé l'émergence de lignées pathogènes adaptées et spécialisées aux huîtres.

"Crassostrea gigas oysters represent a significant global food source with 4.7 million tons harvested per year. In 2001, the bacterium Vibrio aestuarianus subsp. francensis emerged as a pathogen that causes adult oyster mortality in France and Ireland. Its impact on oyster aquaculture has increased in Europe since its re-emergence in 2012.

To better understand the evolutionary mechanisms leading to the emergence and persistence over time of this pathogen, we conducted a survey of mollusc diseases through national reference laboratories across Europe.

We analysed 54 new genomes of Vibrio aestuarianus (Va) isolated from multiple environmental compartments since 2001, in areas with and without bivalve mortalities. We used a combination of comparative genomics and population genetics approaches and show that Va has a classical epidemic population structure from which the pathogenic Va francensis subspecies emerged and clonally expanded.

Furthermore, we identified a specific cus-cop-containing island conferring copper resistance to Va francensis whose acquisition may have favoured the emergence of pathogenic lineages adapted and specialized to oysters."

Voir aussi

Mesnil A, Jacquot M, Garcia C, Destoumieux-Garzón D, Travers MA. (2023)
Molecular Ecology . 2023 Mar 1. https://doi.org/10.1111/mec.16910
Emergence and clonal expansion of Vibrio aestuarianus lineages pathogenic for oysters in Europe


Date de modification : 23 janvier 2024 | Date de création : 23 janvier 2024 | Rédaction : Tulip Communication, Marie-Agenes Travers