Consulta: creatorFacets:"Robino, Etienne"
Registros recuperados: 3
Data/hora: 02/06/2024 12:36:32

Resistance of the oyster pathogen   Vibrio tasmaniensis   LGP32 against grazing by   Vannella sp   . marine amoeba involves Vsm and CopA virulence factors
Provedor de dados: 5
Autores: Robino, Etienne; Poirier, Aurore C.; Amraoui, Hajar; Le Bissonnais, Sandra; Perret, Angelique; Lopez‐joven, Carmen; Auguet, Jean-christophe; Rubio, Tristan P.; Cazevieille, Chantal; Rolland, Jean-luc; Héchard, Yann; Destoumieux‐garzón, Delphine; Charrière, Guillaume.
ibrios are ubiquitous in marine environments and opportunistically colonize a broad range of hosts. Strains of Vibrio tasmaniensis present in oyster farms can thrive in oysters during juvenile mortality events and behave as facultative intracellular pathogen of oyster hemocytes. Herein, we wondered whether V. tasmaniensis LGP32 resistance to phagocytosis is specific to oyster immune cells or contributes to resistance to other phagocytes, like marine amoebae. To address this question, we developed an integrative study, from the first description of amoeba diversity in oyster‐farms to the characterization of LGP32 interactions with amoebae. An isolate of the Vannella genus, Vannella sp. AP1411, which was collected from oyster farms, is ubiquitous, and...
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00509/62109/66292.pdf

Etude des amibes marines et de leurs interactions avec les vibrios pathogènes d’huître
Provedor de dados: 5
Autores: Robino, Etienne.
Free living amoebae inhabit aquatic environments and use phagocytosis of bacteria for their nutrition. According to the hypothesis of coincidental evolution of virulence, the cellular and molecular mechanisms of phagocytosis being preserved from amoebae to the immune cells of animals, the predation exerted by amoebae could favor the emergence of pathogenic bacteria resistant to phagocytosis. Since 2008, Crassostrea gigas oysters have suffered from over-mortality in France. This poly-microbial disease involves the Herpes OsHV-1 μvar virus which causes an immunosuppression of oysters that are then colonized by various opportunistic pathogenic bacteria including vibrios inducing the death of the animal. V. tasmaniensis LGP32 is a facultative intracellular...
Tipo: Text
Palavras-chave: Amibes libres; Vibrios pathogènes; Phagocytose; Évolution fortuite; Diversité; Free-Living amoebae; Pathogenic vibrios; Phagocytosis; Coincidental evolution; Diversity.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00692/80419/83555.pdf

Vibrio splendidus   O-antigen structure: A trade-off between virulence to oysters and resistance to grazers
Provedor de dados: 5
Autores: Oyanedel, Daniel; Labreuche, Yannick; Bruto, Maxime; Amraoui, Hajar; Robino, Etienne; Haffner, Philippe; Rubio, Tristan; Charrière, Guillaume; Le Roux, Frederique; Destoumieux-garzón, Delphine.
A major debate in evolutionary biology is whether virulence is maintained as an adaptive trait and/or evolves to non‐virulence. In the environment, virulence traits of non‐obligatory parasites are subjected to diverse selective pressures and trade‐offs. Here we focus on a population of Vibrio splendidus that displays moderate virulence for oysters. A MARTX (Multifunctional‐autoprocessing repeats‐in‐toxin) and a type‐six secretion system (T6SS) were found to be necessary for virulence toward oysters, while a region (wbe) involved in O‐antigen synthesis is necessary for resistance to predation against amoebae. Gene inactivation within the wbe region had major consequences on the O‐antigen structure, conferring lower immunogenicity, competitive advantage and...
Tipo: Text
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00619/73070/72194.pdf