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... In bivalves, no clear-cut functional role of microbiota has yet been identified, although many publications suggest that they could be involved in nutrition or immunity of their host. In the context of climate change, integrative approaches at the crossroads of disciplines have been developed to explore the environment-host-pathogen-microbiota system. Here, we attempt to synthesize work on (1) the ...
ChristinePaillard, et al. ; Alexandra Rahmani; Maaike Vercauteren; Katleen Vranckx; Filip Boyen; Adeline Bidault; Vianney Pichereau; Annemie Decostere; Koen Chiers; Show all 9 Authors
Ruditapes philippinarum; Vibrio tapetis; adhesion; avirulent strains; bacteria; cell adhesion; clams; cost effectiveness; environmental monitoring; fish; genes; hemocytes; matrix-assisted laser desorption-ionization mass spectrometry; pathogens; protein composition; quantitative polymerase chain reaction; type IV secretion system; virulence; Belgium
Abstract:
... Vibrio tapetis, the etiological agent of Brown Ring Disease, mainly affects the Manila clam Ruditapes philippinarum. Although this bacterium is mainly known as a clam pathogen, it has been isolated from several fish species. The main aim of the present study was to further explore the variability of 27 V. tapetis isolates from bivalves and fish, considering three different aspects; in vitro virule ...
... The Brown Ring Disease is an infection caused by the bacterium Vibrio tapetis on the Manila clam Ruditapes philippinarum. The process of infection, in the extrapallial fluids (EPFs) of clams, involves alteration of immune functions, in particular on hemocytes which are the cells responsible of phagocytosis. Disorganization of the actin-cytoskeleton in infected clams is a part of what leads to this ...
ChristinePaillard, et al. ; Amandine Morot; Sahar El Fekih; Adeline Bidault; Alizée Le Ferrand; Albane Jouault; Javid Kavousi; Alexis Bazire; Vianney Pichereau; Alain Dufour; François Delavat; Show all 11 Authors
... Environmental Vibrio strains represent a major threat in aquaculture, but the understanding of their virulence mechanisms heavily relies on the transposition of knowledge from human‐pathogen vibrios. Here, the genetic bases of the virulence of Vibrio harveyi ORM4 towards the European abalone Haliotis tuberculata were characterized. We demonstrated that luxO, encoding a major regulator of the quoru ...
... Vibrio campbellii BAA-1116 is renowned for its bioluminescence properties, and genetic tools are available to genetically track this strain. However, many other ecologically important V. harveyi strains exist, for which only few genetic tools are available. In this study, a rapid electroporation protocol was developed to transform replicative plasmids in various environmental V. harveyi and Pseudo ...
... Stable associations between marine invertebrates and their chemosynthetic bacterial symbionts are predicated on both the adequate transfer of resources and the restriction of bacterial cells to a finite population within host tissues. In symbioses between thyasirid bivalves and thiotrophic bacteria, symbionts are extracellular, acquired from a free-living pool, and periodically endocytosed and dig ...
ChristinePaillard, et al. ; Nathalie Wessel; Sophie Martin; Aïcha Badou; Philippe Dubois; Sylvain Huchette; Vivien Julia; Flavia Nunes; Ewan Harney; Stéphanie Auzoux-Bordenave; Show all 10 Authors
... Ocean acidification is a major global stressor that leads to substantial changes in seawater carbonate chemistry, with potentially significant consequences for calcifying organisms. Marine shelled mollusks are ecologically and economically important species providing essential ecosystem services and food sources for other species. Because they use calcium carbonate (CaCO₃) to produce their shells, ...
... Vibrio tapetis CECT4600 is a pathogenic Gram-negative bacterium causing the brown ring disease in the Manila clam Ruditapes philippinarum. This vibriosis is induced by bacterial attachment on the periostracal lamina, yielding a decalcification of the bivalve shell. As in many bacterial species, pathogenesis is likely related to biofilm formation. The proteinaceous exoproducts of the marine bacteri ...
... Since 1997, populations of the European abalone Haliotis tuberculata suffer mass mortalities attributed to the bacterium Vibrio harveyi. These mortalities occur at the spawning season, when the abalone immune system is depressed, and when temperatures exceed 17 °C, leading to favorable conditions for V. harveyi proliferation. In order to identify mechanisms of disease resistance, experimental succ ...
ChristinePaillard, et al. ; Aide Lasa; Andrea di Cesare; Giovanni Tassistro; Alessio Borello; Stefano Gualdi; Dolors Furones; Noelia Carrasco; Deborah Cheslett; Amanda Brechon; Adeline Bidault; Fabrice Pernet; Laura Canesi; Paolo Edomi; Alberto Pallavicini; Carla Pruzzo; Luigi Vezzulli; Show all 17 Authors
... Infectious agents such as the bacteria Vibrio aestuarianus or Ostreid herpesvirus 1 have been repeatedly associated with dramatic disease outbreaks of Crassostrea gigas beds in Europe. Beside roles played by these pathogens, microbial infections in C. gigas may derive from the contribution of a larger number of microorganisms than previously thought, according to an emerging view supporting the po ...
... Vibrio harveyi is a marine bacterial pathogen responsible for episodic abalone mortalities in France, Japan and Australia. In the European abalone, V. harveyi invades the circulatory system in a few hours after exposure and is lethal after 2 days of infection. In this study, we investigated the responses of European abalone immune cells over the first 24 h of infection. Results revealed an initial ...
... We investigated the effect of brown ring disease (BRD) development and algal diet on energy reserves and activity of enzymes related to energy metabolism, antioxidant system and immunity in Manila clam, Ruditapes philippinarum. We found that algal diet did not impact the metabolic response of clams exposed to Vibrio tapetis. At two days post-injection (dpi), activities of superoxide dismutase and ...
... Severe drop in Manila clams production in French aquacultured fields since the end of the 1980’s is associated to Brown Ring Disease (BRD). This disease, caused by the bacteria Vibrio tapetis, is characterized by specific symptoms on the inner face of the shell. Diseased animals develop conchiolin deposit to enrobe bacteria and form new calcified layers on the shell. Suppression subtractive hybrid ...
... Manila clams, Venerupis philippinarum (Adams and Reeve, 1850), were experimentally infected with two different bacterial strains and challenged with two different temperatures. Bacterial strains used in this study were Vibrio tapetis strain CECT4600T, the causative agent of Brown Ring Disease (BRD) and V. tapetis strain LP2, supposed less virulent to V. philippinarum. V. tapetis is considered to p ...
... Along French coasts, the abalone Haliotis tuberculata is affected by mass mortality events caused by both immune depression and the pathogen Vibrio harveyi. During this immune depression various immune parameters have been monitored including phenoloxidase (PO) activity, which significantly decreases. Nevertheless the basal PO activity level, to date, has not been characterized biochemically and t ...
... The Manila clam, Ruditapes philippinarum can become infected by the bacterium Vibrio tapetis which causing the Brown Ring Disease along North European Atlantic coasts. Variations in clam immune parameters have been reported in clam challenged with V. tapetis but no studies have been done on Nitric Oxide (NO) production. NO is a toxic agent to pathogens produced mostly by immune cells such as hemoc ...
... Wild or farmed abalone are regularly exposed to stressors, such as air exposure and handling. Immune and transcriptional responses as well as susceptibility to vibriosis of sexually mature or immature European abalone acclimated at 16 or 19 °C were determined following handling or air exposure. Hemocyte density and H2O2 production increased while hemocyte viability and phagocytic index decreased f ...
... The Manila clam, Ruditapes philippinarum, is an economically-important, commercial shellfish; harvests are diminished in some European waters by a pathogenic bacterium, Vibrio tapetis, that causes Brown Ring disease. To identify molecular characteristics associated with susceptibility or resistance to Brown Ring disease, Suppression Subtractive Hybridization (SSH) analyzes were performed to constr ...
ChristinePaillard, et al. ; Ewan Harney; Bruno Dubief; Pierre Boudry; Olivier Basuyaux; Markus B. Schilhabel; Sylvain Huchette; Flavia L.D. Nunes; Show all 8 Authors
... The European abalone Haliotis tuberculata is a delicacy and consequently a commercially valuable gastropod species. Aquaculture production and wild populations are subjected to multiple climate-associated stressors and anthropogenic pressures, including rising sea-surface temperatures, ocean acidification and an emerging pathogenic Vibrio infection. Transcript expression data provides a valuable r ...
... The phenoloxidases (POs) include tyrosinases (EC 1.14.18.1), catecholases (EC 1.10.3.1) and laccases (EC 1.10.3.2) and are known to play a role in the immune defences of many invertebrates. For the Manila clam, Venerupis philippinarum, the exact role is not known, especially with regard to defences against Brown Ring Disease (BRD), which leads to high mortalities along European coasts. In order to ...