Oyster Farming, Temperature, and Plankton Influence the Dynamics of Pathogenic Vibrios in the Thau Lagoon

Vibrio species have been associated with recurrent mass mortalities of juvenile oysters Crassostrea gigas threatening oyster farming worldwide. However, knowledge of the ecology of pathogens in affected oyster farming areas remains scarce. Specifically, there are no data regarding (i) the environmental reservoirs of Vibrio populations pathogenic to oysters, (ii) the environmental factors favoring their transmission, … Continue reading Oyster Farming, Temperature, and Plankton Influence the Dynamics of Pathogenic Vibrios in the Thau Lagoon

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Ecologically realistic model of infection for exploring the host damage caused by Vibrio aestuarianus

Although vibrios are frequently associated with marine organisms mortality outbreaks, knowledge on their ecology and pathogenicity is sparse, thus limiting disease management and prophylactic strategies. Here, we investigated V. aestuarianus infection onset and progression in the wild, taking advantage of a ‘claire’ pond: a semi‐closed system with limited seawater renewal, theoretically more adapted to disease … Continue reading Ecologically realistic model of infection for exploring the host damage caused by Vibrio aestuarianus

A vital ubiquitin-conjugating enzyme CgUbe2g1 participated in regulation of immune response of Pacific oyster Crassostrea gigas

As an important post-translational protein modification, ubiquitination has been demonstrated to play a vital role in immune response of vertebrates. Ubiquitin (Ub)-conjugating enzyme E2 is the “heart” of ubiquitination, which is responsible for Ub cellular signaling and substrate modification. In the present study, an Ub-conjugating enzyme E2 (designed as CgUbe2g1) was identified from oyster Crassostrea … Continue reading A vital ubiquitin-conjugating enzyme CgUbe2g1 participated in regulation of immune response of Pacific oyster Crassostrea gigas

Tetracycline resistance gene tet(M) of a marine bacterial strain is not accumulated in bivalves from seawater in clam tank experiment and mussel monitoring

Antibiotic resistance genes (ARGs) are found in marine as well as terrestrial bacteria. Bivalves are known to accumulate chemical pollutants and pathogenic microbes, however, the fate of ARGs in bivalves after the intake of ARG-possessing bacteria is not known. Here we show that the copy number of oxytetracycline resistance gene tet(M) increased rapidly in the … Continue reading Tetracycline resistance gene tet(M) of a marine bacterial strain is not accumulated in bivalves from seawater in clam tank experiment and mussel monitoring

Complete Genome Sequence of Vibrio coralliilyticus RE22, a Marine Bacterium Pathogenic toward Larval Shellfish

Vibrio coralliilyticus RE22 is an indigenous marine pathogen that infects larval bivalve shellfish. This strain is particularly problematic in oyster hatcheries, where it causes high larval mortality. It contains two circular chromosomes and one megaplasmid. Annotation reveals multiple genes which may encode important virulence factors. Gary P. Richards, Brewster F. Kingham, Olga Shevchenko, Michael A. … Continue reading Complete Genome Sequence of Vibrio coralliilyticus RE22, a Marine Bacterium Pathogenic toward Larval Shellfish

Tissue-specific immune responses to Vibrio sp. infection in mussels (Perna canaliculus): A metabolomics approach

While tissue-specific immune responses are well-understood in mammals, such studies are lacking for marine bivalves. In this study, we investigated immune responses in gill, hepatopancreas and haemolymph of mussels (Perna canaliculus Gmelin, 1791) following experimental infection with Vibrio sp. DO1 (V. coralliilyticus/neptunius-like isolate). Significant differences in metabolite profiles and metabolic responses between tissues were observed. … Continue reading Tissue-specific immune responses to Vibrio sp. infection in mussels (Perna canaliculus): A metabolomics approach

Exposure to 2,3,7,8-tetrachlorodibenzo-paradioxin (TCDD) hampers the host defense capability of a bivalve species, Tegillarca granosa

Though increasing reports of deleterious impacts of dioxins and polychlorinated biphenyls (PCBs) on a variety of marine organisms have been described, their effects on the host defense capability of marine bivalve mollusks remain poorly understood. In the present study we used 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) as a representative of dioxins and PCBs to investigate its impacts on … Continue reading Exposure to 2,3,7,8-tetrachlorodibenzo-paradioxin (TCDD) hampers the host defense capability of a bivalve species, Tegillarca granosa