Long-term affected flat oyster (Ostrea edulis) haemocytes show differential gene expression profiles from naïve oysters in response to Bonamia ostreae

European flat oyster (Ostrea edulis) production has suffered a severe decline due to bonamiosis. The responsible parasite enters in oyster haemocytes, causing an acute inflammatory response frequently leading to death. We used an immune-enriched oligo-microarray to understand the haemocyte response to Bonamia ostreae by comparing expression profiles between naïve (NS) and long-term affected (AS) populations … Continue reading Long-term affected flat oyster (Ostrea edulis) haemocytes show differential gene expression profiles from naïve oysters in response to Bonamia ostreae

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Metabolomics study of immune responses of New Zealand Greenshell™ mussels (Perna canaliculus) infected with pathogenic Vibrio sp.

Vibrio coralliilyticus is a bacterial pathogen which can affect a range of marine organisms, such as corals, fish and shellfish, with sometimes devastating consequences. However, little is known about the mechanisms involved in the host-pathogen interaction, especially within molluscan models. We applied gas chromatography-mass spectrometry (GC-MS)-based metabolomics to characterize the physiological responses in haemolymph of … Continue reading Metabolomics study of immune responses of New Zealand Greenshell™ mussels (Perna canaliculus) infected with pathogenic Vibrio sp.

Inefficient immune response is associated with microbial permissiveness in juvenile oysters affected by mass mortalities on field

Since 2008, juvenile Crassostrea gigas oysters have suffered from massive mortalities in European farming areas. This disease of complex etiology is still incompletely understood. Triggered by an elevated seawater temperature, it has been associated to infections by a herpes virus named OsHV-1 as well as pathogenic vibrios of the Splendidus clade. Ruling out the complexity … Continue reading Inefficient immune response is associated with microbial permissiveness in juvenile oysters affected by mass mortalities on field

CO2-induced ocean acidification impairs the immune function of the Pacific oyster against Vibrio splendidus challenge: An integrated study from a cellular and proteomic perspective

Ocean acidification (OA) and pathogenic diseases pose a considerable threat to key species of marine ecosystem. However, few studies have investigated the combined impact of reduced seawater pH and pathogen challenge on the immune responses of marine invertebrates. In this study, Pacific oysters, Crassostrea gigas, were exposed to OA (~2000 ppm) for 28 days and then challenged … Continue reading CO2-induced ocean acidification impairs the immune function of the Pacific oyster against Vibrio splendidus challenge: An integrated study from a cellular and proteomic perspective

Molecular characterization of complement component 3 (C3) in Mytilus coruscus improves our understanding of bivalve complement system

Complement component 3 (C3) plays a central role in the complement system whose activation is essential for all the important functions performed by this system. Here, a novel C3 gene, termed Mc-C3, was identified from thick shell mussel (Mytilus coruscus). The deduced Mc-C3 protein possessed the characteristic structure features present in its homologs and contained … Continue reading Molecular characterization of complement component 3 (C3) in Mytilus coruscus improves our understanding of bivalve complement system

Antiviral defense and innate immune memory in the oyster

The Pacific oyster, Crassostrea gigas, is becoming a valuable model for investigating antiviral defense in the Lophotrochozoa superphylum. In the past five years, improvements to laboratory-based experimental infection protocols using Ostreid herpesvirus I (OsHV-1) from naturally infected C. gigas combined with next-generation sequencing techniques has revealed that oysters have a complex antiviral response involving the … Continue reading Antiviral defense and innate immune memory in the oyster

Bivalve transcriptomics reveal pathogen sequences and a powerful immune response of the Mediterranean mussel (Mytilus galloprovincialis)

Bivalves have colonized the interface between land and sea for the last 500 million years. Although bivalves lack an adaptive immune system, they are extraordinarily well adapted to adverse environmental conditions. Bivalves are valuable aquaculture resources worldwide and are used as sentinels for monitoring pollution. In this work, the immune transcriptomes of mussels (Mytilus galloprovincialis … Continue reading Bivalve transcriptomics reveal pathogen sequences and a powerful immune response of the Mediterranean mussel (Mytilus galloprovincialis)