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Time course study of Mediterranean mussel (M. galloprovincialis, Lmk, 1819) digestive gland treated with okadaic acid

ABSTRACT: Mytilus galloprovincialis (Lmk, 1819) is economically relevant bivalve specie. In Adriatic Sea, periodical temperatures increases define optimal growth conditions for Dinoflagellate spp which can reach high concentrations also in filter-feeding mussels, thus causing potential human health problems. The most commonly used methods for the detection of Diarrhoeic Shellfish Poisoning biotoxins have either a low sensitivity or are too expensive to be used for routine tests. Genomic tools, such as microarray platforms, provide a reliable and alternative solution to overcome these problems. In this study we used a mussel cDNA microarray for studying gene expression changes in mussels exposed to Okadaic acid. Mussels collected in the Gulf of Trieste, located in Northern Adriatic Sea, were fed with Okadaic acid-spiked invertebrates for five weeks. In a time course experiment we were able to describe an early acute response just from the first 4th day time point. Among the differentially expressed genes we found a general up-regulation of stress proteins and proteins involved in cellular synthesis. Overall, we identified 34 transcripts candidate as useful markers to monitor OA-induced stress in mussels. This study contributes to the characterization of many potential genetic markers that could be used in future environmental monitoring, and could lead to explore new mechanisms of stress tolerance in marine mollusc species. Keywords: Time course, stress response

ORGANISM(S): Mytilus galloprovincialis

PROVIDER: GSE14885 | GEO | 2009/02/19

SECONDARY ACCESSION(S): PRJNA111949

REPOSITORIES: GEO

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Time course study of Mediterranean mussel (M. galloprovincialis, Lmk, 1819) digestive gland treated with okadaic acid

Project description:Mytilus galloprovincialis (Lmk, 1819) is economically relevant bivalve specie. In Adriatic Sea, periodical temperatures increases define optimal growth conditions for Dinoflagellate spp which can reach high concentrations also in filter-feeding mussels, thus causing potential human health problems. The most commonly used methods for the detection of Diarrhoeic Shellfish Poisoning biotoxins have either a low sensitivity or are too expensive to be used for routine tests. Genomic tools, such as microarray platforms, provide a reliable and alternative solution to overcome these problems. In this study we used a mussel cDNA microarray for studying gene expression changes in mussels exposed to Okadaic acid. Mussels collected in the Gulf of Trieste, located in Northern Adriatic Sea, were fed with Okadaic acid-spiked invertebrates for five weeks. In a time course experiment we were able to describe an early acute response just from the first 4th day time point. Among the differentially expressed genes we found a general up-regulation of stress proteins and proteins involved in cellular synthesis. Overall, we identified 34 transcripts candidate as useful markers to monitor OA-induced stress in mussels. This study contributes to the characterization of many potential genetic markers that could be used in future environmental monitoring, and could lead to explore new mechanisms of stress tolerance in marine mollusc species. Keywords: Time course, stress response Loop Design experiment including 5 time points (T0 = control samples, T1 = 3 days post treatment, T2 = 1 week post treatment, T4 = 3 weeks post treatment, T6 = 5 weeks post treatment). 3 biological replicates were done for a total number of 15 samples

2010-05-05 | E-GEOD-14885 | biostudies-arrayexpress

Mytilus galloprovincialis, digestive gland and gill, exposed to Prorocentrum lima, producers of okadaic acid.

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Mytilus galloprovincialis, digestive gland and gill, exposed to Prorocentrum lima, producers of okadaic acid.

Project description:Differential expression analysis of digestive gland and gill tissues of mussels (Mytilus galloprovincialis) exposed to dinoflagellates (Prorocentrum lima), producers of okadaic acid, at a concentration of 200 cells/ml for one day. Each sample consists in total RNA was extracted from pooled tissues of 5 individuals. Two-color dye-swap direct comparison experiment: exposed vs non-exposed (treated vs control). Biological replicates: two treated replicates and two control replicates per tissue.

2015-11-19 | E-GEOD-72817 | biostudies-arrayexpress

Analysis of human liver transcriptome after exposure to okadaic acid

Project description:Purpose: Not much research has been done on the effects of okadaic acid on the liver, but it has been shown, that it not only reaches the liver, but has an especially long retention time in it. In this study, differentiated HepaRG cells were incubated bith different, non-cytotoxic okadaic acid concentrations for 24h and the total RNA was used for sequencing. Method: Transcriptomic responses were analyzed using RNA sequencing technology

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Project description:Okadaic acid (OA) is a marine biotoxin that can induce diarrheic shellfish poisoning upon consumption. It can accumulate in filter-feeding shellfish, thereby reaching the human food chain. In addition to inducing severe gastrointestinal symptoms, OA can pass the intestinal barrier into the bloodstream, thereby reaching the liver. However, the effects of OA on the liver have not been much in the focus of research so far. Therefore, this study now focuses on elucidating changes in the proteome of HepaRG cells induced by OA. Furthermore, as a potent phosphatase inhibitor, we expected changes in the phosphoproteome of the cells. Therefore, we further investigated the phosphoproteome of the HepaRG cells after OA exposure. Results revealed changes in enzyme activity regulation, cytoskeleton organization and energy metabolism.

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RNA-Seq of shallow-water mussel Mytilus galloprovincialis under in situ hydrostatic pressure exposure

Project description:Recent studies have unveiled the deep sea as a rich biosphere, populated by species descended from shallow-water ancestors post-mass extinctions. Research on genomic evolution and microbial symbiosis has shed light on how these species thrive in extreme deep-sea conditions. However, early adaptation stages, particularly the roles of conserved genes and symbiotic microbes, remain inadequately understood. This study examined transcriptomic and microbiome changes in shallow-water mussels Mytilus galloprovincialis exposed to deep-sea conditions at the Site-F cold seep in the South China Sea. Results reveal complex gene expression adjustments in stress response, immune defense, homeostasis, and energy metabolism pathways during adaptation. After 10 days of deep-sea exposure, shallow-water mussels and their microbial communities closely resembled those of native deep-sea mussels, demonstrating host and microbiome convergence in response to adaptive shifts. Notably, methanotrophic bacteria, key symbionts in native deep-sea mussels, emerged as a dominant group in the exposed mussels. Host genes involved in immune recognition and endocytosis correlated significantly with the abundance of these bacteria. Overall, our analyses provide insights into adaptive transcriptional regulation and microbiome dynamics of mussels in deep-sea environments, highlighting the roles of conserved genes and microbial community shifts in adapting to extreme environments.

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Bathymodiolus azoricus caging experiment

Project description:Colonization of deep-sea hydrothermal vents by invertebrates was made efficient through their adaptation to a symbiotic lifestyle with chemosynthetic bacteria, the primary producers of these ecosystems. Anatomical adaptations such as the establishment of specialized cells or organs have been evidenced in numerous deep-sea invertebrates. However, very few studies detailed global inter-dependencies between host and symbionts in these ecosystems. In this study, we proposed to describe, using a proteo-transcriptomic approach, the effects of symbionts on the deep-sea mussel Bathymodiolus azoricus’ molecular biology. We induced an in situ depletion of symbionts and compared the proteo-transcriptome of the gills of mussels in three conditions: symbiotic mussels (natural population), symbiont-depleted mussels and aposymbiotic mussels

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Argopecten irradians, gills, exposed to okadaic acid

Project description:Argopecten irradians, gills, exposed to okadaic acid

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