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Community assembly in cod larvae

ABSTRACT: Microbial community assembly in Atlantic cod larvae (Gadus morhua): Contributions of ecological processes and metacommunity structure

PROVIDER: PRJEB39017 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	ERR4288730_1.fastq.gz	Fastqsanger.gz
	ERR4288730_2.fastq.gz	Fastqsanger.gz
	ERR4288740_1.fastq.gz	Fastqsanger.gz
	ERR4288740_2.fastq.gz	Fastqsanger.gz
	ERR4288750_1.fastq.gz	Fastqsanger.gz

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Microarray analysis of gene expression of Atlantic cod from different Baltic Sea regions

Project description:The Atlantic cod (Gadus morhua L.) is one of the most important species in the Baltic Sea with high ecological and economical value. To explore the differences in adaptation to salinity between Baltic cod from different regions, western (Kiel Bight) and eastern (Gdańsk Bay) samples were analyzed through oligonucleotide microarray.

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Diverse transcriptome response to salinity change in cod subpopulations from the Baltic Sea

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Project description:Aquaculture is one of the fastest growing food production sectors in the world and further expansion is expected throughout the 21st century. However, climate change is threatening the development of the sector and action is needed to prepare the industry for the coming challenges. Using downscaled temperature projections based on the Intergovernmental Panel on Climate Change (IPCC) climate projection (Shared Socioeconomic Pathway, SSP2-4.5), we analysed potential future temperatures at a selected Atlantic cod (Gadus morhua L.) farm site in Northern Norway. Results showed that the farming area may experience increased temperatures the next 10–15 years, including more days with temperatures above 17°C. Based on the predicted future conditions, we designed a study with Atlantic cod (Gadus morhua L.) to evaluate effects from high temperature alone and in combination with Fransicella noatunensis infection. Fish were kept at 12°C and 17°C for eight weeks and samples of skin and spleen collected at different timepoints were analysed with transcriptomics, histology, scanning electron microscopy and immunohistochemistry.

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Effects on the lipid metabolism of Atlantic cod (Gadus morhua) after in vivo exposure with Ppar agonists

Project description:Lipid metabolism is essential in maintaining energy homeostasis in multicellular organisms. In vertebrates, the peroxisome proliferator-activated receptors (PPARs, NR1C) regulate the expression of many genes involved in these processes. Four Ppar subtypes from Atlantic cod (Gadus morhua) were recently cloned and characterized. However, the downstream regulatory role of Ppars in cod lipid metabolism is presently not well understood or described. Here we study the involvement of Atlantic cod Ppar subtypes in systemic regulation of lipid metabolism using the model agonists WY14,643, GW501516, and tetradecylthioacetic acid, employing a multiple omics approach after an in vivo exposure situation.

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The study of Atlantic cod (Gadus morhua) spleen global gene expression response to intraperitoneal injection with formalin-killed atypical Aeromonas salmonicida.

Project description:This study was performed to validate the newly developed CGP Atlantic cod 20K oligonucleotide microarray. Atlantic cod (Gadus morhua) received an intraperitoneal injection of either formalin-killed, atypical Aeromonas salmonicida (Asal) or PBS and transcriptional profiles of spleen tissues from Asal-injected fish were compared to those from pre-injection control fish and PBS-injected control fish. Gene expression profiles resulting from this study were compared to those from suppression subtractive hybridization library studies, that were previously performed on the same samples, and to literature. Gene expression patterns of single genes were confirmed by QPCR analysis. This study has shown that the newly developed CGP Atlantic cod 20K oligo microarray platform is a valuable tool for cod genomic research.

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Quantitative proteomics of liver from methylmercury-exposed Atlantic cod

Project description:In order to investigate the underlying mechanisms of methylmecury (MeHg)-mediated toxicity to Atlantic cod (Gadus morhua), we analyzed the liver proteome of fish exposed in vivo to MeHg (0, 0.5, 2 mg/kg body weight) for 2 weeks. Label-free quantitative mass spectrometry enabled quantification of 1143 proteins, and 125 were differentially regulated between MeHg-treated samples and controls. Six proteins among the top differentially regulated (T23O, GLNA EPS8L2, APOA4, RAP1B, CZTZ) were analyzed using selected reaction monitoring (SRM). Supported by bioinformatics analyses, we conclude that MeHg disrupts mainly redox homeostasis and energy generating metabolic pathways in cod liver, the latter potentially modulated through MeHg-induced oxidative stress.

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Project description:The main object of this study was to evaluate the impact of different levels of vitamin A (VA) and arachidonic acid (ARA) in relation to eicosapentaenoic acid (EPA) on mineralization and gene expression in Atlantic cod larvae (Gadus morhua). A two-way factorial design was used to identify possible interactions between the nutrients. First-feeding larvae were fed enriched rotifers from start-feeding until 29 days post hatch (dph). Larvae in four tanks were fed one of the following diets: control (EPA/ARA ratio: 15.8, 0.9 µg VA g-1 wet wt.), control+VA (EPA/ARA ratio: 15.8, 7.8 µg VA g-1 wet wt.), High ARA (EPA/ARA ratio: 0.9, 1.5 µg VA g-1 wet wt.) or High ARA +VA (EPA/ARA ratio: 0.9, 12.0 µg VA g-1 wet wt.). There was no difference in survival (33-40%) between the groups. Larvae fed High ARA+VA were shorter at 29 dph. The larvae fed High ARA+VA had significantly less mineralized bones, showing significant interaction effects between VA and ARA. Although transcriptomic analysis using a custom-made microarray did not reveal any interaction effects, it was found that high ARA diets altered the transcription of more genes than control +VA diets. Furthermore, blgap1 , blgap2 and col10a1 were all down-regulated in larvae fed High ARA-diets and to a lesser extent by Control +VA diet. Lower expression in the High ARA+VA diets compared to ARA and VA diets indicated an additive effect on mineralization. In conclusion, this study showed that the dietary increase in ARA and VA altered the skeletal metabolism during larval A. cod development, most likely through signaling pathways specific for each nutrient rather than an interaction. The present study also demonstrates that VA could affect the larval response to ARA, even within the accepted non-toxic/non-deficient range.

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