European eel Anguilla anguilla individuals from high (Tiber river, Italy) and low pollution (Bolsena lake, Italy) environments
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ABSTRACT:
ORGANISM(S): Anguilla anguilla
PROVIDER: GSE35055 | GEO | 2013/05/22
SECONDARY ACCESSION(S): PRJNA150847
REPOSITORIES: GEO
Similar Datasets
Project description:An European eel-specific microarray platform was developed to identify genes involved in response to pollutants A comparative analysis of gene expression was conducted between European eel Anguilla anguilla individuals from high (Tiber river, Italy) and low pollution (Bolsena lake, Italy) environments. Gene expression profiling was performed using an European eel-specific oligo-DNA microarray of 14,913 probes based on single-colour detection (Cyanine-3 only). Microarrays were scanned with Agilent scanner G2565BA (barcode on the left, DNA on the back surface, scanned through the glass) at a resolution of 5 microns; all slides were scanned twice at two different sensitivity settings (XDRHi 100% and XDRLo 10%); the scanner software created a unique ID for each pair of XDR scans and saved it to both scan image files. Feature Extraction (FE) 9.5 used XDR ID to link the pairs of scans together automatically when extracting data. The signal left after all the FE processing steps have been completed is ProcessedSignal that contains the Multiplicatively Detrended, Background-Subtracted Signal.
2013-05-22 | E-GEOD-35055 | biostudies-arrayexpress
Project description:The goal of this study was to gain a better understanding of the genetic background of gonadal maturation of the European eel and to use gene expression profiles to identify predictive markers for broodstock selection that can be measured in blood samples. To find leads for maturation markers we performed a pilot deep-sequencing transcriptome analysis of ovarian tissue derived from a yellow eel, a prepubertal silver eel and a post-spawning matured eel. Among the best leads were two key players in steroidogenesis, namely pP450c17 and liver receptor homolog-1.
2015-06-30 | GSE70381 | GEO
Project description:The goal of this study was to gain a better understanding of the genetic background of gonadal maturation of the European eel and to use gene expression profiles to identify predictive markers for broodstock selection that can be measured in blood samples. To find leads for maturation markers we performed a pilot deep-sequencing transcriptome analysis of ovarian tissue derived from a yellow eel, a prepubertal silver eel and a post-spawning matured eel. Among the best leads were two key players in steroidogenesis, namely pP450c17 and liver receptor homolog-1. Pilot deep-sequencing transcriptome analysis of ovary from a yellow, a prepubertal silver and a post-spawning matured eel
2015-06-30 | E-GEOD-70381 | biostudies-arrayexpress
Project description:Gene expression analyses have been performed on liver tissue of sexually mature and immature males using microarrays. 60 eels were transferred to two independent temperature controlled recirculation water units connected to two 500 L cylindro-conical tanks (30 fish per tank) where the fish were acclimated to seawater (35 PSU salinity) over a 2 week period.Eel males in one of the seawater units were injected intramuscularly every week over a 140 day period with 2000 IU hCG/kg (human chorionic gonadotropin, Sigma–Aldrich Chemical) dissolved in 0.9% saline to induce sexual maturation. Eel males in the other recirculation unit were injected weekly over the same period with 0.9% NaCl (vehicle).At the end of the experiment, eels were anesthetized in a solution of 0.1mg/L tricaine methanesulfonate (MS-222, Sigma Aldrich) and blood samples collected into heparinized syringes. Tissues (brain, liver and gonads) were collected from sexually immature (n=12) and sexually mature males (n=12).RNeasy Mini Kit (Qiagen) was used to extract RNA from the livers. Tissue samples were pooled and, therefore, each of the biological replicates (n= 4 sexually immature, n=4 sexually mature) contains tissue from three fish. Total RNA concentration was determined using the Nanodrop ND-100 spectrophotometer (NanoDrop Technologies) and sample integrity was assessed using an Agilent 2100 Bioanalyzer (Agilent Technologies). Microarray analysis was conducted using an European eel-specific array consisting of a total of 14,913 probes based on a large collection of high-throughput transcriptomic sequences (Pujolar et al. 2012). Probe sequences and further details on the microarray platform can be found on the GEO database under accession number GPL15124. Data was normalized using a quantile normalization procedure using R (http://www.r-project.org)
2015-07-31 | GSE64067 | GEO
Project description:The swimbladder of fish is a vital organ that along with gas glands in the swimbladder wall enables key physiological functions including buoyance, diving and coping with different hydrostatic pressures. Specific intramural glands provide gas for regulating gas pressure in the swimming bladder. Transcriptomic analysis have revealed evidence at the RNA level but no specific studies at the protein level have been carried out so far. Herein, it was the aim of the study to show swimbladder proteins of the European eel by label-free LC/MS (Q-Exactive Plus) that resulted in the identification of 6,223 protein groups. Neurotransmitter receptors and -transporters were enriched in the membrane fraction and enzymes for gas production were observed. The list of identified proteins may represent a useful tool for further proteomics experiments on this organ.
2018-02-27 | PXD007850 | Pride
Project description:An European eel-specific microarray platform was developed to identify genes involved in response to pollutants. A comparative analysis of gene expression was conducted between European eel Anguilla anguilla individuals from lowly-polluted Wijmeers pond at Uitbergen (Belgium), highly-polluted Hazewinkel pond at Willebroek (Belgium), extremely-polluted Dessel-Schotel canal at the locations of Schotel (Belgium) and low polluted Bolsena lake (Italy) environments.
2013-05-22 | GSE41240 | GEO
Project description:BackgroundStreptococcal infections are one of the main causes of fish disease. During the last decade, Streptococcus iniae has become one of the most important aquatic pathogens worldwide, causing high losses in marine and freshwater finfish. Clinical signs in farmed fish include loss of appetite, lethargy and grouping at the bottom of the tank. Gross changes comprise darkening of the skin and haemorrhage at the basis of fins and opercula. To date, S. iniae has been isolated from several wild and farmed fish species but never in the European eel (Anguilla anguilla). In Europe, eel production from aquaculture is around 4500 tonnes and Italy is the third largest producer. This communication represents the first report of an outbreak of S. iniae infection in European eels.Case presentationThe outbreak occurred at an eel farm in northern Italy between May 2021 and September 2021. The outbreak caused about 2% mortality per month, resulting in the loss of about 10% of the farmed fish. The diseased eels showed apathy, lethargy, inactivity and inappetence. In July 2021, three eels were necropsied. Necropsy revealed skin and branchial hyperaemia, a few skin ulcers, and diffuse peritoneal congestion with a few haemorrhagic-like spot lesions. Swab samples for bacteriology were taken from the kidneys, liver, spleen, and brain. Additionally, four eels were opened and swap samples as above were taken. All the investigated eels were found dead. Bacteriological examination revealed growth of Streptococcus spp. from all samples. Identification of S. iniae was done by biochemical characterization, the API20STREP microsystem, 16S rDNA sequencing, and MALDI-TOF. Antimicrobial therapy (oxytetracycline and erythromycin) was ineffective.ConclusionsThis is the first report of S. iniae infection in the European eel. Although this may be an isolated outbreak, it is of concern due to the losses associated with this pathogen in fish worldwide and because the European eel is an endangered species. Due to the difficulties of controlling the disease with antimicrobials, it is advisable to plan other effective control measures, such as improving water quality and the environmental conditions, reducing fish density, improving biosecurity, and by using immunostimulants and, when possible, vaccines.
| S-EPMC9926715 | biostudies-literature
Project description:The goal of this study was to gain a better understanding of the genetic background of gonadal maturation of the European eel and to use gene expression profiles to identify predictive markers for broodstock selection that can be measured in blood samples. Three-year-old farmed silver female European eels were injected with 20 mg salmon pituitary extract (SPE) once per week and sampled after 4 weekly hormone injections. Four responders (gonadosomatic index > 1.5) and two non-responders (gonadosomatic index < 1.0) were selected for Illumina RNAseq analysis to identify early markers of responsiveness to gonadotropin treatment.
2015-06-30 | GSE70382 | GEO
Project description:Gene expression analyses have been performed on brain tissue of sexually mature and immature males using microarrays. 60 eels were transferred to two independent temperature controlled recirculation water units connected to two 500 L cylindro-conical tanks (30 fish per tank) where the fish were acclimated to seawater (35 PSU salinity) over a 2 week period.Eel males in one of the seawater units were injected intramuscularly every week over a 140 day period with 2000 IU hCG/kg (human chorionic gonadotropin, Sigma–Aldrich Chemical) dissolved in 0.9% saline to induce sexual maturation. Eel males in the other recirculation unit were injected weekly over the same period with 0.9% NaCl (vehicle).At the end of the experiment, eels were anesthetized in a solution of 0.1mg/L tricaine methanesulfonate (MS-222, Sigma Aldrich) and blood samples collected into heparinized syringes. Tissues (brain, including the olfactory bulbs, telencephalon, diencephalon and mesencephalon, and gonads) were collected from sexually immature (n=12) and sexually mature males (n=12).RNA was extracted from brain tissue of a total of 24 (12 mature and 12 immature) males. For each individual, RNA was extracted separately for olfactory bulb, telencephalon and diencephalon. Because RNA concentrations of olfactory bulb, telencephalon and diencephalon were below the amount needed for microarray analysis, a separate experiment for each part of the brain was not possible. Therefore, we combined equal concentrations of olfactory bulb, telencephalon and diencephalon as a single brain sample for each individual.Microarray analysis was conducted using an European eel-specific array consisting of a total of 14,913 probes based on a large collection of high-throughput transcriptomic sequences (Pujolar et al. 2012). Probe sequences and further details on the microarray platform can be found on the GEO database under accession number GPL15124. Data was normalized using a quantile normalization procedure using R (http://www.r-project.org)
2014-09-26 | GSE55858 | GEO
Project description:Anguillid herpesvirus 1 (AngHV) is an important viral pathogen of eel. This study was conducted to investigate the molecular mechanisms and immune response at the protein levels in the skin mucus of AngHV infected Anguilla anguilla. TMT-labelling proteomics with the liquid chromatographytandem mass spectrometry (LC-MS/MS) was used for protein quantitative identification. And the quantitative protein amount was detected by parallel reaction monitoring (PRM) analysis. A total of 3486 proteins were identified, of which 2935 were quantified. When a protein fold change greater than 1.3 or less than 0.76 was considered to indicate a differentially expressed protein (DEP), 187 up-regulated proteins and 126 down-regulated proteins were detected, and most of the DEPs were enriched in CAMs pathway, intestinal immune pathway, herpes simplex virus 1 infection pathway, phagosome pathway and p53 signaling pathway. The results of the DEPs detected by PRM were highly consistent with that of the TMT-labelled quantitative proteomic analysis results.
2023-03-10 | PXD034867 | Pride