Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1084256 | ENA |
REPOSITORIES: ENA
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Project description:To determine toxicant specific effects of Ordnance Related Compound (ORC) exposure we performed microarray hybridizations with RNA isolated from Daphnia magna following different ORC exposures at the 1/10 LC50. The gene expression profiles revealed toxicant specific gene expression profiles allowed for the identification of specific biomarkers of exposure. Keywords: ecotoxicogenomic exposure study We exposed Daphnia magna the 1/10 LC50 of different Ordnance Related Compounds (Cu, Zn, Pb, WO4, RDX, TNT, 2-ADNT, 2-ADNT, TNB, DNB, 2,4-DNT, and 2,6-DNT) for 24 hours. For each exposure condition, we performed 3 exposures and 2 technical replicates (as dye swap) for each exposure (6 microarrays total, except TNT and Cu). All exposures were compared to a unexposed laboratory control (MHRW media).
2010-05-18 | E-GEOD-13169 | biostudies-arrayexpress
Project description:To determine dose-dependent effects of metal exposure we performed microarray hybridizations with RNA isolated from Daphnia magna following Cu, Cd, and Zn exposures over a range of concentrations that included a tolerated concentration, a sublethal concentration, and a highly toxic concentration. The gene expression profiles revealed effects to digestion related genes, immune related genes, metallothioneins, and oxidative stress genes at the higher concentrations. We also observed that the highest concentrations produced less specific gene expression profiles than the lower concentrations suggesting a more general stress response at the higher concentrations. The lowest concentration tested, representing tolerated concentrations of the metals, caused differential expression of only a few genes and were distinct from the expression profiles of the higher concentrations. This result provides support for the presence of a No Observed Transcriptional Effect Level (NOTEL) for metal exposure in D. magna and suggests that gene expression analysis may offer a strategy for distinguishing between toxic and nontoxic concentrations of metals in the environment. Keywords: ecotoxicogenomic exposure study
2008-06-09 | GSE7668 | GEO
Project description:Cadmium (Cd) is a toxic metal causing sublethal and chronic effects in crustaceans. Omic technologies offer unprecedented opportunities to better understand modes of toxicity by providing a holistic view of the molecular changes underlying physiological disruption. We sought to use gene expression and metabolomic analyses to reveal the processes leading to chronic Cd toxicity in the indicator species, Daphnia magna, after a 24-h sublethal exposure (18 ug/L, corresponding to 1/10 LC50). We first confirmed that metabolites can be detected and identified in small volumes (~3-6 ul) of D. magna hemolymph using Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry and NMR spectroscopy. We then compared the altered metabolite levels from a mass spectrometry metabolomics study to differentially expressed genes identified by a D. magna 44k oligonucleotide microarray. Metabolomics identified several essential amino acids, nucleotides and fatty acids as decreased in D. magna hemolymph following Cd exposure. Transcriptional changes included decreased levels of digestive enzymes and increased expression of genes related to embryonic development. The integration of metabolomic and transcriptomic profiles, as well as incorporation of results from previous studies, has enabled construction of a conceptual model detailing how sublethal Cd disrupts energy reserves and reproduction resulting in chronic toxicity. Daphnia magna were exposed to 18 micrograms/L Cadmium sulfate for 24 hours. RNA was extracted and hybridized to a custom Daphnia magna microarray to determine genes differentially expressed by the treatment. Two treament experiment:Unexposed and Cd treatment, 6 replicates for each condition
2010-12-31 | E-GEOD-20218 | biostudies-arrayexpress
Project description:The aim of this study was to measure chronic sublethal effects of the flame retardant Tris(2-butoxyethyl)phosphate (TBEP) on gene expression, associated protein activity and life-history endpoints (reproduction, development) in the freshwater crustacean Daphnia magna. We exposed <24h old D. magna neonates for 21 days to culture medium (control) and to 3 sublethal doses of TBEP: 14.7, 147 and 1470 M-BM-5g/L. Exposure doses were chosen from 48h acute toxicity testing and represent 1/10000, 1/1000 and 1/100 of the LC50, respectively. Each condition (control and the 3 different doses) were performed on 3 independant biological replicates, with 10 individuals each. We used a custom 15000 sequences D. magna microarray to measure transcriptional effect of each of the TBEP doses in comparison to unexposed controls. We exposed <24h old Daphnia magna to culture medium (unexposed controls) and 3 sublethal doses of TBEP (14.7M-BM-5g/L, 147M-BM-5g/L and 1470M-BM-5g/L) for 21 days. We used 3 biological replicates of 10 individuals for each condition.
2014-02-19 | E-GEOD-55132 | biostudies-arrayexpress
Project description:Sublethal effects of perfluoroethylcyclohexanesulfonate (PFECHS) on the gene expression and protein activity of Daphnia magna Reference sample is a composite of equal amounts of total RNA (500 ng each) from n=3 culture media control
2015-12-03 | GSE75607 | GEO
Project description:Sublethal effects of the flame retardant intermediate hexachlorocyclopentadiene (HCCPD) on the gene expression and protein activity of Daphnia magna Reference sample is a composite of equal amounts of total RNA (500 ng each) from n=3 culture media controls and n=3 methanol controls
2013-09-01 | GSE45998 | GEO
Project description:Sublethal effects of the flame retardant intermediate hexachlorocyclopentadiene (HCCPD) on the gene expression and protein activity of Daphnia magna Reference sample is a composite of equal amounts of total RNA (500 ng each) from n=3 culture media controls and n=3 methanol controls Two-condition experiment: controls (methanol and cell culture) and three sublethal doses of HCCPD (0.138 ug/L, 1.38 ug/L, 13.8 ug/L). Biological replicates: 3 replicates each group.
2013-09-01 | E-GEOD-45998 | biostudies-arrayexpress
Project description:Cadmium (Cd) is a toxic metal causing sublethal and chronic effects in crustaceans. Omic technologies offer unprecedented opportunities to better understand modes of toxicity by providing a holistic view of the molecular changes underlying physiological disruption. We sought to use gene expression and metabolomic analyses to reveal the processes leading to chronic Cd toxicity in the indicator species, Daphnia magna, after a 24-h sublethal exposure (18 ug/L, corresponding to 1/10 LC50). We first confirmed that metabolites can be detected and identified in small volumes (~3-6 ul) of D. magna hemolymph using Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry and NMR spectroscopy. We then compared the altered metabolite levels from a mass spectrometry metabolomics study to differentially expressed genes identified by a D. magna 44k oligonucleotide microarray. Metabolomics identified several essential amino acids, nucleotides and fatty acids as decreased in D. magna hemolymph following Cd exposure. Transcriptional changes included decreased levels of digestive enzymes and increased expression of genes related to embryonic development. The integration of metabolomic and transcriptomic profiles, as well as incorporation of results from previous studies, has enabled construction of a conceptual model detailing how sublethal Cd disrupts energy reserves and reproduction resulting in chronic toxicity.
2010-12-31 | GSE20218 | GEO
Project description:The aim of this study was to assess the transcriptomic responses in guts dissected from Daphnia magna individuals exposed to concentrations of selected compounds that peroduced low and high inhibitory effects on feeding. Chemical treatments included Cd, Cu, fluoranthene, l-cyalothrine and the cyanotoxin anatoxin a. Two additional treatments including low and no food (starving) were also included to better account for transcriptomic responses related to food limitation. We tested the hypothesis that the studied chemicals should share similar molecular signalling pathways across low and high levels of feeding impairment.
2022-01-02 | GSE165726 | GEO
Project description:This SuperSeries is composed of the following subset Series: GSE29854: Daphnia magna exposed to narcotics and polar narcotics - aniline GSE29856: Daphnia magna exposed to narcotics and polar narcotics - 4-chloroaniline GSE29857: Daphnia magna exposed to narcotics and polar narcotics - 3,5-dichloroaniline GSE29858: Daphnia magna exposed to narcotics and polar narcotics - 2,3,4-trichloroaniline GSE29862: Daphnia magna exposed to narcotics and polar narcotics - ethanol GSE29864: Daphnia magna exposed to narcotics and polar narcotics - isopropanol GSE29867: Daphnia magna exposed to narcotics and polar narcotics - methanol Refer to individual Series
2012-02-01 | E-GEOD-29993 | biostudies-arrayexpress