Elodea nuttallii transcriptomic response to mercury, monomethyl-mercury, copper and UV-B radiation
Ontology highlight
ABSTRACT:
INSTRUMENT(S): Illumina HiSeq 2000
ORGANISM(S): Elodea nuttallii
SUBMITTER: Nicole Regier
PROVIDER: E-MTAB-2557 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
Project description:The mechanisms of heavy metal accumulation in primary producers and the damage and stress response induced by heavy metals is not well understood. We used UHTS to analyze the transcriptomic response of Elodea nuttallii to heavy metal pollution. We exposed shoots of E. nuttallii for 24 h to increasing concentrations of Hg and Cd. Using Illumina RNA-Seq, we have generated over 50 million 54 nt paired end reads and 14 million single end reads, which we used for de novo assembly of the E. nuttallii transcriptome.
2012-02-01 | E-MTAB-892 | biostudies-arrayexpress
Project description:Mercury (Hg) and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) are major environmental contaminants that commonly co-occur in the environment. Both Hg and TCDD are associated with a number of human diseases including cancers. While the individual toxicological effects of Hg and TCDD have been extensively investigated, studies on co-exposure are limited to a few genes and pathways. Therefore, a significant knowledge gap exists in the understanding of the deleterious effects of co-exposure to Hg and TCDD. Due to the prevalence of Hg and TCDD co-contamination in the environment and the major human health hazards they pose, it is important to obtain a fuller understanding of genome-wide effects of Hg and TCDD co-exposure. In this study, by performing a comprehensive transcriptomic analysis of human bronchial epithelial cells (BEAS-2B) exposed to Hg and TCDD individually and in combination, we have uncovered a subset of genes with altered expression only in the co-exposed cells. We also identified the additive as well as antagonistic effects of Hg and TCDD on gene expression. Moreover, we found that co-exposure impacted several biological and disease processes not affected by Hg or TCDD individually. Our studies show that the consequences of Hg and TCDD co-exposure on the transcriptional program and biological processes could be substantially different from single exposures, thus providing new insights into the co-exposure-specific pathogenic processes.
2017-02-27 | GSE83886 | GEO
Project description:The effects of mercury (HgCl2) on barley (Hordeum vulgare L.) growth, physiological traits and gene expression profiles were studied. The shoot to root ratio was decreased in the two levels of HgCl2 (500 and 1000 ?M) assayed, which was related primarily with decreases in shoot dry weight. Moreover stomatal conductance was limited and leaf carbon isotope discrimination decreased. Therefore water uptake limitations seem to be an important component of barley responses to HgCl2. Evidences for decreased stomatal conductance and water uptake limitations were further confirmed by the over expression of ABA related transcripts and down regulation of an aquaporin in roots. Root dry weight was only affected at 1000 ?M HgCl2 and root browning was observed, while several transcripts for lignin biosynthesis were up regulated in HgCl2. Microarray analysis further revealed that growth inhibition in HgCl2 was related to increased expression of genes participating in ethylene biosynthesis and down regulation of several genes participating in DNA synthesis, chromatin structure and cell division, cell wall degradation and modification, oxidative pentose phosphate cycle and nitrogen metabolism pathway. Genes involved in detoxification and defence mechanisms were up regulated including several cytochrome P450s, glucosyltransferases and glutathione-s-transferases and amino acid metabolism participatory genes. It is concluded that barley plants survive in the presence of HgCl2 through several mechanisms that include water uptake limitations, shoot and root growth regulation, increased expression of genes involved in the biosynthesis of several plant protection secondary metabolites and finally through detoxification. Six samples were analysed including 3 biological replicates of mercury exposed roots and 3 controls (no mercury added to the growing solution)
2009-05-13 | E-GEOD-15295 | biostudies-arrayexpress
Project description:Humans are exposed to both inorganic and organic mercury. While the toxicity of mercury is well established, much remains to be resolved about how different mercurials act at the molecular level. To address this issue, we employed a toxicogenomics approach using the nematode C. elegans. Using sub-, low- or high-toxic exposures of either HgCl2 or CH3HgCl the effects of these mercurials on steady-state mRNA levels for the entire genome were determined. A total of 473 and 2,865 genes were differentially expressed in the HgCl2 and CH3HgCl treatments, respectively. Hierarchical clustering, principal components and pattern analyses indicated that the transcriptional responses of the mercurials were unique. Mixed-stage C. elegans populations were exposed to 0, 2, 7.5 or 20 uM HgCl2 or 0, 0.75, 2, 7.5 uM CH3HgCl for 24 hours. Three independent experiments were performed for each treatment condition.
2013-09-09 | E-GEOD-28915 | biostudies-arrayexpress
Project description:Background and Methods: High mercury (Hg) levels are a significant concern in many aquatic environments, and adverse effects of Hg exposure in fish can include altered behavior, reproduction, growth, and increased stress responses. In addition, human health concerns over Hg continue to warrant new research on its mechanisms of action. The objectives of this study were to investigate the impacts of Hg on the female largemouth bass (LMB) central nervous system transcriptome by conducting a laboratory injection experiment with 2.5 µg/g body weight in addition to sampling LMB from an environment that contains high levels of Hg (St. Mary’s River, Florida, USA). These animals were compared to LMB that inhibit river systems with lower Hg (Big Wekiva, Santa Fe and St. John’s Rivers Florida, USA). A LMB 8 x 15 K microarray was used for hypothalamic (laboratory) and whole brain (field) transcriptomics analysis. Results: Mercury in the blood of LMB collected from St Mary’s River was significantly elevated 3-fold (~ 0.1 ng Hg/ml blood) compared to LMB collected from the other three sites (~ 0.03 ng Hg/ml blood). In the hypothalamus of Hg injected LMB, there were 937 genes that showed differential expression (raw p = 0.05) but there were no probes that passed an FDR for multiple hypothesis correction. In contrast, in field collected LMB there were 2909 genes that that showed differential expression (raw p = 0.05) of which 38 were significant after correction for multiple hypothesis testing (FDR = 0.05). These included Hsp90 co-chaperone Cdc37, multicopper oxidase, mismatch repair protein Msh6, and 16 kDa heat shock protein A. Functional enrichment in whole brains of LMB collected from the field sites revealed that genes involved in the biological processes of protein folding and targeting, regulation of protein metabolic process, and protein degradation (i.e. ubiquitin cycle) were over-represented. Interestingly, gene set enrichment analysis identifed expression targets that were in common between the laboratory experiment (MeHg injected) and field collected LMB and these consisted of mainly homeobox transcription factors (PROP paired-like homeobox 1, LIM homeobox 3 and paired-like homeodomain 1 and 2). Lastly, prevalent themes emerged in the SNEA expression targets that included neuropeptide receptor signaling, steroid signaling, and structural components, such as beta-actin, integrins, and stress fibres. Conclusions: This study characterizes novel cell signaling pathways that underlie Hg toxicity in the teleostean central nervous system.
2012-08-31 | GSE38458 | GEO
Project description:Background and Methods: High mercury (Hg) levels are a significant concern in many aquatic environments, and adverse effects of Hg exposure in fish can include altered behavior, reproduction, growth, and increased stress responses. In addition, human health concerns over Hg continue to warrant new research on its mechanisms of action. The objectives of this study were to investigate the impacts of Hg on the female largemouth bass (LMB) central nervous system transcriptome by conducting a laboratory injection experiment with 2.5 µg/g body weight in addition to sampling LMB from an environment that contains high levels of Hg (St. Mary’s River, Florida, USA). These animals were compared to LMB that inhibit river systems with lower Hg (Big Wekiva, Santa Fe and St. John’s Rivers Florida, USA). A LMB 8 x 15 K microarray was used for hypothalamic (laboratory) and whole brain (field) transcriptomics analysis. Results: Mercury in the blood of LMB collected from St Mary’s River was significantly elevated 3-fold (~ 0.1 ng Hg/ml blood) compared to LMB collected from the other three sites (~ 0.03 ng Hg/ml blood). In the hypothalamus of Hg injected LMB, there were 937 genes that showed differential expression (raw p = 0.05) but there were no probes that passed an FDR for multiple hypothesis correction. In contrast, in field collected LMB there were 2909 genes that that showed differential expression (raw p = 0.05) of which 38 were significant after correction for multiple hypothesis testing (FDR = 0.05). These included Hsp90 co-chaperone Cdc37, multicopper oxidase, mismatch repair protein Msh6, and 16 kDa heat shock protein A. Functional enrichment in whole brains of LMB collected from the field sites revealed that genes involved in the biological processes of protein folding and targeting, regulation of protein metabolic process, and protein degradation (i.e. ubiquitin cycle) were over-represented. Interestingly, gene set enrichment analysis identifed expression targets that were in common between the laboratory experiment (MeHg injected) and field collected LMB and these consisted of mainly homeobox transcription factors (PROP paired-like homeobox 1, LIM homeobox 3 and paired-like homeodomain 1 and 2). Lastly, prevalent themes emerged in the SNEA expression targets that included neuropeptide receptor signaling, steroid signaling, and structural components, such as beta-actin, integrins, and stress fibres. Conclusions: This study characterizes novel cell signaling pathways that underlie Hg toxicity in the teleostean central nervous system.
2012-08-31 | GSE38456 | GEO
Project description:Exposure to environmental mercury (Hg) currently may contribute to immune system dysfunction and autoimmune disease. In this study phosphoproteomic analysis was used to investigate the impact of Hg2+ on a B cell line. Treatments were with 0, 2, 5, 10, 20, 50 and 100 uM Hg2+. 1713 phosphoproteins and 1937 confidently localized phosphorylation sites were identified. 161 phosphoproteins responded to Hg2+ treatment (ANOVA, 10% FDR). Hg2+ at 50 and 100 uM stimulated Tyr phosphorylation on residues in the B-cell receptor complex as well as other systems. At 20 uM and below Hg2+ primarily caused hyperphosphorylation of pSer/Thr residues and affected cytoskeletal systems. Map Kinase 1 was exceptional as it was hyperphosphorylated at Tyr 185 following 20 uM and lower Hg2+ treatments. These results contribute novel insight into the mechanism for immune system disruption by Hg2+.
2020-06-12 | PXD005415 | Pride
Project description:Environmental contamination from heavy metals poses a global concern for the marine environment, as heavy metals are passed up the food chain and persist in the environment long after the pollution source is contained. Cnidarians, dating back to 700 million years ago, play an important role in shaping marine ecosystems, but environmental pollution profoundly affects their vitality. Among the cnidarians, the sea anemone Nematostella vectensis is an advantageous model for addressing questions in molecular ecology and toxicology as it tolerates extreme environments and its genome has been published. Here we employed a transcriptome-wide RNA-Seq approach to analyze N.vectensis molecular defense mechanisms against four heavy metals: Hg, Cu, Cd and Zn. Altogether, more than 5000 transcripts showed significant changes in gene expression, with Hg having the greatest impact on up-regulating transcripts, followed by Cu, Cd and Zn. We identified, for the first time, co-up-regulation of immediate-early transcription factors such as Egr1, AP1 and NF-κB. Time-course analysis of these genes revealed their early expression as rapidly as one hour after exposure to heavy metals, suggesting that they may complement or substitute for the roles of the metal mediating Mtf1 transcripton factor. We further characterized regulation of a large array of stress-response gene families including Hsp, ABC, CYP members and phytochelatin synthase that may regulate synthesis of the metal-binding phytochelatins instead of the methallothioneins that are absent from Cnidaria genome. This study provides mechanistic insight into heavy-metal toxicity in N.vectensis and sheds light on ancestral stress adaptations. 4 metals were tested in triplicates in comparison to control (4 replicates)
2015-12-22 | E-GEOD-58769 | biostudies-arrayexpress
Project description:Desulfobacterota in marine Hg cycle
| PRJEB65319 | ENA
Project description:Heterosis is a complex phenomenon governed by many phenotypes in combination. In comparative account of the different stages a better understanding regulating this phenomenon in terms of gene action can be ascertained. We used microarrays to ascertained the kind and extent of gene actions in the different developmental stages to reach to the conclusion of contribution of different mode of gene actions. A total of 45 arrays representing in triplicates of each five developmental stages of an Indica hybrid and its parents five vegetative developmental stages. Indica hybrid (MRP5401) has been take along with its parents (female parent PMS80 (B Line) and male parent PR319 (R line)) and five stages are selected for RNA extraction and hybridization on Affymetirx microarray comprising young leaf (Leaves of 14-days-old seedling), young root (Roots of 14-days-old seedlings), Leaves of 40-60-days-old plants, Roots of 40-60-days-old plants and Flag Leaves of 90-days-old plants. Further these stages are named accordingly as YL_B, YL_H, YL_R (Leaves of 14-days-old seedlings of B parent, hybrid and R parent), YR_B, YR_H, YR_R (Roots of 14-days-old seedlings of B parent, hybrid and R parent), ML_B, ML_H, ML_R (Leaves of 40-60-days-old plants of B parent, hybrid and R parent), BMR, HMR, RMR (Roots of 40-60-days-old plants of B parent, hybrid and R parent) and BFL, HFL, RFL (Flag leaves of 90-days-old B parent, hybrid and R parent). Development course
2014-03-30 | E-GEOD-45718 | biostudies-arrayexpress