C. Elegans expression: toxic vs. adequate vs. low selenium
Ontology highlight
ABSTRACT:
ORGANISM(S): Caenorhabditis elegans
SUBMITTER: Roger Sunde
PROVIDER: E-GEOD-54011 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Publications
Toxic-selenium and low-selenium transcriptomes in Caenorhabditis elegans: toxic selenium up-regulates oxidoreductase and down-regulates cuticle-associated genes.
Boehler Christopher J CJ Raines Anna M AM Sunde Roger A RA
PloS one 20140627 6
Selenium (Se) is an element that in trace quantities is both essential in mammals but also toxic to bacteria, yeast, plants and animals, including C. elegans. Our previous studies showed that selenite was four times as toxic as selenate to C. elegans, but that deletion of thioredoxin reductase did not modulate Se toxicity. To characterize Se regulation of the full transcriptome, we conducted a microarray study in C. elegans cultured in axenic media supplemented with 0, 0.05, 0.1, 0.2, and 0.4 mM ...[more]
Similar Datasets
Project description:Genome-wide expression analysis in C. Elegans grown in axenic media with low to toxic selenium concentrations We performed Affymetrix micorarray-based transcriptional profiling on wild-type C. Elegans Bristol N2 grown in low Se axenic media supplemented with five concentrations of selenium, from low to toxic, and harvested at the L4-larva stage.
2014-07-03 | GSE54011 | GEO
Project description:Early life respiratory viral infections and atopic characteristics are significant risk factors for the development of childhood asthma. It is hypothesized that repeated respiratory viral infections might induce structural remodeling by interfering with the normal process of lung maturation; however, the specific molecular processes that mediate these developments are not understood. To define relevant molecular pathways, we used a well-established Sendai virus infection model in weanling rats to compare transcriptome signatures between a post-infection asthma prone susceptible strain (BN) and a post-infection asthma resistant strain (F344). Specific to this weanling model and not described in adult models, Sendai virus infection in the susceptible strain resulted in morphological abnormalities in distal airways that persist into adulthood, suggesting a disruption of normal lung growth. Gene expression data from infected and control lungs across five time points indicated that specific features of the immune response following viral infection were heightened and prolonged in lungs from BN compared with F344 rats. These features included an increase in macrophage cell number and related gene expression, which then transitioned to an increase in mast cell number and related gene expression. In contrast to the heightened immune response in infected BN lungs, infected F344 lungs displayed more efficient re-epithelialization. We conclude that the structural defects that developed and persisted in infected BN but not F344 lungs were preceded by a pronounced macrophage and mast cell response to viral infection acting in parallel with an inadequate re-epithelialization. For each of the five time points, one array was run for each of the four conditions (F344 control, BN control, F344 virus, BN virus) with 15 individual smaples pooled on each array.
2013-10-01 | E-GEOD-51267 | biostudies-arrayexpress
Project description:Selenium (Se) is an essential cofactor of the antioxidant enzyme glutathione peroxidase beside other functions. The evaluation of optimal selenium supplementation in chicken feed and the subsequent effects on animal health and performance requires comprehensive knowledge of the overall metabolic effects of selenium. Therefore the gene expression was measured in the control group with a standard diet and in the group with a Se supplemented diet (0.5mg Se/kg diet) to determine significantly altered gene expression. The selenium was supplemented in the form of selenized yeast (Se-yeast), which mainly consists of organic Se in the form of L-selenomethionine and L-selenocysteine. The control group received a diet, which contained 70μg of Se / kg diet and the Se-yeast group 620μg of Se / kg diet (analyzed). The one-day old broiler chicks were separated into two groups and received the control or the Se-supplemented diet ad libitum for 35 days. After slaughter the gene expression was determined in the liver of four control and five samples from the Se-yeast group. One sample from the control group did not correspond to the quality requirements and was excluded from the analysis.
2011-11-04 | E-GEOD-25151 | biostudies-arrayexpress
Project description:FOG-1/CPEB and FOG-3/Tob are the terminal regulators of the sex determination in C. elegans germ cells. CPEB and Tob proteins are both translational regulators. To investigate how FOG-1 and FOG-3 regulate germ cell sex determination we sought to identify the target mRNAs. We used transgenic epitope tagged animals (3xMyc::FOG-1 and FOG-3::3xFLAG). To identify the mRNA targets of FOG-1/CPEB and FOG-3/Tob on a genome wide scale we used RNA immunoprecipitation followed by microarray analysis. We found 81 putative mRNA targets of FOG-1 and 722 putative targets of FOG-3. 76 target mRNAs were common to both FOG-1 and FOG-3. FOG-1 RNA-coimmunoprecipitation (RIP) samples were prepared as follows. Parallel RIPs were performed with wild type animals as the control IP. Worm extracts were made from wildtype and 3xMyc::FOG-1 late L3/early L4 animals. Myc affinity gel was used to immunoprecipitate 3xMyc::FOG-1 from the extracts. RNA was extracted from the pellets and analyzed on Affymetrix microarrays. 7 biological replicates of both 3xMyc::FOG-1 and wildtype were used. FOG-3 RNA-coimmunoprecipitation (RIP) samples were prepared as follows. Parallel RIPs were performed with wild type animals as the control IP. Worm extracts were made from wildtype and FOG-3::3xFLAG late L3/early L4 animals. Myc affinity gel was used to immunoprecipitate FOG-3::3xFLAG from the extracts. RNA was extracted from the pellets and analyzed on Affymetrix microarrays. 7 biological replicates of both FOG-3::3xFLAG and wildtype were used.
2015-12-14 | E-GEOD-73070 | biostudies-arrayexpress
Project description:Protein and mRNA levels for several selenoproteins, such as glutathione peroxidase-1 (Gpx1), are down-regulated dramatically by selenium (Se) deficiency. Selenoprotein levels in rats increase sigmoidally with increasing dietary Se and reach defined plateaus at the Se requirement, making them sensitive biomarkers for Se deficiency, but not high for Se status. Biomarkers for high Se status are needed as super-nutritional Se intakes are associated with beneficial and adverse health outcomes, but conventional biomarkers are not especially useful above the Se requirement. To characterize Se regulation of the transcriptome, we conducted 3 microarray experiments in weanling mice and rats fed Se-deficient diets supplemented with levels of Se up to 5 µg Se/g diet. Rats or mice were fed Se-deficient diets supplemented with sodium selenite up to 5 ug Se/g diet for 28 or 35 days. Affymetrix Rat 230 2.0 and Mouse 430 2.0 Genome Arrays were used to analyze gene expression in liver in all studies plus kidney in the mouse study.
2011-01-19 | E-GEOD-23895 | biostudies-arrayexpress
Project description:Selenium (Se) is an essential nutrient for beef cattle health and commercial production. The molecular mechanisms responsible for physiological responses of the animal to dietary Se supplementation, however, have not been evaluated. Furthermore, the potential effect of two chemical forms (organic vs. inorganic) of Se on gene expression by Se-sufficient cattle has not been evaluated. Microarray analysis using the GeneChip Bovine Genome Array (Affymetrix, Inc., Santa Clara, CA) was conducted to determine if dietary Se supplementation in organic vs. inorganic form (OSe vs. ISe) differentially affects the liver gene expression profile in growing beef heifers. Sodium selenite (Prince Se Concentrate; Prince Agri Products, Inc., Quincy, IL) was used as the source of ISe form. Se-enriched yeast (Sel-Plex; Alltech, Inc., Nicholasville, KY) was used as the source of OSe form. Thirty Angus heifers (BW 393 ± 9 kg) were randomly assigned to 3 dietary treatments (n = 10): Control (Ctrl) group received no dietary Se supplementation; ISe treatment group daily received dietary supplementation of Se at 3 mg/animal from ISe source; OSe treatment group daily received dietary supplementation of Se at 3 mg/animal from OSe source. Six animals were randomly selected from each of 3 treatment groups for RNA extraction and microarray analysis.
2010-04-28 | E-GEOD-19696 | biostudies-arrayexpress
Project description:Colorectal cancer often arises from adenomatous polyps. Polyps can grow and progress to cancer, but may also remain static in size, regress, or resolve. Prediciting which progress to cancer and which remain benign is difficult. We developed a long-lived murine model of colorectal cancer with tumors that can be followed by colonoscopy. Our aim was to assess whether these tumors have similar growth patterns and histologic fates to human colorectal polyps to identify features to aid in risk stratification of colonic tumors. Long-lived Apcin/+ mice were treated with 4% dextran sodium sulfate to promote colonic tumorigenesis. Tumor growth patterns were characterized by serial colonoscopy, and pathology was determined. Serial biopsies of tumors were obtained for immunohistochemistry and gene expression profiling by microarray analysis with Affymetrix Whole Genome array. Tumors (n=424) grew, remained static, regressed, or resolved over time with different relative frequencies. Newly developed tumors demonstrated dynamic growth patterns with higher rates of growth and resolution, while more established tumors tended to remain static in size. Colonic tumors were hyperplastic lesions (3%), adenomas (73%), intramucosal carcinomas (20%), or adenocarcinomas (3%). Differentially expressed genes between adenomas and intramucosal carcinomas were identified. We did not identify differentially expressed genes between early and late biopsies from the same tumor. This novel murine model of intestinal tumorigenesis develops colonic tumors that can be monitored by serial colonoscopy, mirror growth patterns seen in human colorectal polyps, and progress to colorectal cancer. Further characterization of cellular and molecular features are needed to determine which features can be used to risk-stratify polyps for progress to colorectal cancer and potentially guide prevention strategies. F1 (SWR x C57BL/6) Apcin/+ mice who had been given two treatments of 4% dextran sodium sulfate in drinking water at weaning underwent colonoscopy around 80 days of age. Those with distal colonic tumors amenable to biopsy had two biopsies taken at that time. Tumors were monitored by colonoscopy every 14 days. Every 28 days, two additional biopsies were taken of each tumor. This protocol was repeated until mice were moribund. Six tumors were removed after sacrifice. The earliest and latest biopsies of each tumor were selected for RNA extraction and Affymetrix hybridization.
2014-05-03 | E-GEOD-46626 | biostudies-arrayexpress
Project description:Prostate cancer is the most commonly diagnosed malignancy in the United States. While the majority of cases are cured with radiation or surgery, about 1/3 of patients will develop metastatic disease which there is no cure, and has a life expectancy of less than 5 years. Identification of antigens associated with this transition to metastatic disease is crucial for future therapies. One such antigen of interest is the SSX gene family, which are cancer/testis antigens that are associated with the epithelial to mesenchymal transition in other cancer types. Prior work has shown that, in prostate cancer, SSX expression was restricted to metastatic tissue and not primary tumor tissue which may indicate a role in disease progression. Some work has been done into the function of the SSX family, which revealed transcriptional regulator activity. But neither the targets of this activity or the function of SSX are known. Through a transcriptomics approach, we are seeking a better understanding of the different genes and pathways SSX regulates in the context of prostate cancer, and to determine if these pathways may contribute to disease progression. We analyzed the 22Rv1 prostate cancer cell under three different conditions with 3 technical replicates each (9 total samples) They are as follow: KD the 22Rv1 cell line tranfected with shRNA targetted against the gene SSX2, SCR the 22Rv1 cell line transfected with a scrambled control shRNA, WT the wildtype 22Rv1 cell line
2016-02-11 | E-GEOD-77811 | biostudies-arrayexpress
Project description:In many parts of the US, selenium (Se)-deficient soils dictate the necessity of supplementing this trace mineral directly to the diet of cattle, with the form of Se supplied known to affect tissue-level gene expression profiles and presumably function. Because a deficiency of Se will reduce fertility, including reduced biosynthesis of testosterone by the testis and an increased frequency of abnormalities in mature spermatozoa, we hypothesized that the form of Se supplemented to cows during gestation would affect the transcriptome of the neonatal bull calf testis. Microarray analysis using the Bovine gene 1.0 ST array (GeneChip; Affymetrix, Inc., Santa Clara, CA) was conducted to determine whether gestational form of supplemental Se affected gene expression profiles in the testis. GeneChip transcript annotations were last updated in January 2013 using the annotation update release 33 from the NetAffx annotation database. Twenty-four Angus cross cows were assigned randomly (n=8) to individual ad libitum intake of a common vitamin-mineral mix that contained 35 ppm of Se supplied as either inorganic (ISe, sodium selenite; Prince Se Concentrate, Prince Agri Products, Inc., Quincy, IL), organic (OSe, Sel-Plex; Alltech Inc., Nicholasville, KY), or a 50/50 mix of ISe/OSe (Mix) Se for 4 months prior to breeding and throughout gestation. Cows were managed under a fall-calving, forage-based, cow-calf production regimen at the University of Kentucky Princeton Research and Education Center. Testis tissue (ISe n=5; OSe n=4; Mix n=4) was collected within 2 days of birth, and RNA extracted for microarray analysis.
2014-10-16 | E-GEOD-62382 | biostudies-arrayexpress
Project description:Little is known regarding the relationship between Selenium (Se) concentrations in the liver and liver gene expression. Because most cow-calf operations in Se-poor soils provide enough Se in mineral mixes to avoid deficiency, the aim of this study was to determine the effects of 4 Se form supplementation strategies (none or inorganic, organic, or 1:1 inorganic:organic mix) on liver gene expression profiles using a Se-adequate model. Microarray analysis was conducted using the custom WT Btau 4.0 Array (version 1; GeneChip, Affymetrix, Inc., Santa Clara, CA, USA) to determine if dietary Se supplementation form differentially affects the hepatic gene expression profiles of maturing beef heifers. Sodium selenite was used as the source of inorganic Se and Se-enriched yeast was the source of organic selenium. Thirty-six Angus heifers (BW 400 ± 9.0 kg) were ranked on the Se concentration of their biopsied (day -14) liver sample and randomly assigned to one of four dietary Se treatments: Control (Ctrl) group received no exogenous dietary Se supplementation; inorganic (ISe) treatment group received daily dietary Se supplementation at 3 mg/ animal of the ISe form; organic (OSe) treatment group received daily dietary Se supplementation of 3 mg/ animal of OSe form; and the mix (1:1 ISe:OSe) received daily dietary Se supplementation of 3 mg/ animal of 50:50 mix of ISe and OSe forms. RNA was extracted from biopsied liver samples taken 168 days after initiation of Se supplementation and microarray analyses were conducted.
2013-06-01 | E-GEOD-44680 | biostudies-arrayexpress