Agricultural fungicides to gene expression in Saccharomyces cerevisiae upon exposure to toxic doses
Ontology highlight
ABSTRACT:
ORGANISM(S): Saccharomyces cerevisiae
PROVIDER: GSE9337 | GEO | 2007/11/01
SECONDARY ACCESSION(S): PRJNA103019
REPOSITORIES: GEO
Similar Datasets
Project description:Patulin, 4-hydroxy-4H-furo[3,2c]pyran-2(6H)-one, is one of the most popular and characterized mycotoxin observed in agricultural products. However the mechnisims of toxicity by this chemical is not well understood. Thus, we characterized the cytotoxicity of patulin using yeast transcriptome systems. The expression profile of mRNA after exposure yeast cells to patulin was similar to those after the treatment by antifungal agricultural chemicals such as thiuram, maneb, and zeneb. The Patulin treatment activated protein degradation especially proteasome activities, sulfur amino acid metabolisms, and oxidative stress defense system. DNA alkylation damages was also suggested and this seems to be repaired by recombinational and excision repair mechanism. We also list the indicator genes for the detection of patulin in agricultura product. Keywords: stress response
2005-07-13 | GSE2923 | GEO
Project description:The number and type of synthetic chemicals that are being produced worldwide continues to increase significantly. While these industrial chemicals provide numerous benefits, there is no doubt that some have potential to damage the environment and health. Toxicity must be evaluated and use must be carefully controlled and monitored in order to minimize potential damage. DNA microarray technology has become an important new technique in toxicology. We are using the yeast Saccharomyces cerevisiae as a model organism for toxicological study because it is a simple, fast-growing eukaryote that has been thoroughly characterized. In order to evaluate toxicity by newly synthesized or mixture chemicals, toxicity-induced gene expression alteration profiles by known chemicals should be collected. In our study, cells need to be exposed with same experimental cellular condition, semi lethal (IC50), respectively. In the case of thiuram (CAS; 137-26-8), the exposure dose was decided as 75 uM by growth curve with continuously diluted exposure. Thiuram is a pesticide (fungicides) that is suspected to be cardiovascular or blood toxicant, developmental toxicant, endocrine toxicant, gastrointestinal or liver toxicant, immunotoxicant, neurotoxicant, respiratory toxicant and skin or sense organ toxicant. Keywords: stress response
2007-11-01 | GSE9326 | GEO
Project description:The number and type of synthetic chemicals that are being produced worldwide continues to increase significantly. While these industrial chemicals provide numerous benefits, there is no doubt that some have potential to damage the environment and health. Toxicity must be evaluated and use must be carefully controlled and monitored in order to minimize potential damage. DNA microarray technology has become an important new technique in toxicology. We are using the yeast Saccharomyces cerevisiae as a model organism for toxicological study because it is a simple, fast-growing eukaryote that has been thoroughly characterized. In order to evaluate toxicity by newly synthesized or mixture chemicals, toxicity-induced gene expression alteration profiles by known chemicals should be collected. In our study, cells need to be exposed with same experimental cellular condition, semi lethal (IC50), respectively. In the case of maneb (CAS; 12427-38-2), the exposure dose was decided as 2 ppm by growth curve with continuously diluted exposure. Maneb is a pesticide (fungicides) that is recognized as a carcinogen and suspected to be developmental toxicant, endocrine toxicant, gastrointestinal or liver toxicant, immunotoxicant, neurotoxicant, reproductive toxicant and skin or sense organ toxicant. Keywords: stress response
2007-11-01 | GSE9321 | GEO
Project description:The number and type of synthetic chemicals that are being produced worldwide continues to increase significantly. While these industrial chemicals provide numerous benefits, there is no doubt that some have potential to damage the environment and health. Toxicity must be evaluated and use must be carefully controlled and monitored in order to minimize potential damage. DNA microarray technology has become an important new technique in toxicology. We are using the yeast Saccharomyces cerevisiae as a model organism for toxicological study because it is a simple, fast-growing eukaryote that has been thoroughly characterized. In order to evaluate toxicity by newly synthesized or mixture chemicals, toxicity-induced gene expression alteration profiles by known chemicals should be collected. In our study, cells need to be exposed with same experimental cellular condition, semi lethal (IC50), respectively. In the case of TPN (chlorothalonil) (CAS; 1897-45-6), the exposure dose was decided as 10 uM by growth curve with continuously diluted exposure. TPN is a pesticide (fungicides) that is recognized as a carcinogen and suspected to be immunotoxicant, neurotoxicant , respiratory toxicant and skin or sense organ toxicant. Keywords: stress response
2007-11-01 | GSE9322 | GEO
Project description:Pentachlorophenol (PCP) as a widely used pesticide is also considered to be an endocrine disruptor. Molecular effects of chemicals with endocrine disrupting potential on soil invertebrates are largely unknown. Collembola (Folsomia candida) has been used as a model organism in ecotoxicity and in this study we explored the transcriptional expression changes of Folsomia candida in response to PCP contamination. A total of 92 genes were significantly differentially expressed at all exposure time and majority of them were found to be down-regulated. In addition to the transcripts encoding cytochrome P450s and transferase enzymes, chitin-binding protein was also identified in the list of common differentially genes. Analyses of Gene Ontology (GO) annotation and enrichment revealed that cell cycle related transcripts were significantly induced by PCP, indicating it can stimulated the cell proliferation in springtail as reported in human breast cancer cells. We also observed enrichment of functional terms related to steroid receptor and particularly twenty significant differential expressed genes involved in Chitin metabolism in response to PCP exposure. Combined with the confirmation by qPCR, our results appears that the adverse effects on reproduction of springtails after exposure to PCP can be attributed to a chemical-induced delay in the molting cycle and molting associated genes may serve as possible biomarkers for toxicological effects. In general, analysis of changes in the gene expression profiles of springtails in response to PCP exposure is useful for obtaining information on endocrine disruptor exposure of soil invertebrate and may contribute to the classification and risk assessment of relative chemicals.
2016-10-30 | GSE52893 | GEO
Project description:Although there have been studies on the toxicity of the pesticide thiuram, the present study is the first one to attempt to integrate a whole genomic response using microarray technology. From the DNA microarray experiment it was found that exposure to thiuram led to alterations of gene expression in yeast cells and that many genes involved in detoxification and stress response were highly induced. The induced genes were classified according to the MIPS yeast database. The induction of genes concerned with folding and proteolysis reflects the protein denaturing and degradation effects of the thiuram treatment The induction of genes involved in redox and defense against reaction oxygen species also suggests that thiuram has other effects, such as oxidative stress. Genes classified for carbohydrate metabolism and energy were also highly induced, and these gene products may play the role of providing the energy for the detoxification mechanism. In addition, in view of the induction of some genes involved in DNA repair, thiuram potentially causes DNA damage. Therefore, as stated in previous reports, thiuram is a potential positive toxic chemical. On the other hand, YKL071W, YCR102C, YLR303W, and YLL057C were selected based on the result of a DNA microarray experiment and used for the promoter activity assay. Thiuram treatment affected the promoter of these genes, indicating that this technique could be used for the selection of biomarker candidates. Keywords: stress response
2007-11-01 | GSE9336 | GEO
Project description:Bioassay is a system for monitoring toxicity of chemicals in the environment via the biological responses of experimental organisms. These responses can be detected by analysis of genome-wide changes in mRNA expression levels using DNA microarray. We applied this system for evaluation of synergistic toxicity by cadmium and thiuram, as this combination showed mutual growth inhibition in yeast. Hierarchical cluster analysis using the mRNA expression profiles suggested the response of yeast to this combination is similar to that seen with cadmium treatment. Functional characterization of induced genes by this combination treatment also suggests the enhanced toxicity of cadmium. This toxicity was observed as the damage to mitochondrial functions which were not observed with either cadmium or thiuram treatments alone. The potential toxicity to mitochondria by this combinational treatment was confirmed as the result of mitochondrial curing. We could evaluate the synergistic toxicity by cadmium and thiuram and show the possible use of transcriptome bioassay for synergistic toxicity. Keywords: stress response
2007-09-01 | GSE8718 | GEO
Project description:Through chemical contamination of natural environments, microbial communities are exposed to many different types of chemical stressors; however, research on whole genome responses to this contaminant stress is limited. This study examined the transcriptome response of a common soil bacterium, Pseudomonas aeruginosa, to the common environmental contaminant pentachlorophenol (PCP). Cells were grown in chemostats at a low growth rate to obtain substrate-limited, steady-state, balanced-growth conditions. The PCP stress was administered as a continuous increase in concentration, and samples taken over time were examined for physiological function changes with whole cell acetate uptake rates (WAUR) and cell viability, and for gene expression changes using Affymetrix GeneChip technology and RT-PCR. Cell viability, measured by heterotrophic plate counts, showed a moderately steady decrease after exposure to the stressor, but WAURs did not change in response to PCP. In contrast to the physiological data, the microarray data showed significant changes in the expression of several genes. In particular, genes coding for multi-drug efflux pumps, including MexAB-OprM, were strongly upregulated. The upregulation of these efflux pumps protected the cells from the potentially toxic effects of PCP, allowing the physiological whole-cell function to remain constant. Experiment Overall Design: Cells of P. aeruginosa were grown in steady-state nutrient-limiting conditions using a minimal medium with acetate as the sole carbon source. PCP was added as a continuous input, and the samples were taken at timepoints corresponding to approximately 0.5, 1, and 2 generation times. Reactors were run at least in triplicate, and samples from duplicate WT reactors and a single RpoS- reactor were used for the microarrays. Gene expression is reported as the average fold-change associated with gene expression of PCP-shocked cells compared with the pre-PCP timepoint (0 hours) for the WT.
2008-06-13 | E-GEOD-5604 | biostudies-arrayexpress
Project description:Environmental factors, including pesticides, have been linked to autism and neurodegeneration risk using retrospective epidemiological studies. Here, we sought to prospectively identify chemicals that share transcriptomic signatures with neurological disorders by exposing mouse cortical neuron-enriched cultures to hundreds of chemicals commonly found in the environment and on food. We find that rotenone, a pesticide associated with Parkinsonâs disease risk, and certain fungicides, including pyraclostrobin, trifloxystrobin, famoxadone, and fenamidone, produce transcriptional changes in vitro that are similar to those seen in brain samples from humans with autism, advanced age and neurodegeneration (Alzheimerâs disease, Huntingtonâs disease). These chemicals stimulate free radical production and disrupt microtubules in neurons, effects that can be reduced by pretreating with a microtubule stabilizer, an antioxidant, or with sulforaphane. Our study provides an approach to prospectively identify environmental chemicals that transcriptionally mimic autism and other brain disorders. 405 total samples, consisting of 297 unique chemicals and vehicle controls.
2016-04-01 | E-GEOD-70249 | biostudies-arrayexpress
Project description:Parenteral nutrition (PN) is typically administered to individuals with gastrointestinal dysfunction, a contraindication for enteral feeding and a need for nutritional therapy. When PN is the only energy source in patients, it is defined as total parenteral nutrition (TPN). TPN is a life-saving approach for different patient populations, both in infants and adults. However, despite numerous benefits, TPN can cause adverse effects, including metabolic disorders and liver injury. TPN-associated liver injury, known as intestinal failure-associated liver disease (IFALD), represents a significant problem affecting up to 90% of individuals receiving TPN. IFALD pathogenesis is complex, depending on the TPN components as well as on the patient’s medical conditions. Despite numerous animal studies and clinical observations, the molecular mechanisms driving IFALD remain largely unknown. The present study was set up to elucidate the mechanisms underlying IFALD. For this purpose, human liver spheroid co-cultures were treated with TPN mixture followed by RNA sequencing analysis. It was found that prolonged exposure to TPN substantially changes the transcriptome profile of liver spheroids and affects multiple metabolic and signaling pathways contributing to liver injury.
2024-05-03 | GSE264357 | GEO