Genome-wide analysis of dFOXO binding sites in Drosophila
Ontology highlight
ABSTRACT:
ORGANISM(S): Drosophila melanogaster
SUBMITTER: Hua Bai
PROVIDER: E-GEOD-44686 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
Project description:To understand how reduced insulin/IGF-1 signaling extends Drosophila lifespan through its downstream transcription factor dFOXO. We conducted ChIP analysis with a dFOXO antibody followed by Illumina high-throughput sequencing from chico heterozygous mutants, which are long-lived and normal sized, and from adult flies with ablated insulin producing cells (IPCs), which are also long-lived. dFOXO bound at promoters of 273 genes common among these genotypes, thus potentially enriching for shared factors in control of aging.
2013-09-20 | GSE44686 | GEO
Project description:Transgenerational epigenetic inheritance is a subject of immense current interest. In a newly developed Drosophila model in the laboratory, genetic ablation of insulin-producing cells (IPCs) was found to affect whole -body triglyceride levels not only in the ablated flies but also in their male-line derived, non-ablated future generations. To further characterize this genetic-factor-induced transgenerational inheritance model, we have now performed whole body microarray gene expression profiling of adult males and females with genetically ablated IPCs, and of three consecutive, paternally derived non-ablated generations of adult males and females originating from ablated males. Interestingly, like altered levels of triglycerides, transcriptomic alterations are found not only in the ablated flies but also in their male-line-derived, non-ablated future generations.
2023-04-21 | GSE184339 | GEO
Project description:In fasted mammals, glucose homeostasis is maintained through activation of the cAMP responsive CREB coactivator TORC2, which stimulates the gluconeogenic program in concert with the forkhead transcription factor FOXO1. Here we show that starvation also triggers TORC activation in Drosophila, where it maintains energy balance by promoting the expression of CREB target genes in the brain. TORC mutant flies have reduced glycogen and lipid stores, and they are sensitive to starvation as well as oxidative stress. Neuronal TORC expression rescued starvation and oxidative stress sensitivity as well as CREB target gene expression in TORC mutants. During refeeding, increases in insulin signaling inhibited TORC activity in wild type flies by stimulating the Salt Inducible Kinase 2 (SIK2)-mediated phosphorylation and subsequent degradation of TORC. Depletion of neuronal SIK2 increased TORC activity and enhanced resistance to starvation and oxidative stress in adult flies. As disruption of insulin signaling, either by ablation of insulin-producing cells (IPCs) or by mutation of the insulin receptor adaptor gene chico, also increased TORC activity, our results illustrate the importance of an insulin-regulated pathway in brain that promotes energy balance in Drosophila. Experiment Overall Design: Male fly heads were collected after 24h fasting, and RNA was extracted using RNAeasy kit.
2008-10-20 | E-GEOD-10546 | biostudies-arrayexpress
Project description:dFOXO targets in adult Drosophila melanogaster females, and the effect of insulin signalling and stress on binding. The experimets determined the binding locations of dFOXO in the whole adult female fly using ChIP-chip. The protocol was validated using mock conditions: pre-immune serum or IP on chromatin from foxo null flies. The response of this binding to stress induced by treatment of flies with paraquat or by their exposure to starvation, as well as the response to an insulin-signalling-reducing genetic manipulation (over-expression of dominant negative form of the insulin receptor), was determined.
2011-06-18 | E-TABM-751 | biostudies-arrayexpress
Project description:Comparison of wild type and heterozygote and homozygote chico mutants ( Clancy, et al. Extension of Life-Span by Loss of CHICO, a Drosophila Insulin Receptor Substrate Protein. Science 292 (5514), 104.) on Affymetrix Drosophila2 GeneChip. The flies (Drosophila melanogaster) are 7 day old adult females.
2007-06-06 | E-MEXP-1099 | biostudies-arrayexpress
Project description:Transcriptional analysis of dInR and dfoxo epistasis in Drosophila melanogaster. The experiment was performed to examine which parts of the transcriptional response to a reduction in insulin signalling in an adult female fly depend on the presence of the dfoxo transcription factor. Whole fly transcriptome was determined with flies over-expressing a dominant negative form of the insulin receptor, or the wild-type fly, in presence or absence of dfoxo.
2011-06-18 | E-TABM-757 | biostudies-arrayexpress
Project description:In fasted mammals, glucose homeostasis is maintained through activation of the cAMP responsive CREB coactivator TORC2, which stimulates the gluconeogenic program in concert with the forkhead transcription factor FOXO1. Here we show that starvation also triggers TORC activation in Drosophila, where it maintains energy balance by promoting the expression of CREB target genes in the brain. TORC mutant flies have reduced glycogen and lipid stores, and they are sensitive to starvation as well as oxidative stress. Neuronal TORC expression rescued starvation and oxidative stress sensitivity as well as CREB target gene expression in TORC mutants. During refeeding, increases in insulin signaling inhibited TORC activity in wild type flies by stimulating the Salt Inducible Kinase 2 (SIK2)-mediated phosphorylation and subsequent degradation of TORC. Depletion of neuronal SIK2 increased TORC activity and enhanced resistance to starvation and oxidative stress in adult flies. As disruption of insulin signaling, either by ablation of insulin-producing cells (IPCs) or by mutation of the insulin receptor adaptor gene chico, also increased TORC activity, our results illustrate the importance of an insulin-regulated pathway in brain that promotes energy balance in Drosophila. Keywords: Fasting-induced gene expression
2008-07-04 | GSE10546 | GEO
Project description:Background Insulin signaling pathway is conserved from worms to humans. In Drosophila, three insulin-like peptides (dilps) are expressed in the insulin producing cells (IPCs) in the brain. In order to identify target genes of insulin signaling, the IPCs of female flies were destroyed during development by expressing apoptosis inducing factors reaper and head involution defective under control of the promoter region of dilp3. These insulin-deficient flies were analysed using high density microarrays. Results From the genes that appeared to be regulated in the absence of IPCs, the strongest difference was found for a gene involved in carbohydrate metabolism. Sequence analysis revealed that it is an alpha-glucosidase, which is able to break down disaccharides and/or glycogen. Conclusions We could identify an alpha-glucosidase, involved in carbohydrate metabolism, to be strongly affected in the context of decreased insulin signaling. The striking feature of this regulation was not only that it was the highest regulated, but it was the only gene regulated to this degree. Nutrient Conditions and Fly handling Experimental and control female flies were collected after hatching, then kept on fly maintenance food and separated from males after 11 days. After one day of recovery from carbon dioxide treatment, females were put in cages with PBS agar plates and supplied with yeast paste as only food source for 48 hours. Flies were shock frozen in liquid nitrogen and stored at - 80°C for further handling. Keywords: IPC knockout, 14 day old female flies, 48h yeast feeding Insulin producing cell deficient flies were compared to control flies. Two independent biological repeats were performed. From the two repeats, 5 chips were hybridised, including dye swap Experimental and control female flies were collected after hatching, then kept on fly maintenance food and separated from males after 11 days. After one day of recovery from carbon dioxide treatment, females were put in cages with PBS agar plates and supplied with yeast paste as only food source for 48 hours. The microarray was scanned 3 times: low scan (suffix _L in data table) with a low amplification / intensity to avoid saturated spots for proper data analysis, high scan (suffix _H in data table) with a high amplification / intensity to detect also weak fluorescent spots which are missed in the low scan and medium scan which lies between high and low intensity and gives additional data points for subsequent calculations. Both copies and all hybridisation repeats were used for normalisation, VALUE therefore has the same value for these copies in all relevant hybridisations. For additional information see publication and web link. Keywords = insulin, aging, longevity, nutrient dependance Lot batch = FP7
2010-06-25 | E-GEOD-10625 | biostudies-arrayexpress
Project description:A Drosophila microRNA (dme-miR-14) is involved in regulating the levels of insulin-like peptides (ilps) from the neuronal insulin-producing cells (IPCs). This is crucial for regulation of fat content in adult flies. Finding the target of this microRNA is crucial for understanding the regulation of ilp gene expression. We used microarrays to identify genes that are upregulated specifically in the neuronal IPCs in the microRNA mutants.
2011-02-01 | GSE20202 | GEO
Project description:A Drosophila microRNA (dme-miR-14) is involved in regulating the levels of insulin-like peptides (ilps) from the neuronal insulin-producing cells (IPCs). This is crucial for regulation of fat content in adult flies. Finding the target of this microRNA is crucial for understanding the regulation of ilp gene expression. We used microarrays to identify genes that are upregulated specifically in the neuronal IPCs in the microRNA mutants. Drosophila adult head RNA was extracted and hybridized on Affymetrix microarrays. We reared animals from early larval stages in controlled growth and feeding conditions. RNA was extracted from 5-day-old adult males. We collected RNA from control, homozygous dme-miR-14 mutants and mutants expressing dme-miR-14 microRNA specifically in the IPCs (rescue). We were interested in genes that were upregulated in the mutants and were restored or reduced to control levels in the rescue condition. Two biological replicates per sample type were performed.
2011-02-01 | E-GEOD-20202 | biostudies-arrayexpress