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GSE78227
Drosophila melanogaster
5 Downloadable Samples
Affymetrix Drosophila Genome Array (drosgenome1)
Description
During sexual dimorphism, the loss of one entire X chromosome in Drosophila males is achieved largely via a broad genome-wide aneuploid effect. Exploring how MSL proteins and two large non coding RNAs (roX1 and roX2) modulate trans-acting aneuploid effect for equality to females, we employ a system biology approach (microarray) to investigate the global aneuploid effect of maleless(mle) mutation by disrupting MSL binding. A large number of the genes (144) that encode a broad spectrum of cellular transport proteins and transcription factors are located in the autosomes of Drosophila melanogaster.
Publication Title
Drosophila maleless gene counteracts X global aneuploid effects in males.
Sample Metadata Fields
No sample metadata fields
View Samples- Rattus norvegicus
- 30 Downloadable Samples
- Affymetrix Rat Genome 230 2.0 Array (rat2302)
Description
Transcriptomics analyses in these Zn-deficient rats revealed the molecular basis of ESCC abrogation by miR-31 knockout: Egln3, a negative regulator of NF-FB, was shown to be a direct miR-31 target; miR-31 inhibition/deletion resulted in suppression of miR-31-associated-EGLN3-NF-KB controlled inflammatory pathways.
Publication Title
Abrogation of esophageal carcinoma development in miR-31 knockout rats.
Sample Metadata Fields
Treatment
View Samples- Saccharomyces cerevisiae
- 72 Downloadable Samples
- Affymetrix Yeast Genome S98 Array (ygs98)
Description
Two nutrient sensing and regulatory pathways, the general amino acid control (GAAC) and the target of rapamycin (TOR), control yeast growth and metabolism in response to changes in nutrient availability. Starvation for amino acids activates the GAAC pathway, involving Gcn2p phosphorylation of eIF2 and preferential translation of GCN4, a transcription activator of genes involved in amino acid metabolism. TOR senses nitrogen availability and regulates gene expression through transcription factors, such as Gln3p. We used microarray analyses to address the integration of the GAAC and TOR pathways in directing the yeast transcriptome in response to amino acid starvation and rapamycin treatment. Of the ~2500 genes whose expression was changed by 2-fold or greater, Gcn4p and Gln3p were required for 542 and 657 genes, respectively. While Gcn4p activates a common core of 57 genes in response to amino acid starvation or rapamycin treatment, the different stress arrangements allow for variations in Gcn4p-directed transcription. With few exceptions, genes requiring Gcn2p eIF2 kinase for induced expression also required Gcn4p, emphasizing the role of Gcn2p as an upstream activator of Gcn4p-directed transcription. There is also significant coordination between the GAAC and TOR pathways, with Gcn4p being required for activation of more genes during rapamycin treatment than Gln3p. Importantly, TOR regulates the GAAC-directed transcription of genes required for assimilation of nitrogen sources, such as -amino-butyric acid. Therefore, yeast has integrated gene expression responses to amino acid abundance and nitrogen source quality through the control of Gcn2p phosphorylation of eIF2 and GCN4 translation.
Publication Title
Integration of general amino acid control and target of rapamycin (TOR) regulatory pathways in nitrogen assimilation in yeast.
Sample Metadata Fields
Treatment
View Samples- Mus musculus
- 21 Downloadable Samples
- Affymetrix Mouse Genome 430 2.0 Array (mouse4302)
Description
Disruption of protein folding in the endoplasmic reticulum triggers the Unfolded Protein Response (UPR), a transcriptional and translational control network designed to restore protein homeostasis. Central to the UPR is PERK phosphorylation of the alpha subunit of eIF2 (eIF2~P), which represses global translation coincident with preferential translation of mRNAs, such as ATF4 and CHOP, that serve to implement the UPR transcriptional regulation. In this study, we used sucrose gradient ultracentrifugation and a genome-wide microarray approach to measure changes in mRNA translation during ER stress. Our analysis suggests that translational efficiencies vary across a broad range during ER stress, with the majority of transcripts being either repressed or resistant to eIF2~P, while a notable cohort of key regulators are subject to preferential translation. From this latter group, we identify IBTKa as being subject to both translation and transcriptional induction during eIF2~P in both cell lines and a mouse model of ER stress. Translational regulation of IBTKalpha mRNA involves the stress-induced relief of two inhibitory uORFs in the 5'-leader of the transcript. Depletion of IBTKalpha by shRNA reduced viability of cultured cells coincident with increased caspase 3/7 cleavage, suggesting that IBTKalpha is a key regulator in determining cell fate during the UPR.
Publication Title
Selective mRNA translation during eIF2 phosphorylation induces expression of IBTKα.
Sample Metadata Fields
Specimen part
View Samples- Homo sapiens
- 6 Downloadable Samples
Illumina Genome Analyzer II
Description
During normal or pathological epithelial-to-mesenchymal transition, epithelium-specific gene expression is shut down, with the DNA-binding factor ZEB1 acting as a master suppressor of epithelial identity. Here, we show that ZEB1 occupies primate-specific tandem repeats (TRs) harboring dozens of copies of its DNA-binding motif and located within genomic loci relevant for epithelial identity. Deletion of one such repeat in a quasi-mesenchymal human cancer cell line induced the reacquisition of epithelial features and phenocopied the effects of ZEB1 gene deletion. Since ZEB1 binds clustered motifs in a non-cooperative manner, changes in its nuclear concentration enable graded adjustments of TR occupancy, thus fine-tuning repression level. In addition, high motif density in TRs allows ZEB1 binding (and shutdown of epithelial programs) despite differences in chromatin organization and accessibility among epithelial cell types. Overall design: Total RNA from human pancreatic ductal adenocarcinoma cell lines was processed for multiparallel sequencing. Experiments were carried out in genome edited clonal MiaPaCa2 cells (3 ZEB1-deleted CRISPR-Cas9 clones and 3 wt clones).
Publication Title
Co-optation of Tandem DNA Repeats for the Maintenance of Mesenchymal Identity.
Sample Metadata Fields
Cell line, Subject
View Samples- Homo sapiens
- 18 Downloadable Samples
- Affymetrix Human Transcriptome Array 2.0 (hta20)
Description
Neutrophils are short-lived innate immune cells. Upon encountering appropriate stimuli, neutrophils generate and release neutrophil extracellular traps (NETs), primarily via NADPH oxidase (Nox)-dependent (~2 hours) or Nox-independent NETosis (~15-60 minutes). Ironically, DNA transcription in dying neutrophils remains an enigma. We hypothesized that transcriptional activation, regulated by NETosis-specific kinases, is important to drive the chromatin decondensation necessary for NETosis. For the first time, we show here that (i) the degree of NETosis corresponds to the degree of genome-wide transcription; (ii) kinase-specific transcriptional activation reflects transcriptional firing during different types of NETosis; and (iii) Transcriptomics suggests that NETosis could differentially regulate inflammation. Therefore, we propose that the initial steps of transcriptional firing, but neither transcription per se help to drive NETosis.
Publication Title
Transcriptional firing helps to drive NETosis.
Sample Metadata Fields
Sex, Specimen part, Disease
View Samples- Mus musculus, Homo sapiens
- 16 Downloadable Samples
- Illumina HumanHT-12 V4.0 expression beadchip, Illumina MouseRef-8 v2.0 expression beadchip
Description
This SuperSeries is composed of the SubSeries listed below.
Publication Title
Liver X receptors inhibit proliferation of human colorectal cancer cells and growth of intestinal tumors in mice.
Sample Metadata Fields
Age, Specimen part
View Samples- Mus musculus
- 8 Downloadable Samples
Illumina MouseRef-8 v2.0 expression beadchip
Description
Changes in gene expression profile of intestinal (ILEUM) Tumors from APCmin/+/VP16LXRa vs APCmin/+/VP16. The hypothesis tested in the present study was that LXRa overexpression influence cancer growth modulating lipid metabolism in cancer cells. Results provide the information that LXRa induces genes encoding proteins able to regulate cholesterol efflux.
Publication Title
Liver X receptors inhibit proliferation of human colorectal cancer cells and growth of intestinal tumors in mice.
Sample Metadata Fields
Age, Specimen part
View Samples- Mus musculus
- 12 Downloadable Samples
- Affymetrix Mouse Genome 430 2.0 Array (mouse4302)
Description
We found that the non-essential amino acid L-Proline (L-Pro) acts as a signaling molecule that promotes the conversion of embryonic stem cells (ESCs) into mesenchymal-like, spindle-shaped, highly motile, invasive pluripotent stem cells. This embryonic stem cell-to-mesenchymal-like transition (esMT) is accompanied by a genome-wide remodeling of the transcriptome
Publication Title
L-Proline induces a mesenchymal-like invasive program in embryonic stem cells by remodeling H3K9 and H3K36 methylation.
Sample Metadata Fields
Cell line
View Samples- Drosophila melanogaster
- 26 Downloadable Samples
- Illumina Genome Analyzer IIx
Description
We compared gene expression in the Drosophila fat body on control and high-sugar diets in order to gain insight into the role of this organ during caloric overload. Differential expression analysis revealed changes in gene expression suggestive of a role for CoA metabolism in the ability to tolerate high-sugar feeding. This led us to perform biochemical and mutant studies supporting a model where CoA is limiting in the face of caloric overload. Overall design: Wild-type Drosophila were reared on control (0.15M sucrose) and high-sugar (0.7M sucrose) diets until the wandering stage. Fat bodies were isolated and RNA extracted to determine the effects of diet on gene expression using Illumina RNA-seq.
Publication Title
CoA protects against the deleterious effects of caloric overload in Drosophila.
Sample Metadata Fields
Sex, Specimen part, Subject
View Samples