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GSE14537
Homo sapiens
18 Downloadable Samples
Affymetrix Human Genome U133 Plus 2.0 Array (hgu133plus2)
Description
Relative contribution of sequence and structural features to the mRNA-binding of Argonaute/miRNA complexes and the degradation of miRNA targets
Publication Title
Relative contribution of sequence and structure features to the mRNA binding of Argonaute/EIF2C-miRNA complexes and the degradation of miRNA targets.
Sample Metadata Fields
No sample metadata fields
View Samples- Homo sapiens
- 13 Downloadable Samples
Illumina Genome Analyzer IIx
Description
Crosslinking and immunoprecipitation (CLIP) is increasingly used to map transcriptome-wide binding sites of RNA-binding proteins (RBPs). We developed a method for CLIP data analysis and applied it to compare 254 nm CLIP with PAR-CLIP, which involves crosslinking of photoreactive nucleotides with 365 nm UV light. We found small differences in the accuracy of these methods in identifying binding sites of HuR, a protein that binds low-complexity sequences and Argonaute 2, which has a complex binding specificity. We show that crosslink-induced mutations lead to single-nucleotide resolution for both PAR-CLIP and CLIP. Our results confirm the expectation from original CLIP publications that RNA-binding proteins do not protect sufficiently their sites under the denaturing conditions used during the CLIP procedure, and we show that extensive digestion with sequence-specific ribonucleases strongly biases the set of recovered binding sites. We finally show that this bias can be substantially reduced by milder nuclease digestion conditions. Overall design: We performed duplicate experiments for each variant of the CLIP protocol (CLIP, PAR-CLIP), each protein (HuR, Ago2), and enzymatic digestion (complete T1 digestion, mild MNase digestion). In addition, we performed a single PAR-CLIP experiment with mild T1 digestion.
Publication Title
A quantitative analysis of CLIP methods for identifying binding sites of RNA-binding proteins.
Sample Metadata Fields
No sample metadata fields
View Samples- Glycine max
- 27 Downloadable Samples
- Affymetrix Soybean Genome Array (soybean)
Description
The autoregulation of mycorrhization (AOM) describes a plant regulatory mechanism that limits the number of infection events by arbuscular mycorrhizal fungi. The key signal mediator is a receptor kinase (GmNARK) that acts in the shoots. Early signals of the mycorrhizal symbiosis induce a root-derived signal that activates GmNARK in the shoot finally leading to a systemic repression of subsequent infections in the root. So far, less is known about the signals down-stream of GmNARK. To find genes regulated by GmNARK in a mycorrhiza-dependent as well as in a mycorrhiza-independent manner, we used the Affymetrix GeneChip for soybean. In general, mycorrhizal root systems consist of both colonized and non-colonized, but autoregulated roots. To physically separate those two root types for transcript analysis of specifically regulated genes, we used the split-root system. Transcript profiling during AOM was done with material of Bragg wild-type and of the nark mutant nts1007, either non-inoculated or partially inoculated with the mycorrhizal fungus Rhizophagus irregularis (formerly Glomus intraradices). Wild-type and nark mutants were inoculated with R. irregularis on one half of the root-systems (root-parts "A") only. The remaining half of the root-systems stayed non-infected (root-parts "B"). Corresponding controls stayed completely non-infected. Gene expression was analyzed in inoculated root-parts, non-inoculated root-parts and shoots of three individual plants per treatment. ****[PLEXdb(http://www.plexdb.org) has submitted this series at GEO on behalf of the original contributor, Sara Schaarschmidt. The equivalent experiment is GM53 at PLEXdb.]
Publication Title
Analyzing the soybean transcriptome during autoregulation of mycorrhization identifies the transcription factors GmNF-YA1a/b as positive regulators of arbuscular mycorrhization.
Sample Metadata Fields
Age, Specimen part
View Samples- Drosophila melanogaster
- 13 Downloadable Samples
- Affymetrix Drosophila Genome Array (drosgenome1)
Description
Ewg differentially regulated genes in 16-18 h Drosophila embryos. The experiment contains expression measurements from wild type, ewg l1 protein null allele and ewg l1 elavEWG (elavEWG rescue construct expressing a ewg cDNA from the elav promoter) mutants.
Publication Title
Erect wing regulates synaptic growth in Drosophila by integration of multiple signaling pathways.
Sample Metadata Fields
Age
View Samples- Mus musculus
- 6 Downloadable Samples
- Illumina MouseWG-6 v2.0 expression beadchip
Description
To search for rapid changes in gene expression following BCR activation, we performed DNA microarray analysis of activated splenic B cells with and without anti-IgM treatment for 3 hour. The expression of a remarkably large set of genes differed significantly.
Publication Title
Initiation of antigen receptor-dependent differentiation into plasma cells by calmodulin inhibition of E2A.
Sample Metadata Fields
Age, Specimen part
View Samples- Homo sapiens
- 16 Downloadable Samples
- IlluminaHiSeq2500
Description
RNA-Seq technique was applied to investigate the effects of four cDNA amplification kits and two RNA-Seq library preparation kits to the deep sequencing results at different perspectives. Overall design: The same set of semen samples were applied to investigate the qualitative and quantitative effect of four cDNA amplification methods and two RNA-Seq library preparation methods on sperm transcript profiling.
Publication Title
A comparison of sperm RNA-seq methods.
Sample Metadata Fields
No sample metadata fields
View Samples- Homo sapiens
- 16 Downloadable Samples
- Illumina HiSeq 2000
Description
RNA-Seq technique was applied to investigate the effects of two semen collection methods (Pelleted vs Liquefied) and two sperm purification methods (SCLB vs PS) to the integrity of isolated RNAs at different perspectives. Overall design: The same set of semen samples were applied to investigate the qualitative and quantitative effect of semen collection methods and sperm cell purification methods on sperm transcript profiling.
Publication Title
Evaluation of the effectiveness of semen storage and sperm purification methods for spermatozoa transcript profiling.
Sample Metadata Fields
Subject
View Samples- Homo sapiens
- 18 Downloadable Samples
- Affymetrix Human Genome U133 Plus 2.0 Array (hgu133plus2)
Description
Herpesviruses are known to encode micro (mi)RNAs and to use them to regulate the expression of both viral and cellular genes. The genome of Kaposis sarcoma herpesvirus (KSHV) encodes a cluster of twelve miRNAs, which are abundantly expressed during both latency and lytic infection. Relatively few cellular targets of KSHV miRNAs are known. Here, we used a microarray expression profiling approach to analyze the transcriptome of both B lymphocytes and endothelial cells stably expressing KSHV miRNAs and monitor the changes induced by the presence of these miRNAs. We generated a list of potential cellular targets by looking for miRNA seed-match-containing transcripts that were significantly down regulated upon KSHV miRNAs expression. Interestingly, the overlap of putative targets identified in B lymphocytes and endothelial cells was minimal, suggesting a tissue-specific target-regulation by viral miRNAs. Among the putative targets, we identified caspase 3, a critical factor for the control of apoptosis, which we validated using luciferase reporter assays and western blotting. In functional assays we obtained further evidence that KSHV miRNAs indeed protect cells from apoptosis.
Publication Title
Kaposi's sarcoma herpesvirus microRNAs target caspase 3 and regulate apoptosis.
Sample Metadata Fields
Cell line
View Samples- Mus musculus
- 6 Downloadable Samples
- Affymetrix Mouse Genome 430 2.0 Array (mouse4302)
Description
Transcriptional and posttranscriptional regulatory networks play a crucial role in the maintenance and adaptation of pancreatic beta-cell function. In this study we show that the levels of the prototypic neuroendocrine miRNA-7 are regulated in islets of obese, diabetic and aged mouse models. Using gain- and loss-of-function models we demonstrate that miR-7 regulates crucial members of the endocrine pancreatic transcriptional network controlling differentiation and insulin synthesis. Importantly, it also directly regulates key proteins in the insulin granule secretory machinery. These results reveal an interconnecting miR-7 genomic circuit that influences beta-cell differentiation, insulin synthesis and release and define a role for miR-7 as an endocrine checkpoint to stabilize beta-cell function during metabolic stress. These findings have implications for miR-7 inhibitors as potential therapies for type 2 diabetes and neurodegenerative diseases.
Publication Title
MicroRNA-7a regulates pancreatic β cell function.
Sample Metadata Fields
Specimen part, Cell line, Treatment
View Samples- Mus musculus
- 34 Downloadable Samples
- Affymetrix Mouse Genome 430 2.0 Array (mouse4302)
Description
Although mast cells elicit proinflammatory and type I IFN responses upon VSV infection, in response to L.monocytogenes (L.m) or S. Typhimurium (S.t), such cells elicit a transcriptional program devoid of type I IFN response.
Publication Title
Mast cells elicit proinflammatory but not type I interferon responses upon activation of TLRs by bacteria.
Sample Metadata Fields
Specimen part
View Samples