Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

RNA-Seq on SOLiD platform of DrosDel deficiency and w1118 flies

ABSTRACT: RNA-Seq reads of DrosDel deficiency (Df/+) and parental strain diploid flies along with spike-in controls was performed on the SOLiD platform. Samples are named in this dataset according to the following sample naming scheme: tissue_genotype shorthand_sex_biological replicate #_platform_technical replicate. We sequenced mRNA from pools of female or male DrosDel and w1118 (parental strain for the Df/+ flies). The same sample was sequenced across two flow cells on the SOLiD platform.

ORGANISM(S): Drosophila melanogaster

SUBMITTER: Brian Oliver

PROVIDER: E-GEOD-31401 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Mediation of Drosophila autosomal dosage effects and compensation by network interactions.

Malone John H JH Cho Dong-Yeon DY Mattiuzzo Nicolas R NR Artieri Carlo G CG Jiang Lichun L Dale Ryan K RK Smith Harold E HE McDaniel Jennifer J Munro Sarah S Salit Marc M Andrews Justen J Przytycka Teresa M TM Oliver Brian B

Genome biology 20120424 4

<h4>Background</h4>Gene dosage change is a mild perturbation that is a valuable tool for pathway reconstruction in Drosophila. While it is often assumed that reducing gene dose by half leads to two-fold less expression, there is partial autosomal dosage compensation in Drosophila, which may be mediated by feedback or buffering in expression networks.<h4>Results</h4>We profiled expression in engineered flies where gene dose was reduced from two to one. While expression of most one-dose genes was ...[more]

PMID: 22531030

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Project description:Vitamin D may have anti-tumorigenic actions by influencing the gene expression profile of target tissues, which possess vitamin D receptors. We used a more physiological in vitro model, represented by short-term culture of breast cancer tissue slices, to study the transcriptional effects of a near physiological concentration of calcitriol. Methods. Breast cancer fragments were sliced and maintained in culture for 24 hours in the presence or absence (control) of calcitriol 0.5nM or 100nM (called physiological or supra-physiological concentrations). Five and 16 samples were included in a test or validation group and gene expression was analyzed by microarray (using SAM paired analysis) or qPCR, respectively. Results. Nine genes were regulated by calcitriol 0.5nM including CYP24A1, DPP4, EFTUD1 (FDR£0.01), which were up-modulated. However, using a less stringent FDR value (0.25) 61 genes were differentially expressed. Among the down-regulated transcripts were members of the MHC class II complex (HLA-DPA1, HLA-DQA1, HLA-DQA2, HLA-DQB1, HLA-DRA, HLA-DRB1, HLA-DRB3) and IgG binding (FCGR2A, FCGR2B, FCGR2C). There was an enrichment of genes presenting transcription factor binding sites for vitamin D, among the up-regulated genes and for interferon regulatory factor IRF1, among the down-regulated genes. Analyzing calcitriol supra-physiological effects, a more impressive transcriptional modulation was identified and 136 and 60 genes (FDR 0.1) were more and less expressed in treated samples. Up-regulated genes were involved in vitamin metabolic process, regulation of leukocyte-mediated immunity and positive regulation of alpha-beta T cell activation. Many of the induced genes were already reported as vitamin D responsive genes, including CD14, which was also up-regulated in another set of 16 samples. Genes modulated by both calcitriol concentrations were CYP24A1, DPP4, CA2 (these three in both sets of samples), EFTUD1, TKTL1, KCNK3. Conclusion. Small increments in calcitriol concentration, within the physiological range, for a relatively short period of time may exert transcriptional effects in breast cancer samples. Further studies employing physiological concentrations of vitamin D for longer periods of time may help to elucidate the hormone effects in breast cancer treatment and prevention. Breast cancer fragments were sliced and maintained in culture for 24 hours in the presence or absence (control) of calcitriol 0.5nM or 100nM (called physiological or supra-physiological concentrations). Five samples were included and were categorized according to treatment in three groups: control (A), 1,25(OH)2D3 0.5nM (B) and 1,25(OH)2D3 100nM (C).Total RNA was isolated using RNeasy kit and than was carried out according to microarray Affymetrix protocol. Data was then assessed with GeneSpring X software for background correction, normalization and summarization of raw data (CEL files) using the Robust Multi-Array Average (RMA). Five samples were included in a test and gene expression was analyzed by microarray (using SAM paired analysis). To establish a differential gene expression profile between vitamin D treated and untreated samples, SAM two class paired, provided on MEV (MultiExperiment Viewer – Boston, MA, USA) was used. Unsupervised hierarchical clustering based on Euclidean distance and average linkage was used to verify association patterns. The reliability of the clustering was assessed by the Bootstrap technique using MEV (MultiExperiment Viewer – Boston, MA, USA). Samples (16) were included in a validation group and was analyzed by qPCR.

Dataset Information

RNA-Seq on SOLiD platform of DrosDel deficiency and w1118 flies

Publications

Mediation of Drosophila autosomal dosage effects and compensation by network interactions.

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