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Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of Strongyloides ratti life-history traits

ABSTRACT: Strongyloides ratti is a parasitic nematode of rats and a laboratory model for nematode infection more generally. Selected lines were generated over the course of 20 - 30 generations such that eggs were harvested either at the beginning or towards the end of an infection, termed 'fast' and 'slow' lines, respectively. Phenotypic differences in these lines in their fecundity and response to host immunity were observed. The gene expression response of these lines in both permissive and restrictive immune environments were assayed using cDNA microarrays. Large numbers of responding genes were found (but with modest fold changes) and clusters of co-expressed genes identified. Genes exhibiting female-biased expression responded to host immunity, consistent with increased investment into transmission in restrictive immune environments.

ORGANISM(S): Strongyloides ratti

SUBMITTER: unknown unknown

PROVIDER: E-MAXD-54 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Transcription profiling of Strongyloides ratti response to environmental factors ex vivo

Project description:Strongyloides ratti is a parasitic nematode of rats and a laboratory model for nematode infection more generally. The aim of this experiment was to determine the gene expression response of parasitic females to abiotic factors in its environment ex vivo that may be relevant to its natural environment in the gut in vivo. Thus, we used cDNA arrays to assay transcriptional responses to high and low salt, to RPMI versus PBS media and to 37C versus 40C. A moderate number of gene expression changes were observed.

2009-09-03 | E-MAXD-52 | biostudies-arrayexpress

Transcription profiling of Strongyloides ratti to host immunity

Project description:Strongyloides ratti is a parasitic nematode of rats and a laboratory model for nematode infection more generally. The response of two lines of S. ratti were compared in contrasting immunological environments: (i) day 5 post infection (p.i.) in naive rats; (ii) day 12 p.i. in naive rats; day 5 p.i. in rats previously immunised with 10 iL3s; and day 12 p.i. in rats previously immunised with 10 iL3s. The gene expression response of parasitic females were assayed using cDNA microarrays. Large numbers of responding genes were found (but with modest fold changes) and clusters of co-expressed genes identified with differences observed between worms taken from naive and previously exposed hosts and from the two time points.

2009-09-03 | E-MAXD-53 | biostudies-arrayexpress

Transcription profiling of Strongyloides ratti free-living males and females and parastic and free-living females

Project description:This experiment exploits the life-cycle of Strongyloides ratti, which is a parasitic nematode of brown rats that exhibits three adult stages within its life-cycle - parasitic females, freeliving females and free-living males. We use a cDNA microarray to examine patterns of (i) gender-biased gene expression by contrasting free-living females against free-living males, and (ii) parasitic-biased expression by contrasting parasitic females against free-living females. Of the 3688 distinct transcripts represented on our array, 20% exhibited male-biased expression 19% exhibit female-biased expression, 11% exhibit parasitic-biased expression and 8% exhibit free-living-biased expression. Among the top responding genes, an orthologue of major sperm protein is upregulated in males, distinct aspartic protease orthologues are upregulated in either parasitic or in free-living females, and orthologues of hsp-17 chaperone are upregulated in parasitic females. Upon a global analysis of gene expression, we find that female-biased expression is associated with genes involved in reproductive processes and larval development, that male-biased expression is associated with genes involved in metabolism, and that free-living biased expression is associated with genes involved in regulation of body fluids and response to external stimulus. The association of gene ontology with parasite-biased expression is less clear. Our results provide an initial gene expression analysis of gender- and parasite-biased expression in S. ratti, may be more generally applicable to other parasitic nematodes, and may help to refine the search for novel drug or vaccine targets against parasitic nematodes.

2008-01-17 | E-MAXD-37 | biostudies-arrayexpress

Transcriptomic response of red grouse to gastro-intestinal nematode parasites and testosterone

Project description:The effect of testosterone on red grouse response to the parasitic nematode Trichostrongylus tenuis.

2010-12-07 | E-MEXP-2913 | biostudies-arrayexpress

A metabolic co-regulator bioinformatics screen reveals that PGC1Î± suppresses prostate cancer metastasis

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2016-03-16 | E-GEOD-75193 | biostudies-arrayexpress

Transcription profiling of wild type and HoxA11 metenephric mesenchyme and ureteric bud from embryonic day 11.5 mice

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2007-12-07 | E-GEOD-3822 | biostudies-arrayexpress

Transcription profiling of mouse B16-F10 melanoma cells transfected with FoxD3

Project description:We wished to examine the genes regulated by FoxD3 in pigment cells to gain understanding in how FoxD3 represses melanoblast specification in the neural crest. For technical reasons, we could not use neural crest cells, so we used melanoma cells, since they are derived from neural crest cells. To this end, we transfected B16-F10 mouse melanoma cells with constructs expressing FoxD3, or FoxD3-VP16, in which the C-terminal portion of FoxD3 (which contains the transcriptional repression domain) has been replaced by the VP16 transcriptional activation domain. Experiment Overall Design: The base vector used for these studies was pMES, which expresses the gene of interest under control of the chick beta-actin promoter. EGFP is also expressed from the bicistronic mRNA through the use of an IRES. Experiment Overall Design: B16-F10 cells were transfected with either empty pMES, pFoxD3 (which contains FoxD3 inserted into pMES), or pFoxD3-VP16 (similar to pFoxD3, except that the C-terminal portion of FoxD3, which contains the transcriptional repression domain, has been replaced by the transcriptional activation domain of VP16). Experiment Overall Design: 24 hours after transfection, EGFP-positive cells were collected by FACS and those cells were subjected to microarray analysis.

2008-10-26 | E-GEOD-13129 | biostudies-arrayexpress

Circular non-coding RNA ANRIL modulates ribosomal RNA maturation and atherosclerosis in humans.

Project description:Circular RNAs (circRNAs) are broadly expressed in eukaryotic cells, but their role in human health and disease remains obscure. Here, we show that circular antisense non-coding RNA in the INK4 locus (circANRIL), which is transcribed at a locus of atherosclerotic cardiovascular disease on chromosome 9p21, confers athero-protection by controlling ribosomal RNA (rRNA) maturation and modulating pathways of atherogenesis. At the molecular level, circANRIL competes with precursor rRNA (pre-rRNA) for binding to pescadillo homolog 1 (PES1), an essential 60S-preribosomal assembly factor, thereby impairing exonuclease-mediated pre-rRNA processing and ribosome biogenesis. As a consequence, circANRIL induces nucleolar stress and p53 activation, resulting in the induction of apoptosis and inhibition of proliferation, which are key athero-protective cell functions within the arterial wall. Collectively, these findings identify circANRIL as a prototype of a circRNA regulating ribosome biogenesis and conferring athero-protection, thereby unveiling a therapeutic potential of certain circRNAs in human disease. Analysis of transcriptome-wide expression level in HEK293 cells with stable overexpression of circular ANRIL (n=3) compared to a vector control (n=3).

2016-08-22 | E-GEOD-65392 | biostudies-arrayexpress

C. elegans genomic response to Konza Prairie Soil bacterial environment

Project description:Here we have compared adult wildtype (N2) C. elegans gene expression when grown on different bacterial environments/fod sources in an effort to model naturally occuring nematode-bacteria interactions at the Konza Prairie. We hypothesize that human-induced changes to natural environments, such as the addition of nitrogen fertalizer, have effects on the bacterial community in soils and this drives downstream changes in the structure on soil bacterial-feeding nematode community structure. Here we have used transcriptional profiling to identify candidate genes involved in the interaction of nematodes and bacteria in nature.

2009-05-02 | GSE15923 | GEO

Transcriptomic profiling of urine extracellular vesicles reveals alterations of CDH3 in prostate cancer

Project description:One of the challenges of current research in prostate cancer is to improve the differential non-invasive diagnosis of prostate cancer (PCa) and benign prostate hyperplasia (BPH). Extracellular vesicles (EV) are emerging structures with promising properties for intercellular communication. In addition, the characterization of EV in biofluids is an attractive source of non-invasive diagnostic, prognostic and predictive biomarkers. Here we show that urinary EV (uEV) from prostate cancer patients exhibit genuine and differential physical and biological properties. Importantly, transcriptomics characterization of uEVs led us to define the decreased abundance of Cadherin 3, type 1 (CDH3) transcript in uEV from PCa patients. Tissue and cell line analysis strongly suggested that the status of CDH3 in uEVs is a distal reflection of changes in the expression of this cadherin in the prostate tumor. Our results reveal that uEVs could represent a non-invasive tool to inform about the molecular alterations in prostate cancer. RNA extraction was performed in 10 ultracentrifuge-isolated-uEVs samples (4 BPH, 6 Pca)

2016-01-13 | E-GEOD-75441 | biostudies-arrayexpress

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