Browse
Submit Data
Databases
API
Help

Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

17 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Characterization of expression changes in qin by tiling array

ABSTRACT: Qin, a novel protein comprising amino-terminal E3 ligase and five carboxy terminal Tudor domains, silences transposons and ensures genome stability in the Drosophila germline by promoting antisene piRNA amplification via Aubergine:Ago3 Ping-Pong and preventing futile Aubergine:Aubergine interactions. Extract total ovary RNAs, and using tiling array to test transposon as well as gene expression in wild-type and qin mutant flies. Three biological replicates are used.

ORGANISM(S): Drosophila melanogaster

SUBMITTER: Zhao Zhang

PROVIDER: E-GEOD-30061 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

ACCESS DATA

Json Xml

Similar Datasets

Adaptation to transposon invasion in Drosophila melanogaster

Project description:Transposons evolve rapidly and can mobilize and trigger genetic instability. piRNAs silence these genome pathogens, but it is unclear how the piRNA pathway adapts to new transposons. In Drosophila piRNAs, encoded by heterochromatic clusters are maternally deposited in the embryo. Paternally inherited P-element transposons thus escape silencing and trigger a genetic instability and sterility. We show that this syndrome, termed P-M hybrid dysgenesis, also disrupts the piRNA biogenesis machinery and activates resident transposons. As dysgenic hybrids age, however, fertility is restored, P-elements are silenced, and P-element piRNAs are produced de novo. In addition, the piRNA biogenesis machinery is restored and resident elements are silenced. Significantly, new resident transposons insertions accumulate in piRNA clusters, and these new insertions are transmitted to progeny with high fidelity, produce novel piRNAs, and are associated with reduced transposition. P-M hybrid dysgenesis thus leads to heritable changes in chromosome structure that appear to enhance transposon silencing. 3 replicates of each sample (Har 2-4 days, w1 x Har 2-4 days, w1 x Har 21 days), total RNA samples hybridized to tiling array.

2011-12-23 | E-GEOD-31813 | biostudies-arrayexpress

UAP56 couples piRNA clusters to the perinuclear transposon silencing machinery [tiling array]

Project description:The transposon silencing piRNAs are produced from precursors that are encoded by heterochromatic clusters and processed in the perinuclear nuage. We show that the Drosophila nuclear DEAD box protein UAP56, previously implicated in mRNA splicing and nuclear export, co-localizes with the cluster-associated HP1 homologue Rhino. Prominent nuclear foci containing Rhi and UAP56 localize directly across the nuclear envelope from Vasa, a conserved DEAD box protein and core nuage component that is required for piRNA production, and piRNA precursors immunoprecipitate with both UAP56 and Vasa. A uap56 point mutation that prevents UAP56 protein co-localization with Rhino also disrupts nuage organization, transposon silencing, and expression of dual strand piRNA clusters. By contrast, this allele significantly increases ectopic piRNAs from protein coding genes. We therefore propose that UAP56 and Vasa organize a piRNA-processing compartment that spans the nuclear envelope, increasing the efficiency and specificity of piRNA biogenesis. 3 replicates of each sample (uap56, vasa), total RNA samples hybridized to tiling array.

2012-11-28 | E-GEOD-35636 | biostudies-arrayexpress

UAP56 couples piRNA clusters to the perinuclear transposon silencing machinery

Project description:This SuperSeries is composed of the SubSeries listed below. Refer to individual Series

2012-11-28 | E-GEOD-35638 | biostudies-arrayexpress

A transcriptome-wide RNAi screen in the Drosophila ovary reveals factors of the germline piRNA pathway [RNA-Seq]

Project description:The Drosophila piRNA pathway provides an RNA-based immune system that defends the germline genome against selfish genetic elements. Two inter-related branches of the piRNA system exist: somatic cells that support oogenesis only employ Piwi, whereas germ cells utilize a more elaborated pathway centered on the three gonad-specific Argonaute proteins Piwi, Aubergine, and Argonaute3. While several key factors of each branch have been identified, our current knowledge is insufficient to explain the complex workings of the piRNA machinery. Here, we report a reverse genetic screen spanning the ovarian transcriptome in an attempt to uncover the full repertoire of genes required for piRNA-mediated transposon silencing in the female germline. Our screen reveals new key factors of piRNA-mediated transposon silencing, including the novel piRNA biogenesis factors, CG2183 (GASZ) and Deadlock. Last, our data uncovers a previously unanticipated set of factors preferentially required for repression of different transposons types. Examination of total RNA levels from nos-GAL4 or tj-GAL4 driven UAS-dsRNA knockdowns of control genes and piRNA pathway components in ovaries of Drosophila melanogaster by deep sequencing (using Illumina HiSeq2000).

2013-05-10 | E-GEOD-46100 | biostudies-arrayexpress

Characterization of expression changes in qin by tiling array

Project description:Qin, a novel protein comprising amino-terminal E3 ligase and five carboxy terminal Tudor domains, silences transposons and ensures genome stability in the Drosophila germline by promoting antisene piRNA amplification via Aubergine:Ago3 Ping-Pong and preventing futile Aubergine:Aubergine interactions.

2011-11-18 | GSE30061 | GEO

RNA clamping by Vasa assembles a piRNA Amplifier complex on transposon transcripts

Project description:Germline-specific Piwi-interacting RNAs (piRNAs) protect the genome against selfish genetic elements and are essential for fertility in animals. piRNAs targeting active transposons are amplified by a feed-forward loop known as the Ping-pong cycle, which links endonucleolytic slicing of target RNAs by Piwi proteins to biogenesis of new piRNAs. However, the biochemical framework for this pathway remains elusive. Here, we describe the identification of a transient Amplifier complex mediating the biogenesis of secondary piRNAs in insect cells. This complex is nucleated by the RNA helicase Vasa and contains the two Piwi proteins participating in the Ping-pong loop, the Tudor protein Qin/Kumo and antisense piRNA guides. These components assemble on the surface of Vasa's helicase domain, which functions as an RNA clamp to anchor Amplifier onto transposon transcripts. We show that ATP-dependent RNP remodelling by Vasa facilitates the transfer of 5'-sliced piRNA precursors between the Ping-pong partners, and failure to achieve this results in Drosophila female sterility. Immunoprecipitated small RNA were purified from untransfected or transfected Bmn4 cells for preparation of high-throughput sequencing libraries.

2014-06-04 | E-GEOD-57420 | biostudies-arrayexpress

Differentially expressed Transcribed ultraconserved regions (T-UCRs) in Crohn's disease (CD) comparing to normal controls (NC)

Project description:To date, 481 transcribed ultraconserved regions (T-UCRs) have been discovered in human genome. We aimed to investigate their characteristics in Crohnâs disease (CD) with conparison to healthy normal controls, to reveal differentially expressed T-UCRs. 3 CD patients and 3 NC volunteers were recruited in this study. With colonoscopy, colon mocosa pinch biopsy samles were got at inflammed site in CD patients and normal sites in NC volunteers respectively.

2016-07-05 | E-GEOD-83982 | biostudies-arrayexpress

Multiple roles for Piwi in silencing Drosophila transposons

Project description:Silencing of transposons in the Drosophila ovary relies on three Piwi-family proteins, Piwi, Aubergine (Aub), and Ago3, acting in concert with their small RNA guides, the piRNAs. Aub and Ago3 are found in the germ cell cytoplasm, where they function in the ping-pong cycle to consume transposon mRNAs. The nuclear Piwi protein is required for transposon silencing in both germ and somatic follicle cells, yet the precise mechanisms by which Piwi acts remain largely unclear. We investigated the role of Piwi by combining cell-type specific knockdowns with measurements of steady state transposon mRNA levels, nascent RNA synthesis, and small RNA abundance. In somatic cells, Piwi loss lead to concerted effects on nascent transcripts and transposon mRNAs, indicating that Piwi acts through transcriptional gene silencing (TGS). In germ cells, Piwi loss showed disproportionate impacts on steady state RNA levels, indicating that it also exerts an effect on post-transcriptional gene silencing (PTGS). Piwi knockdown affected levels of germ cell piRNAs presumably bound to Aub and Ago3, perhaps explaining its post-transcriptional impacts. Overall, our results indicate that Piwi plays multiple roles in the piRNA pathway, in part enforcing transposon repression through effects on transcription but also participating in germ cell piRNA biogenesis. Piwi function in transcriptional and post-transcriptional transposon silencing was probed using deep-sequencing of small RNAs, steady-state and nascent transcripts, and DNA associated with H3K9me3 chromatin mark. In all cases comparison of two samples was performed: Tj- or nos-driven knock down of piwi to respective knock down of white gene (control sample). RNA-seq dataset has two replicates.

2013-02-09 | E-GEOD-43360 | biostudies-arrayexpress

Small RNA sequencing of control and Su(var)3-7 mutant Drosophila ovary

Project description:Comparison of small RNA fractions derived from piRNA clusters and transposon sequences in control and Su(var)3-7 null mutant. Small RNA profile of 3-day old control and Su(var)3-7 mutant ovaries were generated by high-throughput sequencing on Illumina HiSeq 2000

2014-05-12 | E-GEOD-53015 | biostudies-arrayexpress

Knockdown of LIVE1 in HUVEC compared to universal negative control

Project description:To profile changes in gene expression upon dsiRNA knockdown of LIVE1 lincRNA in HUVECs HUVECs were either subject to dsiRNA targeting LIVE1 or universal negative control, four distinct biological samples were used paired in each condition, 8 samples all together

2015-06-30 | E-GEOD-53551 | biostudies-arrayexpress

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data