GEO DataSets

(Submitter supplied) We performed combined transcriptional and chromatin state analyses and showed that these core piRNA clusters in Aedes mosquitoes do not have their own independent promoters, but depend on readthrough transcription from upstream genes for piRNA biogenesis. We further showed core piRNA clusters biogenesis depends on key factors, the mRNA exporter Nxf1, three Tudor proteins, Veneno, Tejas, Yb, and an evolutionarily conserved cochaperone Shutdown.

Organism:

Aedes aegypti

Type:

Genome binding/occupancy profiling by high throughput sequencing; Non-coding RNA profiling by high throughput sequencing

Platforms:

GPL26709 GPL22030

38 Samples

Download data: BED, BROADPEAK, NARROWPEAK

(Submitter supplied) Background: The piRNA pathway has been shown in model organisms to be involved in silencing of transposons thereby providing genome stability. In D. melanogaster the majority of piRNAs map to these sequences. The medically important mosquito species Aedes aegypti has a large genome size, a high transposon load which includes Miniature Inverted repeat Transposable Elements (MITES) and an expansion of the piRNA biogenesis genes. more...

Organism:

Drosophila melanogaster; Aedes aegypti

Type:

Non-coding RNA profiling by high throughput sequencing

Platforms:

GPL14869 GPL11203

8 Samples

Download data: BAM, TXT

(Submitter supplied) Expression of transposable elements in the germline is controlled by Piwi-interacting (pi) RNAs produced by genomic loci termed piRNA clusters and associated with Rhino, a Heterochromatin Protein 1 (HP1) homolog. Previously, we have shown that transgenes containing a fragment of the I retrotransposon form de novo piRNA clusters in the Drosophila germline providing suppression of I-element activity. We noted that identical transgenes located in different genomic sites vary considerably in piRNA production and classified them as “strong” and “weak” piRNA clusters. Here, we investigated what chromatin and transcriptional changes occur at the transgene insertion sites after their conversion into piRNA clusters. We found that the formation of a transgenic piRNA cluster is accompanied by activation of transcription from both genomic strands that likely initiates at multiple random sites. The chromatin of all transgene-associated piRNA clusters contain high levels of trimethylated lysine 9 of histone H3 (H3K9me3) and HP1a, whereas Rhino binding is considerably higher at the strong clusters. None of these chromatin marks was revealed at the “empty” sites before transgene insertion. Finally, we have shown that in the nucleus of polyploid nurse cells, the formation of a piRNA cluster at a given transgenic genomic copy works according to an “all– or– nothing” model: either there is high Rhino enrichment or there is no association with Rhino at all. As a result, genomic copies of a weak piRNA transgenic cluster show a mosaic association with Rhino foci, while the majority of strong transgene copies associate with Rhino and are hence involved in piRNA production.

Organism:

Drosophila melanogaster

Type:

Other; Non-coding RNA profiling by high throughput sequencing

Platforms:

GPL17275 GPL13304

3 Samples

Download data: BW, TXT

(Submitter supplied) In Drosophila, PIWI proteins and bound PIWI interacting RNAs (piRNAs) form the core of a small RNA mediated defense system against selfish genetic elements. Within germline cells piRNAs are processed from piRNA clusters and transposons to be loaded into Piwi/Aubergine/AGO3 and a subset of piRNAs undergoes target dependent amplification. In contrast, gonadal somatic support cells express only Piwi, lack signs of piRNA amplification and exhibit primary piRNA biogenesis from piRNA clusters. more...

Organism:

Drosophila melanogaster

Type:

Non-coding RNA profiling by high throughput sequencing

Platform:

GPL9061

5 Samples

Download data: TXT

(Submitter supplied) Piwi-interacting RNAs (piRNAs) control transposable element (TE) activity in the germline. piRNAs are produced from single-stranded precursors transcribed from distinct genomic loci, enriched by TE fragments and termed piRNA clusters. The specific chromatin organization and transcriptional regulation of Drosophila germline-specific piRNA clusters ensure transcription and processing of piRNA precursors. more...

Organism:

Drosophila melanogaster

Type:

Non-coding RNA profiling by high throughput sequencing

Platforms:

GPL13304 GPL25244

6 Samples

Download data: TXT

(Submitter supplied) Background. Telomeric small RNAs related to PIWI-interacting RNAs (piRNAs) have been described in various eukaryotes; however, their role in germline-specific telomere function remains poorly understood. Using a Drosophila model, we performed an in-depth study of the biogenesis of telomeric piRNAs and their function in telomere homeostasis in the germline. Results To fully characterize telomeric piRNA clusters, we integrated the data obtained from analysis of endogenous telomeric repeats, as well as transgenes inserted into different telomeric and subtelomeric regions. more...

Organism:

Drosophila melanogaster

Type:

Non-coding RNA profiling by high throughput sequencing

Platforms:

GPL13304 GPL17275

9 Samples

Download data: TXT

(Submitter supplied) We provide a broad overview of sequence diversity in An. gambiae mature microRNAs, including annotation of novel microRNAs identified in this study.

Organism:

Anopheles gambiae

Type:

Non-coding RNA profiling by high throughput sequencing

Platforms:

GPL17644 GPL15693

8 Samples

Download data: TXT

(Submitter supplied) We present an integrated resource of profiling and analysis of small RNAs from mosquiot cells and tissues from 4 main species to determine how the viruses and transposons compare in the production of small regulatory RNAs.

Organism:

Aedes aegypti; Anopheles gambiae; Culex quinquefasciatus; Aedes albopictus

Type:

Non-coding RNA profiling by high throughput sequencing

4 related Platforms

54 Samples

Download data: TXT

(Submitter supplied) In animal gonads, 23-30nt long PIWI interacting RNAs (piRNAs) guarantee genome integrity by guiding the sequence specific silencing of selfish genetic elements such as transposons. Two major branches of piRNA biogenesis, namely primary processing and ping-pong amplification, feed into the PIWI clade of Argonaute proteins. Despite our conceptual understanding of piRNA biogenesis, major gaps exist in the mechanistic understanding of the underlying molecular processes as well as in the knowledge of the involved players. more...

Organism:

Drosophila melanogaster

Type:

Non-coding RNA profiling by high throughput sequencing

Platform:

GPL13304

13 Samples

Download data: CSV

(Submitter supplied) Transposable elements can drive genome evolution, but their enhanced activity is detrimental to the host and therefore must be tightly regulated. The piwi-interacting small RNAs (piRNAs) pathway is critically important for transposable element regulation, by inducing transcriptional silencing or post-transcriptional decay of mRNAs. We show that piRNAs and piRNA biogenesis components regulate pre-mRNA splicing of P transposable element transcripts in vivo, leading to the production of the non-transposase-encoding mature mRNA isoform in germ cells. more...

Organism:

Drosophila melanogaster

Type:

Genome binding/occupancy profiling by high throughput sequencing; Expression profiling by high throughput sequencing

Platform:

GPL17275

20 Samples

Download data: BEDGRAPH, BIGWIG

(Submitter supplied) Female Aedes aegypti mosquitoes impose a severe global public health burden as primary vectors of multiple viral and parasitic pathogens. Under optimal environmental conditions, Aedes aegypti females have access to human hosts that provide blood proteins for egg development, conspecific males that provide sperm for fertilization, and freshwater that serves as an egg-laying substrate suitable for offspring survival. more...

Organism:

Aedes aegypti

Type:

Expression profiling by high throughput sequencing

Platform:

GPL28657

33 Samples

Download data: TXT

(Submitter supplied) Mosquito saliva facilitates blood feeding through the anti-haemostatic, anti-inflammatory and immunomodulatory properties of its proteins. However, the potential contribution of non-coding RNAs to host manipulation is still poorly understood. We analysed small RNAs from Aedes aegypti saliva and salivary glands and show here that chikungunya virus-infection triggers both the siRNA and piRNA antiviral pathways with limited effects on miRNA expression profiles. more...

Organism:

Aedes aegypti

Type:

Non-coding RNA profiling by high throughput sequencing

Platform:

GPL19664

12 Samples

Download data: XLSX

(Submitter supplied) Antisense piRNAs guide silencing of established transposons during germline development, and sense piRNAs drive ping-pong amplification of the antisense pool, but how the germline responds to genome invasion is not understood. The KoRV-A gammaretrovirus infects the soma and germline and is sweeping through wild koalas by a combination of horizontal and vertical transfer, allowing direct analysis of retroviral invasion of the germline genome. more...

Organism:

Phascolarctos cinereus; Mus musculus

Type:

Expression profiling by high throughput sequencing; Non-coding RNA profiling by high throughput sequencing; Other

4 related Platforms

31 Samples

Download data: TXT

(Submitter supplied) We have generated transgenic Ae. aegypti that express a ZIKV-specific inverted repeat RNA intended to trigger the mosquito siRNA anti-viral immune pathway. To confirm that the transgene is expressed and processed, we performed small RNA sequencing on both Higgs White Eye (HWE) & anti-NS3/4A-ZIKV transgenic Ae. aegypti 24 hours post-bloodmeal

Organism:

Aedes aegypti

Type:

Non-coding RNA profiling by high throughput sequencing

Platform:

GPL22030

2 Samples

Download data: TXT

(Submitter supplied) Piwi interacting (pi)RNAs repress diverse transposable elements in the germ cells of metazoans and are essential for fertility in both invertebrates and vertebrates. The precursors of piRNAs are transcribed from distinct genomic regions, the so-called piRNA clusters; however, how piRNA clusters are differentiated from the rest of the genome is not known. To address this question, we studied piRNA biogenesis in two Drosophila virilis strains that show differential ability to generate piRNAs from several genomic regions. more...

Organism:

Drosophila virilis

Type:

Expression profiling by high throughput sequencing; Genome binding/occupancy profiling by high throughput sequencing

Platform:

GPL13313

24 Samples

Download data: BEDGRAPH

(Submitter supplied) This SuperSeries is composed of the SubSeries listed below.

Organism:

Caenorhabditis elegans

Type:

Genome binding/occupancy profiling by high throughput sequencing

Platform:

GPL26672

42 Samples

Download data

(Submitter supplied) The piRNA pathway is a conserved germline-specific small RNA pathway that ensures genomic integrity and continued fertility. In C. elegans and other nematodes, Type-I piRNA precursor transcripts are expressed from >10,000 small, independently regulated genes clustered within two discrete domains of 1.5 and 3.5 MB on Chromosome IV. These large domains likely play a significant role in promoting germline-specific expression of piRNAs, but the underlying mechanisms are unclear. more...

Organism:

Caenorhabditis elegans

Type:

Genome binding/occupancy profiling by high throughput sequencing

Platform:

GPL26672

36 Samples

Download data: BW

(Submitter supplied) The piRNA pathway is a conserved germline-specific small RNA pathway that ensures genomic integrity and continued fertility. In C. elegans and other nematodes, Type-I piRNA precursor transcripts are expressed from >10,000 small, independently regulated genes clustered within two discrete domains of 1.5 and 3.5 MB on Chromosome IV. These large domains likely play a significant role in promoting germline-specific expression of piRNAs, but the underlying mechanisms are unclear. more...

Organism:

Caenorhabditis elegans

Type:

Genome binding/occupancy profiling by high throughput sequencing

Platform:

GPL26672

6 Samples

Download data: NARROWPEAK