Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1013381 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR25922462.fastq.gz | Fastqsanger.gz | |||
| SRR25922463.fastq.gz | Fastqsanger.gz | |||
| SRR25922464.fastq.gz | Fastqsanger.gz | |||
| SRR25922465.fastq.gz | Fastqsanger.gz | |||
| SRR25922466.fastq.gz | Fastqsanger.gz |
Items per page: 5 1 - 5 of 14 |
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Project description:The PIWI-interacting RNA (piRNA) pathway plays a crucial role in preventing endogenous genomic parasites, transposable elements (TEs), from damaging the genetic material of animal gonadal cells. Specific regions in the genome, called piRNA clusters, define each species’ piRNA repertoire and therefore its capacity to recognize and silence transposons. In the somatic cells of the Drosophila melanogaster ovary, the flamenco (flam) unistrand cluster is the main source of piRNAs and primarily regulates Gypsy family TEs that are able to form virus-like particles and infect neighbouring germ cells. Disruption of the flam locus or failure to process flam precursor transcripts into piRNAs results in sterility, yet it remains unknown whether this silencing mechanism is employed widely across Drosophilidae. Here, using both synteny-based analyses and de novo TE annotation, we identify candidate loci sharing both their organisation and TE targeting repertoire with flam in widely divergent Drosophila species groups. Small RNA-sequencing validated these loci as bona-fide unistrand piRNA clusters and revealed their predominant expression in somatic cells of the ovary, likely to counter TE mobilisation in this tissue. This study provides compelling evidence of co-evolution between virus-like Gypsy family transposons and a host defence mechanism in form of soma-expressed, unistrand piRNA clusters.
2023-09-26 | GSE225888 | GEO
Project description:The PIWI-interacting RNA (piRNA) pathway plays a crucial role in preventing endogenous genomic parasites, transposable elements (TEs), from damaging the genetic material of animal gonadal cells. Specific regions in the genome, called piRNA clusters, define each species’ piRNA repertoire and therefore its capacity to recognize and silence transposons. In the somatic cells of the Drosophila melanogaster ovary, the flamenco (flam) unistrand cluster is the main source of piRNAs and primarily regulates Gypsy family TEs that are able to form virus-like particles and infect neighbouring germ cells. Disruption of the flam locus or failure to process flam precursor transcripts into piRNAs results in sterility, yet it remains unknown whether this silencing mechanism is employed widely across Drosophilidae. Here, using both synteny-based analyses and de novo TE annotation, we identify candidate loci sharing both their organisation and TE targeting repertoire with flam in widely divergent Drosophila species groups. Small RNA-sequencing validated these loci as bona-fide unistrand piRNA clusters and revealed their predominant expression in somatic cells of the ovary, likely to counter TE mobilisation in this tissue. This study provides compelling evidence of co-evolution between virus-like Gypsy family transposons and a host defence mechanism in form of soma-expressed, unistrand piRNA clusters.
2023-09-26 | GSE240910 | GEO
Project description:The PIWI-interacting RNA (piRNA) pathway plays a crucial role in preventing endogenous genomic parasites, transposable elements (TEs), from damaging the genetic material of animal gonadal cells. Specific regions in the genome, called piRNA clusters, define each species’ piRNA repertoire and therefore its capacity to recognize and silence transposons. In the somatic cells of the Drosophila melanogaster ovary, the flamenco (flam) unistrand cluster is the main source of piRNAs and primarily regulates Gypsy family TEs that are able to form virus-like particles and infect neighbouring germ cells. Disruption of the flam locus or failure to process flam precursor transcripts into piRNAs results in sterility, yet it remains unknown whether this silencing mechanism is employed widely across Drosophilidae. Here, using both synteny-based analyses and de novo TE annotation, we identify candidate loci sharing both their organisation and TE targeting repertoire with flam in widely divergent Drosophila species groups. Small RNA-sequencing validated these loci as bona-fide unistrand piRNA clusters and revealed their predominant expression in somatic cells of the ovary, likely to counter TE mobilisation in this tissue. This study provides compelling evidence of co-evolution between virus-like Gypsy family transposons and a host defence mechanism in form of soma-expressed, unistrand piRNA clusters.
2023-09-26 | GSE225887 | GEO
Project description:Drosophila melanogaster ovary piRNA sequencing
| PRJNA208627 | ENA
Project description:PIWI-associated piRNA in Drosophila melanogaster ovary
| PRJNA102681 | ENA
Project description:The control of transposable element (TE) activity in germ cells provides genome integrity over generations. A distinct small RNA-mediated pathway utilizing Piwi-interacting RNAs (piRNAs) suppresses TE expression in gonads of metazoans. In the fly, primary piRNAs derive from so-called piRNA clusters, which are enriched in damaged repeated sequences. These piRNAs launch a cycle of TE and piRNA cluster transcript cleavages resulting in the amplification of piRNA and TE silencing. Using genome-wide comparison of TE insertions and ovarian small RNA libraries from two Drosophila strains, we found that individual TEs inserted into euchromatic loci form novel dual-stranded piRNA clusters. Formation of the piRNA-generating loci by active individual TEs provides a more potent silencing response to the TE expansion. Like all piRNA clusters, individual TEs are also capable of triggering the production of endogenous small interfering (endo-si) RNAs. Small RNA production by individual TEs spreads into the flanking genomic regions including coding cellular genes. We show that formation of TE-associated small RNA clusters can down-regulate expression of nearby genes in ovaries. Integration of TEs into the 3' untranslated region of actively transcribed genes induces piRNA production towards the 3'-end of transcripts, causing the appearance of genic piRNA clusters, a phenomenon that has been reported in different organisms. These data suggest a significant role of TE-associated small RNAs in the evolution of regulatory networks in the germline. The fractions of small RNAs (19-29 nt) from ovaries of y[1]; cn[1] bw[1] sp[1] line of Drosophila melanogaster were sequenced using Illumina HiSeq 2000.
2014-02-07 | E-GEOD-46105 | biostudies-arrayexpress
Project description:Transposable element (TE) activity is repressed in animal gonads by PIWI-interacting RNAs (piRNAs) produced by piRNA clusters. Current models propose that piRNA clusters are functionally defined by the maternal inheritance of piRNAs produced during the previous generation. Taking advantage of an inactive cluster of P-element derived transgene insertions in Drosophila melanogaster, we show here that raising flies at high temperature (29°C) instead of 25°C results in stable conversion of this locus into an active piRNAs producing one reporting thus the first case of the establishment of an active piRNA cluster by environmental changes and without maternal inheritance of homologous piRNAs.
2019-03-14 | GSE116122 | GEO
Project description:Argonaute proteins of the PIWI clade are central to transposon silencing in animal gonads. Their target specificity is defined by 22-30nt PIWI interacting RNAs (piRNAs), which mostly originate from discrete genomic loci termed piRNA clusters. Here we show that the RDC complex composed of Rhino, Deadlock and Cutoff defines dual-strand piRNA clusters genome-wide in Drosophila ovaries. The RDC complex is anchored to H3K9me3-marked chromatin in part via RhinoM-bM-^@M-^Ys chromo-domain. Depletion of Piwi results in loss of the RDC and small RNAs at euchromatic piRNA source loci, demonstrating a feedback loop between Piwi and genomic piRNA sources. Intriguingly, profiles of RNA Polymerase II occupancy, nascent transcription and steady-state RNA levels reveal that the RDC licenses non-canonical transcription of dual-stranded piRNA clusters. Likely, this process involves 5M-bM-^@M-^Yend protection of nascent RNAs and subsequent suppression of transcription termination. Together, our data provide a comprehensive model for the regulation and evolution of piRNA clusters. This study aims at indentifying and characterizing genimc sources of piRNA percursour transcripts using genome-wide apporaches such as ChIP-seq, RNA-seq, smallRNA-seq and GRO-seq in adult Drosophila ovaries depleted for several factors implicated in piRNA cluster regulation
2014-06-08 | E-GEOD-55824 | biostudies-arrayexpress
Project description:Argonaute proteins of the PIWI clade are central to transposon silencing in animal gonads. Their target specificity is defined by 22-30nt PIWI interacting RNAs (piRNAs), which mostly originate from discrete genomic loci termed piRNA clusters. Here we show that the RDC complex composed of Rhino, Deadlock and Cutoff defines dual-strand piRNA clusters genome-wide in Drosophila ovaries. The RDC complex is anchored to H3K9me3-marked chromatin in part via Rhino’s chromo-domain. Depletion of Piwi results in loss of the RDC and small RNAs at euchromatic piRNA source loci, demonstrating a feedback loop between Piwi and genomic piRNA sources. Intriguingly, profiles of RNA Polymerase II occupancy, nascent transcription and steady-state RNA levels reveal that the RDC licenses non-canonical transcription of dual-stranded piRNA clusters. Likely, this process involves 5’end protection of nascent RNAs and subsequent suppression of transcription termination. Together, our data provide a comprehensive model for the regulation and evolution of piRNA clusters.
2014-06-08 | GSE55824 | GEO
Project description:Small non-coding RNAs that associate with Piwi proteins, called piRNAs, serve as guides for repression of diverse transposable elements in germ cells of Metazoa. In Drosophila, the genomic regions that give rise to piRNAs, the so-called piRNA clusters, are transcribed to generate long precursor molecules that are processed into mature piRNAs. How genomic regions that give rise to piRNA precursor transcripts are differentiated from the rest of the genome and how these transcripts are specifically channeled into the piRNA biogenesis pathway are not known. We found that trans-generationally inherited piRNAs provide the critical trigger for piRNA production from homologous genomic regions in the next generation by two different mechanisms. First, inherited piRNAs enhance processing of homologous transcripts into mature piRNAs by initiating the ping-pong cycle in the cytoplasm. Second, inherited piRNAs induce installment of the H3K9me3 mark on genomic piRNA cluster sequences. The HP1 homolog Rhino binds to the H3K9me3 mark through its chromodomain and is enriched over piRNA clusters. Rhino recruits the piRNA biogenesis factor Cutoff to piRNA clusters and is required for efficient transcription of piRNA precursors. We propose that trans-generationally inherited piRNAs act as an epigenetic memory for identification of substrates for piRNA biogenesis on two levels, by inducing a permissive chromatin environment for piRNA precursor synthesis and by enhancing processing of these precursors. ChIPseq of Rhino and Cutoff in Drosophila melanogaster ovaries The Rhino-BioTAP flies were made by fusing the BioTAP tag (Alekseyenko et al. 2014 )to the C-terminal region of the Rhino gene under the UASp promoter. The Cutoff-EGFP fly line (Nanos-GAL4/UASp-Cutoff-GFP), Cuff^wm25 and Cuff^qq37 were a generous gift from T. Schupbach.
2014-07-26 | E-GEOD-59604 | biostudies-arrayexpress