Thermic activation of a piRNA cluster
Ontology highlight
ABSTRACT:
PROVIDER: PRJEB25286 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| ERR2357680.fastq.gz | Fastqsanger.gz | |||
| ERR2357681.fastq.gz | Fastqsanger.gz | |||
| ERR2357682.fastq.gz | Fastqsanger.gz | |||
| ERR2357683.fastq.gz | Fastqsanger.gz | |||
| ERR2357684.fastq.gz | Fastqsanger.gz |
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Project description:Environmentally-induced epigenetic conversion of a piRNA cluster
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Project description:In order to control transposable element (TE) activity, PIWI-interacting RNAs (piRNAs) have been evolved to silence TE transcriptionally and post-transcriptionally, and produced from heterochromatic genomic loci, called piRNA cluster. Maternal inherited piRNAs transmission is considered as the key step of piRNA cluster maintenance and induction of de nove piRNA cluster formation, however, how the original piRNAs were produced without maternal piRNAs deposition remains unclear. In this paper, we created a repetitive GFP reporter and found a Rhino-dependent piRNA cluster conversion spontaneously occurs to the reporter over generations. Importantly, this conversion is reversible by removal of maternal piRNAs of GFP reporter. Taking advantage of this reversible GFP reporter piRNA cluster, we found that siRNA is able to initiate piRNA cluster formation epigenetically, even when only maternal siRNA presence is capable to do so. Our results suggest the importance of siRNA on initiation of piRNA biogenesis and describe a whole picture of initiation and maintenance of piRNA cluster.
2024-01-05 | GSE193091 | GEO
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:This study examines the conservation of Piwi-interacting RNA (piRNA) clusters that come from protein coding gene transcripts. By sequencing small RNA libraries from gonad tissues of Drosophilids and Glires we discover a diverse set of genic piRNA clusters conserved across animals. This dataset reveals new expression patterns for genic piRNA clusters and examines whether changing piRNA expression patterns correlates with sequence changes in piRNA cluster genomic sequence across a variety of animal species.
2015-11-01 | GSE62556 | GEO
Project description:Maternal inherited siRNA initiate piRNA cluster formation
| PRJNA794746 | ENA
Project description:This study examines the conservation of Piwi-interacting RNA (piRNA) clusters that come from protein coding gene transcripts. By sequencing small RNA libraries from gonad tissues of Drosophilids and Glires we discover a diverse set of genic piRNA clusters conserved across animals. This dataset reveals new expression patterns for genic piRNA clusters and examines whether changing piRNA expression patterns correlates with sequence changes in piRNA cluster genomic sequence across a variety of animal species. We dissected gonad tissues consisting of ovaries from wildtype adult Drosophilids (D.melanogaster, D.erecta, D.yakuba, D.virilis) and testes from wildtype pre-pubsecent and adult mouse and rats. Adult testes from rabbits were purchased from Pel-Freez Biologicals. Total or immunopreciptated RNAs were extracted from the pulvirized gonad tissues of Drosophilids and Glires. Small RNAs were purified from these samples, converted into cDNA libraries, and sequenced on an Illumina HiSeq2000.
2015-11-01 | E-GEOD-62556 | biostudies-arrayexpress
Project description:The evolution of genic piRNA cluster loci expression patterns
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Project description:In a broad range of organisms, Piwi-interacting RNAs (piRNAs) have emerged as core components of a surveillance system that protects the genome by silencing transposable and repetitive elements. A vast proportion of piRNAs is produced from discrete genomic loci, termed piRNA clusters. The molecular mechanisms and the factors that govern the expression of these loci are largely unknown. We have preciously shown the Cutoff (Cuff), a protein with similarity to yeast Rai1, is a component of the piRNA pathway. In order to understand the function of the Cuff protein in piRNA production, we produced small RNA libraries from cn, bw (wt) and cuffwm25 mutant ovaties. The analysis of these libraries revealed that approximately 80% of the total piRNA population is depleted in the absence of a functional Cuff protein. We also determined that Cuff is mostly a nuclear protein and is enriched at the level of certain piRNA clusters. Our results point to a role for Cuff in the transcriptional regulation of piRNA generating loci and in the production of the proper piRNA complement during Drosophila oogenesis.
2013-06-07 | GSE47738 | 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
Project description:Here, we analyzed H3K9me3 derived from wild type ovarian tissue. Here we show that deposition of histone 3 lysine 9 by the methyltransferase dSETDB1 (egg) is required for piRNA cluster transcription. In the absence of dSETDB1, cluster precursor transcription collapses in germline and somatic gonadal cells and TEs are activated, resulting in germline loss and a block in germline stem cell differentiation. We propose that heterochromatin protects the germline by activating the piRNA pathway. Examination of H3K9me3 marks in the wild type gonad
2011-09-08 | E-GEOD-30157 | biostudies-arrayexpress