Drosophila melanogaster
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA289709 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR2157934.fastq.gz | Fastqsanger.gz | |||
| SRR2157965.fastq.gz | Fastqsanger.gz | |||
| SRR2158285.fastq.gz | Fastqsanger.gz | |||
| SRR2157966.fastq.gz | Fastqsanger.gz | |||
| SRR2159386.fastq.gz | Fastqsanger.gz |
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Project description:Transcription from alternative transcription start sites (TSSs) is prevalent among mammalian genes and has important biological functions. However, how TSSs are selected remains elusive. We identified 87 genes with altered TSS usage (ATU) in Piwi-deficient Drosophila ovaries using the cap-analysis gene expression sequencing (CAGE-seq) method. Piwi regulates TSS usage of ATU genes in germ cells and somatic cells in ovaries as well as in cultured ovarian somatic cells (OSCs). Correspondingly, RNA Pol II initiation and elongation at TSSs of ATU genes were affected in germline-piwi-knockdown ovaries and piwi-knockdown OSCs. We identified a FACT complex component, Ssrp, as a novel interactor of Piwi in the nucleus. Temporally controlled knockdown of ssrp affected TSS usage of ATU genes whereas overexpression of ssrp partially rescued the TSS usage of ATU genes in piwi mutant ovaries. Thus, Piwi may interact with Ssrp to regulate TSS usage in Drosophila ovaries by affecting Pol II initiation and elongation.
2024-11-29 | GSE277263 | GEO
Project description:Alternative transcription initiation, which refers to the transcription of a gene from different transcription start sites (TSSs), is prevalent in mammalian systems and has important biological functions. Although transcriptional regulation has been extensively studied, the mechanism that selects one TSS over others in a gene remains elusive. We discovered Piwi, an RNA-binding protein, regulated TSS usage of genes and identified 87 genes with significantly altered TSS usage (ATU) in piwi-deficient Drosophila ovaries using the cap-analysis gene expression sequencing (CAGE-seq) method. This regulation occurs in both germline and somatic cells in ovaries as well as in cultured ovarian somatic cells (OSCs). Correspondingly, RNA Pol II initiation and elongation at TSSs of ATU genes were affected in germline-piwi-knockdown ovaries and piwi-knockdown OSCs. We identified a FACT complex component, Ssrp, which is essential for mRNA elongation, as a novel interactor of Piwi in the nucleus. Temporally controlled knockdown of ssrp affected TSS usage of ATU genes whereas overexpression of ssrp partially rescued the TSS usage of ATU genes in piwi mutant ovaries. Thus, Piwi may interact with Ssrp to regulate TSS usage in Drosophila ovaries by affecting Pol II initiation and elongation.
2024-11-29 | GSE255836 | GEO
Project description:Alternative transcription initiation, which refers to the transcription of a gene from different transcription start sites (TSSs), is prevalent in mammalian systems and has important biological functions. Although transcriptional regulation has been extensively studied, the mechanism that selects one TSS over others in a gene remains elusive. We discovered Piwi, an RNA-binding protein, regulated TSS usage of genes and identified 87 genes with significantly altered TSS usage (ATU) in piwi-deficient Drosophila ovaries using the cap-analysis gene expression sequencing (CAGE-seq) method. This regulation occurs in both germline and somatic cells in ovaries as well as in cultured ovarian somatic cells (OSCs). Correspondingly, RNA Pol II initiation and elongation at TSSs of ATU genes were affected in germline-piwi-knockdown ovaries and piwi-knockdown OSCs. We identified a FACT complex component, Ssrp, which is essential for mRNA elongation, as a novel interactor of Piwi in the nucleus. Temporally controlled knockdown of ssrp affected TSS usage of ATU genes whereas overexpression of ssrp partially rescued the TSS usage of ATU genes in piwi mutant ovaries. Thus, Piwi may interact with Ssrp to regulate TSS usage in Drosophila ovaries by affecting Pol II initiation and elongation.
2024-11-29 | GSE255439 | GEO
Project description:Alternative transcription initiation, which refers to the transcription of a gene from different transcription start sites (TSSs), is prevalent in mammalian systems and has important biological functions. Although transcriptional regulation has been extensively studied, the mechanism that selects one TSS over others in a gene remains elusive. We discovered Piwi, an RNA-binding protein, regulated TSS usage of genes and identified 87 genes with significantly altered TSS usage (ATU) in piwi-deficient Drosophila ovaries using the cap-analysis gene expression sequencing (CAGE-seq) method. This regulation occurs in both germline and somatic cells in ovaries as well as in cultured ovarian somatic cells (OSCs). Correspondingly, RNA Pol II initiation and elongation at TSSs of ATU genes were affected in germline-piwi-knockdown ovaries and piwi-knockdown OSCs. We identified a FACT complex component, Ssrp, which is essential for mRNA elongation, as a novel interactor of Piwi in the nucleus. Temporally controlled knockdown of ssrp affected TSS usage of ATU genes whereas overexpression of ssrp partially rescued the TSS usage of ATU genes in piwi mutant ovaries. Thus, Piwi may interact with Ssrp to regulate TSS usage in Drosophila ovaries by affecting Pol II initiation and elongation.
2024-11-29 | GSE255438 | GEO
Project description:Alternative transcription initiation, which refers to the transcription of a gene from different transcription start sites (TSSs), is prevalent in mammalian systems and has important biological functions. Although transcriptional regulation has been extensively studied, the mechanism that selects one TSS over others in a gene remains elusive. We discovered Piwi, an RNA-binding protein, regulated TSS usage of genes and identified 87 genes with significantly altered TSS usage (ATU) in piwi-deficient Drosophila ovaries using the cap-analysis gene expression sequencing (CAGE-seq) method. This regulation occurs in both germline and somatic cells in ovaries as well as in cultured ovarian somatic cells (OSCs). Correspondingly, RNA Pol II initiation and elongation at TSSs of ATU genes were affected in germline-piwi-knockdown ovaries and piwi-knockdown OSCs. We identified a FACT complex component, Ssrp, which is essential for mRNA elongation, as a novel interactor of Piwi in the nucleus. Temporally controlled knockdown of ssrp affected TSS usage of ATU genes whereas overexpression of ssrp partially rescued the TSS usage of ATU genes in piwi mutant ovaries. Thus, Piwi may interact with Ssrp to regulate TSS usage in Drosophila ovaries by affecting Pol II initiation and elongation.
2024-11-29 | GSE255440 | GEO
Project description:Tissue specific Pol II Chip-Seq in the early fly embryo
| PRJNA153345 | ENA
Project description:The piRNA-interacting Piwi protein is involved in transcriptional silencing of transposable elements in ovaries of D. melanogaster. Here we characterized the genome-wide effect of nuclear Piwi elimination on the presence of the heterochromatic H3K9me3 mark and HP1a, as well as on the transcription-associated mark H3K4me2. Our results demonstrate that a significant increase in the H3K4me2 level upon nuclear Piwi loss is not accompanied by the alterations in H3K9me3 and HP1a levels for several germline-expressed transposons, suggesting that in this case Piwi prevents transcription by a mechanism distinct from H3K9 methylation. We found that the targets of Piwi-dependent chromatin repression are mainly related to the elements that display a higher level of H3K4me2 modification in the absence of silencing, i.e. most actively transcribed elements. We also show that Piwi-guided silencing does not significantly influence the chromatin state of dual-strand piRNA-producing clusters. In addition, host protein-coding gene expression is essentially not affected due to the nuclear Piwi elimination, but we noted an increase in small nuclear spliceosomal RNAs abundance and propose Piwi involvement in their posttranscriptional regulation. Our work reveals new aspects of transposon silencing in Drosophila, indicating that transcription of transposons can underpin their Piwi dependent silencing, while canonical heterochromatin marks are not obligatory for their repression. Examination of histone modifications in ovaries from two different fly lines- piwiNt/piwi2 (mutant) and piwi/+ (wildtype)
2014-05-19 | E-GEOD-56347 | biostudies-arrayexpress
Project description:Targeted DamID (TaDa) measures gene expression using a DNA adenine methyltransferase (Dam) fused to RNA polymerase II (Dam Pol II) to methylate DNA as the genome is transcribed (Southall, Gold et al. 2013, PMID: 23792147). Here we use traditional Illumina RNA-Seq to determine if a cell’s expression profile is affected by Dam Pol II expression. Twenty-four hours prior to collection, we ubiquitously drove UAS Dam or UAS Dam Pol II using a tubulin (tub) GAL4 regulated by a temperature sensitive tub GAL80[ts] (McGuire et al. 2003, PMID: 14657498) in adult Drosophila melanogaster (taxon: 7227) whole males, whole females, testes, and ovaries.
2018-06-13 | GSE115694 | GEO
Project description:Drosophila Piwi-family proteins have been implicated in transposon control. Here, we examine piwi-interacting RNAs (piRNAs) associated with each Drosophila Piwi protein and find that Piwi and Aubergine bind RNAs that are predominantly antisense to transposons, whereas Ago3 complexes contain predominantly sense piRNAs. As in mammals, the majority of Drosophila piRNAs are derived from discrete genomic loci. These loci comprise mainly defective transposon sequences, and some have previously been identified as master regulators of transposon activity. Our data suggest that heterochromatic piRNA loci interact with potentially active, euchromatic transposons to form an adaptive system for transposon control. Complementary relationships between sense and antisense piRNA populations suggest an amplification loop wherein each piRNA-directed cleavage event generates the 5’ end of a new piRNA. Thus, sense piRNAs, formed following cleavage of transposon mRNAs, may enhance production of antisense piRNAs, complementary to active elements, by directing cleavage of transcripts from master control loci. Keywords: small RNA libraries from Drosophila ovaries
2007-03-08 | GSE6734 | GEO
Project description:Purpose: To analysis Ova impact on H3K4me2 and pol II patterns in Drosophila ovaries by ChIP-seq Methods: Chromatin Immunoprecipitation to identify H3K4me2 and pol II patterns in Drosophila ovaries Results: Knockdown of Ova increases of H3K4me2 and Pol II in some genomic regions.
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