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TranscriptomicsPIWI-associated piRNA in Drosophila melanogaster ovary
Heterochromatin, representing the silenced state of transcription, largely consists of transposon-enriched and highly repetitive sequences. Implicated in heterochromatin formation and transcriptional silencing in Drosophila are PIWI and repeat-associated small interfering RNAs (rasiRNAs). Despite th...
ORGANISM(S): Drosophila melanogaster 
2007-10-24 | E-GEOD-9138 | biostudies-arrayexpress
TranscriptomicsHigh throughput sequencing of Piwi bound piRNAs from Drosophila ovaries in which key factors for primary piRNA biogenesis in somatic support cells were knocked down using RNAi
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 und...
ORGANISM(S): Drosophila melanogaster 
2010-10-03 | E-GEOD-23560 | biostudies-arrayexpress
TranscriptomicsFLX sequencing of Piwi-associated small RNAs extracted from Drosophila ovarian somatic cells (OSC)
piRNAs function in silencing retrotransposons by associating with the PIWI proteins, AGO3, Aub, and Piwi, in Drosophila germlines. Bioinformatics analyses of piRNAs in Drosophila ovaries suggested that piRNAs are produced by two systems, the primary processing pathway and the amplification loop, fro...
ORGANISM(S): Drosophila melanogaster 
2009-10-01 | E-GEOD-15137 | biostudies-arrayexpress
TranscriptomicsVreteno, a gonad-specific protein, is essential for germline development and primary piRNA biogenesis in Drosophila
In Drosophila, Piwi proteins associate with Piwi-interacting RNAs (piRNAs) and protect the germline genome by silencing mobile genetic elements. This defense system acts in germline and gonadal somatic tissue to preserve germline development. Genetic control for these silencing pathways varies great...
ORGANISM(S): Drosophila melanogaster 
2011-09-28 | E-GEOD-30360 | biostudies-arrayexpress
TranscriptomicsSpecialized piRNA pathways act in germline and somatic tissues of the Drosophila ovary
Here, we analyzed nine Drosophila piRNA pathway mutants for their impacts on both small RNA populations and the sub-cellular localization patterns of Piwi proteins. We find that distinct piRNA pathways with differing components function in ovarian germ and somatic cells. Keywords: Epigenetics 20 li...
ORGANISM(S): Drosophila melanogaster 
2009-04-29 | E-GEOD-15186 | biostudies-arrayexpress
TranscriptomicsThe Function of Piwi is Independent of Its Slicer Activity
In diverse organisms, the highly-conserved Piwi proteins bind to a complex class of small non-coding RNAs called piRNAs, and are essential for germline stem cell maintenance, transposon silencing, fertility, and offspring viability1. By homology with other Argonautes, Piwi proteins have been propose...
ORGANISM(S): Drosophila melanogaster 
2013-02-04 | E-GEOD-34032 | biostudies-arrayexpress
GenomicsImpact of nuclear Piwi elimination on chromatin state in Drosophila melanogaster ovaries
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-a...
ORGANISM(S): Drosophila melanogaster 
2014-05-19 | E-GEOD-56347 | biostudies-arrayexpress
TranscriptomicsProbing the initiation and effector phases of the somatic piRNA pathway in Drosophila
Combining RNAi in cultured cells and analysis of mutant animals, we probed roles of known piRNA pathway components in the initiation and effector phases of transposon silencing. total RNA and RNA associated with Piwi was isolated and size-fractionated by PAGE into 19-29nt. These were processed and s...
ORGANISM(S): Drosophila melanogaster 
2010-10-25 | E-GEOD-24108 | biostudies-arrayexpress
TranscriptomicspiRNA production requires heterochromatin formation in Drosophila
Here, we analyzed two small RNA libraries derived from ovarian tissue mutant for either the Drosophila SETDB1 gene, or the Bam gene. 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, clust...
ORGANISM(S): Drosophila melanogaster 
2011-08-15 | E-GEOD-30086 | biostudies-arrayexpress
TranscriptomicsThe Cutoff protein regulates piRNA cluster expression and piRNA production in the Drosophila germline
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 ...
ORGANISM(S): Drosophila melanogaster 
2013-06-07 | E-GEOD-47738 | biostudies-arrayexpress
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