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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
TranscriptomicsAn Ancient Transcription Factor Initiates the Burst of piRNA Production During Early Meiosis in Mouse Testes (smallRNA-Seq)
Animal germ cells produce PIWI-interacting RNAs (piRNAs), small silencing RNAs that suppress transposons and enable gamete maturation. Mammalian transposon-silencing piRNAs accumulate early in spermatogenesis, whereas pachytene piRNAs are produced later during post-natal spermatogenesis and account ...
ORGANISM(S): Gallus gallus 
2013-03-27 | E-GEOD-45049 | 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
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
TranscriptomicsMultiple epigenetic mechanisms and the piRNA pathway enforce LINE1 silencing during adult spermatogenesis
The Piwi protein Mili and the Piwi-interacting RNA (piRNA) pathway are required to establish L1 DNA methylation during epigenetic reprogramming that accompanies male germ cell development. Although Mili is expressed throughout most of adult spermatogenesis, its function therein remains unknown. We f...
ORGANISM(S): Mus musculus 
2013-07-03 | E-MTAB-1557 | biostudies-arrayexpress
TranscriptomicsMouse MOV10L1 associates with Piwi proteins and is an essential component of the piRNA pathway
Piwi-interacting RNAs (piRNAs) are essential for silencing of transposable elements in the germline but their biogenesis is poorly understood. Here we demonstrate that MOV10L1, a germ cell-specific putative RNA helicase, is associated with Piwi proteins. Genetic disruption of the MOV10L1 RNA helicas...
ORGANISM(S): Mus musculus 
2010-06-12 | E-GEOD-21763 | biostudies-arrayexpress
TranscriptomicsThe genetic framework of the Drosophila piRNA pathway
The animal piRNA pathway is a small RNA silencing system that acts in gonads and protects the genome against the deleterious influence of transposons. A major bottleneck in the field is the lack of comprehensive knowledge of the factors and molecular processes that constitute this pathway. We conduc...
ORGANISM(S): Drosophila melanogaster 
2013-05-10 | E-GEOD-45894 | biostudies-arrayexpress
GenomicspiRNA production requires heterochromatin formation in Drosophila
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...
ORGANISM(S): Drosophila melanogaster 
2011-09-08 | E-GEOD-30157 | 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
TranscriptomicsVreteno, a gonad-specific protein, is essential for germline development and primary piRNA biogenesis in Drosophila.
Here, we analyzed small RNA libraries derived from ovarian tissues heterozygous or mutant for the Tudor gene, Vreteno. In the absence of vret, Piwi-bound piRNAs are lost without changes in piRNA precursor transcript production, supporting a role for Vret in primary piRNA biogenesis. In the germline,...
ORGANISM(S): Drosophila melanogaster 
2011-08-15 | E-GEOD-30088 | biostudies-arrayexpress
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