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| Status |
Public on Oct 04, 2010 |
| Title |
High 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 |
| Organism |
Drosophila melanogaster |
| Experiment type |
Non-coding RNA profiling by high throughput sequencing
|
| Summary |
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 undergoes target dependent amplification. In contrast, gonadal somatic support cells express only Piwi, lack signs of piRNA amplification and exhibit primary piRNA biogenesis from piRNA clusters. Neither piRNA processing/loading nor Piwi mediated target silencing is understood at the genetic, cellular or molecular level. We developed an in vivo RNAi assay for the somatic piRNA pathway and identified the RNA helicase Armitage, the Tudor domain containing RNA helicase Yb and the putative nuclease Zucchini as essential factors for primary piRNA biogenesis. Lack of any of these proteins leads to transposon de-silencing, to a collapse in piRNA levels and to a failure in Piwi nuclear accumulation. We show that Armitage and Yb interact physically and co-localize in cytoplasmic Yb-bodies, which flank P-bodies. Loss of Zucchini leads to an accumulation of Piwi and Armitage in Yb-bodies indicating that Yb-bodies are sites of primary piRNA biogenesis.
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| |
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| Overall design |
small RNA libraries were prepared from Piwi immuno-precipitates of five different genotypes
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| |
|
| Contributor(s) |
Brennecke J, Olivieri D |
| Citation(s) |
20818334 |
| |
| Submission date |
Aug 11, 2010 |
| Last update date |
May 15, 2019 |
| Contact name |
Julius Brennecke |
| E-mail(s) |
julius.brennecke@imba.oeaw.ac.at
|
| Organization name |
IMBA
|
| Street address |
Dr. Bohrgasse 3
|
| City |
Vienna |
| ZIP/Postal code |
1030 |
| Country |
Austria |
| |
|
| Platforms (1) |
| GPL9061 |
Illumina Genome Analyzer II (Drosophila melanogaster) |
|
| Samples (5)
|
| GSM577958 |
Piwi bound piRNAs from tj GAL4 > RNAi-aub ovaries |
| GSM577959 |
Piwi bound piRNAs from tj GAL4 > RNAi-piwi ovaries |
| GSM577960 |
Piwi bound piRNAs from tj GAL4 > RNAi-armi ovaries |
| GSM577961 |
Piwi bound piRNAs from tj GAL4 > RNAi-zuc ovaries |
| GSM577962 |
Piwi bound piRNAs from tj GAL4 > RNAi-fs(1)Yb ovaries |
|
| Relations |
| SRA |
SRP003464 |
| BioProject |
PRJNA131811 |
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