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Changes in gene expression in fruitfly ovaries in mutants affecting components of rasiRNA system

ABSTRACT: rasiRNA (rasiRNAs, repeat-associated short interfering RNAs) system is a mechanism of silencing of mobile element transpositions in germline of a number of species including Drosophila melanogaster. rasiRNA itself is a short RNAs which participate in transposon transcription repression and mRNA degradation. Defects in rasiRNA system lead to increased transposition rate and developmental abnormalities due to accumulation of double-strand DNA breaks in fruitfly testes and ovaries. A number of proteins participate in rasiRNA-mediated repression including SPN-E (homeless), PIWI and ARMI. Mutations in the genes of these proteins lead to significant mobile element mRNA accumulation. We performed microarray-based study of effects of spn-E mutation on expression in fruitfly ovaries - one of the organs where rasiRNA system work. Our goal was the identification of other (besides mobile elements) targets of rasiRNA system regulation

ORGANISM(S): Drosophila melanogaster

PROVIDER: GSE40768 | GEO | 2013/03/11

SECONDARY ACCESSION(S): PRJNA174859

REPOSITORIES: GEO

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Changes in gene expression in fruitfly ovaries in mutants affecting components of rasiRNA system

Project description:rasiRNA (rasiRNAs, repeat-associated short interfering RNAs) system is a mechanism of silencing of mobile element transpositions in germline of a number of species including Drosophila melanogaster. rasiRNA itself is a short RNAs which participate in transposon transcription repression and mRNA degradation. Defects in rasiRNA system lead to increased transposition rate and developmental abnormalities due to accumulation of double-strand DNA breaks in fruitfly testes and ovaries. A number of proteins participate in rasiRNA-mediated repression including SPN-E (homeless), PIWI and ARMI. Mutations in the genes of these proteins lead to significant mobile element mRNA accumulation. We performed microarray-based study of effects of spn-E mutation on expression in fruitfly ovaries - one of the organs where rasiRNA system work. Our goal was the identification of other (besides mobile elements) targets of rasiRNA system regulation Total RNA samples, extracted from ovaries of spn-E1/spn-Ehls03987 trans-heterozygotes and mix of heterozygotes spn-E1/TM3 and spn-Ehls03987/TM3 (spn-E/+ hereafter), were reverse transcribed, IVT-amplified and labeled with Cy3 or Cy5. Mix of differently labeled aRNAs (spn-E1/spn-Ehls03987 - target, spn-E/+ - reference) was hybridized to Oligo14Kv2 microarray slides (CDMC), washed, scanned and treated in GenePix 6 (Molecular Devices) and subsequently in FlexArray 1.6.1.1 (McGill University and GM-CM-)nome QuM-CM-)bec Innovation Centre). Three biological replica (one sample dye-swapped) were produced and analyzed.

2013-03-11 | E-GEOD-40768 | biostudies-arrayexpress

RNA helicase Spn-E is required to maintain Aub and AGO3 protein levels for piRNA silencing in the germline of Drosophila

Project description:Germline-specific RNA helicase Spindle-E (Spn-E) is known to be essential for piRNA silencing in Drosophila that takes place mainly in the perinuclear nuage granules. Loss-of-function spn-E mutations lead to tandem Stellate genes derepression in the testes and retrotransposon mobilization in the ovaries. However, Spn-E functions in the piRNA pathway are still obscure. Analysis of total library of short RNAs from the testes of spn-E heterozygous flies revealed the presence of abundant piRNA ping-pong pairs originating from Su(Ste) transcripts. The abundance of these ping-pong pairs were sharply reduced in the library from the testes of spn-E mutants. Thus we found that ping-pong mechanism contributed to Su(Ste) piRNA generation in the testes. The lack of Spn-E caused a significant drop of protein levels of key ping-pong participants, Aubergine (Aub) and AGO3 proteins of PIWI subfamily, in the germline of both males and females, but did not disrupt of their assembly in nuage granules. We found that observed decline of the protein expression was not caused by suppression of aub and ago3 transcription as well as total transcription, indicating possible contribution of Spn-E to post-transcriptional regulation.

2016-06-08 | GSE50984 | GEO

Daedalus and Gasz recruit Armitage to mitochondria, bringing piRNA precursors to the biogenesis machinery

Project description:The piRNA pathway is a small RNA-based immune system that silences mobile genetic elements in animal germlines. piRNA biogenesis requires a specialised machinery that converts long single-stranded precursors into small RNAs of ~25-nucleotides in length. This process involves factors that operate in two different subcellular compartments: the nuage/Yb-body and mitochondria. How these two sites communicate to achieve accurate substrate selection and efficient processing remains unclear. Here, we investigate a previously uncharacterized piRNA biogenesis factor, Daedalus (Daed), that is located on the outer mitochondrial membrane. Daed is essential for Zucchini-mediated piRNA production and for the correct localisation of the indispensable piRNA biogenesis factor Armitage (Armi). We find that Gasz and Daed interact with each other and likely provide a mitochondrial “anchoring platform” to ensure that Armi is held in place, proximal to Zucchini, during piRNA precursor processing. Our data suggest that Armi initially identifies piRNA precursors in nuage/Yb-body in a manner that depends upon Piwi and then moves to mitochondria to present them to the biogenesis machinery. These results represent a significant step in understanding a critical aspect of transposon silencing, namely how RNAs are chosen to instruct the piRNA machinery in the nature of its silencing targets.

2019-04-17 | GSE129321 | GEO

Drosophila melanogaster

Project description:Changes in gene expression in fruitfly ovaries in mutants affecting components of rasiRNA system

| PRJNA174859 | ENA

Characterization of expression changes in armi,rhino,aub,ago3 mutants by tiling array

Project description:We characterized changes of transposon and mRNA expressions in armi, rhino ,aub, ago3 mutants with respect to wild type using Affy tiling array. In most of these mutants, mRNA expressions were mostly unchanged but increased expressions was observed for many transposons indicating the role of these proteins in silencing transposons in Drosophila ovaries Keywords: Tiling array transcriptome profiling

2009-05-03 | GSE14370 | GEO

Daedalus and Gasz recruit Armitage to mitochondria, bringing piRNA precursors to the biogenesis machinery

Project description:The piRNA pathway is a small RNA-based immune system that silences mobile genetic elements in animal germlines. piRNA biogenesis requires a specialised machinery that converts long single-stranded precursors into small RNAs of ~25-nucleotides in length. This process involves factors that operate in two different subcellular compartments: the nuage/Yb-body and mitochondria. How these two sites communicate to achieve accurate substrate selection and efficient processing remains unclear. Here, we investigate a previously uncharacterized piRNA biogenesis factor, Daedalus (Daed), that is located on the outer mitochondrial membrane. Daed is essential for Zucchini-mediated piRNA production and for the correct localisation of the indispensable piRNA biogenesis factor, Armitage (Armi). We find that Gasz and Daed interact with each other and likely provide a mitochondrial “anchoring platform” to ensure that Armi is held in place, proximal to Zucchini, during piRNA processing. Our data suggest that Armi initially identifies piRNA precursors in nuage/Yb-body in a manner that depends upon Piwi and then moves to mitochondria to present precursors to the mitochondrial biogenesis machinery. These results represent a significant step in understanding a critical aspect of transposon silencing, namely how RNAs are chosen to instruct the piRNA machinery in the nature of its silencing targets.

2019-04-18 | PXD013405 | Pride

Daedalus and Gasz recruit Armitage to mitochondria, bringing piRNA precursors to the biogenesis machinery

2019-04-18 | PXD013417 | Pride

Daedalus and Gasz recruit Armitage to mitochondria, bringing piRNA precursors to the biogenesis machinery

Project description:The piRNA pathway is a small RNA-based immune system that silences mobile genetic elements in animal germlines. piRNA biogenesis requires a specialised machinery that converts long single-stranded precursors into small RNAs of ~25-nucleotides in length. This process involves factors that operate in two different subcellular compartments: the nuage/Yb-bodies and mitochondria. How these two sites communicate to achieve accurate substrate selection and efficient processing remains unclear. Here, we investigate a previously uncharacterized piRNA biogenesis factor, Daedalus (Daed), that is located on the outer mitochondrial membrane. Daed is essential for Zucchini-mediated piRNA production and for the correct localisation of the indispensable piRNA biogenesis factor, Armitage (Armi). We find that Gasz and Daed interact with each other and likely provide a mitochondrial “anchoring platform” to ensure that Armi is held in place, proximal to Zucchini, during piRNA processing. Our data suggest that Armi initially identifies piRNA precursors in nuage/Yb-bodies in a manner that depends upon Piwi and then moves to mitochondria to present precursors to the mitochondrial biogenesis machinery. These results represent a significant step in understanding a critical aspect of transposon silencing, namely how RNAs are chosen to instruct the piRNA machinery in the nature of its silencing targets.

2019-04-18 | PXD013403 | Pride

Daedalus and Gasz recruit Armitage to mitochondria, bringing piRNA precursors to the biogenesis machinery

Project description:The piRNA pathway is a small RNA-based immune system that silences mobile genetic elements in animal germlines. piRNA biogenesis requires a specialised machinery that converts long single-stranded precursors into small RNAs of ~25-nucleotides in length. This process involves factors that operate in two different subcellular compartments: the nuage/Yb-body and mitochondria. How these two sites communicate to achieve accurate substrate selection and efficient processing remains unclear. Here, we investigate a previously uncharacterized piRNA biogenesis factor, Daedalus (Daed), that is located on the outer mitochondrial membrane. Daed is essential for Zucchini-mediated piRNA production and for the correct localisation of the indispensable piRNA biogenesis factor, Armitage (Armi). We find that Gasz and Daed interact with each other and likely provide a mitochondrial “anchoring platform” to ensure that Armi is held in place, proximal to Zucchini, during piRNA processing. Our data suggest that Armi initially identifies piRNA precursors in nuage/Yb-body in a manner that depends upon Piwi and then moves to mitochondria to present precursors to the mitochondrial biogenesis machinery. These results represent a significant step in understanding a critical aspect of transposon silencing, namely how RNAs are chosen to instruct the piRNA machinery in the nature of its silencing targets.

2019-04-18 | PXD013404 | Pride

A small RNA mechanism distinct from the RNAi and microRNA pathways silences selfish genetic elements in Drosophila.

Project description:In flies, repeat-associated small interfering RNAs (rasiRNAs) ensure genomic stability by silencing endogenous selfish genetic elements such as retrotransposons and repetitive sequences. Here, we show that while small interfering RNAs (siRNAs) derive from both the sense and antisense strands of their double-stranded RNA precursors, rasiRNAs arise mainly from the antisense strand. rasiRNA production appear not to require Dicer-1, which makes microRNAs, or Dicer-2, which makes siRNAs, and rasiRNAs lack the 2´,3´ hydroxy termini characteristic of animal siRNA and miRNA. Unlike siRNAs and miRNAs, rasiRNAs function through the Piwi, rather than the Ago, Argonaute protein subfamily. Thus, rasiRNAs define a third RNA silencing pathway distinct from both the miRNA and RNAi pathways. Keywords: gene silencing; post-transcriptional gene regulation; short RNAs; RNAi; rasiRNAs; rasiRNA; microRNAs; microRNA; siRNAs; siRNA

2006-06-30 | GSE4932 | GEO

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