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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
TranscriptomicsA growth-essential Tetrahymena Piwi protein carries tRNA fragment cargo
Argonaute/Piwi proteins associate with small RNAs that typically provide sequence specificity for RNP function in gene and genome regulation. Here we show that Twi12, a Tetrahymena Piwi protein essential for growth, is loaded with mature tRNA fragments. The tightly bound ~18-22 nt tRNA 3M-bM-^@M-^Y ...
ORGANISM(S): Tetrahymena thermophila 
2010-10-26 | E-GEOD-24916 | biostudies-arrayexpress
TranscriptomicsMIWI catalysis is required for piRNA amplification-independent LINE1 transposon silencing [deep sequencing]
Here we show that MIWI is a small RNA-guided ribonuclease (Slicer) that requires extensive complementarity for target cleavage in vitro. Disruption of its catalytic activity in mice by a single point mutation results in male infertility and displays increased accumulation of LINE1 transposon transcr...
ORGANISM(S): Mus musculus 
2011-11-30 | E-GEOD-32184 | biostudies-arrayexpress
TranscriptomicsGlobal effects of the CSR-1 RNA interference pathway on transcriptional landscape
Argonaute proteins and their small RNA co-factors short interfering RNAs (siRNAs) are known to inhibit gene expression at the transcriptional and post-transcriptional levels. In Caenorhabditis elegans, the Argonaute CSR-1 binds thousands of endogenous siRNAs (endo-siRNAs) antisense to germline trans...
ORGANISM(S): Caenorhabditis elegans 
2014-02-28 | E-GEOD-49946 | biostudies-arrayexpress
TranscriptomicspiRNA-guided slicing of transposon transcripts enforces their transcriptional silencing via specifying the nuclear piRNA repertoire
PIWI-clade Argonaute proteins silence transposon expression in animal gonads. Their target specificity is defined by bound ~23-30nt piRNAs that are processed from single-stranded precursor transcripts via two distinct pathways. Primary piRNAs are defined by the endo-nuclease Zucchini, while biogenes...
ORGANISM(S): Drosophila melanogaster 
2015-08-31 | E-GEOD-71775 | biostudies-arrayexpress
TranscriptomicsConservation of small RNA pathways in platypus
Small RNA pathways play evolutionarily conserved roles in gene regulation and in defense from pathogenic and parasitic nucleic acids. The character and expression patterns of small RNAs show conservation throughout animal lineages, but specific animal clades also show variations on these recurring t...
ORGANISM(S): Tachyglossus aculeatus 
2008-05-20 | E-GEOD-10571 | biostudies-arrayexpress
TranscriptomicsProteomic analysis of murine Piwi proteins reveals a role for arginine methylation in specifying interaction with Tudor family members
In germ cells, Piwi proteins interact with a specific class of small non-coding RNAs, piwi-interacting RNAs (piRNAs). Together, these form a pathway that represses transposable elements, thus safeguarding germ cell genomes. While basic models describe the operation of piRNA pathways, neither the pr...
ORGANISM(S): Mus musculus 
2009-07-25 | E-GEOD-17319 | biostudies-arrayexpress
TranscriptomicspiRNA libraries from Drosophila melanogaster ovaries
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 predomin...
ORGANISM(S): Drosophila melanogaster 
2007-03-08 | E-GEOD-6734 | 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
TranscriptomicsThe MID-PIWI module of Piwi proteins specifies nucleotide- and strand-biases of piRNAs
Piwi-interacting RNAs (piRNAs) guide Piwi Argonautes to suppress transposon activity in animal gonads. Known piRNA populations are extremely complex, with millions of individual sequences present in a single organism. Despite this complexity, specific Piwi proteins incorporate piRNAs with distinct n...
ORGANISM(S): Bombyx mori 
2014-07-01 | E-GEOD-55451 | biostudies-arrayexpress
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