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Caenorhabditis elegans

ABSTRACT: Analysis of transgene siRNAs and ARL-8-dependent siRNAs in Caenorhabditis elegans

PROVIDER: PRJNA230012 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1039540.fastq.gz	Fastqsanger.gz
	SRR1039541.fastq.gz	Fastqsanger.gz
	SRR1039542.fastq.gz	Fastqsanger.gz
	SRR1039543.fastq.gz	Fastqsanger.gz
	SRR1039544.fastq.gz	Fastqsanger.gz

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Analysis of transgene siRNAs and ARL-8-dependent siRNAs in Caenorhabditis elegans

Project description:We analyzed the C. elegans small RNA response to high copy transgene sequences expressed in the soma in a wild type and an eri-6/7 mutant background. We also analyzed small RNA defects in the arl-8(tm2472) mutant. Transgene siRNAs are 22 nt long, mostly antisense, and correspond to the promoter, coding regions, the 3'UTR and plamsid sequences present on the transgene. Transgene siRNAs are decreased in the eri-6/7 mutant. In the arl-8 mutant, 26G siRNAs in the ALG-3/4 dependent endogenous RNAi pathway are decreased.

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Project description:Small RNAs, including piRNAs, miRNAs and endogenous siRNAs, bind Argonaute proteins to form RNA-silencing complexes that target coding genes, transposons and aberrant RNAs. To assess the requirements for endogenous siRNA formation and activity in C. elegans, we developed a GFP-based sensor for the endogenous siRNA 22G siR-1, one of a set of abundant siRNAs processed from a precursor RNA mapping to the X chromosome, the X-cluster. Silencing of the sensor is also dependent on the partially complementary, unlinked 26G siR-O7 siRNA. We show that 26G siR-O7 acts in trans to initiate 22G siRNA formation from the X-cluster. The presence of several mispairs between 26G siR-O7 and the X-cluster mRNA, as well as mutagenesis of the siRNA sensor, indicates that siRNA target recognition is permissive to a degree of mispairing. From a candidate reverse genetic screen, we identified several factors required for 22G siR-1 activity, including the Argonaute ergo-1 and the 3' methyltransferase henn-1. Quantitative RT-PCR of small RNAs in a henn-1 mutant and deep sequencing of methylated small RNAs indicate that siRNAs and piRNAs that associate with PIWI clade Argonautes are methylated by HENN-1, while siRNAs and miRNAs that associate with non-PIWI clade Argonautes are not. Thus, PIWI-class Argonaute proteins are specifically adapted to associate with methylated small RNAs in C. elegans. This SuperSeries is composed of the following subset Series: GSE34320: Analysis of 22G siRNA triggered siRNA amplification in Caenorhabditis elegans GSE34321: Analysis of 3' 2'-O-methylated small RNAs in Caenorhabditis elegans Refer to individual Series

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