Transcriptomics

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The Caenorhabditis elegans RDE-10/RDE-11 complex regulates RNAi by promoting secondary siRNA amplification


ABSTRACT: From a forward genetic screen for C. elegans genes required for RNAi, we identified rde-10 and through proteomic analysis of RDE-10-interacting proteins, we identified a protein complex containing the new RNAi factor RDE-11, the known RNAi factors RSD-2 and ERGO-1, as well as other candidate RNAi factors. The newly identified RNAi defective genes rde-10 and rde-11 encode a novel protein and a RING-type zinc finger domain protein, respectively. Mutations in rde-10 and rde-11 genes cause dosage-sensitive RNAi deficiencies: these mutants are resistant to low dosage, but sensitive to high dosage of double-stranded RNAs. We assessed the roles of rde-10, rde-11, and the dosage-sensitive RNAi defective genes rsd-2, rsd-6 and haf-6 in both exogenous and endogenous small RNA pathways using high-throughput sequencing and qRT-PCR. These genes are required for the accumulation of secondary siRNAs in both exogenous and endogenous RNAi pathways. Small RNA analysis by deep sequencing in various wild type and mutant C. elegans strains.

ORGANISM(S): Caenorhabditis elegans  

SUBMITTER: Taiowa Montgomery  Chi Zhang    

PROVIDER: E-GEOD-37083 | ArrayExpress | 2012-04-07

SECONDARY ACCESSION(S): GSE37083SRP012103PRJNA158125

REPOSITORIES: GEO, ArrayExpress, ENA

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The Caenorhabditis elegans RDE-10/RDE-11 complex regulates RNAi by promoting secondary siRNA amplification.

Zhang Chi C   Montgomery Taiowa A TA   Fischer Sylvia E J SE   Garcia Susana M D A SM   Riedel Christian G CG   Fahlgren Noah N   Sullivan Christopher M CM   Carrington James C JC   Ruvkun Gary G  

Current biology : CB 20120426 10


In nematodes, plants, and fungi, RNAi is remarkably potent and persistent due to the amplification of initial silencing signals by RNA-dependent RNA polymerases (RdRPs). In Caenorhabditis elegans (C. elegans), the interaction between the RNA-induced silencing complex (RISC) loaded with primary small interfering RNAs (siRNAs) and the target messenger RNA (mRNA) leads to the recruitment of RdRPs and synthesis of secondary siRNAs using the target mRNA as the template. The mechanism and genetic requ  ...[more]

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