Project description:P granules are perinuclear condensates in C. elegans germ cells proposed to serve as hubs for self/non-self RNA discrimination by Argonautes. We report that a mutant (meg-3 meg-4) that does not assemble P granules in primordial germ cells loses competence for RNA-interference over several generations and accumulates silencing small RNAs against hundreds of endogenous genes, including the RNA-interference genes rde-11 and sid-1. In wild type, rde-11 and sid-1 transcripts are heavily targeted by piRNAs and accumulate in P granules but maintain expression. In the primordial germ cells of meg-3 meg-4 mutants, rde-11 and sid-1 transcripts disperse in the cytoplasm with the small RNA biogenesis machinery, become hyper-targeted by secondary sRNAs, and are eventually silenced. Silencing requires the PIWI-class Argonaute PRG-1 and the nuclear Argonaute HRDE-1 that maintains trans-generational silencing of piRNA targets. These observations support a "safe harbor" model for P granules in protecting germline transcripts from piRNA-initiated silencing.
Project description:This data series contains small RNA high-throughput sequencing data derived from cell lysates and FLAG::HRDE-1 immunoprecipitates (IP) after resetting RNAi in the presence or absence of piRNAs in C. elegans. Small RNAs were isolated from adult wild type and mutant or transgenic C. elegans and subjected to Illumina HiSeq sequencing. The series contains fastq and tab-separated files for 10 libraries.
Project description:This data series contains small RNA high-throughput sequencing data derived from cell lysates and FLAG::HRDE-1 immunoprecipitates (IP) after resetting RNAi in the presence or absence of piRNAs in C. elegans.
