RRC ID 65342
Author Placentino M, de Jesus Domingues AM, Schreier J, Dietz S, Hellmann S, de Albuquerque BF, Butter F, Ketting RF.
Title Intrinsically disordered protein PID-2 modulates Z granules and is required for heritable piRNA-induced silencing in the Caenorhabditis elegans embryo.
Journal EMBO J
Abstract In Caenorhabditis elegans, the piRNA (21U RNA) pathway is required to establish proper gene regulation and an immortal germline. To achieve this, PRG-1-bound 21U RNAs trigger silencing mechanisms mediated by RNA-dependent RNA polymerase (RdRP)-synthetized 22G RNAs. This silencing can become PRG-1-independent and heritable over many generations, a state termed RNA-induced epigenetic gene silencing (RNAe). How and when RNAe is established, and how it is maintained, is not known. We show that maternally provided 21U RNAs can be sufficient for triggering RNAe in embryos. Additionally, we identify PID-2, a protein containing intrinsically disordered regions (IDRs), as a factor required for establishing and maintaining RNAe. PID-2 interacts with two newly identified and partially redundant eTudor domain-containing proteins, PID-4 and PID-5. PID-5 has an additional domain related to the X-prolyl aminopeptidase APP-1, and binds APP-1, implicating potential N-terminal proteolysis in RNAe. All three proteins are required for germline immortality, localize to perinuclear foci, affect size and appearance of RNA inheritance-linked Z granules, and are required for balancing of 22G RNA populations. Overall, our study identifies three new proteins with crucial functions in C. elegans small RNA silencing.
Volume 40(3)
Pages e105280
Published 2021-2-1
DOI 10.15252/embj.2020105280
PMID 33231880
PMC PMC7849312
MeSH Animals Argonaute Proteins / genetics Argonaute Proteins / metabolism Caenorhabditis elegans / embryology* Caenorhabditis elegans / genetics Caenorhabditis elegans / metabolism Caenorhabditis elegans Proteins / chemistry Caenorhabditis elegans Proteins / genetics Caenorhabditis elegans Proteins / metabolism Epigenesis, Genetic Gene Expression Regulation, Developmental Gene Silencing Intrinsically Disordered Proteins / chemistry Intrinsically Disordered Proteins / genetics* Intrinsically Disordered Proteins / metabolism* Protein Binding Protein Domains RNA, Small Interfering / genetics*
C.elegans tm1614 tm1200 tm1414 tm2686 tm1120