Article ; Online: An essential role for the piRNA pathway in regulating the ribosomal RNA pool in C. elegans.
2021 Volume 56, Issue 16, Page(s) 2295–2312.e6
Abstract: Piwi-interacting RNAs (piRNAs) are RNA effectors with key roles in maintaining genome integrity and promoting fertility in metazoans. In Caenorhabditis elegans loss of piRNAs leads to a transgenerational sterility phenotype. The plethora of piRNAs and ... ...
Abstract | Piwi-interacting RNAs (piRNAs) are RNA effectors with key roles in maintaining genome integrity and promoting fertility in metazoans. In Caenorhabditis elegans loss of piRNAs leads to a transgenerational sterility phenotype. The plethora of piRNAs and their ability to silence transcripts with imperfect complementarity have raised several (non-exclusive) models for the underlying drivers of sterility. Here, we report the extranuclear and transferable nature of the sterility driver, its suppression via mutations disrupting the endogenous RNAi and poly-uridylation machinery, and copy-number amplification at the ribosomal DNA locus. In piRNA-deficient animals, several small interfering RNA (siRNA) populations become increasingly overabundant in the generations preceding loss of germline function, including ribosomal siRNAs (risiRNAs). A concomitant increase in uridylated sense rRNA fragments suggests that poly-uridylation may potentiate RNAi-mediated gene silencing of rRNAs. We conclude that loss of the piRNA machinery allows for unchecked amplification of siRNA populations, originating from abundant highly structured RNAs, to deleterious levels. |
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MeSH term(s) | Animals ; Caenorhabditis elegans ; Epigenesis, Genetic ; Female ; Fertility/genetics ; Oogonial Stem Cells/cytology ; Oogonial Stem Cells/metabolism ; RNA Processing, Post-Transcriptional ; RNA, Ribosomal/genetics ; RNA, Ribosomal/metabolism ; RNA, Small Interfering/genetics ; RNA, Small Interfering/metabolism |
Chemical Substances | RNA, Ribosomal ; RNA, Small Interfering |
Language | English |
Publishing date | 2021-08-12 |
Publishing country | United States |
Document type | Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't |
ZDB-ID | 2054967-2 |
ISSN | 1878-1551 ; 1534-5807 |
ISSN (online) | 1878-1551 |
ISSN | 1534-5807 |
DOI | 10.1016/j.devcel.2021.07.014 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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