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Mmi1 RNA surveillance machinery directs RNAi complex RITS to specific meiotic genes in fission yeast
Author(s) -
Hiriart Edwige,
Vavasseur Aurélia,
TouatTodeschini Leila,
Yamashita Akira,
Gilquin Benoit,
Lambert Emeline,
Perot Jonathan,
Shichino Yuichi,
Nazaret Nicolas,
Boyault Cyril,
Lachuer Joel,
Perazza Daniel,
Yamamoto Masayuki,
Verdel André
Publication year - 2012
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1038/emboj.2012.105
Subject(s) - biology , rna interference , schizosaccharomyces pombe , genetics , schizosaccharomyces , gene , rna silencing , gene silencing , rna , rna induced transcriptional silencing , rasirna , microbiology and biotechnology , saccharomyces cerevisiae
RNA interference (RNAi) silences gene expression by acting both at the transcriptional and post‐transcriptional levels in a broad range of eukaryotes. In the fission yeast Schizosaccharomyces pombe the RNA‐Induced Transcriptional Silencing (RITS) RNAi complex mediates heterochromatin formation at non‐coding and repetitive DNA. However, the targeting and role of RITS at other genomic regions, including protein‐coding genes, remain unknown. Here we show that RITS localizes to specific meiotic genes and mRNAs. Remarkably, RITS is guided to these meiotic targets by the RNA‐binding protein Mmi1 and its associated RNA surveillance machinery that together degrade selective meiotic mRNAs during vegetative growth. Upon sexual differentiation, RITS localization to the meiotic genes and mRNAs is lost. Large‐scale identification of Mmi1 RNA targets reveals that RITS subunit Chp1 associates with the vast majority of them. In addition, loss of RNAi affects the effective repression of sexual differentiation mediated by the Mmi1 RNA surveillance machinery. These findings uncover a new mechanism for recruiting RNAi to specific meiotic genes and suggest that RNAi participates in the control of sexual differentiation in fission yeast.