title: Trans-acting antisense RNAs mediate transcriptional gene cosuppression in S. cerevisiae.
abstract: Homology-dependent gene silencing, a phenomenon described as cosuppression in plants, depends on siRNAs. We provide evidence that in Saccharomyces cerevisiae, which is missing the RNAi machinery, protein coding gene cosuppression exists. Indeed, introduction of an additional copy of PHO84 on a plasmid or within the genome results in the cosilencing of both the transgene and the endogenous gene. This repression is transcriptional and position-independent and requires trans-acting antisense RNAs. Antisense RNAs induce transcriptional gene silencing both in cis and in trans, and the two pathways differ by the implication of the Hda1/2/3 complex. We also show that trans-silencing is influenced by the Set1 histone methyltransferase, which promotes antisense RNA production. Finally we show that although antisense-mediated cis-silencing occurs in other genes, trans-silencing so far depends on features specific to PHO84. All together our data highlight the importance of noncoding RNAs in mediating RNAi-independent transcriptional gene silencing.
authors: Department of Cell Biology, University of Geneva, Geneva, Switzerland.
authors: Jurgi
authors: J
authors: Camblong
authors: Nissrine
authors: N
authors: Beyrouthy
authors: Elisa
authors: E
authors: Guffanti
authors: Guillaume
authors: G
authors: Schlaepfer
authors: Lars M
authors: LM
authors: Steinmetz
authors: Françoise
authors: F
authors: Stutz
mesh_terms: D004268:DNA-Binding Proteins / Q000378:metabolism; D018628:Gene Dosage / Q000235:genetics; D015966:Gene Expression Regulation, Fungal; D020868:Gene Silencing; D006655:Histone Deacetylases / Q000378:metabolism; D011495:Histone-Lysine N-Methyltransferase; D028081:Proton-Phosphate Symporters / Q000235:genetics; D016372:RNA, Antisense / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism; D013489:Suppression, Genetic / Q000235:genetics*; D015534:Trans-Activators / Q000378:metabolism; D014157:Transcription Factors / Q000378:metabolism
chemical_list: D004268:DNA-Binding Proteins; C105495:PHO84 protein, S cerevisiae; D028081:Proton-Phosphate Symporters; D016372:RNA, Antisense; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators; D014157:Transcription Factors; D011495:Histone-Lysine N-Methyltransferase; C411250:SET1 protein, S cerevisiae; D006655:Histone Deacetylases