Schizosaccharomyces pombe
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA142035 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Clr4/Suv39 and RNA quality control factors cooperate to trigger RNAi and suppress antisense RNA (ChIP)
| PRJNA142037 | ENA
Project description:Histone H2A.Z cooperates with RNAi and heterochromatin factors to suppress antisense RNAs
| PRJNA119129 | ENA
Project description:In the fission yeast Schizosaccharomyces pombe, the RNA interference (RNAi) pathway is required to generate small interfering RNAs (siRNAs) that mediate heterochromatic silencing of centromeric repeats. Here we demonstrate that RNAi also functions to repress genomic elements other than constitutive heterochromatin. Using DamID (DNA adenine methyltransferase identification) we show that Dcr1 and Rdp1 physically associate with some euchromatic genes, non-coding RNA (ncRNA) genes, and retrotransposon long terminal repeats (LTRs), and that this association is independent of the Clr4 histone methyltransferase. Physical association of RNAi with chromatin is sufficient to trigger a silencing response but not to assemble heterochromatin. The mode of silencing at the newly identified RNAi targets is consistent with a co-transcriptional gene silencing model as proposed earlier and functions with trace amounts of siRNAs. We anticipate that similar mechanisms could also be operational in other eukaryotes.
2010-09-25 | GSE24360 | GEO
Project description:In eukaryotes, the Suv39 family of proteins tri-methylate lysine 9 of histone H3 (H3K9me) to form constitutive heterochromatin. However, how Suv39 proteins are nucleated at heterochromatin is not fully described. In the fission yeast, current models posit that Argonaute1-associated small RNAs (sRNAs) nucleate the sole H3K9 methyltransferase, Clr4/SUV39H, to centromeres. Here, we show that in the absence of all sRNAs and H3K9me, the Mtl1 and Red1 core (MTREC)/PAXT complex nucleates Clr4/SUV39H at a heterochromatic long noncoding RNA (lncRNA) at which the two H3K9 deacetylases, Sir2 and Clr3, also accumulate by distinct mechanisms. Iterative cycles of H3K9 deacetylation and methylation spread Clr4/SUV39H from the nucleation center in an sRNA-independent manner, generating a basal H3K9me state. This is acted upon by the RNAi machinery to augment and amplify the Clr4/H3K9me signal at centromeres to establish heterochromatin. Overall, our data reveal that lncRNAs and RNA quality control factors can nucleate heterochromatin and function as epigenetic silencers in eukaryotes.
2024-05-16 | PXD039519 | Pride
Project description:Expression profiling in clr4 null cells versus wild-type cells. Keywords: Expression
2005-08-31 | GSE3187 | GEO
Project description:Schizosaccharomyces pombe clr4 expression
| PRJNA92839 | ENA
Project description:Automethylation-induced conformational switch in Clr4 (Suv39h) maintains epigenetic stability
| PRJNA399201 | ENA
Project description:Survival in quiescence requires the euchromatic deployment of Clr4/SUV39H by Argonaute-associated small RNAs [RNA-Seq]
| PRJNA350396 | ENA
Project description:Strand specific RNA sequencing of S. pombe revealed a highly structured programme of ncRNA expression at over 600 loci. Waves of antisense transcription accompanied sexual differentiation. A substantial proportion of ncRNA arose from mechanisms previously considered to be largely artefactual, including improper 3’ termination and bi-directional transcription. Constitutive induction of the entire spk1+, spo4+, dis1+ and spo6+ antisense transcripts from an integrated, ectopic, locus disrupted their respective meiotic functions. This ability of antisense transcripts to disrupt gene function when expressed in trans suggests that cis production at native loci during sexual differentiation may also control gene function. Consistently, insertion of a marker gene adjacent to the dis1+ antisense start site mimicked ectopic antisense expression in reducing the levels of this microtubule regulator and abolishing the microtubule-dependent “horsetail” stage of meiosis. Antisense production had no impact at any of these loci when the RNAi machinery was removed. Thus, far from being simply ‘genome chatter’, this extensive ncRNA landscape constitutes a fundamental component in the controls that drive the complex programme of sexual differentiation in S. pombe.
2011-12-20 | GSE28113 | GEO