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Clr4/Suv39 and RNA quality control factors cooperate to trigger RNAi and suppress antisense RNA (expression)

ABSTRACT: Expression profile of Schizosaccharomyces pombe genome in ∆mlo3, mlo3-A, mlo3-A∆h2a.z, ∆cid14∆h2a.z and mlo3-A∆cid14 cells. Expression profile of mutant cells compared to wild-type cells.

ORGANISM(S): Schizosaccharomyces pombe

PROVIDER: GSE26995 | GEO | 2011/04/12

SECONDARY ACCESSION(S): PRJNA142035

REPOSITORIES: GEO

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Clr4/Suv39 and RNA quality control factors cooperate to trigger RNAi and suppress antisense RNA (expression)

Project description:Expression profile of Schizosaccharomyces pombe genome in ?mlo3, mlo3-A, mlo3-A?h2a.z, ?cid14?h2a.z and mlo3-A?cid14 cells. Expression profile of mutant cells compared to wild-type cells. Agilent 60mer oligonucleotide custom array containing probes spanning large portion of chromosome 2 at 50bp resolution was used to profile expression levels in mutant cells and to compare them to levels in wild-type cells.

2011-04-12 | E-GEOD-26995 | biostudies-arrayexpress

Clr4/Suv39 and RNA quality control factors cooperate to trigger RNAi and suppress antisense RNA (ChIP)

Project description:Occupancy profiling of Mlo3 in wild type and clr4∆ fission yeast Schizosaccharomyces pombe Agilent 60mer array was used to analyze DNA recovered by immunoprecipitation of Mlo3-Flag from asynchronous culture of fission yeast.

2011-04-12 | E-GEOD-26997 | biostudies-arrayexpress

Clr4/Suv39 and RNA quality control factors cooperate to trigger RNAi and suppress antisense RNA (ChIP)

Project description:Occupancy profiling of Mlo3 in wild type and clr4∆ fission yeast Schizosaccharomyces pombe

2011-04-12 | GSE26997 | GEO

Clr4/Suv39 and RNA quality control factors cooperate to trigger RNAi and suppress antisense RNA.

Project description:Pervasive transcription of eukaryotic genomes generates a plethora of noncoding RNAs. In fission yeast, the heterochromatin factor Clr4/Suv39 methyltransferase facilitates RNA interference (RNAi)-mediated processing of centromeric transcripts into small interfering RNAs (siRNAs). Clr4 also mediates degradation of antisense RNAs at euchromatic loci, but the underlying mechanism has remained elusive. We show that Clr4 and the RNAi effector RITS (RNA-induced transcriptional silencing) interact with Mlo3, a protein related to mRNA quality control and export factors. Loss of Clr4 impairs RITS interaction with Mlo3, which is required for centromeric siRNA production and antisense suppression. Mlo3 also interacts with the RNA surveillance factor TRAMP, which suppresses antisense RNAs targeted by Clr4 and RNAi. These findings link Clr4 to RNA quality control machinery and suggest a pathway for processing potentially deleterious RNAs through the coordinated actions of RNAi and other RNA processing activities.

| S-EPMC6309853 | biostudies-literature

Clr4/Suv39 and RNA quality control factors cooperate to trigger RNAi and suppress antisense RNA

Project description:This SuperSeries is composed of the SubSeries listed below. Refer to individual Series

2011-04-12 | E-GEOD-26999 | biostudies-arrayexpress

Clr4/Suv39 and RNA quality control factors cooperate to trigger RNAi and suppress antisense RNA

Project description:This SuperSeries is composed of the SubSeries listed below.

2011-04-12 | GSE26999 | GEO

Histone H2A.Z cooperates with RNAi and heterochromatin factors to suppress antisense RNAs

2009-08-25 | GSE17271 | GEO

Histone H2A.Z cooperates with RNAi and heterochromatin factors to suppress antisense RNAs

Project description:Expression profile of mutant cells compared to wild-type cells: Expression profile of Schizosaccharomyces pombe genome in ∆pht1, ∆ago1, ∆clr4, rik1, ∆pht1rik1, ∆pht1∆ago1 and ∆pht1∆clr4 cells. Expression profile of Schizosaccharomyces pombe genome in ∆rrp6, ∆cid14, ∆swi6, ∆swr1, ∆set1, ∆pht1∆swi6 and ∆pht1∆set1 cells. Expression profile of Schizosaccharomyces pombe genome in ∆alp13, ∆cph1, ∆set2, clr6-1 and ∆cph1∆pht1 cells. Occupancy profiling: Occupancy profiling of RNA polymerase II, histone variant H2A.Z and ClrC subunit Rik1 in fission yeast Schizosaccharomyces pombe Occupancy profiling of histone variant H2A.Z in ∆msc1 cells. Agilent 60mer oligonucleotide custom array containing probes spanning large portion of chromosome 2 at 50bp resolution was used to profile expression levels in mutant cells and to compare them to levels in wild-type cells. Agilent 60mer array was used to analyze DNA recovered by immunoprecipitation of RNA polymerase II, H2A.Z or Rik1 from asynchronous culture of fission yeast. Agilent 60mer array was used to analyze DNA recovered by immunoprecipitation of histone H2A.Z from asynchronous culture of fission yeast.

2009-08-25 | E-GEOD-17271 | biostudies-arrayexpress

Phosphorylation of HP1/Swi6 relieves competition with Suv39/Clr4 on nucleosomes and enables H3K9 trimethyl spreading.

Project description:Heterochromatin formation in Schizosaccharomyces pombe requires the spreading of histone 3 (H3) Lysine 9 (K9) methylation (me) from nucleation centers by the H3K9 methylase, Suv39/Clr4, and the reader protein, HP1/Swi6. To accomplish this, Suv39/Clr4 and HP1/Swi6 have to associate with nucleosomes both nonspecifically, binding DNA and octamer surfaces and specifically, via recognition of methylated H3K9 by their respective chromodomains. However, how both proteins avoid competition for the same nucleosomes in this process is unclear. Here, we show that phosphorylation tunes the nucleosome affinity of HP1/Swi6 such that it preferentially partitions onto Suv39/Clr4’s trimethyl product rather than its unmethylated substrates. Preferential partitioning enables efficient conversion from di-to trimethylation on nucleosomes in vitro and H3K9me3 spreading in vivo. Together, our data suggests that phosphorylation of HP1/Swi6 creates a regime that relieves competition with the “read-write” mechanism of Suv39/Clr4 for productive heterochromatin spreading.

2024-12-02 | GSE271394 | GEO

Set1/COMPASS repels heterochromatin invasion at euchromatic sites by disrupting Suv39/Clr4 activity and nucleosome stability.

Project description:Protection of euchromatin from invasion by gene-repressive heterochromatin is critical for cellular health and viability. In addition to constitutive loci such as pericentromeres and subtelomeres, heterochromatin can be found interspersed in gene-rich euchromatin, where it regulates gene expression pertinent to cell fate. While heterochromatin and euchromatin are globally poised for mutual antagonism, the mechanisms underlying precise spatial encoding of heterochromatin containment within euchromatic sites remain opaque. We investigated ectopic heterochromatin invasion by manipulating the fission yeast mating type locus boundary using a single-cell spreading reporter system. We found that heterochromatin repulsion is locally encoded by Set1/COMPASS on certain actively transcribed genes and that this protective role is most prominent at heterochromatin islands, small domains interspersed in euchromatin that regulate cell fate specifiers. Sensitivity to invasion by heterochromatin, surprisingly, is not dependent on Set1 altering overall gene expression levels. Rather, the gene-protective effect is strictly dependent on Set1's catalytic activity. H3K4 methylation, the Set1 product, antagonizes spreading in two ways: directly inhibiting catalysis by Suv39/Clr4 and locally disrupting nucleosome stability. Taken together, these results describe a mechanism for spatial encoding of euchromatic signals that repel heterochromatin invasion.

| S-EPMC6938669 | biostudies-literature

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