Rif1 acts through Protein Phosphatase 1 and independent of replication timing to suppresses telomere extension in budding yeast
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA430235 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR6495980.fastq.gz | Fastqsanger.gz | |||
| SRR6495990.fastq.gz | Fastqsanger.gz | |||
| SRR6495981.fastq.gz | Fastqsanger.gz | |||
| SRR6495991.fastq.gz | Fastqsanger.gz | |||
| SRR6495982.fastq.gz | Fastqsanger.gz |
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Similar Datasets
Project description:The Rif1 protein negatively regulates telomeric TG repeat length in the budding yeast S. cerevisiae, but how it prevents telomere over-extension is unknown. Rif1 was recently shown to control DNA replication by acting as a Protein Phosphatase 1 (PP1)-targeting subunit. Therefore we investigated whether Rif1 controls telomere length by targeting PP1 activity. We find that a Rif1 mutant that cannot interact with PP1 causes a long-telomere phenotype, similar to that of rif1∆ cells. Compromised PP1 function also causes telomere extension. Tethering PP1 at a specific telomere partially substitutes for Rif1 in limiting TG repeat length, confirming the importance of PP1 in telomere length control. Ablating Rif1-PP1 interaction leads to precocious activation of telomere-proximal replication origins and aberrantly early telomere replication. However, we find that Rif1 still limits telomere length even if nearby replication origins are deleted, indicating that effects of Rif1 on telomere length are not mediated through replication timing. Instead we find that, even at a telomere created after DNA synthesis during a mitotic block, Rif1-PP1 interaction is required to suppress telomere lengthening and prevent inappropriate recruitment of Tel1 kinase. Overall, our results show that Rif1 controls telomere length by recruiting PP1 to directly suppress telomerase-mediated TG repeat lengthening.
2018-02-14 | GSE109241 | GEO
Project description:The budding yeast telomere binding protein Rif1 (Rap1-interacting factor 1) plays an evolutionarily conserved role in the control of DNA replication timing, which operates through an interaction with the PP1 phosphatase. Rif1-PP1 has been proposed to inhibit origin firing by reversing the phosphorylation of key targets involved in replication initiation. However, it is not yet known if Rif1 binds directly to the replication origins that it controls. Here we show that in unperturbed yeast cells Rif1 primarily regulates late-replicating telomere-proximal origins. Using Chromatin Endogenous Cleavage (ChEC)-seq, we find that Rif1 is robustly detected at many late-replicating origins that we identify as targets of its inhibitory action. Abrogation of Rif1 telomere binding, through mutation of its Rap1 binding module, leads to increased Rif1 binding and late origin inhibition elsewhere in the genome. Our results support a model whereby Rif1 inhibits replication initiation by binding directly at origins, most of which are near telomeres, where Rif1 is concentrated through its interaction with telomere-bound Rap1 protein.
2018-04-24 | GSE97953 | GEO
Project description:This experiment details ChIP sequencing to decipher the binding sites of the Rif1 protein in budding yeast. Rif1 binds most strongly to telomeres where its binding is mediated by Rap1. To reduce telomere binding and help reveal Rap1-independent binding sites, a truncation mutant of Rif1 lacking the Rap1 interaction domain was constructed and analysed. Binding was examined at various cell-cycle stages to elucidate the role of Rif1 in DNA replication and other chromosome transactions.
2018-12-31 | E-MTAB-6736 | biostudies-arrayexpress
Project description:Genomic locations of Myc-tagged budding yeast Rif1 (including wilt-type and designer mutants) were analysed by ChIP-Seq. Mutants tested were rif1-7A and rif1-7E, in which Ser/Thr residues in the cluster of SQ/TQ sites were mutated to Ala or Glu, respectively. The performance of RIF1-9V5 was also tested.
2023-11-19 | E-MTAB-13451 | biostudies-arrayexpress
Project description:Genomic locations of V5-tagged budding yeast Rif1 (including wilt-type and designer mutants) were analysed by ChIP-Seq. Mutants tested were rif1-7A and rif1-7E, in which Ser/Thr residues in the cluster of SQ/TQ sites were mutated to Ala or Glu, respectively. We also tested tested rif1-∆594, in which the C-terminal 594 amino acids were deleted.
2023-11-19 | E-MTAB-13452 | biostudies-arrayexpress
Project description:The Rif1 protein negatively regulates telomeric TG repeat length in the budding yeast Saccharomyces cerevisiae, but how it prevents telomere over-extension is unknown. Rif1 was recently shown to control DNA replication by acting as a Protein Phosphatase 1 (PP1)-targeting subunit. Therefore, we investigated whether Rif1 controls telomere length by targeting PP1 activity. We find that a Rif1 mutant defective for PP1 interaction causes a long-telomere phenotype, similar to that of rif1Δ cells. Tethering PP1 at a specific telomere partially substitutes for Rif1 in limiting TG repeat length, confirming the importance of PP1 in telomere length control. Ablating Rif1-PP1 interaction is known to cause precocious activation of telomere-proximal replication origins and aberrantly early telomere replication. However, we find that Rif1 still limits telomere length even if late replication is forced through deletion of nearby replication origins, indicating that Rif1 can control telomere length independent of replication timing. Moreover we find that, even at a de novo telomere created after DNA synthesis during a mitotic block, Rif1-PP1 interaction is required to suppress telomere lengthening and prevent inappropriate recruitment of Tel1 kinase. Overall, our results show that Rif1 controls telomere length by recruiting PP1 to directly suppress telomerase-mediated TG repeat lengthening.
| S-EPMC5934629 | biostudies-literature
Project description:Chromosomal DNA replication involves the coordinated activity of hundreds to thousands of replication origins. Individual replication origins are subject to epigenetic regulation of their activity during S-phase, resulting in differential efficiencies and timings of replication initiation during S-phase. This regulation is thought to involve chromatin structure and organization into timing domains with differential ability to recruit limiting replication factors. Rif1 has recently been identified as a genome-wide regulator of replication timing in fission yeast and in mammalian cells. However, previous studies in budding yeast have suggested that Rif1’s role in controlling replication timing may be limited to subtelomeric domains and derives from its established role in telomere length regulation. We have analyzed replication timing by analyzing BrdU incorporation genome-wide, and report that Rif1 regulates the timing of late/dormant replication origins throughout the S. cerevisiae genome. Analysis of pfa4∆ cells, which are defective in palmitoylation and membrane association of Rif1, suggests that replication timing regulation by Rif1 is independent of its role in localizing telomeres to the nuclear periphery. Intra-S checkpoint signaling is intact in rif1∆ cells, and checkpoint-defective mec1∆ cells do not comparably deregulate replication timing, together indicating that Rif1 regulates replication timing through a mechanism independent of this checkpoint. Our results indicate that the Rif1 mechanism regulates origin timing irrespective of proximity to a chromosome end, and suggest instead that telomere sequences merely provide abundant binding sites for proteins that recruit Rif1. Still, the abundance of Rif1 binding in telomeric domains may facilitate Rif1-mediated repression of non-telomeric origins that are more distal from centromeres. 4 samples BrdU-IP-seq in HU, 2 strains with 2-replicates each (strains:WT and rif1 delta)
2014-06-01 | E-GEOD-55155 | biostudies-arrayexpress
Project description:Chromosomal DNA replication involves the coordinated activity of hundreds to thousands of replication origins. Individual replication origins are subject to epigenetic regulation of their activity during S-phase, resulting in differential efficiencies and timings of replication initiation during S-phase. This regulation is thought to involve chromatin structure and organization into timing domains with differential ability to recruit limiting replication factors. Rif1 has recently been identified as a genome-wide regulator of replication timing in fission yeast and in mammalian cells. However, previous studies in budding yeast have suggested that Rif1’s role in controlling replication timing may be limited to subtelomeric domains and derives from its established role in telomere length regulation. We have analyzed replication timing by analyzing BrdU incorporation genome-wide, and report that Rif1 regulates the timing of late/dormant replication origins throughout the S. cerevisiae genome. Analysis of pfa4∆ cells, which are defective in palmitoylation and membrane association of Rif1, suggests that replication timing regulation by Rif1 is independent of its role in localizing telomeres to the nuclear periphery. Intra-S checkpoint signaling is intact in rif1∆ cells, and checkpoint-defective mec1∆ cells do not comparably deregulate replication timing, together indicating that Rif1 regulates replication timing through a mechanism independent of this checkpoint. Our results indicate that the Rif1 mechanism regulates origin timing irrespective of proximity to a chromosome end, and suggest instead that telomere sequences merely provide abundant binding sites for proteins that recruit Rif1. Still, the abundance of Rif1 binding in telomeric domains may facilitate Rif1-mediated repression of non-telomeric origins that are more distal from centromeres. 30 total samples: (6 samples - BrdU- HU arrest 45min with 2 replicates, strains: WT, rif1 delta, pfa4 delta) (12 samples -S-phase BrdU time course with 2 replicates at 25 and 35 min, strains: WT, rif1 delta, mec1_100) (12 samples - S-phase BrdU time course with 2 replicates at 25 and 35 min, strains: sml1 delta, sml1 delta rif1 delta, sml1 delta mec1 delta)
2014-06-01 | E-GEOD-55130 | biostudies-arrayexpress
Project description:ChIP-Seq analysis of Myc-tagged budding yeast Rif1
| PRJEB67557 | ENA
Project description:ChIP-Seq analysis of V5-tagged budding yeast Rif1
| PRJEB67558 | ENA