The Nuclear Exosome is Active and Important during Budding Yeast Meiosis
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ABSTRACT:
ORGANISM(S): Saccharomyces cerevisiae
SUBMITTER: Jonathan Houseley
PROVIDER: E-GEOD-60221 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
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Project description:Cryptic unstable transcripts (CUTs) are rapidly degraded by the nuclear exosome, however, the way they are recognized and targeted to the exosome is not fully understood. The recently identified Schizosaccharomyces pombe MTREC complex has been shown to promote degradation of meiotic mRNAs and regulatory ncRNAs. Here, we report that the MTREC complex is also the major nuclear exosome targeting complex for CUTs and unspliced mRNAs. MTREC complex specifically binds to CUTs, meiotic mRNAs and unspliced mRNA transcripts and targets these RNAs for degradation by the nuclear exosome, while the TRAMP complex has only a minor role in this process. The MTREC complex physically interacts with the nuclear exosome and with various RNA-binding and -processing complexes, coupling RNA processing to the RNA degradation machinery. Our study reveals the central role of the evolutionarily conserved MTREC complex in RNA quality control, and in the recognition and elimination of aberrant, cryptic transcripts. RNA sequencing of WT and mutant S.pombe strains, processed data is normalized to median non-intron containing gene-expression, no replicates
2015-05-22 | E-GEOD-64991 | biostudies-arrayexpress
Project description:We have analysed the activity of the nuclear exosome during meiosis by deletion of TRF4, which encodes a key component of the exosome targeting complex TRAMP. We find that TRAMP mutants produce high levels of CUTs during meiosis that are undetectable in wild-type cells, showing that the nuclear exosome remains functional for CUT degradation. Lack of TRAMP activity stabilises ~1600 CUTs in meiotic cells, which occupy 40% of the binding capacity of the nuclear cap binding complex (CBC).
2014-08-09 | GSE60221 | GEO
Project description:The yeast mRNA export adaptor Yra1 binds the Pcf11 subunit of cleavage-polyadenylation factor CF1A linking export to 3'-end formation. We found a surprising consequence of this interaction is that Yra1 influences cleavage-polyadenylation. Yra1 competes with the CF1A subunit, Clp1, for binding to Pcf11, and excess Yra1 inhibits 3' processing in vitro. Release of Yra1 at the 3' ends of genes coincides with recruitment of Clp1, and depletion of Yra1 enhances Clp1 recruitment within some genes. These results suggest that CF1A is not necessarily recruited as a complete unit, but instead Clp1 can be incorporated co-transcriptionally in a process regulated by Yra1. Yra1 depletion causes widespread changes in poly(A) site choice particularly at sites where the efficiency element is divergently positioned. We propose that one way Yra1 modulates cleavage-polyadenylation is by influencing co-transcriptional assembly of the CF1A/B 3' processing factor. Key Words: Yra1, cleavage-polyadenylation, mRNA export, Pcf11, Clp1, Sub2, alternative polyadenylation mRNA poly (A) sites were mapped by sequencing 3' ends in WT and Yra1-depleted cells using a GAL1-YRA1 mutant. RNA seq of mRNA 3' ends using Illumina platform.
2011-09-24 | E-GEOD-30703 | biostudies-arrayexpress
Project description:Nuclear RNA degradation pathways are highly conserved across eukaryotes and play important roles in RNA quality control. Key substrates for exosomal degradation include aberrant functional RNAs and cryptic unstable transcripts (CUTs). It has recently been reported that the nuclear exosome is inactivated during meiosis in budding yeast through degradation of the subunit Rrp6, leading to the stabilisation of a subset of meiotic unstable transcripts (MUTs) of unknown function. We have analysed the activity of the nuclear exosome during meiosis by deletion of TRF4, which encodes a key component of the exosome targeting complex TRAMP. We find that TRAMP mutants produce high levels of CUTs during meiosis which are undetectable in wild-type cells, suggesting that the nuclear exosome remains functional, and we further show that the meiotic exosome complex still contains Rrp6. Indeed Rrp6 over-expression is insufficient to suppress MUT transcripts, showing that the reduced amount of Rrp6 in meiotic cells does not directly cause MUT accumulation. Lack of TRAMP activity stabilises ~1600 CUTs in meiotic cells, which occupy 40% of the binding capacity of the nuclear cap binding complex (CBC). CBC mutants display defects in the formation of meiotic double strand breaks (DSBs), and we see similar defects in TRAMP mutants, suggesting that a key function of the nuclear exosome is to prevent saturation of the CBC complex by CUTs. Together, our results show that the nuclear exosome remains active in meiosis and has an important role in facilitating meiotic recombination.
2015-05-15 | PXD001239 | Pride
Project description:Nuclear RNA degradation pathways are highly conserved across eukaryotes and play important roles in RNA quality control. Key substrates for exosomal degradation include aberrant functional RNAs and cryptic unstable transcripts (CUTs). It has recently been reported that the nuclear exosome is inactivated during meiosis in budding yeast through degradation of the subunit Rrp6, leading to the stabilisation of a subset of meiotic unstable transcripts (MUTs) of unknown function. We have analysed the activity of the nuclear exosome during meiosis by deletion of TRF4, which encodes a key component of the exosome targeting complex TRAMP. We find that TRAMP mutants produce high levels of CUTs during meiosis which are undetectable in wild-type cells, suggesting that the nuclear exosome remains functional, and we further show that the meiotic exosome complex still contains Rrp6. Indeed Rrp6 over-expression is insufficient to suppress MUT transcripts, showing that the reduced amount of Rrp6 in meiotic cells does not directly cause MUT accumulation. Lack of TRAMP activity stabilises ~1600 CUTs in meiotic cells, which occupy 40% of the binding capacity of the nuclear cap binding complex (CBC). CBC mutants display defects in the formation of meiotic double strand breaks (DSBs), and we see similar defects in TRAMP mutants, suggesting that a key function of the nuclear exosome is to prevent saturation of the CBC complex by CUTs. Together, our results show that the nuclear exosome remains active in meiosis and has an important role in facilitating meiotic recombination.
2015-05-15 | PXD001223 | Pride
Project description:Cryptic unstable transcripts (CUTs) are rapidly degraded by the nuclear exosome, however, the way they are recognized and targeted to the exosome is not fully understood. The recently identified Schizosaccharomyces pombe MTREC complex has been shown to promote degradation of meiotic mRNAs and regulatory ncRNAs. Here, we report that the MTREC complex is also the major nuclear exosome targeting complex for CUTs and unspliced mRNAs. MTREC complex specifically binds to CUTs, meiotic mRNAs and unspliced mRNA transcripts and targets these RNAs for degradation by the nuclear exosome, while the TRAMP complex has only a minor role in this process. The MTREC complex physically interacts with the nuclear exosome and with various RNA-binding and -processing complexes, coupling RNA processing to the RNA degradation machinery. Our study reveals the central role of the evolutionarily conserved MTREC complex in RNA quality control, and in the recognition and elimination of aberrant, cryptic transcripts. All experiments were performed twice in biological replicates.
2015-05-22 | E-GEOD-64980 | biostudies-arrayexpress
Project description:Cryptic unstable transcripts (CUTs) are rapidly degraded by the nuclear exosome, however, the way they are recognized and targeted to the exosome is not fully understood. The recently identified Schizosaccharomyces pombe MTREC complex has been shown to promote degradation of meiotic mRNAs and regulatory ncRNAs. Here, we report that the MTREC complex is also the major nuclear exosome targeting complex for CUTs and unspliced mRNAs. MTREC complex specifically binds to CUTs, meiotic mRNAs and unspliced mRNA transcripts and targets these RNAs for degradation by the nuclear exosome, while the TRAMP complex has only a minor role in this process. The MTREC complex physically interacts with the nuclear exosome and with various RNA-binding and -processing complexes, coupling RNA processing to the RNA degradation machinery. Our study reveals the central role of the evolutionarily conserved MTREC complex in RNA quality control, and in the recognition and elimination of aberrant, cryptic transcripts. Genome-wide expression analysis of MTREC, Nuclear Exosome, TRAMP, Nrd complex members All experiments were performed twice in biological replicates, except that rmn1Δ and mmi1Δ mei4-P572 were perfomed once.
2015-05-22 | E-GEOD-64979 | biostudies-arrayexpress
Project description:Mutations in the IDH1 and IDH2 genes encoding isocitrate dehydrogenases are frequent in human glioblastomas1 and cytogenetically normal acute myeloid leukemias (AML)2. These alterations are gain-of-function mutations in that they drive the synthesis of the M-bM-^@M-^\oncometaboliteM-bM-^@M-^] R-2-hydroxyglutarate (2HG)3. It remains unclear how IDH1 and IDH2 mutations modify myeloid cell development and promote leukemogenesis. Here we report the characterization of conditional knock-in mice in which the most common IDH1 mutation, Idh1-R132H, is inserted into the endogenous murine Idh1 locus and is expressed in cells of the hematopoietic (Vav-KI) or more specifically in cells of the myeloid (LysM-KI) lineage. These mutants show increased numbers of early hematopoietic progenitors and develop splenomegaly and anemia with extramedullary hematopoiesis, suggesting a dysfunctional bone marrow niche. Furthermore, LysM-KI cells exhibit both hypermethylated histones and changes to DNA methylation similar to those observed in human IDH1/2-mutant AML. Thus, our study is the first to describe the generation of conditional Idh1-R132H-KI mice. Furthermore, our study is also the first report showing the induction of a leukemic DNA methylation signature in a modeled system and sheds light on the mechanistic links between IDH1 mutation and human AML. DNA methylation profiling in LSK cells from IDH1-R132H knock-in mice vs. control mice
2012-07-22 | E-GEOD-38687 | biostudies-arrayexpress
Project description:Cryptic unstable transcripts (CUTs) are rapidly degraded by the nuclear exosome, however, the way they are recognized and targeted to the exosome is not fully understood. The recently identified Schizosaccharomyces pombe MTREC complex has been shown to promote degradation of meiotic mRNAs and regulatory ncRNAs. Here, we report that the MTREC complex is also the major nuclear exosome targeting complex for CUTs and unspliced mRNAs. MTREC complex specifically binds to CUTs, meiotic mRNAs and unspliced mRNA transcripts and targets these RNAs for degradation by the nuclear exosome, while the TRAMP complex has only a minor role in this process. The MTREC complex physically interacts with the nuclear exosome and with various RNA-binding and -processing complexes, coupling RNA processing to the RNA degradation machinery. Our study reveals the central role of the evolutionarily conserved MTREC complex in RNA quality control, and in the recognition and elimination of aberrant, cryptic transcripts. Genome-wide expression analysis of MTREC, Nuclear Exosome, TRAMP, Nrd complex members
2015-05-22 | GSE64979 | GEO
Project description:This SuperSeries is composed of the following subset Series: GSE30703: Budding yeast mRNA poly( A) site mapping GSE30705: Budding yeast mRNA export and processing factor localization Refer to individual Series
2011-09-24 | E-GEOD-30706 | biostudies-arrayexpress