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Nuclear stability and transcriptional directionality separate functionally distinct RNA species

ABSTRACT: Sequencing of 5' ends of RNA molecules from control and exosome-depleted HeLa-S3 cells.

ORGANISM(S): Homo sapiens

PROVIDER: GSE58991 | GEO | 2014/07/02

SECONDARY ACCESSION(S): PRJNA254060

REPOSITORIES: GEO

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Nuclear stability and transcriptional directionality separate functionally distinct RNA species

Project description:Sequencing of 5' ends of RNA molecules from control and exosome-depleted HeLa-S3 cells. CAGE library construction from RNA extracted from control and exosome-depleted cells.

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Nuclear stability and transcriptional directionality separate functionally distinct RNA species.

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The human cap-binding complex is functionally connected to the nuclear RNA exosome

Project description:Nuclear processing and quality control of eukaryotic RNA is mediated by the multi-subunit RNA exosome, which utilizes accessory factors to regulate its enzymatic activity. However, the mechanism of exosome recruitment to its ribonucleoprotein (RNP) targets remains poorly understood. Here we disclose a physical link between the human nuclear RNA exosome and the cap-binding complex (CBC). The CBC associates with the ARS2 protein to form CBC-ARS2 (CBCA), and then further connects together with the uncharacterized ZC3H18/NHN1 protein to the nuclear exosome targeting (NEXT) complex, forming CBC-NEXT (CBCN). RNA immunoprecipitation analysis using CBCN factors as baits as well as the combinatorial depletion of CBCN and exosome components underscore the functional relevance of CBC-exosome bridging at the level of target RNA. Specifically, CBCA suppresses read-through transcription of several RNA families by promoting their transcriptional termination. We suggest that the RNP 5M-bM-^@M-^Ycap links transcription termination to exosomal RNA degradation via CBCN. In total 10 samples; 4 control IP HeLa, 2 Flag- Ars2 IP, 2 Flag-CBP20 IP; and 2 GFP-RBM7 Ips. The signal intensity data was analyzed with the Affymetrix Tiling Analysis Software (v. 1.1) using parameters: one side upper, 90 bp bandwidth and perfect match only. Output txt files (i.e. result file). TASParam* files include parameter settings and input file information for the TAS analysis for each result file. The description of 'ProcessedDatas_TA.xls' file is provided in the 'README.txt'

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Distinct and redundant roles of nuclear RNA exosome targeting complexes

Project description:Degradation of transcripts in mammalian nuclei is primarily facilitated by the RNA exosome. To obtain substrate specificity, the exosome is aided by adaptors; in the nucleoplasm, the Nuclear EXosome Targeting (NEXT) complex and the PolyA (pA) eXsome Targeting (PAXT) connection. However, how exact targeting is achieved remains enigmatic. Employing high-resolution 3’end sequencing of both steady state and newly produced pA+ and pA- RNA, we demonstrate that NEXT substrates arise from heterogenous and predominantly pA- 3’ends often covering kb-wide genomic regions. In contrast, PAXT targets harbor well-defined pA+ 3’ends defined by canonical pA site usage. Irrespective this clear division, NEXT and PAXT act redundantly in two ways: i) Regional redundancy: The majority of exosome-targeted transcription units produce both NEXT- and PAXT-sensitive RNA isoforms; and ii) Isoform redundancy: The PAXT connection ensures the fail-safe decay of post-transcriptionally polyadenylated NEXT targets. In conjunction, this provides for the efficient nuclear removal of superfluous RNA.

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