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The Cellular EJC Interactome Reveals Higher-Order mRNP Structure and an EJC-SR Protein Nexus

ABSTRACT: To uncover exon junction complex (EJC) deposition sites on cellular mRNAs, RNA footprints of EJC immuo-purified from HEK293 cells were deep sequenced. The analysis of these data revealed that major “canonical” EJC occupancy site in vivo lies 24 nucleotides upstream of exon junctions (-24 position) and that the majority of exon junctions carry an EJC. Unexpectedly, we find that many sites further upstream of -24 position are also enriched in these EJC footprints. These "non-canonical" sites are binding sites of EJC-interacting proteins with a subset being occupied by SR proteins. Thus, an EJC-SR protein nexus exists within spliced mRNPs and is revealed here.

ORGANISM(S): Homo sapiens

PROVIDER: GSE41154 | GEO | 2012/10/18

SECONDARY ACCESSION(S): PRJNA175949

REPOSITORIES: GEO

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The Cellular EJC Interactome Reveals Higher-Order mRNP Structure and an EJC-SR Protein Nexus

Project description:To uncover exon junction complex (EJC) deposition sites on cellular mRNAs, RNA footprints of EJC immuo-purified from HEK293 cells were deep sequenced. The analysis of these data revealed that major “canonical” EJC occupancy site in vivo lies 24 nucleotides upstream of exon junctions (-24 position) and that the majority of exon junctions carry an EJC. Unexpectedly, we find that many sites further upstream of -24 position are also enriched in these EJC footprints. These "non-canonical" sites are binding sites of EJC-interacting proteins with a subset being occupied by SR proteins. Thus, an EJC-SR protein nexus exists within spliced mRNPs and is revealed here. Deep sequencing based profiling of EJC RNA footprints obtained by tandem RNA immunoprecipitation (RIPiT) of RNase I digested RNA:protein complexes.

2012-10-18 | E-GEOD-41154 | biostudies-arrayexpress

Transcriptome-wide binding sites of mutually exclusive exon junction complexes

Project description:The exon junction complex (EJC) deposited upstream of mRNA exon junctions shapes structure, composition and fate of spliced mRNA ribonucleoprotein particles (mRNPs). To achieve this, the EJC core nucleates assembly of a dynamic shell of peripheral proteins that function in diverse post-transcriptional processes. In this study we show that EJC exists in two mutually exclusive compositions characterized by peripheral proteins RNPS1 and CASC3. We identified transcriptome-wide binding sites of the two alternate EJCs via RNA:protein immunoprecipitation in tandem followed by deep sequencing (RIPiT-Seq). We show that RNPS1-EJC, which is an SR-rich mega-dalton sized RNP, is the major EJC form in the nucleus. After mRNP export to the cytoplasm and before translation, the EJC undergoes a remarkable compositional and structural remodeling into an SR- and RNPS1-devoid monomeric complex that contains CASC3. The CASC3-EJC is enriched on cytoplasmic RNAs and is the main EJC form that encounters ribosome and undergoes disassembly during translation.

2018-11-19 | GSE115977 | GEO

Role of the Exon Junction Complex in Danio rerio

Project description:The exon junction complex (EJC) is composed of three core proteins Rbm8a, Magoh and Eif4a3 and is thought to play a role in several post-transcriptional processes. In this study we focus on understanding the role of EJC in zebrafish development. We identified transcriptome-wide binding sites of EJC in zebrafish via RNA:protein immunoprecipitation followed by deep sequencing (RIP-Seq). We find that, as in human cells, zebrafish EJC is deposited about 24 nts upstream of exon-exon junctions. We also identify transcripts regulated by Rbm8a and Magoh in zebrafish embryos using whole embryo RNA-seq from rbm8a mutant, magoh mutant and wild-type sibling embryos. This study shows that nonsense mediated mRNA decay is dysregulated in zebrafish EJC mutants.

2019-07-30 | GSE135019 | GEO

Widespread EJC footprints in the RNA degradome mark mRNA degradation before steady-state translation

Project description:Exon junction complexes (EJCs) are deposited to mRNAs during splicing and displaced from mRNAs by ribosomes in the pioneer round of translation. The understanding of EJC-bound mRNA degradation before steady-state translation has been limited to nonsense-mediated mRNA decay (NMD) due to a lack of suitable methodologies. Here, we show that RNA degradome data of Arabidopsis, rice, worm and human cells all exhibit a predominant accumulation of 5′ monophosphate (5′P) ends in the canonical EJC region. Inhibition of 5′-3′ exoribonuclease activity and overexpression of an EJC disassembly factor in Arabidopsis reduced the 5′P ends accumulating in the EJC region, supporting the notion that these 5′P ends are in vivo EJC footprints. Hundreds of Arabidopsis NMD targets possess evident EJC footprints, validating their degradation during the pioneer round of translation. In addition to premature termination codons, plant microRNAs can also direct the degradation of EJC-bound mRNAs. However, the production of EJC footprints from NMD but not microRNA targets is dependent on an NMD factor, SMG7. Together, our finding demonstrating in vivo EJC footprinting unravels the composition of the RNA degradome, and provides a new avenue for studying NMD and other mechanisms, such as microRNAs, targeting EJC-bound mRNAs for degradation before steady-state translation.

2020-02-02 | GSE118215 | GEO

Transcriptional profiling of EJC depletion by RNA-Seq using the SOLiD platform (Applied Biosystems)

Project description:Signaling pathways are controlled by a vast array of post-translational mechanisms. By contrast, little is known regarding the mechanisms that regulate the expression of their core components. We conducted an RNAi screen in Drosophila for factors modulating RAS/MAPK signaling and identified the Exon Junction Complex (EJC) as a novel key element of this pathway. The EJC binds the exon-exon junctions of mRNAs, and thus far, has been linked exclusively to post-splicing events. Here, we report that the EJC is required for proper splicing of mapk transcripts by a mechanism that apparently controls exon definition. Moreover, whole transcriptome and RT-PCR analyses of EJC-depleted cells revealed that the splicing of long intron-containing genes, which includes mapk, is sensitive to EJC activity. These results identify a role for the EJC in the splicing of a subset of transcripts and suggest that RAS/MAPK signaling depends on the regulation of MAPK levels by the EJC.

2010-10-20 | GSE24012 | GEO

Transcriptional profiling of EJC depletion by RNA-Seq using the SOLiD platform (Applied Biosystems)

2010-10-19 | E-GEOD-24012 | biostudies-arrayexpress

CLIP-seq of eIF4AIII reveals transcriptome-wide mapping of the human exon junction complex

Project description:The exon junction complex (EJC) is a central effector of mRNAs fate, linking nuclear processing to mRNA transport, translation and surveillance. Little is known about its transcriptome-wide targets. We used high-throughput sequencing after crosslinking and immunoprecipitation (HITS-CLIP) in human cells to identify the binding sites of the DEAD-box helicase eIF4AIII, an EJC core component. CLIP reads form peaks mainly located in spliced mRNAs. Most expressed exons harbour peaks equally distributed between the canonical EJC region ∼24 nucleotides upstream of exonic junctions and other non-canonical regions. Unexpectedly, both are preferentially associated to unstructured and purine-rich sequences containing the motif GAAGA, a potential binding site of EJC-associated factors. Therefore, EJC positions vary spatially and quantitatively between exons. This transcriptome-wide mapping of human eIF4AIII reveals unanticipated aspects of the EJC and broadens its potential impact on post-transcriptional regulation. To identify direct RNA binding sites of the EJC core component eIF4AIII, two biological CLIP-seq replicates were performed in HeLa cells. Additionally, mRNA-seq of the HeLa transcriptome was performed to normalize for the mRNA expression levels.

2012-10-21 | E-GEOD-40778 | biostudies-arrayexpress

mRNAseq of Drosophila S2 cells after knockdown of EJC components

Project description:This study used Drosophila melanogaster S2 cells treated with siRNA against the EJC components mago or eIF4A3, or a non-targeting control siRNA (three samples per condition). mRNA-seq libraries were prepared from the samples and the data was used to examine 'RS-exons' - exons which reconstitute a 5' splice site when they are spliced to the upstream exon. In contrast to mammalian cells, RS-exons are not recursively spliced out from Drosophila transcripts after perturbation of the EJC.

2018-10-15 | E-MTAB-7271 | biostudies-arrayexpress

Insights into transcriptome surveillance and alternative splicing regulation by the EJC-associated splicing factor RNPS1

Project description:Alternative splicing of pre-mRNAs increases the potential for regulation and complexity of gene expression. The exon junction complex (EJC) and its associated splicing factor RNPS1 were recently shown to suppress mis-splicing resulting from the usage of cryptic and reconstituted 5’ and 3’ splice sites in the vicinity of the EJC. Here, we aimed to further investigate the mechanisms underlying splicing regulation by RNPS1. A transcriptome-wide analysis identified hundreds of splice events affected by the knockdown (KD) of RNPS1 in HeLa cells. These included alternative splice site usage as well as intron retention, exon skipping and inclusion. However, only a fraction of these RNPS1-dependent splice events was fully or partially rescued by the expression of the RNPS1 RRM. These results indicated that another domain of RNPS1 is involved in the regulation of the majority of splicing events. Deletion experiments revealed that the N-terminus and S-domain, and in particular the C-terminus of RNPS1 strongly regulate these events. Several splicing factors, including SR proteins and U1 snRNP components, were strongly reduced in the interactome of RNPS1 lacking the C terminus. We conclude that RNPS1 interacts with many splicing factors to direct the assembly of EJC-dependent and-independent splicing complexes.

2022-05-31 | PXD027251 | Pride

Magoh, Y14, eIF4AIII interactomes by TurboID proximity labelling provide no evidence for a canonical EJC in (almost) intron-less trypanosomatids

Project description:In metazoans, mRNA quality is tightly monitored from transcription to translation. A key role lies with the exon junction complex (EJC) that is placed upstream of the exon-exon junction after splicing. The EJC inner core is composed of Magoh, Y14, eIF4AIII and BTZ and the outer core of proteins involved in mRNA splicing (CWC22), export (Yra1), translation (PYM) and non-sense mediated decay (NMD, UPF1/2/3). The protozoan parasite Trypanosoma brucei encodes only two genes with introns, but all mRNAs are processed by trans-splicing. The presence of the three core EJC proteins and a potential BTZ homologue (Rbp25) in trypanosomes has been suggested as an adaptation of the EJC function to mark trans-spliced mRNAs. Here we explore the interactome of Magoh, Y14, eIF4AIII in T. brucei by TurboID proximity labelling.

2024-03-25 | PXD050946 | Pride

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