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

Abstract : The exon junction complex (EJC) is a central effector of the fate of mRNAs, linking nuclear processing to mRNA transport, translation and surveillance. However, little is known about its transcriptome-wide targets. We used cross-linking and immunoprecipitation methods coupled to high-throughput sequencing (CLIP-seq) in human cells to identify the binding sites of the DEAD-box helicase eIF4AIII, an EJC core component. CLIP reads form peaks that are located mainly in spliced mRNAs. Most expressed exons harbor peaks either in the canonical EJC region, located ~24 nucleotides upstream of exonic junctions, or in other noncanonical regions. Notably, both of these types of peaks are preferentially associated with unstructured and purine-rich sequences containing the motif GAAGA, which is a potential binding site for 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.
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Contributor : Luc Paillard Connect in order to contact the contributor
Submitted on : Thursday, April 24, 2014 - 10:48:28 AM
Last modification on : Wednesday, March 30, 2022 - 2:35:00 PM

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Jérôme Saulière, Valentine Murigneux, Zhen Wang, Emélie Marquenet, Isabelle Barbosa, et al.. CLIP-seq of eIF4AIII reveals transcriptome-wide mapping of the human exon junction complex.. Nature Structural and Molecular Biology, Nature Publishing Group, 2012, 19 (11), pp.1124-31. ⟨10.1038/nsmb.2420⟩. ⟨hal-00982626⟩



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