Distal Alternative Last Exons Localize mRNAs to Neural Projections
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Author(s)
Vidaki, Marina
Oliveira, Ruan
Olson, Sara
Zhan, Lijun
Wang, Eric T.
Graveley, Brenton R.
Swanson, Maurice S.
Taliaferro, Jefferson Matthew
Saxena, Tanvi
Gertler, Frank
Date Issued
February 2016
Journal
Molecular Cell
Publisher
Elsevier BV
Citation
Taliaferro, J. Matthew et al. “Distal Alternative Last Exons Localize mRNAs to Neural Projections.” Molecular Cell 61, 6 (March 2016): 821–833 © 2016 Elsevier Inc
Version
Author's final manuscript
Abstract
Spatial restriction of mRNA to distinct subcellular locations enables local regulation and synthesis of proteins. However, the organizing principles of mRNA localization remain poorly understood. Here we analyzed subcellular transcriptomes of neural projections and soma of primary mouse cortical neurons and two neuronal cell lines and found that alternative last exons (ALEs) often confer isoform-specific localization. Surprisingly, gene-distal ALE isoforms were four times more often localized to neurites than gene-proximal isoforms. Localized isoforms were induced during neuronal differentiation and enriched for motifs associated with muscleblind-like (Mbnl) family RNA-binding proteins. Depletion of Mbnl1 and/or Mbnl2 reduced localization of hundreds of transcripts, implicating Mbnls in localization of mRNAs to neurites. We provide evidence supporting a model in which the linkage between genomic position of ALEs and subcellular localization enables coordinated induction of localization-competent mRNA isoforms through a post-transcriptional regulatory program that is induced during differentiation and reversed in cellular reprogramming and cancer. Taliaferro et al. show that mRNA isoforms that contain gene-distal alternative last exons are preferentially localized to neurites. These isoforms are induced during neuronal differentiation, suggesting that a coordinated post-transcriptional program targets messages to neurites. Localization of many neuronal mRNAs depends on muscleblind proteins.
MIT Department
Massachusetts Institute of Technology. Department of Biology
Koch Institute for Integrative Cancer Research at MIT
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Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/J.MOLCEL.2016.01.020
