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Mol Cell. 2016 Mar 17;61(6):821-33. doi: 10.1016/j.molcel.2016.01.020. Epub 2016 Feb 18.

Distal Alternative Last Exons Localize mRNAs to Neural Projections.

Author information

1
Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02142, USA.
2
Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02142, USA.
3
Department of Molecular Genetics and Microbiology, University of Florida College of Medicine, Gainesville, FL 32610, USA.
4
Department of Genetics and Genome Sciences, Institute for Systems Genomics, University of Connecticut Health Center, Farmington, CT 06030, USA.
5
Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02142, USA; Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02142, USA.
6
Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02142, USA. Electronic address: cburge@mit.edu.

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.

PMID:
26907613
PMCID:
PMC4798900
DOI:
10.1016/j.molcel.2016.01.020
[Indexed for MEDLINE]
Free PMC Article

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