Exon junction complex dependent mRNA localization is linked to centrosome organization during ciliogenesis

Nat Commun. 2021 Mar 1;12(1):1351. doi: 10.1038/s41467-021-21590-w.

Abstract

Exon junction complexes (EJCs) mark untranslated spliced mRNAs and are crucial for the mRNA lifecycle. An imbalance in EJC dosage alters mouse neural stem cell (mNSC) division and is linked to human neurodevelopmental disorders. In quiescent mNSC and immortalized human retinal pigment epithelial (RPE1) cells, centrioles form a basal body for ciliogenesis. Here, we report that EJCs accumulate at basal bodies of mNSC or RPE1 cells and decline when these cells differentiate or resume growth. A high-throughput smFISH screen identifies two transcripts accumulating at centrosomes in quiescent cells, NIN and BICD2. In contrast to BICD2, the localization of NIN transcripts is EJC-dependent. NIN mRNA encodes a core component of centrosomes required for microtubule nucleation and anchoring. We find that EJC down-regulation impairs both pericentriolar material organization and ciliogenesis. An EJC-dependent mRNA trafficking towards centrosome and basal bodies might contribute to proper mNSC division and brain development.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Autoantigens / metabolism
  • Cell Cycle
  • Cell Cycle Proteins / metabolism
  • Cell Proliferation
  • Centrosome / metabolism*
  • Cilia / metabolism*
  • Cytoskeletal Proteins / metabolism
  • DEAD-box RNA Helicases / metabolism
  • Eukaryotic Initiation Factor-4A / metabolism
  • Exons / genetics*
  • Humans
  • Mice
  • Microtubule-Associated Proteins / metabolism
  • Microtubules / metabolism
  • Neural Stem Cells / metabolism
  • Nuclear Proteins / metabolism
  • Protein Biosynthesis
  • RNA Transport*
  • RNA, Messenger / metabolism*
  • RNA-Binding Proteins / metabolism

Substances

  • Autoantigens
  • BICD2 protein, human
  • Cell Cycle Proteins
  • Cytoskeletal Proteins
  • Microtubule-Associated Proteins
  • NIN protein, human
  • Nuclear Proteins
  • PCM1 protein, human
  • RBM8A protein, human
  • RNA, Messenger
  • RNA-Binding Proteins
  • Eukaryotic Initiation Factor-4A
  • EIF4A3 protein, human
  • DEAD-box RNA Helicases