Exon junction complex dependent mRNA localization is linked to centrosome organization during ciliogenesis.
Oh Sung KwonRahul MishraAdham SafieddineEmeline ColenoQuentin AlasseurMarion FaucourtIsabelle BarbosaEdouard BertrandNathalie SpasskyHervé Le HirPublished in: Nature communications (2021)
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.
Keyphrases
- induced apoptosis
- high throughput
- cell cycle arrest
- stem cells
- endothelial cells
- endoplasmic reticulum stress
- magnetic resonance
- oxidative stress
- signaling pathway
- computed tomography
- induced pluripotent stem cells
- magnetic resonance imaging
- single cell
- blood brain barrier
- bone marrow
- subarachnoid hemorrhage
- pluripotent stem cells
- cell therapy