Perturbing RNA localization for functional study in neurons

Spatial RNA organization plays a pivotal role in diverse cellular processes and diseases, but the functional implications of spatial RNA localization remain underexplored. We present CRISPR-mediated transcriptome<underline>o</underline>rganization (CRISPR-TO) that harnesses RNA-guided, nuclease-dead dCas13 for programmable control of RNA localization in live cells. CRISPR-TO enables targeted localization of RNAs to diverse subcellular compartments, including p-bodies, stress granules, telomeres, and nuclear stress bodies, across cell types. In primary cortical neurons, we demonstrate that repositioned mRNAs undergo local translation along neurites and at neurite tips and co-transport with ribosomes, withβ-actin mRNA localization enhancing the formation of dynamic filopodial protrusions and inhibiting axonal regeneration. Furthermore, CRISPR-TO-enabled parallel screening in primary neurons identifiesStmn2mRNA localization as a driver of neurite outgrowth. By enabling large-scale perturbation of the spatial transcriptome, CRISPR-TO bridges a critical gap left by current sequencing and imaging technologies, offering a versatile platform for high-throughput functional interrogation of RNA localization in living cells and organisms.