Abstract: Dendritic spines are small protrusions along dendrites that contain most of the excitatory synapses in principal neurons, playing a crucial role in neuronal function by creating a compartmentalized environment for signal transduction. The plasticity of spine morphologies provides a tunable handle to regulate calcium signal dynamics, allowing rapid regulation of protein expression necessary to establish and maintain synapses (Cornejo et al., 2022). If excitatory inputs were to be located primarily on dendritic shafts, dendrites would frequently short-circuit, preventing voltage signals from propagating (Cornejo et al., 2022). It is thus not surprising that the structural plasticity of dendritic spines is closely linked to synaptic plasticity and memory formation (Berry and Nedivi, 2017). While comprehensive in vitro studies have been conducted, in vivo studies that directly tackle the mechanism of dendritic transport and translation in regulating spine plasticity spatiotemporally are limited.