TTBK2 and ciliopathy: In motile cilia, phosphorylation of MPP9 by TTBK2 initiates a cascade of ubiquitination and degradation events required for ciliogenesis, yet the spatiotemporal regulation of this PTM crosstalk under disease conditions remains poorly understood.[31] Importantly, the functional consequences of TTBK2 activity exhibit significant context‐dependent variation across different ciliopathies.