SHTN1 (shootin1) is a cytoskeletal regulator essential for neuronal polarization and axon guidance. It mediates netrin-1-induced actin-substrate coupling in axonal growth cones through CDC42, RAC1, and PAK1-dependent signaling 1, converting actin retrograde flow into traction forces that drive axon outgrowth and filopodium extension. SHTN1 contains a noncanonical WH2 actin-binding domain and proline-rich region whose activity is intrinsically inhibited by an N-terminal coiled-coil domain (CCD), with alternative splicing producing long (SHTN1L) and short (SHTN1S) isoforms that differentially interact with actin 2. In cortical development, SHTN1 cooperates with KIF20B to promote neuronal migration and the multipolar-to-bipolar transition. SHTN1 dysregulation associates with intellectual disability, where its downregulation correlates with impaired actin cytoskeletal and axonogenesis pathways 3. Beyond neurodevelopment, SHTN1's oligomerizing CCD-II domain mediates ligand-independent dimerization in FGFR2::SHTN1 fusion proteins, driving oncogenic transformation in cholangiocarcinoma and other malignancies 4. In bladder cancer, elevated SHTN1 expression correlates with poor prognosis and epithelial-mesenchymal transition, serving as an independent prognostic factor 5. SHTN1 also participates in endometrial receptivity regulation through PER2-dependent mechanisms affecting implantation success 6.