Profilin and Non-Canonical Wnt Signaling: Coordinating Cytoskeletal Dynamics from Development to Disease.

Vertebrate embryonic development relies on tightly regulated signaling pathways that guide morphogenesis, cell fate specification, and tissue organization. Among these, the Wnt signaling pathway plays a central role, orchestrating key developmental events. The non-canonical Wnt pathways, including the Planar Cell Polarity and Wnt/Ca branches, are especially critical for regulating cytoskeletal dynamics during gastrulation. Recent studies highlight that these pathways interface with cytoskeletal effectors to control actin remodeling in response to extracellular cues. One such effector is Profilin, a small, evolutionarily conserved actin-binding protein that modulates actin polymerization and cellular architecture. Profilins, particularly Profilin1 and 2, are known to interact with Daam1, a formin protein downstream of PCP signaling, thereby linking Wnt signals to actin cytoskeletal regulation. Emerging evidence suggests that Profilins are active signaling intermediates that contribute to morphogenetic processes. Their context-dependent interactions and differential expression across species also suggest that they play specialized roles in development and disease. This review synthesizes the current understanding of Profilin's role in non-canonical Wnt signaling, examining its molecular interactions and contributions to cytoskeletal control during development. By integrating data across model systems, we aim to clarify how Profilins function at the intersection of signaling and cytoskeletal dynamics, with implications for both developmental biology and disease pathogenesis.