LIMK1 is a serine/threonine protein kinase containing LIM and PDZ domains that acts as a key regulator of actin cytoskeletal dynamics 1. Its primary function involves phosphorylating cofilin, an actin-depolymerization factor, thereby promoting F-actin accumulation and stabilization 1. LIMK1 integrates extracellular signals through Rac-GTP to modulate cytoskeletal reorganization, controlling cell morphology and mobility 1. In development, LIMK1 regulates trophoblast invasion and placental differentiation through HIF-2α-dependent mechanisms that modify cytoskeletal integrity and matrix metalloproteinase processing 2. Notably, LIMK1 is downregulated in preeclampsia, suggesting its importance in normal placentation 2. LIMK1 deletion contributes to neurological and behavioral phenotypes in Williams Syndrome, a 7q11.23 microdeletion disorder, with particular effects on visuospatial abilities 34. In Alzheimer's disease, the LIMK1-cofilin-actin axis shows dysregulation within dendritic spines, contributing to synaptic dysfunction and cognitive decline 5. Additionally, high LIMK1 expression promotes chemoresistance in colorectal cancer through m6A-regulated mechanisms affecting protein translation and stress responses 6. LIMK1 expression declines with oocyte aging, potentially impacting reproductive function 7.