LIN7C (lin-7 cell polarity scaffold C) is a membrane-associated adaptor protein that plays a crucial role in maintaining cellular polarity and membrane organization. The protein functions as a component of multiprotein complexes that regulate the proper localization of channels, receptors, and transporters to specific membrane domains 1. LIN7C is particularly important in establishing tight junction integrity, as it directly contributes to urothelial barrier function and cellular polarity 2. The protein works in conjunction with other polarity proteins including Dlg1 and Scribble, where it can be indirectly recruited through Dlg1 interactions 3. In epithelial cells, LIN7C helps maintain proper cell-cell junctions and prevents epithelial-mesenchymal transition, with its downregulation promoting cell migration and EMT markers 4. The gene has clinical relevance, as variants near LIN7C have been associated with metabolic traits including obesity and type 2 diabetes risk 5, knee osteoarthritis development 6, and potentially schizophrenia-related cognitive dysfunction 7. Disruption of LIN7C function can compromise epithelial barrier integrity, contributing to pathological conditions such as bladder pain syndrome and cancer progression.