Folliculin is a protein that plays a crucial role in cellular processes, particularly in the regulation of cell growth and division. It is encoded by the FLCN gene, which is associated with the development of certain tumors, including Birt-Hogg-Dubé syndrome. This syndrome is characterized by skin lesions, lung cysts, and an increased risk of kidney cancer. Research indicates that folliculin is involved in the mTOR signaling pathway, which is essential for cell metabolism and growth. By regulating this pathway, folliculin helps maintain normal cellular functions and prevents uncontrolled cell proliferation, which can lead to cancerous growths.