The FLCN gene is a human gene located on chromosome 17. It provides instructions for producing a protein called folliculin, which plays a crucial role in regulating cell growth and energy metabolism. Mutations in the FLCN gene can lead to various health issues, including a rare genetic disorder known as Birt-Hogg-Dubé syndrome. Birt-Hogg-Dubé syndrome is characterized by skin tumors, lung cysts, and an increased risk of certain types of kidney cancer. Understanding the FLCN gene is important for diagnosing and managing these conditions, as well as for developing potential treatments that target the underlying genetic causes.