這個基因的突變導致結節性硬化癥。其基因產物被認為是一種腫瘤抑制因子，能夠刺激特定的GTP酶。這種蛋白在細胞溶質復合體中與哈馬汀結合，可能作為哈馬汀的伴侶。選擇性剪接導致編碼不同亞型的多個轉錄變體。
Mutations in this gene lead to tuberous sclerosis complex. Its gene product is believed to be a tumor suppressor and is able to stimulate specific GTPases. The protein associates with hamartin in a cytosolic complex, possibly acting as a chaperone for hamartin. Alternative splicing results in multiple transcript variants encoding different isoforms.