The gene TMEM16A, also known as TMEM16 FLJ10261, ANO1, ORAOV2, and AOS2, which is located on chromosome 11q13.1, codes for the calcium-dependent chloride channel protein DOG1. DOG1 performs a number of essential roles, including controlling the cholinergic activity of gastrointestinal smooth muscle , and regulating cell survival and proliferation. In the identification of gastrointestinal stromal tumors (GIST), anti-DOG1 antibody has been proven to be helpful.