Three additional rare forms of LQTS involve adapter proteins linking the cell membrane to the cytoskeleton, such as ANK2 (LQT4) for ankyrin 2, CAV3 (LQT9) for cavolin 3, and SNTA1 (LQT12) encoding syntrophin α1 [2, 6]. This evidence concerns the gene CAV3 and familial long QT syndrome.