CALM1 and familial long QT syndrome: Other very rare LQTS variants are related to kinase activities, such as AKAP9 (LQT11) encoding A-kinase anchoring protein 9 binding to regulatory subunit of PKA, CALM1 (LQT14), and CALM2 (LQT15) for calmodulin 1 and 2, calcium binding phosphorylase kinase delta [6].