Short QT syndrome is a relatively recently-described cardiac channelopathy associated with a high risk of ventricular arrhythmia and sudden death (Priori et al., 2013), and mutations in KCNJ2 have recently been reported in patients with short QT syndrome and an autism–epilepsy phenotype (Ambrosini et al., 2014). The gene discussed is KCNJ2; the disease is autism.