There is a rare autosomal dominant disorder called LQT7 which is characterized by ventricular arrhythmias, periodic paralysis, and distinctive skeletal and facial features.[1] In this case report, we identified a novel missense mutation of the KCNJ2 gene (NM_000891: c.224C > A, p.Thr75Lys) causing LQT7 and learning disability, without periodic paralysis, or distinctive skeletal and facial features. Here, KCNJ2 is linked to periodic paralysis.