KCNK4 and Rolandic epilepsy: Two heterozygous missense variants (c.416G > A/ p.Gly139Glu and c.698C > T/p.Pro233Leu) in the KCNK4 gene were identified in two unrelated patients, including one with FHEIG syndrome and one with Rolandic epilepsy (Figures 1A,B; Table 1).