HCN1 and epilepsy: The genes that encode ion channels and are relevant to epilepsy include SCN1A, SCN1B, SCN2A, SCN8A, KCNA1, KCNA2, KCNB1, KCNC1, KCNMA1, KCNQ2, KCNQ3, KCNT1, KCTD7, HCN1, CACAN1A, CACNA1H, GRIN1, GRIN2A, GRIN2B, GRIN2D, GABRA1, GABRB3, GABRG2, CHRNA2, CHRNA4, CHRNB2. In our study, 51.2% pathogenic or likely pathogenic variants were found in voltage-gated ion channels and 4.7% were found in ligand-gated ion channels.