KCTD7 and progressive myoclonus epilepsy: Moreover, potassium channel mutations also result in PME, the mutated genes being KCNC1, encoding potassium voltage-gated channel subfamily C member 1, and KCTD7, which encodes for potassium channel tetramerization domain containing 7 (Van Bogaert, 2016; Park et al., 2019).