As previously described in EMAtS, we identified pathogenic variants in SLC2A1 (n = 3), ANKRD11 (n = 2), GABRG2 (n = 2), CHD2 (n = 1), CSNK2B (n = 1), NEXMIF (n = 1) and POLR3B (n = 1) (Supplementary Table 1), although we found no pathogenic variants in SLC6A1, a gene commonly associated with EMAtS. Here, POLR3B is linked to epilepsy with myoclonic atonic seizures.