EZH2 and Dravet syndrome: Mutations in KANSL1, EZH2 and SUZ12 were seen at the highest frequency, in 6.1–12.1%, 2.3–32.7% and 2–6.4% of ML-DS cases respectively (Nikolaev et al., 2013; Yoshida et al., 2013; Labuhn et al., 2019; Panferova et al., 2021).