Variants in VRK1 have been segregated with motor neuron diseases including SMA phenotype, adult‐onset motor neuron disease, HMSN, and juvenile‐onset dHMN with or without pontocerebellar hypoplasia or microcephaly 7, 8, 9, 10, 11, 12, 13 (Table S1 and Fig. 4). The gene discussed is VRK1; the disease is microcephaly.