The CHCHD10 Gly66Val variant is commonly found in relatively mild motor neuron diseases, including late-onset spinal motor neuronopathy (spinal muscular atrophy Jokela type, SMAJ) (5, 28) and type 2 Charcot-Marie-Tooth disease (CMT2) (6), both prevalent in the Finnish population. This evidence concerns the gene CHCHD10 and motor neuron disorder.