Facioscapulohumeral muscular dystrophy (FSHD) is a skeletal muscular dystrophy characterized by DNA hypomethylation of D4Z4 repeat units of a macrosatellite array found at the distal end of chromosome region 4q35, which causes a myotoxic expression of DUX4. Researchers from Epic-Bio presented the discovery of EPI-321, a novel gene therapy candidate for the treatment of FSHD.