Facioscapulohumeral Muscular Dystrophy 4, Digenic, also known as fshd4, is related to facioscapulohumeral muscular dystrophy 4. An important gene associated with Facioscapulohumeral Muscular Dystrophy 4, Digenic is DNMT3B (DNA Methyltransferase 3 Beta). Affiliated tissues include skeletal muscle, and related phenotypes are weakness of facial musculature and upper limb muscle weakness