SMCHD1 and Facioscapulohumeral dystrophy: Thus, how the different heterozygous mutations lead to these diseases affecting the muscle (FSHD) or formation of the nasal placode, migration of surrounding neural crest cells and projection of the gonadotrophin-releasing hormone neurons (BAMS) must be established together with the identification of biological processes (BPs) that depend on SMCHD1.