KAT6B and Bohring-Opitz syndrome: Chromatinopathies can be caused by mutations in genes in each category of the epigenetic machinery, including writers (i.e., Kabuki 1, Sotos, Kleefstra, Koolen-De-Vries/KANSL1 haploinsufficiency, Rubinstein-Taybi, KAT6B-related syndromes); readers (i.e., Smith-Magenis, Rett syndromes), erasers (i.e., Kabuki 2, Townes-Brock, Bohring-Opitz syndromes) and chromatin remodellors (i.e., ATRX, CHARGE, Floating-Harbor syndromes).