SACK1H and amelogenesis imperfecta, type 3A: The genetic etiology of human autosomal dominant hypocalcified AI (ADHCAI, OMIM *130900) had been long sought, but remained unknown until mutations in a previously uncharacterized gene, FAM83H (family with sequence similarity 83, member H; OMIM *611927), were first identified through a genome‐wide search (Mendoza et al.