Homozygous and biallelic variants in ANTXR1 have been associated with Growth retardation, Alopecia, Pseudoanodontia, and Optic atrophy (GAPO) syndrome, characterized by delayed growth, alopecia, failure of tooth eruption, and optic atrophy segregating as an AR trait [18,19,164]. This evidence concerns the gene ANTXR1 and alopecia.