Stargardt disease 1 (STGD1, OMIM #248200) is an autosomal recessive MD caused by homozygous or compound heterozygous variants in the ABCA4 gene (chromosome 1p22) and characterized by the atrophy of the retinal pigment epithelium (RPE) and the loss of photoreceptors. This evidence concerns the gene ABCA4 and Menkes disease.