Other subtypes of OCA include OCA type 2 (OCA2, MIM#203200) caused by mutations in the OCA2 gene (15q11.2–q12), OCA type 3 (OCA3, MIM#203290) associated with mutations in the tyrosinase-related protein gene (TYRP1, 9p23) and OCA type 4 (OCA4, MIM#606574) because of mutations in the membrane-associated transporter gene (MATP, 5p13.3) [3]. Here, TYRP1 is linked to oculocutaneous albinism.