SLC45A2 gene, having a chromosomal location 5p13.2, encodes a membrane associated transporter protein (MATP). MATP is a transmembrane protein. It is present in the melanosomal membrane in the melanocytes. It maintains the osmotic potential by regulating the pH of the melanosomal lumen. Defects in the SLC45A2 gene causes oculocutaneous albinism type IV; OCA IV...