Human Molecular Genetics, Vol 3, 1469-1475, Copyright © 1994 by Oxford University Press
RA Spritz
Albinism is a group of genetic disorders characterized by deficient
synthesis of melanin pigment. In oculocutaneous albinism (OCA) the pigment
deficiency involves the skin, hair, and eyes, whereas in ocular albinism
(OA) the defect involves principally the visual system. Type I
(tyrosinase-deficient) OCA results from deficient catalytic activity of
tyrosinase, which catalyzes at least three steps in the melanin
biosynthetic pathway. Type II (tyrosinase-positive) OCA results from
abnormalities of the 'P' polypeptide, which may be a melanosomal tyrosine
transporter. At least some forms of OA appear to represent mild
presentations of types I and II OCA. The causes of several other forms of
albinism have not yet been identified. Recent application of molecular
genetic techniques to the study of these disorders has led to greatly
improved knowledge of their molecular pathogenesis and relationships, and
paves the way to improved diagnosis, carrier detection and prenatal
diagnosis, and even to eventual treatment.
REVIEWS
Molecular genetics of oculocutaneous albinism
Department of Medical Genetics, University of Wisconsin, Madison 53706.
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