Åland Island eye disease (Forsius‐Eriksson ocular albinism) and an Xp21 deletion in a patient with duchenne muscular dystrophy, glycerol kinase deficiency, and congenital adrenal hypoplasia

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Abstract
Glycerol kinase deficiency (GKD) has been described in isolation and in complex phenotypes including either congenital adrenal hypoplasia, Duchenne muscular dystrophy, or both. Cytogenetic and molecular studies have localized these defects to a deletion in volving the X chromosome at band Xp21, consistent with its X‐linked recessive pattern of inheritance. Other clinical findings in the complex glycerol kinase deficiency (CGKD) patients are mental retardation, short stature, and hypogonadotropic hypogonadisem. We report on a 6‐year‐old boy who, in addition to the CGKD phenotype described above, had ocular hypopigmentation consistent with Forsius‐Eriksson ocular albinism, also known as type 2 ocular albinism or Åland Island eye disease. Cytogenetic analysis shows an interstitial deletion in the short arm of the X‐chromosome at Xp21.