Cystinosis is an autosomal recessive disorder with an estimatedincidence of 1 case per 100,000 to 200,000 live births. Thegene for cystinosis, CTNS, was mapped to chromosome 17p13 in19951 and was isolated in 1998.2 In nephropathic cystinosis,free cystine accumulates continuously in lysosomes, eventuallyresulting in intracellular crystal formation throughout thebody. In a parallel fashion, the acquisition of clinical andbasic information about cystinosis over the past four decadeshas crystallized our understanding of the cause and treatmentof this previously enigmatic disease. Since therapy has provedextremely effective, early diagnosis and treatment are criticalaspects.
From the Heritable Disorders Branch, National Institute of Child Health and Human Development, Bethesda, Md. (W.A.G.); the Hayward Genetics Center, Tulane Health Sciences Center, New Orleans (J.G.T.); and the Department of Pediatrics, University of CaliforniaSan Diego, La Jolla (J.A.S.).
Address reprint requests to Dr. Gahl at 10 Center Dr., MSC 1830, Bldg. 10, Rm. 9S-241, National Institute of Child Health and Human Development, Bethesda, MD 20892-1830, or at bgahl@helix.nih.gov.
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