GTR Home > Conditions/Phenotypes > Cystinosis

Summary

Excerpted from the GeneReview: Cystinosis
Nephropathic cystinosis in untreated children is characterized by renal tubular Fanconi syndrome, poor growth, hypophosphatemic rickets, impaired glomerular function resulting in complete glomerular failure, and accumulation of cystine crystals in almost all cells, leading to cellular destruction and tissue dysfunction. The typical untreated child has short stature, light complexion, rickets, and photophobia. Failure to thrive is generally noticed after approximately age six months; signs of renal tubular Fanconi syndrome (polyuria, polydipsia, dehydration, and acidosis) appear as early as age six months; corneal crystals can be present before age one year and are always present after age 16 months. Prior to the use of renal transplantation and cystine-depleting therapy, the life span in nephropathic cystinosis was no longer than ten years. With these therapies, affected individuals can survive at least into the mid-forties or fifties with satisfactory quality of life. Intermediate cystinosis is characterized by all the typical manifestations of nephropathic cystinosis, but onset is at a later age. Renal glomerular failure occurs in all untreated affected individuals, usually between ages 15 and 25 years. The non-nephropathic (ocular) form of cystinosis is characterized only by photophobia resulting from corneal cystine crystal accumulation.

Available tests

33 tests are in the database for this condition.

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Associated genes

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