Hair amino acids in cystinosis, homocystinuria, Fölling's disease and tyrosinosis.
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The management of end stage renal failure in cystinotic children is correlated with a longer survival, sometimes complicated with neurological abnormalities. Cranial computed tomography was performed in 10 patients and showed a significant atrophy; the pathogenesis of this damage remains unclear.
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Electron microscopic examination of a biopsy specimen of cystinotic lymph node demonstrated that cystine crystals were entirely intracellular, and that the majority, including those of the largest size, were enclosed by intact limiting membranes. Acid phosphatase activity was localized specifically at the periphery of the crystal profiles and the smallest crystal aggregates were contained in osmophilic dense bodies which had the appearance of progressively swollen lysosomes. The implications of the suggested lysosomal distribution of cystine are discussed.
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A fast method for the determination of tissue free cystine is shown. Its usefulness for free cystine assays in leucocytes and muscle biopsies is discussed. The use of muscle biopsy as a means of diagnosis is proposed.