Clinical Chemistry
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Clinical Chemistry 39: 380-385, 1993;
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Clinical Chemistry, Vol 39, 380-385, Copyright © 1993 by American Association for Clinical Chemistry

Application of simple chromatographic methods for the diagnosis of defects in pyrimidine degradation

AH van Gennip, S Busch, L Elzinga, AE Stroomer, A van Cruchten, EG Scholten and NG Abeling
Academic Medical Center, Division of Pediatrics, Amsterdam, The Netherlands.

Recent findings suggest that inborn errors of pyrimidine catabolism are less rare than generally assumed. We propose a complete set of diagnostic methods for these disorders, suitable for the clinical chemistry laboratory, and present relevant reference data. Applications of thin-layer chromatography, high-performance liquid chromatography, and conventional cation-exchange amino acid analysis lead to detection of various defects in pyrimidine degradation, including the recently described deficiencies of dihydropyrimidine dehydrogenase and dihydropyrimidinase. We also illustrate the potential of the methods to analyze for the catabolites expected to be increased in the urine of patients with ureidopropionase deficiency. Possible pitfalls in the diagnosis and ways to prevent misdiagnosis are demonstrated. The methods offer possibilities for clinical chemistry laboratories to extend their diagnostic capacity to the new area of pyrimidine degradation defects.


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