Abstract
A 6-month-old infant presented with failure to thrive, hyperuricaemia and renal insufficiency. The hyperuricaemia was due to uric acid over-production. The level of hypoxanthine-guanine phosphoribosyltransferase (HGPRT) activity was found to be normal. However, a two-fold increase in the Km of the enzyme to hypoxanthine as well as in the Vmax values was observed. It seems therefore, that in cases of uric acid over-production, screening tests of HGPRT activity may be insufficient and additional kinetic properties of the enzyme should be tested.
Abbreviations
- HGPRT:
-
hypoxanthine-guanine phosphoribosyl transferase
- APRT:
-
adenine phosphoribosyl transferase
- FTT:
-
failure to thrive
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Kerem, E., Branski, D., Gross-Kieselstein, E. et al. Impaired kinetic properties of hypoxanthine-guanine phosphoribosyl transferase as a cause of uric acid nephropathy in early infancy. Eur J Pediatr 146, 595–597 (1987). https://doi.org/10.1007/BF02467362
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DOI: https://doi.org/10.1007/BF02467362