Classic Lesch-Nyhan, < 1.5% hypoxanthine phosphoribosyltransferase (HPRT) activity [MISCELLANEOUS] Variant Lesch-Nyhan, 1.5-8% HPRT activity with neurologic abnormalities, but no self-injurious behavior [MISCELLANEOUS] Caused by mutation in the hypoxanthine phosphoribosyltransferase gene (HPRT1, 308000.0004) [MOLECULAR BASIS]
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