Caused by mutation in the alpha-L-iduronidase gene (IDUA, 252800.0004) [MOLECULAR BASIS] Diagnosis typically between age 10-20 years [MISCELLANEOUS] MPS1 types are distinguished clinically by age of onset and progression or by mutation(s) [MISCELLANEOUS] Onset of symptoms after age 5 [MISCELLANEOUS] Alpha-L-iduronidase activity is <1% for all forms of MPS1 [MISCELLANEOUS]
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