Caused by mutation in the hamartin gene (TSC1, 605284.0001) [MOLECULAR BASIS] Genetic heterogeneity (see 613254) [MISCELLANEOUS] Prevalence of 1 in 6,000 to 1 in 10,000 [MISCELLANEOUS] Many studies have reported that the phenotype of tuberous sclerosis-1 (TSC1) is less severe than that of tuberous sclerosis-2 (i.e., higher IQ, less macules, fewer seizures) [MISCELLANEOUS] Highly variable phenotype [MISCELLANEOUS] Frequent new mutations (~86%) and/or gonadal mosaicism in TSC1 [MISCELLANEOUS] Majority of cases are sporadic [MISCELLANEOUS] One-third of cases are familial [MISCELLANEOUS]
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