Caused by mutation in the ATP-binding cassette, subfamily D, member 1 gene (ABCD1, 300371.0001) [MOLECULAR BASIS] Highly variable phenotype, ranging from asymptomatic to death by age 3 years [MISCELLANEOUS] Onset ranges from childhood (severe phenotype) to adulthood (limited phenotype) [MISCELLANEOUS] Heterozygous female carriers may manifest symptoms [MISCELLANEOUS] Estimated incidence of 1 in 17,000 [MISCELLANEOUS] Progressive disorder [MISCELLANEOUS]
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