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A rare form of hereditary spastic paraplegia with characteristics of delayed walking, toe walking, unsteady and spastic gait, hyperreflexia of the lower limbs, and extensor plantar responses. Upper limbs spasticity and dystonia, subclinical axonal neuropathy, cognitive impairment and intellectual disability have also been associated. Caused by homozygous or compound heterozygous mutation in the CYP2U1 gene on chromosome 4q25.
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