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An extremely rare, complex type of hereditary spastic paraplegia, with onset in infancy of pronounced leg spasticity (leading to the inability to walk independently), reduced visual acuity due to optic atrophy and distal wasting of the hands and feet due to an axonal demyelinating sensorimotor neuropathy. Caused by mutations in the TFG gene (3q12.2) encoding protein TFG, which is thought to play a role in ER microtubular architecture and function.
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