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A rare complex type of hereditary spastic paraplegia with characteristics of early-onset progressive spastic paraplegia presenting in infancy. The disease is associated with optic atrophy, fixation nystagmus and polyneuropathy occurring in late childhood/early adolescence leading to severe motor disability and progressive joint contractures and scoliosis. Caused by mutations in the KLC2 gene (11q13.1), encoding kinesin light chain 2.
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