Slowly progressive [MISCELLANEOUS] Nystagmus may disappear by mid-childhood [MISCELLANEOUS] Onset in infancy [MISCELLANEOUS] Connatal form (type II), most severe with death in first decade [MISCELLANEOUS] Spastic paraplegia 2 (SPG2, 312920) is an allelic disorder [MISCELLANEOUS] Hearing impairment may improve with age [MISCELLANEOUS] Classical form (type I), less severe with survival into adulthood [MISCELLANEOUS] Caused by mutation in the proteolipid protein 1 gene (PLP1, 300401.0001) [MOLECULAR BASIS]
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