Some features are variable, even within families [MISCELLANEOUS] Neurologic signs onset during adolescence or young adulthood [MISCELLANEOUS] Ophthalmologic signs onset in first to sixth decade [MISCELLANEOUS] Caused by mutation in the patatin-like phospholipase domain-containing protein 6 (PNPLA6, 603197.0004) [MOLECULAR BASIS] Some patients become wheelchair-bound [MISCELLANEOUS] Progressive disorder [MISCELLANEOUS]
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