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Syndrome with characteristics of episodes of myoclonus. Renal disease is an inconsistent feature occuring in some but not all cases. Myoclonic jerks typically occur in the torso, upper and lower limbs and face. Some affected individuals develop seizures, peripheral neuropathy or sensorineural hearing loss. Where renal problems occur, an early sign is proteinuria. Age of onset and the clinical course may vary even among members of the same family. The syndrome is caused by mutations in the SCARB2 gene leading to production of an altered LIMP-2 protein that cannot get to the lysosome. As a result, the movement of beta-glucocerebrosidase to lysosomes is impaired. Inherited in an autosomal recessive pattern.
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