Adult onset, usually 30's to 40's, but up to early 60's [MISCELLANEOUS] Average disease duration of 7 years [MISCELLANEOUS] Caused by mutation in the prion protein gene (PRNP, 176640.0002) [MOLECULAR BASIS] Variable phenotype [MISCELLANEOUS] Rapidly progressive, but slower than Creutzfeldt-Jakob disease (123400) [MISCELLANEOUS] Longer disease duration than Creutzfeldt-Jakob disease [MISCELLANEOUS]
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