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Abstract
Article abstract In a family with autopsy-confirmed Alzheimer disease, the authors found a mutation in the presenilin 2 (PS2) gene (PSEN2) that predicts a methionine-to-isoleucine change at PS2 residue 239 (M239I), at which a change to valine was known in another family. Phenotypic expression of M239I was highly variable, with disease onset between age 44 and 58 years, and two nonaffected mutation carriers at age 58 and 68 years. The data showed no influence of APOE but were compatible with other possible genetic modifiers of the phenotype or penetrance of M239I.
- Received June 25, 1999.
- Accepted in final form January 18, 2000.
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