Sequencing of exons 16 and 17 of the beta-amyloid precursor protein gene reveals the beta-amyloid sequence to be normal in cases of the parkinson dementia complex of Guam.

Exons 16 and 17 of the beta-amyloid precursor protein gene has been sequenced in individuals with the amyotropic lateral sclerosis/Parkinson's dementia complex of Guam to test the hypothesis that this disease is an allelic variant of Alzheimer's disease and to test whether sequence differences within beta-amyloid in this population contributes to the non-deposition of this peptide in the disorder. The sequence was normal.