Preferential deposition of amyloid beta protein (Abeta) in the form Abeta40 in Alzheimer's disease is associated with a gene dosage effect of the apolipoprotein E E4 allele.

Abstract excerpt

The effect of apolipoprotein E (ApoE) genotype on the deposition of amyloid beta protein (Abeta) was examined in 54 patients with Alzheimer's disease. No difference in the amount of Abeta deposited as Abeta42(43) was seen between genotype groups with no, one or two E4 alleles. However, the amount of Abeta40 deposited increased according to the copy number of E4 alleles with patients possessing one E4 allele...

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