Human Molecular Genetics, Vol 6, 1535-1541, Copyright © 1997 by Oxford University Press
BT Lamb, LM Call, HH Slunt, KA Bardel, AM Lawler, CB Eckman, SG Younkin, G Holtz, SL Wagner, DL Price, SS Sisodia and JD Gearhart
Missense mutations in the beta-amyloid precursor protein gene (APP) co-
segregate with a small subset of autosomal dominant familial Alzheimer's
disease (FAD) cases wherein deposition of the 39-43 amino acid beta-amyloid
(A beta) peptide and neurodegeneration are principal neuropathological
hallmarks. To accurately examine the effect of missense mutations on APP
metabolism and A beta production in vivo, we have introduced yeast
artificial chromosomes (YACs) containing the entire approximately 400 kbp
human APP gene encoding APP harboring either the asparagine for lysine and
leucine for methionine FAD substitution at codons 670 and 671
(APP(K670N/M671L)), the isoleucine for valine FAD substitution at codon 717
(APP(V7171)) or a combination of both substitutions into transgenic mice.
We demonstrate that, relative to YAC transgenic mice expressing wild-type
APP, high levels of A beta peptides are detected in the brains of YAC
transgenic mice expressing human APP(K670N/M671L) that is associated with a
concomitant diminution in the levels of apha-secretase-generated soluble
APP derivatives. Moreover, the levels of longer A beta peptides (species
terminating at amino acids 42/43) are elevated in YAC transgenic mice
expressing human APP(V7171). These mice should prove valuable for detailed
analysis of the in vivo effects of the APP FAD mutations in a variety of
tissues and throughout aging and for testing therapeutic agents that
specifically alter APP metabolism and A beta production.
ARTICLES
Altered metabolism of familial Alzheimer's disease-linked amyloid precursor protein variants in yeast artificial chromosome transgenic mice
Department of Genetics, Case Western Reserve University, Cleveland, OH 44106, USA. btl@po.cwru.edu
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