A recessive mutation in the APP gene with dominant-negative effect on amyloidogenesis by Di Fede Giuseppe, Catania Marcella, Morbin Michela, Rossi Giacomina, Suardi Silvia, Mazzoleni Giulia, Merlin Marco, Giovagnoli Anna Rita, Prioni Sara, Erbetta Alessandra, Falcone Chiara, Gobbi Marco, Colombo Laura, Bastone Antonio, Beeg Marten, Manzoni Claudia, Francescucci Bruna, Spagnoli Alberto, Cantù Laura, Del Favero Elena, Levy Efrat, Salmona Mario, Tagliavini Fabrizio in Science (New York, N.Y.) (2009). PubMed

Abstract

beta-Amyloid precursor protein (APP) mutations cause familial Alzheimer's disease with nearly complete penetrance. We found an APP mutation [alanine-673-->valine-673 (A673V)] that causes disease only in the homozygous state, whereas heterozygous carriers were unaffected, consistent with a recessive Mendelian trait of inheritance. The A673V mutation affected APP processing, resulting in enhanced beta-amyloid (Abeta) production and formation of amyloid fibrils in vitro. Co-incubation of mutated and wild-type peptides conferred instability on Abeta aggregates and inhibited amyloidogenesis and neurotoxicity. The highly amyloidogenic effect of the A673V mutation in the homozygous state and its anti-amyloidogenic effect in the heterozygous state account for the autosomal recessive pattern of inheritance and have implications for genetic screening and the potential treatment of Alzheimer's disease.

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