Presenilin mutations line up along transmembrane alpha-helices.

Abstract excerpt

Presenilin 1 mutations are the major cause of autosomal dominant Alzheimer's disease. Here we present evidence that pathogenic mutations in putative transmembrane domains 1, 2, 3, 4 and 6 align along helical faces, thus supporting the view that these are indeed transmembrane domains, and suggesting that disruption of the alignment of these domains is responsible for the pathogenicity of the mutations.

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