A presenilin 1 mutation associated with familial frontotemporal dementia inhibits γ-secretase cleavage of APP and notch

A novel presenilin 1 mutation, insR352, associated with a frontal temporal dementia phenotype has been identified (E. A. Rogaeva et al., 2001, Neurology 57, 621-625). This mutation does not increase Abeta42 levels, but instead acts as dominant negative presenilin, decreasing amyloid 13 protein (Abeta) production by inhibiting gamma-secretase cleavage of the Abeta precursor. The distinct clinical phenotype associated with this mutation suggests that chronic partial inhibition of gamma-secretase activity may result in neurodegeneration. (C) 2002 Elsevier Science (USA).