Human Molecular Genetics, Vol 6, 1639-1646, Copyright © 1997 by Oxford University Press
M Hutton and J Hardy
The presenilin 1 and presenilin 2 genes have been identified as pathogenic
loci involved in the majority of early onset, autosomal dominant
Alzheimer's disease. A series of (predominantly) missense mutations have
been identified in the two genes which lead to disease. The presenilins are
probably eight transmembrane domain proteins with both termini in the
cytoplasmic compartment. They have a wide tissue distribution and are found
in the endoplasmic reticulum and early Golgi. The mechanism of pathogenesis
of the mutations is not clear although, both in patients and in in vitro
systems, the effects of presenilin mutations are reminiscent of the effects
of the pathogenic mutations in the amyloid precursor protein gene which
lead to increases in the amount of amyloid-beta42(43) being produced from
the metabolism of the amyloid protein precursor. Thus, the presenilin data
provide independent support for the amyloid cascade hypothesis of
Alzheimer's pathogenesis. Work on the Caenorhabditis elegans homologues of
the presenilins, spe-4 and sel-12, suggests that the presenilins may have a
more general and direct role in the processing and trafficking of
membrane-bound proteins and that, in part, the pathogenic mutations may
disrupt this role.
REVIEWS
The presenilins and Alzheimer's disease
Neurogenetics Laboratory, The Mayo Clinic Jacksonville, FL 32224, USA. hutton.michael@mayo.edu
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