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Science 16 September 1988:
Vol. 241. no. 4872, pp. 1507 - 1510
DOI: 10.1126/science.3420406
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Articles

Science, Vol 241, Issue 4872, 1507-1510
Copyright © 1988 by American Association for the Advancement of Science

articles

Absence of linkage of chromosome 21q21 markers to familial Alzheimer's disease

GD Schellenberg, TD Bird, EM Wijsman, DK Moore, M Boehnke, EM Bryant, TH Lampe, D Nochlin, SM Sumi, SS Deeb, and al. et

Division of Neurology, University of Washington, Seattle 98195.

Alzheimer's disease is the most common form of dementia among the elderly population. Although the etiology is unknown, inheritance plays a role in the pathogenesis of the disease. Recent work indicates that an autosomal dominant gene for Alzheimer's disease is located on chromosome 21 at band q21. In the present study of a group of autopsy-documented kindreds, no evidence for linkage was found between familial Alzheimer's disease (FAD) and chromosome 21q21 markers (D21S1/D21S72 and the amyloid beta gene). Linkage to the D21S1/D21S72 locus was excluded at recombination fractions (theta) up to 0.17. Linkage to the amyloid gene was excluded at theta = 0.10. Apparent recombinants were noted in two families for the amyloid gene and in five families for the D21S1/D21S72 locus. These data indicate that FAD is genetically heterogeneous.


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