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Alzheimer's disease (AD) is a devastating neurodegenerative disorder of late life with complex inheritance. Mutations in three known genes lead to the rare early-onset autosomal dominant form of AD, while a common polymorphism (ε4) in the gene encoding apolipoprotein E ( APOE  ) is a risk factor for more typical late-onset (&gt;60 years) AD. A recent study concluded that there are up to four additional genes with an equal or greater contribution to the disease. We performed a 9 cM genome screen of 437 families with AD, the full National Institute of Mental Health (NIMH) sample, which has been carefully ascertained, evaluated and followed by our group over the last decade. Performing standard parametric and non-parametric linkage analyses, we observed a ‘highly significant’ linkage peak by Lander and Kruglyak criteria on chromosome 19q13, which probably represents  APOE . Twelve additional locations—on 1q23, 3p26, 4q32, 5p14, 6p21, 6q27, 9q22, 10q24, 11q25, 14q22, 15q26 and 21q22—met criteria for ‘suggestive’ linkage [i.e. two-point lod score (TLS) ≥1.9 and/or multipoint lod score (MLS) ≥2.2] in at least one of our analyses. Although some of these will surely prove to be false positives, these linkage signals should provide a valuable framework for future studies aimed at identifying additional susceptibility genes for late-onset AD.

Results of a high-resolution genome screen of 437 Alzheimer's Disease families