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Abstract
Alzheimer disease (AD) is the most common form of dementia, affecting 5% of the population older than 65 years and 30% to 50% older than 80 years. Substantial progress was made identifying genes for rare forms of early-onset AD1-4 and this early success significantly contributed to biologic study of AD mechanisms and, more recently, multiple drug discovery approaches. Late-onset AD, the common form of the disease, has been more difficult to solve, with apolipoprotein E (APOE) being the only confirmed susceptibility locus.5 The combination of high-density genotyping methods, large well-characterized AD and control populations, and statistical methods to evaluate population stratification now provide the tools to identify additional genes contributing to AD risk.