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• W2029563076 abstract "<h3>Importance</h3> Because<i>APOE</i>locus variants contribute to risk of late-onset Alzheimer disease (LOAD) and to differences in age at onset (AAO), it is important to know whether other established LOAD risk loci also affect AAO in affected participants. <h3>Objectives</h3> To investigate the effects of known Alzheimer disease risk loci in modifying AAO and to estimate their cumulative effect on AAO variation using data from genome-wide association studies in the Alzheimer Disease Genetics Consortium. <h3>Design, Setting, and Participants</h3> The Alzheimer Disease Genetics Consortium comprises 14 case-control, prospective, and family-based data sets with data on 9162 participants of white race/ethnicity with Alzheimer disease occurring after age 60 years who also had complete AAO information, gathered between 1989 and 2011 at multiple sites by participating studies. Data on genotyped or imputed single-nucleotide polymorphisms most significantly associated with risk at 10 confirmed LOAD loci were examined in linear modeling of AAO, and individual data set results were combined using a random-effects, inverse variance–weighted meta-analysis approach to determine whether they contribute to variation in AAO. Aggregate effects of all risk loci on AAO were examined in a burden analysis using genotype scores weighted by risk effect sizes. <h3>Main Outcomes and Measures</h3> Age at disease onset abstracted from medical records among participants with LOAD diagnosed per standard criteria. <h3>Results</h3> Analysis confirmed the association of<i>APOE</i>with earlier AAO (<i>P</i> = 3.3 × 10⁻⁹⁶), with associations in<i>CR1</i>(rs6701713,<i>P</i> = 7.2 × 10⁻⁴),<i>BIN1</i>(rs7561528,<i>P</i> = 4.8 × 10⁻⁴), and<i>PICALM</i>(rs561655,<i>P</i> = 2.2 × 10⁻³) reaching statistical significance (<i>P</i> < .005). Risk alleles individually reduced AAO by 3 to 6 months. Burden analyses demonstrated that<i>APOE</i>contributes to 3.7% of the variation in AAO (<i>R2</i> = 0.256) over baseline (<i>R2</i> = 0.221), whereas the other 9 loci together contribute to 2.2% of the variation (<i>R2</i> = 0.242). <h3>Conclusions and Relevance</h3> We confirmed an association of<i>APOE</i>(OMIM107741) variants with AAO among affected participants with LOAD and observed novel associations of<i>CR1</i>(OMIM 120620),<i>BIN1</i>(OMIM 601248), and<i>PICALM</i>(OMIM 603025) with AAO<i>.</i>In contrast to earlier hypothetical modeling, we show that the combined effects of Alzheimer disease risk variants on AAO are on the scale of, but do not exceed, the<i>APOE</i>effect. While the aggregate effects of risk loci on AAO may be significant, additional genetic contributions to AAO are individually likely to be small." @default.
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