ABCA7 rare variants and Alzheimer disease risk

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Objective:To study the association between ABCA7 rare coding variants and Alzheimer disease (AD) in a case-control setting.Methods:We conducted a whole exome analysis among 484 French patients with early-onset AD and 590 ethnically matched controls.Results:After collapsing rare variants (minor allele frequency ≤1%), we detected an enrichment of ABCA7 loss of function (LOF) and predicted damaging missense variants in cases (odds ratio [OR] 3.40, 95% confidence interval [CI] 1.68–7.35, p = 0.0002). Performing a meta-analysis with previously published data, we found that in a combined sample of 1,256 patients and 1,347 controls from France and Belgium, the OR was 2.81 (95% CI 1.89–4.20, p = 3.60 × 10−7).Conclusions:These results confirm that ABCA7 LOF variants are enriched in patients with AD and extend this finding to predicted damaging missense variants.

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