Two novel loci, COBL and SLC10A2, for Alzheimer's disease in African Americans.

Alzheimers Dement 2017 02 20;13(2):119-129. Epub 2016 Oct 20.

Department of Neurology, Boston University School of Medicine, Boston, MA, USA; Alzheimer's Disease and CTE Center, Boston University School of Medicine, Boston, MA, USA; Department of Medicine (Biomedical Genetics), Boston University School of Medicine, Boston, MA, USA; Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA; Department of Ophthalmology, Boston University School of Medicine, Boston, MA, USA; Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA.

Introduction: African Americans' (AAs) late-onset Alzheimer's disease (LOAD) genetic risk profile is incompletely understood. Including clinical covariates in genetic analyses using informed conditioning might improve study power.

Methods: We conducted a genome-wide association study (GWAS) in AAs employing informed conditioning in 1825 LOAD cases and 3784 cognitively normal controls. We derived a posterior liability conditioned on age, sex, diabetes status, current smoking status, educational attainment, and affection status, with parameters informed by external prevalence information. We assessed association between the posterior liability and a genome-wide set of single-nucleotide polymorphisms (SNPs), controlling for APOE and ABCA7, identified previously in a LOAD GWAS of AAs.

Results: Two SNPs at novel loci, rs112404845 (P = 3.8 × 10), upstream of COBL, and rs16961023 (P = 4.6 × 10), downstream of SLC10A2, obtained genome-wide significant evidence of association with the posterior liability.

Discussion: An informed conditioning approach can detect LOAD genetic associations in AAs not identified by traditional GWAS.

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http://dx.doi.org/10.1016/j.jalz.2016.09.002DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5318231PMC
February 2017
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