Genetically predicted body mass index and Alzheimer's disease related phenotypes in three large samples: Mendelian randomization analyses

TitleGenetically predicted body mass index and Alzheimer's disease related phenotypes in three large samples: Mendelian randomization analyses
Publication TypeJournal Article
Year of Publication2015
AuthorsMukherjee, S, Walter, S, Kauwe, JSK, Saykin, AJ, Bennett, DA, Larson, EB, Crane, PK, Glymour, MM
JournalAlzheimer's and Dementia
Volume11
Issue12
KeywordsGenetics, Health Conditions and Status
Abstract

Observational research shows that higher body mass index (BMI) increases Alzheimer's disease (AD) risk, but it is unclear whether this association is causal. We applied genetic variants that predict BMI in Mendelian randomization analyses, an approach that is not biased by reverse causation or confounding, to evaluate whether higher BMI increases AD risk. We evaluated individual-level data from the AD Genetics Consortium (ADGC: 10,079 AD cases and 9613 controls), the Health and Retirement Study (HRS: 8403 participants with algorithm-predicted dementia status), and published associations from the Genetic and Environmental Risk for AD consortium (GERAD1: 3177 AD cases and 7277 controls). No evidence from individual single-nucleotide polymorphisms or polygenic scores indicated BMI increased AD risk. Mendelian randomization effect estimates per BMI point (95 confidence intervals) were as follows: ADGC, odds ratio (OR) = 0.95 (0.90 1.01); HRS, OR = 1.00 (0.75 1.32); GERAD1, OR = 0.96 (0.87 1.07). One subscore (cellular processes not otherwise specified) unexpectedly predicted lower AD risk.

URLhttp://www.sciencedirect.com/science/article/pii/S1552526015001843
DOI10.1016/j.jalz.2015.05.015
Endnote Keywords

Obesity/Dementia/Alzheimers disease/Mendelian randomization

Endnote ID

999999

Citation Key8227
PubMed ID26079416
PubMed Central IDPMC4676945