Association of Body Mass Index and Parkinson Disease: A Bidirectional Mendelian Randomization Study
- PMID: 38986057
- PMCID: PMC11759940
- DOI: 10.1212/WNL.0000000000209620
Association of Body Mass Index and Parkinson Disease: A Bidirectional Mendelian Randomization Study
Abstract
Background and objectives: The role of body mass index (BMI) in Parkinson disease (PD) is unclear. Based on the Comprehensive Unbiased Risk Factor Assessment for Genetics and Environment in PD (Courage-PD) consortium, we used 2-sample Mendelian randomization (MR) to replicate a previously reported inverse association of genetically predicted BMI with PD and investigated whether findings were robust in analyses addressing the potential for survival and incidence-prevalence biases. We also examined whether the BMI-PD relation is bidirectional by performing a reverse MR.
Methods: We used summary statistics from a genome-wide association study (GWAS) to extract the association of 501 single-nucleotide polymorphisms (SNPs) with BMI and from the Courage-PD and international Parkinson Disease Genomics Consortium (iPDGC) to estimate their association with PD. Analyses are based on participants of European ancestry. We used the inverse-weighted method to compute odds ratios (ORIVW per 4.8 kg/m2 [95% CI]) of PD and additional pleiotropy robust methods. We performed analyses stratified by age, disease duration, and sex. For reverse MR, we used SNPs associated with PD from 2 iPDGC GWAS to assess the effect of genetic liability toward PD on BMI.
Results: Summary statistics for BMI are based on 806,834 participants (54% women). Summary statistics for PD are based on 8,919 (40% women) cases and 7,600 (55% women) controls from Courage-PD, and 19,438 (38% women) cases and 24,388 (51% women) controls from iPDGC. In Courage-PD, we found an inverse association between genetically predicted BMI and PD (ORIVW 0.82 [0.70-0.97], p = 0.012) without evidence for pleiotropy. This association tended to be stronger in younger participants (≤67 years, ORIVW 0.71 [0.55-0.92]) and cases with shorter disease duration (≤7 years, ORIVW 0.75 [0.62-0.91]). In pooled Courage-PD + iPDGC analyses, the association was stronger in women (ORIVW 0.85 [0.74-0.99], p = 0.032) than men (ORIVW 0.92 [0.80-1.04], p = 0.18), but the interaction was not statistically significant (p-interaction = 0.48). In reverse MR, there was evidence for pleiotropy, but pleiotropy robust methods showed a significant inverse association.
Discussion: Using an independent data set (Courage-PD), we replicate an inverse association of genetically predicted BMI with PD, not explained by survival or incidence-prevalence biases. Moreover, reverse MR analyses support an inverse association between genetic liability toward PD and BMI, in favor of a bidirectional relation.
Conflict of interest statement
C. Domenighetti has received a doctoral grant from Université Paris-Saclay, France. P. May has received funding from the Fonds National de Recherche (FNR), Luxembourg, as part of the National Centre of Excellence in Research on Parkinson's Disease (NCER-PD, FNR11264123), the DFG Research Units FOR2715 (INTER/DFG/17/11583046), and FOR2488 (INTER/DFG/19/14429377). A.B. Singleton has received funding from the Intramural Research Program of the National Institute on Aging, National Institutes of Health, Department of Health and Human Services, project ZO1 AG000949, has received grants from the Department of Defense during the conduct of the study, has received grants from the Michael J. Fox Foundation outside the submitted work, and is an unpaid Scientific Advisory Board member for Cajal Neuroscience outside of the submitted work. D.G. Hernandez and C. Edsall have received funding from the Intramural Research Program of the National Institute on Aging, National Institutes of Health, Department of Health and Human Services, project ZO1 AG000949. W. Pirker has received personal fees from Grünenthal, AbbVie, AOP Health Orphan, Zambon, Boehringer Ingelheim, Stada, and Bial UCB Pharma. E. Rogaeva has received funding from the Canadian Consortium on Neurodegeneration in Aging. A.E. Lang has received personal fees from AbbVie, AFFiRis, Janssen, Biogen, Merck, Sun Pharma, Corticobasal Solutions, Sunovion, Paladin, Lilly, Medtronic, Theravance, Lundbeck, Retrophin, Roche, PhotoPharmics. S. Koks has received funding from MSWA. P. Taba has received Estonian Research Council Grant PRG957. A. Brice has received grants from France Parkinson, FRC, ANR—EPIG—Agence nationale de recherche, ANR—JPND—Agence nationale de recherche, RDS (Roger de Spoelberch Foundation), France Alzheimer, and Institut de France, ANR—EPIG, FMR (maladies rares). J.C. Corvol has received grants from the Michael J. Fox Foundation and Sanofi, and has served on advisory boards for Air Liquide, Biogen, Denali, Ever Pharma, Idorsia, Prevail Therapeutic, Theranexus, and UCB, outside the submitted work. K. Brockmann has received research funding from the Michael J. Fox Foundation for Parkinson's Research (MJFF-022343, MJFF-023275, MJFF-023365), the German Society for Parkinson DPG, the Health Forum Baden Wuerttemberg, the Else Kröner Fresenius Stiftung (ClinbrAIn), the University of Tuebingen, and the German Research Foundation DFG (BR-655671-1). K. Brockmann is a consultant for F. Hoffmann-La Roche Ltd., Vanqua Bio, and the Michael J. Fox Foundation for Parkinson's Research, and has received speaker honoraria from Abbvie, Lundbeck, UCB, and Zambon. L. Stefanis has received the following grants: PPMI2 (supported by the Michael J. Fox Foundation), IMPRIND-IMI2 Number 116060 (EU, H2020), “Transferring autonomous and non-autonomous cell degeneration 3D models between EU and USA for development of effective therapies for neurodegenerative diseases (ND)—CROSS NEUROD” (H2020-EU 1.3.3., grant number 778003), «Chaperone-Mediated Autophagy in Neurodegeneration» (Hellenic Foundation for Research and Innovation Grant HFRI-FM17-3013), and “CMA as a Means to Counteract alpha-Synuclein Pathology in Non-Human Primates” grant by the Michael J. Fox Foundation (collaborator), is co-Head and PI at the NKUA of the General Secretariat of Research and Technology (GSRT)-funded Grant “National Network of Precision Medicine for Neurodegenerative Diseases,” has served on an Advisory Board for Abbvie, ITF Hellas, and Biogen and has received honoraria from Abbvie and Sanofi. E.M. Valente serves as an associate editor of
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References
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- Rahmani J, Roudsari AH, Bawadi H, et al. Body mass index and risk of Parkinson, Alzheimer, Dementia, and Dementia mortality: a systematic review and dose-response meta-analysis of cohort studies among 5 million participants. Nutr Neurosci. 2022;25(3):423-431. doi: 10.1080/1028415X.2020.1758888 - DOI - PubMed
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