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. 2022 Apr;37(4):857-864.
doi: 10.1002/mds.28902. Epub 2022 Jan 8.

Dairy Intake and Parkinson's Disease: A Mendelian Randomization Study

Cloé Domenighetti  1 Pierre-Emmanuel Sugier  1 Ashwin Ashok Kumar Sreelatha  2 Claudia Schulte  3   4 Sandeep Grover  2 Océane Mohamed  1 Berta Portugal  1 Patrick May  5 Dheeraj R Bobbili  5 Milena Radivojkov-Blagojevic  6 Peter Lichtner  6 Andrew B Singleton  7   8 Dena G Hernandez  7 Connor Edsall  7 George D Mellick  9 Alexander Zimprich  10 Walter Pirker  11 Ekaterina Rogaeva  12 Anthony E Lang  12   13   14   15 Sulev Koks  16   17 Pille Taba  18   19 Suzanne Lesage  20 Alexis Brice  20 Jean-Christophe Corvol  20   21 Marie-Christine Chartier-Harlin  22 Eugénie Mutez  22 Kathrin Brockmann  3   4 Angela B Deutschländer  23   24   25 Georges M Hadjigeorgiou  26   27 Efthimos Dardiotis  26 Leonidas Stefanis  28   29 Athina Maria Simitsi  28 Enza Maria Valente  30   31 Simona Petrucci  32   33 Stefano Duga  34   35 Letizia Straniero  34 Anna Zecchinelli  36 Gianni Pezzoli  37 Laura Brighina  38   39 Carlo Ferrarese  38   39 Grazia Annesi  40 Andrea Quattrone  41 Monica Gagliardi  42 Hirotaka Matsuo  43 Yusuke Kawamura  43 Nobutaka Hattori  44 Kenya Nishioka  44 Sun Ju Chung  45 Yun Joong Kim  46 Pierre Kolber  47 Bart P C van de Warrenburg  48 Bastiaan R Bloem  48 Jan Aasly  49 Mathias Toft  50 Lasse Pihlstrøm  50 Leonor Correia Guedes  51   52 Joaquim J Ferreira  51   53 Soraya Bardien  54 Jonathan Carr  55 Eduardo Tolosa  56   57 Mario Ezquerra  58 Pau Pastor  59   60 Monica Diez-Fairen  59   60 Karin Wirdefeldt  61   62 Nancy L Pedersen  62 Caroline Ran  63 Andrea C Belin  63 Andreas Puschmann  64 Clara Hellberg  64 Carl E Clarke  65 Karen E Morrison  66 Manuela Tan  67 Dimitri Krainc  68 Lena F Burbulla  68   69   70   71 Matt J Farrer  72 Rejko Krüger  5   47   73   74 Thomas Gasser  3   4 Manu Sharma  2 Alexis Elbaz  1 Comprehensive Unbiased Risk Factor Assessment for Genetics and Environment in Parkinson's Disease (Courage-PD) Consortium
Affiliations

Dairy Intake and Parkinson's Disease: A Mendelian Randomization Study

Cloé Domenighetti et al. Mov Disord. 2022 Apr.

Abstract

Background: Previous prospective studies highlighted dairy intake as a risk factor for Parkinson's disease (PD), particularly in men. It is unclear whether this association is causal or explained by reverse causation or confounding.

Objective: The aim is to examine the association between genetically predicted dairy intake and PD using two-sample Mendelian randomization (MR).

Methods: We genotyped a well-established instrumental variable for dairy intake located in the lactase gene (rs4988235) within the Courage-PD consortium (23 studies; 9823 patients and 8376 controls of European ancestry).

Results: Based on a dominant model, there was an association between genetic predisposition toward higher dairy intake and PD (odds ratio [OR] per one serving per day = 1.70, 95% confidence interval = 1.12-2.60, P = 0.013) that was restricted to men (OR = 2.50 [1.37-4.56], P = 0.003; P-difference with women = 0.029).

Conclusions: Using MR, our findings provide further support for a causal relationship between dairy intake and higher PD risk, not biased by confounding or reverse causation. Further studies are needed to elucidate the underlying mechanisms. © 2022 International Parkinson and Movement Disorder Society.

Keywords: dairy intake; Parkinson's disease; Mendelian randomization.

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References

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