Gene-Environment Interactions for Parkinson's Disease

Area of Science:

• Neurogenetics
• Environmental Epidemiology

Background:

• Parkinson's disease (PD) etiology is complex, with numerous genetic and environmental factors implicated, yet much of the risk remains unexplained.
• Understanding gene-environment interactions is crucial for elucidating PD pathogenesis and identifying novel therapeutic targets.

Purpose of the Study:

• To investigate statistical interactions between genetic susceptibility factors and environmental/lifestyle exposures in Parkinson's disease.
• To analyze data from the 23andMe, Inc. research dataset to identify gene-environment interplay in PD risk.

Main Methods:

• Utilized a validated Parkinson's disease polygenic risk score and GBA gene variants.
• Examined interactions with seven lifestyle and environmental factors: BMI, type 2 diabetes (T2D), tobacco use, caffeine consumption, pesticide exposure, head injury, and physical activity (PA).

Main Results:

• Type 2 diabetes, higher BMI, caffeine consumption, and tobacco use were associated with lower PD odds.
• Head injury, pesticide exposure, GBA carrier status, and PD polygenic risk score were linked to higher PD odds; no significant association for PA.
• Significant interactions were found between PD polygenic risk and T2D, PA, BMI, and tobacco use, indicating genotype modifies environmental/lifestyle associations with PD.

Conclusions:

• Preliminary evidence suggests that genotype can modify the association between certain environmental and lifestyle factors and Parkinson's disease.
• These findings highlight the importance of considering gene-environment interactions in PD research and clinical practice.