Polygenic scores contribution to Parkinson's disease comorbidities

Area of Science:

• Neurogenetics
• Complex disease genetics
• Parkinson's disease research

Background:

• Comorbidities are prevalent in Parkinson's disease (PD), influencing its progression and management.
• The role of genetic predisposition, assessed via polygenic scores, in PD comorbidities is not well understood.
• Investigating genetic risk for comorbidities can elucidate PD heterogeneity.

Purpose of the Study:

• To compare polygenic scores for common comorbidities between individuals with PD and the general population.
• To explore the influence of genetic risk on PD onset age and sex-specific differences.
• To determine if genetic predisposition to comorbidities modifies PD clinical presentation.

Main Methods:

• Analysis of UK Biobank data from 4144 PD patients and 370,480 controls.
• Calculation of polygenic scores for Type 2 diabetes, major depressive disorder, migraine, and epilepsy.
• Comparison of polygenic score distributions and association analyses with PD onset and sex.

Main Results:

• Polygenic scores for the studied comorbidities did not significantly differ between PD patients and controls.
• Earlier PD onset (50-70 years) was associated with higher genetic risk for major depressive disorder and epilepsy.
• Sex-specific associations were observed: higher genetic risk for major depressive disorder and migraine in females, and for Type 2 diabetes in males with PD.

Conclusions:

• Genetic predisposition to specific comorbidities does not distinguish PD patients from the general population.
• Within PD, genetic risk for comorbidities influences disease onset age and sex-specific clinical manifestations.
• Common genetic variants may act as modifiers of PD heterogeneity rather than primary risk factors.