Exploring Immunogenetic Mechanisms in Parkinson's Disease Using Single-Cell Transcriptomics and Mendelian...

Area of Science:

• Neuroimmunology
• Genetics
• Neurodegeneration

Background:

• Parkinson's disease (PD) involves progressive dopaminergic neuron loss.
• The role of immunity in PD pathogenesis is increasingly recognized but poorly understood.
• Immunogenetic mechanisms underlying PD progression require further elucidation.

Purpose of the Study:

• To investigate immune cell infiltration and transcriptional regulation in PD using an integrative approach.
• To identify specific immune-related genes and regulatory networks implicated in PD.
• To explore potential therapeutic targets for Parkinson's disease.

Main Methods:

• Integrative analysis combining Mendelian randomization (MR), expression quantitative trait loci (eQTL), and single-cell RNA sequencing (scRNA-seq).
• Assessed immune cell composition, pathway activation, and gene regulatory networks via scRNA-seq.
• Utilized MR to identify causal genetic associations with immune cell infiltration and PD risk.

Main Results:

• Significant increases in naive B cells, plasma cells, and memory B cells observed in PD patients.
• Identified five causal genes (CYTH4, FGR, LRRK2, RIN3, SAT1) linked to immune cell infiltration.
• SAT1 and RIN3 showed strong associations with PD risk; SAT1-PARK7 axis linked to oxidative stress, FGR-ABCA4 to metabolic/immune pathways.

Conclusions:

• Distinct immunogenetic mechanisms contribute to PD progression.
• The SAT1-PARK7 and FGR-ABCA4 interactions provide mechanistic insights into PD pathogenesis.
• Identified novel immune-related gene networks in PD, suggesting potential therapeutic targets.