Large-scale pathway specific polygenic risk and transcriptomic community network analysis identifies novel functional...

Area of Science:

• Neurogenetics
• Molecular Biology
• Systems Biology

Background:

• Polygenic inheritance is central to Parkinson disease (PD) etiology.
• Understanding genetic risk factors is crucial for identifying therapeutic targets.
• Previous studies lacked comprehensive analysis of large-scale genetic and gene expression data.

Purpose of the Study:

• To identify biological processes underlying PD genetic risk using a hypothesis-free approach.
• To define the role of common and rare genetic variations in PD.
• To pinpoint specific cellular and molecular pathways for therapeutic intervention.

Main Methods:

• Utilized large-scale polygenic risk score (PRS) analyses on gene sets from International Parkinson's Disease Genetics Consortium (IPDGC) and Accelerating Medicines Partnership-Parkinson's disease (AMP-PD) cohorts.
• Assessed rare variant burden using whole-genome sequencing data.
• Integrated single-cell gene expression and blood transcriptomic data to build network expression community maps.

Main Results:

• Nominated key PD etiological processes: protein misfolding, immune response, lipid metabolism, synaptic transmission, and apoptosis.
• Identified significant risk enrichment in dopaminergic neurons, serotonergic neurons, and neural progenitors.
• Revealed functional enrichment in inflammatory signaling, cell death, and mitochondrial homeostasis pathways in PD patient blood transcriptomes.

Conclusions:

• Specific molecular and cellular pathways are strongly implicated in Parkinson disease pathogenesis.
• Genetic risk in PD is associated with neuronal dysfunction, immune dysregulation, and metabolic disturbances.
• The study provides a prioritized list of genes and cellular contexts for future functional studies and therapeutic development.