Distinguish risk genes functioning at presynaptic or postsynaptic regions and key connectomes associated with...

Area of Science:

• Neuroscience
• Computational Biology
• Genetics

Background:

• Pathological alpha-synuclein (α-Syn) spread along neuronal networks is implicated in neurodegenerative diseases.
• Key questions remain regarding the specific connections and genes driving this pathology progression.

Purpose of the Study:

• To identify critical connections in the connectome essential for predicting α-Syn progression.
• To pinpoint risk genes involved in α-Syn pathology spreading at presynaptic and postsynaptic sites.
• To investigate the cellular enrichment of these risk genes.

Main Methods:

• Novel mathematical modeling approaches.
• Analysis of brain connectome data.
• Gene regulatory network analysis.

Main Results:

• α-Syn spreading is predominantly determined by a small subnetwork (2% of strongest connections).
• Risk genes are significantly enriched in microglial cells (presynaptic) and neurons (postsynaptic).
• Identified 'key driver' genes overlap with Parkinson's disease risk genes.

Conclusions:

• The study identifies critical subnetworks and cell-type-specific risk genes governing pathological α-Syn transmission.
• Demonstrates functionally distinct roles for presynaptic and postsynaptic gene mediators in α-Syn spreading.
• Provides insights into the molecular mechanisms underlying α-Syn propagation in neurodegenerative conditions.