Tau Propagation Mechanisms and Therapeutic Interception Points¶
Analysis ID: SDA-2026-04-02-gap-tau-propagation-20260402 Date: 2026-04-02 Domain: Neurodegeneration -- Tauopathies
Objective¶
Model tau pathology spread through connected brain regions via prion-like transmission, trans-synaptic transfer, and extracellular vesicles. Identify key interception points for therapeutic intervention.
1. Brain Network Connectivity Model¶
Simulate a simplified brain connectivity graph for tau propagation modeling.
2. Tau Propagation Simulation¶
Model tau spread using a network diffusion model: d\u03c4/dt = \u03b2\u00b7C\u00b7\u03c4 - \u03b4\u00b7\u03c4, where C is connectivity, \u03b2 is spread rate, \u03b4 is clearance.
3. Therapeutic Interception Points¶
Model the effect of blocking different propagation mechanisms.
4. Extracellular Vesicle (EV) Tau Transfer¶
5. Hypotheses¶
H1: Network Topology Determines Vulnerability¶
Brain regions with highest connectivity centrality (entorhinal cortex, hippocampus) are seeded earliest. Test: Graph-theoretic metrics predict tau PET staging better than distance alone.
H2: Combination Therapy Is Required for Late-Stage Disease¶
Single-mechanism interventions (antibody OR clearance) reduce tau burden ~30-50%, but combination achieves >70%. Test: Anti-tau antibody + rapamycin combo trial.
H3: EV-Mediated Spread Dominates in Advanced Tauopathies¶
EV pathway genes are upregulated 2-4x in PSP/CBD/FTDP-17, while synaptic transfer decreases. Test: EV biogenesis inhibitors (GW4869) should slow tau spread in tau-P301S mice.
H4: Strain-Specific Propagation Patterns¶
Different tau strains (3R vs 4R) may preferentially use different propagation mechanisms. Test: Compare EV vs synaptic transfer efficiency for PSP-tau vs AD-tau strains.
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