APOE4 Hub

A single polymorphism activating 8+ pathogenic mechanisms simultaneously — both loss-of-function AND gain-of-function.

Pathogenic Mechanisms

• Loss of disulfide bridge = unprotected PUFA cargo = lipid peroxidation
• Impaired retromer function and endosomal trafficking
• Reduced excitatory tone
• Altered lipid raft organization and complement activation
• Promotes Ephexin5-RhoA activation and dendritic spine collapse
• Degrades reelin signaling at the shared ApoER2/VLDLR lipoprotein receptors — apoE and reelin compete for the same receptor system, so ApoE4's impaired receptor recycling is predicted to blunt the protective reelin→Dab1 brake on tau

Key Concept

APOE4 is simultaneously loss-of-function AND gain-of-function, making it a uniquely powerful risk factor that feeds into nearly every other convergence node.

Related Researchers

To be populated after CSC grading.

See Also

• Reelin-ApoE receptor axis disruption -- reelin and ApoE compete at ApoER2/VLDLR; the two PSEN1-E280A resilience cases (APOE3-Christchurch and RELN-COLBOS) dial the same heparan-sulfate-dependent receptor node in opposite directions, placing reelin at the centre of the ApoE-resilience story rather than at its margin
• Endosomal Nexus
• Cytoskeletal Collapse Node
• Neuroimmune Interface
• TOMM40 Import Gate -- The TOMM40 poly-T polymorphism (rs10524523) is in tight LD with APOE4 at 19q13.32; apoE4 fragments converge on the mitochondrial import apparatus, so this hub meets the import gate at the organelle, not only in the genome