APOE4's Hidden Attack on Brain Wiring: The Myelin Connection

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New research reveals that the Alzheimer's risk gene APOEε4 undermines myelin integrity in aging brains through lipid metabolism dysfunction—adding a critical second mechanism to its neurodegenerative playbook. Here's what it means for carriers and researchers alike.

If you follow Alzheimer's research, you know APOEε4 as the variant that dramatically amplifies disease risk—roughly 3-4x for one copy, up to 12x for two. The dominant mechanistic story has centered on lipid-driven microglial inflammation: APOEε4 disrupts lipid handling in the brain's immune cells, nudging them toward a pro-inflammatory state that accelerates neurodegeneration.

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