Discovery of Protein Linked to Alzheimer’s Genetic Risk Uncovered

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Researchers from Columbia University have published findings in Nature Aging revealing that a protein named fibronectin plays a crucial role in elucidating how the APOE4 gene, present in approximately 20% of the population, increases the likelihood of developing Alzheimer’s by compromising the integrity of the blood-brain barrier. Mice that possess the human APOE4 gene exhibited nearly double the levels of fibronectin in their brains compared to those with the APOE3 variant. An increase in fibronectin was associated with a deterioration of the barrier, while its reduction led to enhanced barrier functionality. A rare variant of a protective gene aligns with these findings. While the majority of the data is derived from studies involving cells, fish, and mice, clinical applications remain in the experimental phase. This report outlines the implications of these discoveries. Disclosure: This video contains stock footage and content created or enhanced using AI-assisted tools.  ai-generated

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00:00About one in five people carry a gene variant called APOE4, which raises the risk of Alzheimer's

00:06disease. Now, Columbia University researchers may have found part of the reason why and why

00:12some carriers escaped the disease. Their study in nature aging points to a protein called

00:17fibronectin. The team analyzed human brain tissue and spinal fluid, then tested their idea in stem

00:23cell models, 3D blood vessel cultures, zebrafish, and mice. Mice carrying the human APOE4 gene had

00:31nearly twice as much fibronectin in the brain as mice carrying the common APOE3 version.

00:36When the researchers raised fibronectin in support cells called astrocytes, the blood-brain barrier,

00:42the protective lining of the brain's blood vessels weakened. Lowering it improved the barrier.

00:48That fits with a rare gene variant that protects against Alzheimer's by changing fibronectin,

00:53now the limits. Most of the evidence comes from cells, fish, and mice. Treatments are experimental.

00:59And fibronectin also helps repair tissue, so any drug would need to be careful. Having APOE4 does

01:05not guarantee Alzheimer's. Disclosure. This video contains stock footage and content created or

01:10enhanced using AI-assisted tools.

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