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Imaging study links key genetic risk for Alzheimer's disease to myelin breakdown

ks myelin, disrupts message transfer through the axons and eventually can lead to the brain/mind-destroying plaques and tangles visible years later in the cortex of Alzheimer patients.

The Apolipoprotein E (ApoE) genotype is the second most influential Alzheimer risk factor, after only advanced age. The study used MRI to assess myelin breakdown in 104 healthy individuals between ages 55 and 75 and determine whether the shift in the age at onset of Alzheimer disease caused by the ApoE genotype is associated with age-related myelin breakdown.

The results show that in later-myelinating regions of the brain, the severity and rate of myelin breakdown in healthy older individuals is associated with ApoE status. Thus both age, the most important risk factor for Alzheimer disease, and ApoE status, the second-most important risk factor, seem to act through the process of myelin breakdown.


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Source:University of California - Los Angeles


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