Neurodegeneration
Does brain white matter change before Alzheimer's symptoms start?
Open access · cc by · source: Europe PMC
Changes in the brain's white matter connection pathways can be detected up to a decade before the onset of inherited Alzheimer's disease symptoms.
Key findings
The study revealed that white matter deterioration, specifically increased mean diffusivity, begins approximately 10 years before predicted symptom onset. These alterations were earliest in the forceps major and forceps minor tracts and were closely linked to standard biomarkers of amyloid, tau, and microglia activity.
Methodology
The researchers analyzed brain imaging and spinal fluid data from 109 participants who had a family history of autosomal-dominant Alzheimer's disease. They used diffusion tensor imaging to measure white matter integrity and compared 64 mutation carriers with 45 non-carrier family members. These measurements were evaluated based on the participants' estimated years from symptom onset.
Limitations
Because the study focused on autosomal-dominant Alzheimer's, which is a rare genetic form, the findings may not apply directly to the much more common sporadic late-onset version. The cross-sectional design means researchers cannot definitively prove that white matter degeneration causes clinical symptoms or grey matter loss over time. Additionally, because mutation carriers are relatively young, this study does not rule out how normal age-related blood vessel changes might alter white matter in older adults.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
White matter degradation begins approximately ten years before the predicted onset of symptoms in autosomal-dominant Alzheimer's disease and is closely tied to biomarkers of amyloid, tau, and microglia activity.
Evidence for the claim as stated.
Microstructural alterations in brain tissue, including changes in tissue diffusivity, can precede and predict future cognitive decline in neurodegenerative diseases.
Evidence for the claim as stated.
In autosomal dominant Alzheimer's disease, white matter diffusion alterations begin approximately 10 years before predicted symptom onset, showing earliest changes in the forceps major and minor.
Evidence for the claim as stated.
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