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Brain protein’s links to thinking varied across regions

In people below the cutoff for widespread amyloid buildup, an observational study found that some links to thinking abilities varied with brain connections.

Paper by Chuyao Yan, Marcel Daamen, Xiaochen Hu, +3 more authorsXueyan Jiang · Nanjing Normal University
Figure 2. Association between precuneus amyloid burden and cognitive performance in globally amyloid-negative individuals.
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Figure 2. Association between precuneus amyloid burden and cognitive performance in globally amyloid-negative individuals.Association between precuneus amyloid burden and cognitive performance in globally amyloid-negative individuals.Yan et al.

Our read

Mechanisms
Studied:
Preprint: cohort study of globally amyloid-negative individuals, 6 to 110 months
What changed:
Amyloid’s links to thinking varied across brain regions, depending on network connections in some regions but not the precuneus
The catch:
Thinking was measured using a cognitive composite score, a proxy for everyday cognitive functioning
Why it’s aging research:
A leading disease of aging, its risks or menopause.

Editor of record: Boris Djordjevic · AgingResearch.News

Paper
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People below the threshold for widespread buildup of amyloid-beta, a protein that can accumulate in the brain, were examined in an observational analysis using Sino Longitudinal Study on Cognitive Decline data. Amyloid in the precuneus, a brain region, was associated with thinking abilities regardless of brain connection patterns. In several other regions, the associations mainly depended on how centrally each region sat within the brain’s structural connections.

In the separate Harvard Aging Brain Study, amyloid in several regions whose associations depended on brain connections predicted cognitive decline over three and eight years. Precuneus amyloid predicted later increases in overall brain amyloid.

Why it matters

For understanding cognitive decline with aging, the authors emphasize where amyloid accumulates and how those regions connect, rather than relying only on whole-brain cutoffs.

Caveats

The observational analyses linked regional amyloid with cognition but did not test whether changing amyloid levels altered thinking abilities. The work is a preprint and has not been peer-reviewed.

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