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Published on: September 20, 2018
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Clinical Manifestations
Alyssa C Kam1, Christopher R Beam1, Eric Turkheimer2
1University of Southern California, Los Angeles, CA, USA.
Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 25, 2025
Summary
Early Alzheimer's disease (AD) biomarker detection in midlife is crucial. This study found no significant link between blood biomarkers like amyloid-beta and ptau181 and memory performance in middle-aged adults.
Area of Science:
- Neuroscience
- Biomarker Research
- Aging Studies
Background:
- Identifying Alzheimer's disease (AD) risk factors in midlife is key for early intervention.
- Understanding blood-based AD biomarkers (amyloid-β42/40, ptau181) and their relation to memory in middle age is understudied.
- Existing research on AD biomarkers primarily focuses on older populations.
Purpose of the Study:
- To investigate the association between blood-based AD biomarkers and episodic memory in middle-aged adults.
- To determine if midlife biomarker levels predict memory functioning.
- To explore within-family and between-family associations.
Main Methods:
- Analyzed blood biomarkers (amyloid-β42/40, ptau181) and episodic memory scores (CVLT-3) in 154 midlife twins.
- Utilized Pearson correlations and mixed-effects regression.
- Examined associations with four CVLT-3 subtests: immediate recall, short-delay recall, long-delay recall, and recognition.
Main Results:
- No statistically significant correlations were found between amyloid-β42/40 or ptau181 and episodic memory subtests.
- A potential negative association between ptau181 and episodic memory was suggested but not statistically significant.
- Neither between-family nor within-family correlations were observed.
Conclusions:
- Blood-based AD biomarker levels did not correlate with memory functioning in the studied middle-aged sample.
- These findings suggest that individual differences in these biomarkers may not predict memory performance in middle adulthood.
- Further research is needed to understand the role of AD biomarkers across different life stages.
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