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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
PubMed
Summary
This summary is machine-generated.

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.

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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.