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Maintained memory in aging is associated with young epigenetic age.

Sofie Degerman1, Maria Josefsson2, Annelie Nordin Adolfsson3

  • 1Department of Medical Biosciences, Umeå University, Umeå, Sweden.

Neurobiology of Aging
|March 16, 2017
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Summary
This summary is machine-generated.

Younger epigenetic age, measured by DNA-methylation (DNAm) age, is linked to better memory maintenance over time. This epigenetic aging marker also predicts dementia risk, suggesting its role in cognitive aging.

Keywords:
AgingDNA-methylationDementiaEpigenetic ageEpisodic memoryLongitudinal study

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Area of Science:

  • Gerontology
  • Epigenetics
  • Neuroscience

Background:

  • Epigenetic alterations are implicated in age-related functional decline.
  • Accelerated epigenetic aging correlates with disease and mortality.
  • Understanding epigenetic age dynamics is crucial for cognitive aging research.

Purpose of the Study:

  • To investigate epigenetic age trajectories in relation to memory performance over 15 years.
  • To determine if epigenetic age predicts cognitive decline and dementia risk.

Main Methods:

  • Epigenetic (DNA-methylation) age and delta age were calculated from blood samples.
  • Longitudinal analysis was performed on 52 individuals (aged 55-65 at baseline) from the Betula study.
  • Memory trajectories (maintained, average decline, accelerated decline) were assessed over 15 years.

Main Results:

  • Individuals with maintained memory functions exhibited a lower delta DNAm age compared to those with average or accelerated decline.
  • Epigenetic age at follow-up, not chronological age, significantly predicted dementia.
  • A younger delta DNAm age was associated with preserved cognitive function.

Conclusions:

  • Epigenetic age is a dynamic biomarker associated with memory maintenance during aging.
  • Epigenetic age may serve as an early predictor for dementia risk.
  • Maintaining a younger epigenetic age appears beneficial for cognitive health in later life.