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Polygenic Index for Sleep Duration and Brain Changes over Time.

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Summary
This summary is machine-generated.

Genetic predisposition for longer sleep duration, measured by a Sleep PGI, is linked to better brain health trajectories in adults. This association was particularly evident in younger individuals, suggesting potential for personalized sleep interventions.

Keywords:
brain morphometrypolygenic indexsleep

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Area of Science:

  • Neuroscience
  • Genetics
  • Sleep Science

Background:

  • Sleep is vital for cognitive function, emotional regulation, and overall health.
  • Genomics and neuroimaging reveal links between genetics, sleep, and brain structure.
  • This study explores the genetic influence on sleep duration and its impact on brain changes.

Purpose of the Study:

  • To investigate the association between genetic predisposition for sleep duration (Sleep PGI) and longitudinal brain changes.
  • To examine how this association varies across different age groups (young, middle, old).

Main Methods:

  • Utilized longitudinal data from the RANN and CR studies (n=94).
  • Assessed brain measures including cortical thickness, gray/white matter volume, and white matter hyperintensities (WMH) volume.
  • Employed Generalized Estimated Equations for statistical analysis, including age-group stratifications.

Main Results:

  • A higher Sleep PGI was associated with increased temporal WMH volume over time across all ages.
  • Age significantly moderated the relationship between Sleep PGI and longitudinal changes in hippocampal volume, cortical white matter volume, and total/parietal WMH volume.
  • The protective effect of genetic predisposition for longer sleep was more pronounced in younger adults.

Conclusions:

  • Genetic factors influencing sleep duration are associated with brain changes in healthy adults.
  • A genetic predisposition for longer sleep duration correlates with reduced brain decline trajectories.
  • Findings highlight the importance of sleep duration for brain health and suggest potential for personalized interventions.