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Genetic and environmental influences on cortical mean diffusivity.

Jeremy A Elman1, Matthew S Panizzon1, Donald J Hagler2

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Cortical mean diffusivity (MD) is heritable and captures unique genetic influences distinct from cortical thickness. This finding supports its use in neurodegenerative disease research and gene association studies.

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Area of Science:

  • Neuroimaging
  • Genetics
  • Brain Aging

Background:

  • Magnetic resonance imaging (MRI) aids in detecting age-related brain changes.
  • Cortical mean diffusivity (MD) may detect early Alzheimer's disease (AD) effects before structural MRI changes.
  • Understanding genetic and environmental influences on cortical MD is crucial for its clinical relevance.

Purpose of the Study:

  • To investigate genetic and environmental influences on cortical MD in middle-aged men.
  • To determine if genetic influences on cortical MD overlap with those on cortical thickness and white matter (WM) MD.
  • To assess the biological relevance of cortical MD for neurodegenerative disease research.

Main Methods:

  • Utilized diffusion MRI scans to derive cortical MD.
  • Conducted univariate twin analyses to assess heritability of cortical MD.
  • Performed trivariate analyses to examine shared genetic variance between cortical MD, cortical thickness, and WM MD.

Main Results:

  • Cortical MD demonstrated significant heritability across most brain regions, with estimates ranging from 0.38 to 0.66.
  • Trivariate analyses revealed shared genetic variance between cortical MD and other MRI measures, but this overlap was incomplete.
  • A substantial portion of distinct genetic variance influences individual differences in cortical MD.

Conclusions:

  • Cortical MD is a heritable trait with unique genetic underpinnings.
  • Cortical MD captures genetic information not fully explained by cortical thickness or WM MD.
  • Cortical MD holds potential for future studies on neurodegenerative diseases and gene associations.