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Area of Science:

  • Neuroscience
  • Human Genetics
  • Developmental Biology

Background:

  • Cortical folding is crucial for brain function, with genetic factors playing a key role.
  • Previous research primarily focused on the heritability of sulcal pits, neglecting gyral peaks.
  • Gyral peaks, consistent across individuals, represent an understudied aspect of cortical folding heritability.

Purpose of the Study:

  • To investigate the heritability of gyral peaks using high-resolution neuroimaging data.
  • To compare the genetic influences on gyral peaks versus sulcal pits.
  • To explore the relationship between cortical folding evolution and genetic determination.

Main Methods:

  • Classical twin analysis on Human Connectome Project (HCP) data.
  • Estimation of gyral peak heritability across cortical regions and hemispheres.
  • Comparative analysis of anatomical and functional measures for pits and peaks.
  • Correlation analysis with the evolutionary timeline of gyrification.

Main Results:

  • Heritability of gyral peaks is region-specific and largely symmetric between brain hemispheres.
  • Gyral peaks and sulcal pits exhibit distinct anatomical and functional characteristics.
  • Heritability estimates for both peaks and pits decrease linearly with the evolutionary timeline of gyrification.
  • Earlier-formed cortical folds (peaks and pits) demonstrate stronger genetic influences.

Conclusions:

  • Genetic factors significantly shape cortical folding, with earlier folds being more genetically determined.
  • Gyral peaks are not mere counterparts to sulcal pits, offering a more complete picture of folding genetics.
  • This study fills a critical knowledge gap on the heritability of gyral peaks, enhancing our understanding of brain development and evolution.