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Williams syndrome: a relationship between genetics, brain morphology and behaviour.
1Institute of Psychology, Faculty of Social Sciences and Politics, University of Lausanne, Lausanne, Switzerland. cherine.fahim@unil.ch
Williams syndrome (WS) in children shows reduced brain surface area and volume, with increased gyrification, despite preserved cortical thickness. These findings suggest gene dosage abnormalities impact cortical development and brain structure in WS.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Williams syndrome (WS) offers unique insights into cortical development due to deleted genes affecting neuronal migration and maturation.
- WS presents a paradox: intellectual and visuospatial deficits coexist with preserved language and social cognition.
- This makes WS a valuable model for studying gene-brain-behavior relationships.
Purpose of the Study:
- To investigate the genotype-phenotype relationship in Williams syndrome.
- To analyze cortical surface-based morphometry and complexity in children with WS.
- To compare brain structure between WS patients and healthy controls.
Main Methods:
- Used in vivo anatomical magnetic resonance imaging (MRI).
- Analyzed cortical surface area, volume, thickness, gyrification index, and complexity.
- Compared 10 children with WS (ages 2.27-14.6 years) with 12 age/gender-matched healthy controls.
Main Results:
- Children with WS had relatively preserved cortical thickness (Cth).
- Significantly reduced surface area (SA) and cortical volume (CV) were observed in WS.
- Increased gyrification index (GI) in the parietal lobe and decreased cortical complexity (CC) in frontal and parietal lobes were noted in WS.
Conclusions:
- WS gene deletions may affect founder cell number, reducing SA and CV while sparing Cth.
- Findings align with the radial-unit hypothesis of cortical development.
- Cortical brain structure in WS appears to be shaped by gene-dosage abnormalities.
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