Increased local gyrification mapped in Williams syndrome

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Human Anatomy

Background:

• Williams syndrome (WS) is a genetic disorder associated with distinct cognitive and behavioral profiles.
• Previous research suggests global differences in brain structure in WS, but detailed cortical anatomy remains less understood.

Purpose of the Study:

• To precisely map gyrification differences across the cortical surface in individuals with Williams syndrome compared to healthy controls.
• To investigate regional variations and hemispheric asymmetries in cortical folding patterns in WS.

Main Methods:

• Utilized a novel method for high-resolution analysis of cortical gyrification.
• Examined thousands of points on the lateral and medial cortical surfaces.
• Compared gyrification patterns between 42 subjects with WS and 40 age-matched healthy controls.

Main Results:

• Individuals with WS showed significantly increased gyrification bilaterally in occipital regions and over the cuneus.
• Greater gyrification in WS was observed in the left hemisphere, including the precuneus, cingulate cortex, and mesial frontal lobe.
• No cortical areas exhibited greater convolution in healthy subjects compared to those with WS.

Conclusions:

• Findings confirm and extend previous studies on cortical complexity in WS.
• Observed gyrification abnormalities in WS may be linked to neuronal circuit dysfunction.
• These anatomical differences could contribute to the distinct neurodevelopmental profile of Williams syndrome.