Brain structural changes in alternating hemiplegia of childhood using single-case voxel-based morphometry analysis

Area of Science:

• Neuroscience
• Medical Imaging
• Genetics

Background:

• Alternating hemiplegia of childhood (AHC) is a rare neurodevelopmental disorder linked to ATP1A3 gene mutations.
• Understanding the structural brain changes in AHC is crucial for diagnosis and management.

Purpose of the Study:

• To compare gray matter (GM) and white matter (WM) brain volumes between AHC patients and healthy controls using voxel-based morphometry (VBM).
• To investigate the relationship between clinical severity (motor, cognitive, and epilepsy status) and regional brain volume differences in AHC patients.

Main Methods:

• VBM analysis of 3D T1-weighted MRI scans was performed on 9 AHC patients and 20 age-matched controls.
• Single-case VBM analysis examined correlations between GM/WM volumes and clinical severity metrics in AHC patients.

Main Results:

• AHC patients exhibited significant GM reductions in hippocampi and cerebellum, and WM reductions in cerebral hemispheres compared to controls.
• Reduced cerebellar GM/WM volume correlated with greater motor dysfunction.
• Insular GM reduction was observed in some patients with cognitive dysfunction, and hippocampal GM reduction in those with status epilepticus.

Conclusions:

• VBM analysis, including single-case approaches, can reveal associations between regional brain volume changes and clinical symptom severity in AHC.
• This study highlights specific structural brain alterations in AHC and their correlation with disease severity, even in a small cohort.