Diffusion tensor imaging in Chediak Higashi Disease.

Area of Science:

• Neuroimaging
• Neurology
• Biomarkers

Background:

• Chediak-Higashi Disease (CHD) is a rare genetic disorder with significant neurological implications.
• Understanding the natural history of neurodegeneration in CHD is crucial for patient management.
• Diffusion Tensor Imaging (DTI) offers insights into white matter integrity.

Purpose of the Study:

• To characterize the natural history of DTI metrics in pediatric patients with CHD.
• To compare DTI findings in CHD participants with neurotypical controls (NC).
• To evaluate DTI as a potential neuroimaging biomarker for CHD.

Main Methods:

• Acquired DTI scans from 15 CHD participants and 100 NC.
• Analyzed DTI metrics: fractional anisotropy (FA), mean, axial, and radial diffusivity (MD, AD, RD).
• Utilized correlational tractography to identify group differences in white matter pathways.

Main Results:

• Pediatric CHD participants showed similar baseline DTI metrics to NC.
• Progressive increases in MD, AD, and RD were observed in CHD participants compared to NC.
• Correlational tractography revealed decreased FA and increased MD, AD, and RD in specific fiber tracts in CHD.

Conclusions:

• Progressive DTI metric deviations in CHD indicate ongoing neurodegeneration.
• Cerebellar white matter aberrations correlate with clinical symptoms like cerebellar dysfunction and cognitive decline.
• DTI shows promise as a neuroimaging marker for tracking CHD progression and neurodegeneration.