Diffuse brain connectivity changes in Charcot-Marie-Tooth type 1a patients: a resting-state functional magnetic...

Area of Science:

• Neuroscience
• Neurology
• Medical Imaging

Background:

• Peripheral neuropathies, such as Charcot-Marie-Tooth disease type 1A (CMT1A), are known to affect brain structure and function.
• Investigating these central nervous system changes is crucial for understanding the full impact of CMT1A.

Purpose of the Study:

• To systematically investigate modifications in major large-scale brain networks in CMT1A patients.
• To utilize resting-state functional magnetic resonance imaging (RS-fMRI) to assess functional connectivity (FC) in the CMT1A brain.

Main Methods:

• Acquired 3-T MRI brain scans from genetically confirmed CMT1A patients and healthy controls.
• Analyzed RS-fMRI data using a seed-based approach targeting 8 major brain networks.
• Corrected for grey matter density and investigated correlations between FC modifications and neurological impairment.

Main Results:

• CMT1A patients exhibited increased FC in visual, salience, dorsal attention, and language networks compared to controls.
• Reduced FC was observed in the visual cortex and left lentiform nucleus in CMT1A patients.
• Increased FC correlated significantly with neurophysiological impairment and reduced walking ability.

Conclusions:

• The CMT1A brain shows widespread functional reorganization across multiple large-scale networks.
• These functional changes are independent of structural modifications.
• The observed brain network alterations partially correlate with the degree of peripheral nerve damage and functional deficits in CMT1A.