Abstract
Purpose
Brain involvement in X-linked Charcot-Marie-Tooth disease (CMTX) has been previously reported. We studied the brain structural and functional integrity using a multimodal neuroimaging approach in patients with no current central nervous system (CNS) symptoms, in order to further delineate the disease’s phenotype.
Methods
Seventeen CMTX patients with no current CNS symptoms and 24 matched healthy controls underwent brain magnetic resonance imaging (MRI). Structural integrity was evaluated performing Gray matter analysis with voxel-based morphometry (VBM) and tract-based spatial statistics (TBSS) of diffusion tensor imaging (DTI). Functional integrity was evaluated with resting-state functional MRI (rs-fMRI).
Results
Decreased gray matter density was detected in CMTX patients compared to healthy controls in bilateral hippocampus, left thalamus, left postcentral gyrus, left superior parietal lobule, left cerebellum crus I and II, and vermis VI. DTI analysis showed increased fractional anisotropy and radial diffusivity in the right anterior insula and increased axial diffusivity in right cerebellum crus I in CMTX patients. rs-fMRI revealed decreased spontaneous neural activity on left precentral gyrus in patients compared to healthy controls.
Conclusion
Advanced magnetic resonance (MR) neuroimaging techniques in CMTX patients revealed structural and functional involvement of multiple motor and extra-motor brain areas. MR neuroimaging techniques have the potential to delineate the CNS phenotype of a peripheral neuropathy like CMTX.
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Data availability
All the imaging and clinical data are available upon request.
Code availability
MATLAB toolboxes and FMRIB Software Library (FSL) software are publicly available.
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Acknowledgements
We would like to thank all patients and healthy controls for their generosity to participate in the present study.
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FC is supported by the EU-IKY Scholarship Program (European Social Fund-ESF), the Greek “Reinforcement of Postdoctoral Researchers” grant (5033021) of the “Human Resources Development Program, Education and Lifelong Learning” of the National Strategic Reference Framework (NSRF 2014–2020).
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Georgios Velonakis and Georgios Koutsis contributed to the study conception and design. Material preparation was performed by Efstratios Karavasilis, Georgios Velonakis, Georgios Koutsis, Marianthi Breza and Constantin Potagas, method preparation was performed by Georgios Velonakis, Efstratios Karavasilis, Dimitrios Filippiadis, clinical data collection was performed by Georgia Angelopoulou, Dimitrios Kasselimis, Zoi Kontogeorgiou, Georgia Karadima, Georgios Koutsis imaging data collection and evaluation were performed by Efstratios Karavasilis, Irene Pantou, Dimitrios Fillipiadis, Georgios Velonakis, the image post-processing and statistical analysis were performed by Efstratios Karavasilis and Foteini Christidi. The first draft of the manuscript was written by Efstratios Karavasilis, Georgios Velonakis, Foteini Christidi and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Karavasilis, E., Christidi, F., Pantou, E. et al. Structural and functional brain changes in X-linked Charcot-Marie-Tooth disease: insights from a multimodal neuroimaging study. Neuroradiology 64, 543–552 (2022). https://doi.org/10.1007/s00234-021-02730-x
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DOI: https://doi.org/10.1007/s00234-021-02730-x