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Mapping Brain Lesions to Conduction Delays: The Next Step for Personalized Brain Models in Multiple Sclerosis.
C Mazzara1,2,3, A Ziaeemehr3, E Troisi Lopez4
1Department of Promoting Health, Maternal-Infant. Excellence and Internal and Specialized Medicine (PROMISE) G. D'alessandro, University of Palermo, Palermo, Italy.
Human Brain Mapping
|May 3, 2025
Summary
Multiple sclerosis (MS) patients exhibit altered brain activity due to myelin damage. This study models how lesions impact nerve conduction delays, correlating with clinical disability in MS.
Area of Science:
- Neuroscience
- Biophysics
- Computational Biology
Background:
- Multiple sclerosis (MS) is an autoimmune disorder damaging the central nervous system's myelin sheath.
- Myelin damage slows nerve conduction, but the precise relationship between lesion intensity and conduction delay is unclear.
- Understanding this relationship is crucial for modeling MS pathophysiology and patient-specific outcomes.
Purpose of the Study:
- To quantify the relationship between myelin lesion intensity and nerve conduction delays in multiple sclerosis.
- To develop a computational model linking structural white matter damage to functional changes in neural activity.
- To explore the correlation between estimated conduction delays, brain activity, and clinical disability in MS patients.
Main Methods:
- Utilized large-scale brain models and Bayesian model inversion to estimate conduction delays from structural damage.
- Recorded magnetoencephalography (MEG) from 38 subjects (18 MS, 20 healthy) during resting-state.
- Analyzed white matter tractography, derived lesion matrices, and employed deep neural density estimators to model lesion impact.
Main Results:
- MS patients showed decreased alpha frequency power (8-13 Hz) compared to healthy controls.
- A linear model successfully translated lesion volume into conduction delays, with estimated parameters correlating with alpha peak frequency.
- Inferred model parameters were inversely proportional to observed alpha peaks and predictive of individual clinical disability.
Conclusions:
- This study provides the first location-specific estimation of how myelin lesions impact conduction delays in multiple sclerosis.
- The findings enhance the customization of brain models for individuals with MS, linking structural damage to functional and clinical outcomes.
- The developed model offers a novel approach to understanding MS pathophysiology and potentially guiding personalized treatment strategies.
