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Brain structural alterations in young girls with Rett syndrome: A voxel-based morphometry and tract-based spatial
Dongyun Li1, Lianni Mei1, Huiping Li1
1Department of Child Health Care, Children's Hospital of Fudan University, Shanghai, China.
Frontiers in Neuroinformatics
|September 26, 2022
Summary
Rett syndrome (RTT) brain imaging reveals reduced gray matter and altered white matter integrity, particularly in young girls. These structural changes correlate with clinical severity, offering insights into this neurodevelopmental disorder.
Area of Science:
- Neuroscience
- Medical Imaging
- Genetics
Background:
- Rett syndrome (RTT) is a severe neurodevelopmental disorder caused by mutations in the MECP2 gene, lacking effective treatments.
- Neuroimaging techniques like MRI provide non-invasive insights into brain structure and function in vivo.
- Understanding RTT's underlying neuropathology is crucial for developing therapeutic strategies.
Purpose of the Study:
- To investigate structural brain alterations in young girls with RTT using advanced MRI techniques.
- To compare brain structure between RTT patients, idiopathic autism spectrum disorder (ASD) cohorts, and typically developing children.
- To correlate observed brain structural changes with clinical severity and developmental assessments.
Main Methods:
- Combined T1-weighted imaging and diffusion tensor imaging (DTI) with voxel-based morphometry (VBM) for gray matter analysis.
- Utilized tract-based spatial statistics (TBSS) to analyze white matter integrity (fractional anisotropy and mean diffusivity).
- Employed pediatric-adjusted analytical pipelines for VBM and TBSS to enhance accuracy in children.
Main Results:
- VBM identified decreased gray matter volume in the insula, frontal cortex, calcarine, and limbic/paralimbic regions in RTT patients.
- TBSS revealed reduced fractional anisotropy (FA) and increased mean diffusivity (MD) in the corpus callosum, superior longitudinal fasciculus, and corona radiata.
- Clinical severity and social impairment scores correlated significantly with these observed structural brain alterations.
Conclusions:
- Early-stage RTT is characterized by specific gray and white matter structural abnormalities.
- These findings highlight the utility of advanced MRI techniques in characterizing RTT neuropathology.
- The study provides a foundation for understanding RTT pathogenesis and may guide future therapeutic interventions.
