Brain network alterations in fragile X syndrome

Area of Science:

• Neuroscience
• Genetics
• Developmental Disorders

Background:

• Fragile X syndrome (FXS) results from FMR1 gene mutations, leading to significant brain alterations affecting cognition and behavior.
• Recent research has deepened the understanding of the neural underpinnings of FXS.

Purpose of the Study:

• To provide a comprehensive review of neuronal network alterations in FXS.
• To link neuroimaging findings with molecular and genetic data in FXS.

Main Methods:

• Review of imaging studies (resting-state networks, graph analysis, meta-analytic mapping).
• Integration of molecular studies on neurometabolic imbalances (GABAergic, glutamatergic systems).
• Exploration of gene-brain-behavior correlations using FMR1 gene expression maps.

Main Results:

• Imaging studies reveal network-level disruptions in default mode, frontoparietal, salience, and basal ganglia networks in FXS.
• Dysregulated network activity correlates with neurometabolic imbalances, particularly in GABAergic and glutamatergic systems.
• FMR1 gene expression patterns are linked to specific clinical symptoms in FXS.

Conclusions:

• FXS is characterized by widespread neuronal network alterations impacting cognitive, emotional, and motor functions.
• Future research should focus on global collaboration, diverse populations, and transdiagnostic approaches for improved neuroimaging and therapeutics.
• Understanding gene-brain-behavior links is crucial for advancing FXS research.