Implications of structural and functional brain changes in amyotrophic lateral sclerosis

Area of Science:

• Neuroscience
• Neurology
• Medical Imaging

Background:

• Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease characterized by muscle weakness and disability.
• Disease heterogeneity presents significant challenges in understanding prognosis, disease spread, and clinical trial efficacy.
• Advanced neuroimaging techniques are crucial for elucidating the complex mechanisms underlying ALS.

Purpose of the Study:

• To review patterns of cortical and subcortical changes in ALS using advanced neuroimaging.
• To discuss the implications of these neuroimaging findings for diagnosis, prognosis, and biomarker development.
• To explore how neuroimaging can address the heterogeneity of ALS.

Main Methods:

• Review of recent advances in neuroimaging techniques applied to ALS.
• Analysis of structural, molecular, and functional brain changes.
• Correlation of neuroimaging findings with clinical data, including cognitive impairment, phenotypes, and genotypes.

Main Results:

• Consistent identification of specific cortical and subcortical signatures and atrophy patterns in ALS.
• Evidence of disease spread, particularly in frontotemporal networks, correlating with cognitive decline and poorer prognosis.
• Observed cortical differences linked to ALS phenotypes and genotypes, contributing to prognostic heterogeneity.

Conclusions:

• Neuroimaging provides critical pathophysiological insights into the heterogeneous nature of ALS.
• Identifying brain signatures can improve diagnosis, guide prognosis, and direct therapeutic strategies.
• Multimodal approaches with larger cohorts are essential for developing sensitive, individualized biomarkers for ALS progression.