Neuroinflammatory Pathways in the ALS-FTD Continuum: A Focus on Genetic Variants

Area of Science:

• Neuroscience
• Genetics
• Immunology

Background:

• Amyotrophic Lateral Sclerosis (ALS) and Frontotemporal Dementia (FTD) are progressive neurodegenerative diseases with overlapping genetic and pathological mechanisms.
• Familial cases of ALS and FTD, often linked to specific gene mutations (e.g., C9ORF72, TARDBP), highlight shared disease pathways.
• Pathogenesis involves protein misfolding, oxidative stress, impaired axonal transport, and increasingly, neuroinflammation.

Purpose of the Study:

• To review current evidence on neuroinflammatory markers across the ALS/FTD continuum.
• To focus on neuroinflammatory pathways implicated in genetically linked ALS-FTD cases.
• To explore the potential connection between genetic ALS-FTD and autoimmune disorders, and discuss therapeutic implications.

Main Methods:

• Comprehensive review of existing literature on neuroinflammation in ALS/FTD.
• Analysis of post-mortem studies, in vivo biofluid data, and neuroimaging findings.
• Examination of genetic factors contributing to neuroinflammation in these disorders.

Main Results:

• Neuroinflammation, involving cells like microglia and astrocytes, is a significant factor in ALS-FTD pathogenesis.
• Specific gene mutations associated with familial ALS-FTD are linked to distinct neuroinflammatory profiles.
• Evidence suggests a potential interplay between genetic predispositions and autoimmune mechanisms in ALS-FTD.

Conclusions:

• Neuroinflammation is a critical component of the ALS-FTD spectrum, particularly in genetically driven forms.
• Understanding these neuroinflammatory pathways may reveal links to autoimmune diseases.
• Targeting neuroinflammation presents a promising therapeutic avenue for ALS-FTD patients.