Cortical Circuit Dysfunction as a Potential Driver of Amyotrophic Lateral Sclerosis

Area of Science:

• Neuroscience
• Neurology

Background:

• Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease affecting cortical and spinal neurons, leading to progressive paralysis.
• Evidence suggests ALS originates in the cerebral cortex and spreads downwards (corticofugal).
• Transcranial magnetic stimulation studies show early cortical hyperexcitability in ALS patients.

Purpose of the Study:

• To explore the hypothesis that cortical circuit dysfunction drives ALS onset and progression.
• To review current research on the cellular and molecular origins of cortical hyperexcitability in ALS.

Main Methods:

• Review of functional, imaging, and transcriptomic studies in ALS patients.
• Analysis of electrophysiological, pathological, and transcriptomic studies in animal and cellular ALS models.

Main Results:

• Cortical hyperexcitability, resulting from increased neuronal excitability and decreased inhibition, is a key feature in ALS.
• This dysfunction may initiate and propagate the disease process.

Conclusions:

• Initial dysfunction in cortical circuits is a potential primary driver of ALS.
• Understanding the cellular and molecular basis of cortical hyperexcitability is crucial for ALS research.