Charcot-Marie-Tooth Disease: Cellular Stress and Nerve Degeneration?

By Ana Espino | Published on June 19, 2026 | 4 min read

Charcot-Marie-Tooth disease (CMT) is the most common inherited peripheral neuropathy. It is characterized by progressive damage to motor and sensory nerves, leading to muscle weakness, sensory impairment, and walking difficulties. Although more than 130 genes have been identified as contributors to this disorder, the mechanisms explaining why certain peripheral neurons are particularly vulnerable remain poorly understood.

In a review published in Cells, researchers propose a new perspective on CMT associated with mutations in the HSPB1 gene, one of the known causes of axonal forms of the disease. According to the authors, the condition does not result solely from a genetic defect but rather from a complex interaction between genetic predisposition and environmental stressors. Peripheral neurons, which are exposed throughout life to significant mechanical, metabolic, and environmental challenges, may be especially susceptible to this harmful combination.


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Three Mechanisms at the Core of Neuronal Vulnerability

The authors describe three major pathological pathways that may contribute to the progressive degeneration of peripheral neurons.

The first involves impaired protein quality control. Under normal conditions, HSPB1 functions as a molecular chaperone, helping to prevent the accumulation of abnormal proteins during periods of cellular stress. Mutations in HSPB1 disrupt this protective role, promoting the buildup of misfolded proteins and impairing the autophagy pathways responsible for their clearance.

The second mechanism concerns disruption of the neuronal cytoskeleton. HSPB1 mutations interfere with the stability of microtubules and neurofilaments, structures that are essential for transporting nutrients, proteins, and organelles along axons. This disruption progressively compromises the function of the longest nerve fibers, particularly those supplying the lower limbs.

Finally, the researchers highlight mitochondrial dysfunction. Mitochondria, the primary energy producers of neurons, exhibit abnormalities in transport, dynamics, and quality control. These energy-related disturbances further increase neuronal vulnerability to physiological stress.


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Toward Intervention Before Symptoms Appear

One of the key messages of this review is that these cellular abnormalities appear to develop long before the first clinical symptoms emerge. The authors therefore support the concept of a “prodromal phase,” during which pathological processes are already active while patients remain asymptomatic. This period could represent a particularly valuable therapeutic window for slowing or preventing nerve degeneration.

Several potential therapeutic strategies are discussed, including the development of compounds capable of restoring autophagy, correcting abnormal HSPB1 interactions, or using antisense oligonucleotides targeting mutant forms of the protein. The authors also emphasize the potential of artificial intelligence to identify early biomarkers and accelerate the discovery of new treatments.


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A New Way of Understanding the Disease

This review proposes a paradigm shift in the understanding of certain forms of Charcot-Marie-Tooth disease. Rather than viewing the genetic mutation as the sole driver of disease progression, the authors suggest that degeneration results from the gradual inability of neurons to adapt to the multiple stressors they encounter throughout life.

This perspective opens the door to early neuroprotective strategies aimed at preserving neuronal homeostasis before irreversible damage occurs. Such approaches could ultimately transform the management of inherited peripheral neuropathies by focusing not only on the genetic defect itself but also on the cellular resilience mechanisms that determine neuronal survival.


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About the author – Ana Espino
PhD in Immunology, specialized in Virology  
As a scientific writer, Ana is passionate about bridging the gap between research and real-world impact. With expertise in immunology, virology, oncology, and clinical studies, she makes complex science clear and accessible. Her mission: to accelerate knowledge sharing and empower evidence-based decisions.