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Understanding Charcot-Marie-Tooth Disease Type 1A (CMT1A)

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Charcot-Marie-Tooth disease type 1A (CMT1A) is a slowly progressive genetic nerve condition caused by a duplication of the PMP22 gene. It causes muscle weakness and sensory changes in the hands and feet. While there is no cure, physical therapy and bracing can greatly improve mobility.

Key Takeaways

  • • CMT1A is the most common hereditary peripheral neuropathy, affecting approximately 1 in 2,500 people.
  • • The disease is fundamentally caused by a duplication of the PMP22 gene, which damages the myelin insulation around peripheral nerves.
  • • Typical symptoms include muscle weakness in the hands and feet, sensory changes, and foot deformities like high arches.
  • • While there is currently no cure, proactive management with physical therapy and proper bracing can significantly improve mobility.
  • • Patients with CMT1A should work with their care team to avoid neurotoxic medications and consider genetic counseling for their families.

Charcot-Marie-Tooth disease type 1A (CMT1A) is the most common form of hereditary peripheral neuropathy, affecting approximately 1 in 2,500 people [1][2]. Being diagnosed with a genetic nerve condition can be overwhelming, but understanding the disease is your first and most powerful tool for managing it.

CMT1A is a slowly progressive condition that affects the peripheral nerves—the “wires” that connect your brain and spinal cord to your muscles and sensory organs. It is fundamentally caused by a duplication of the PMP22 gene, which leads to damage of the myelin (the protective insulation) around these nerves [3]. Over time, this disruption leads to symptoms such as muscle weakness in the hands and feet, foot deformities like high arches (pes cavus), and changes in sensation [4].

While there is currently no cure, proactive management through multidisciplinary care, physical therapy, and appropriate bracing can significantly improve your mobility and quality of life [5]. Furthermore, dedicated clinical research is underway to target the genetic root of the disease, providing hope for future therapies [6].

This guide is designed to help you understand the biology of your diagnosis, avoid common medical pitfalls like misdiagnoses or neurotoxic medications, and prepare you for productive, empowering conversations with your care team.

Frequently Asked Questions

What is Charcot-Marie-Tooth disease type 1A?
CMT1A is the most common form of hereditary peripheral neuropathy. It is a slowly progressive genetic condition that damages the myelin, which is the protective insulation around your peripheral nerves.
What are the common symptoms of CMT1A?
Common symptoms include muscle weakness in the hands and feet, changes in sensation, and foot deformities such as abnormally high arches, which are medically known as pes cavus.
What causes CMT1A?
The condition is caused by a genetic mutation, specifically a duplication of the PMP22 gene. This genetic change disrupts the protective coating around your nerves, affecting how they communicate with your muscles and sensory organs.
Should my family members be tested for CMT1A?
Because CMT1A is a hereditary condition, it can be passed down in families. You should discuss genetic counseling and testing with your doctor to understand the risks for your family members and for family planning.
How is CMT1A treated?
While there is currently no cure, you can manage the condition proactively. This includes participating in physical therapy, using appropriate bracing to maintain mobility, and strictly avoiding certain neurotoxic medications that can further damage your nerves.

Questions for Your Doctor

  • • Are there dedicated CMT clinics or Centers of Excellence near me?
  • • How do I build a comprehensive care team that understands the nuances of CMT1A?
  • • Should my family members consider genetic counseling or testing based on my diagnosis?
  • • What are the first steps I should take to protect my nerve function from other potential threats, like neurotoxic medications?

Questions for You

  • • What symptoms first brought me to the doctor, and how have they changed over time?
  • • What are my biggest priorities for my care right now (e.g., maintaining mobility, managing fatigue, planning for a family)?
  • • How can I adapt my daily life to protect my energy levels?

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References

  1. 1

    Synergistic effect of Wharton's jelly-derived mesenchymal stem cells and insulin on Schwann cell proliferation in Charcot-Marie-Tooth disease type 1A treatment.

    Oh SJ, Kim H, Park SE, et al.

    Neurobiology of disease 2024; (203()):106725 doi:10.1016/j.nbd.2024.106725.

    PMID: 39536952
  2. 2

    Mechanisms and treatment strategies of demyelinating and dysmyelinating Charcot-Marie-Tooth disease.

    Hertzog N, Jacob C

    Neural regeneration research 2023; (18(9)):1931-1939 doi:10.4103/1673-5374.367834.

    PMID: 36926710
  3. 3

    Antisense oligonucleotides offer hope to patients with Charcot-Marie-Tooth disease type 1A.

    Shy ME

    The Journal of clinical investigation 2018; (128(1)):110-112.

    PMID: 29199996
  4. 4

    Walking Speed Is Correlated With the Isokinetic Muscular Strength of the Knee in Patients With Charcot-Marie-Tooth Type 1A.

    Reynaud V, Morel C, Givron P, et al.

    American journal of physical medicine & rehabilitation 2019; (98(5)):422-425 doi:10.1097/PHM.0000000000001084.

    PMID: 30365400
  5. 5

    Patient-Reported Symptom Burden of Charcot-Marie-Tooth Disease Type 1A: Findings From an Observational Digital Lifestyle Study.

    Thomas FP, Saporta MA, Attarian S, et al.

    Journal of clinical neuromuscular disease 2022; (24(1)):7-17 doi:10.1097/CND.0000000000000426.

    PMID: 36005469
  6. 6

    A double-blind, placebo-controlled, randomized trial of PXT3003 for the treatment of Charcot-Marie-Tooth type 1A.

    Attarian S, Young P, Brannagan TH, et al.

    Orphanet journal of rare diseases 2021; (16(1)):433 doi:10.1186/s13023-021-02040-8.

    PMID: 34656144

This page provides educational information about Charcot-Marie-Tooth disease type 1A (CMT1A). Always consult your neurologist or a specialized CMT care center for medical advice tailored to your specific condition and before starting any new treatments.

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