Goal 1.

Describe the clinical characteristics of CMT hereditary neuropathy.

Goal 2.

Review the causes of CMT hereditary neuropathy.

Goal 3.

Provide an evaluation strategy to identify the cause of CMT hereditary neuropathy in a proband (when possible).

Goal 4.

Inform genetic counseling of family members of an individual with CMT hereditary neuropathy.

Goal 5.

Review management of CMT hereditary neuropathy.

Clinical Findings

Individuals with CMT manifest symmetric, slowly progressive distal motor neuropathy of the arms and legs usually beginning in the first to third decade and resulting in weakness and atrophy of the muscles in the feet and/or hands. The affected individual typically has distal muscle weakness and atrophy, weak ankle dorsiflexion, depressed tendon reflexes, and pes cavus foot deformity (i.e., high-arched feet).

Muscle weakness is often associated with mild to moderate distal sensory loss. Although usually described as "painless," the neuropathy can be painful [Azevedo et al 2018]. Sensory loss can most easily be demonstrated by a decreased appreciation of vibration, but can also include impaired sensation of pain/pinprick, temperature, and joint position.

Sensorineural hearing loss can occur.

The clinical diagnosis of CMT in a symptomatic person is based on characteristic findings of peripheral neuropathy on medical history and physical examination.

Classification of CMT Type

Traditional classification of CMT (e.g., CMT1, CMT2, and DI-CMT [dominant intermediate]) was based on peripheral neuropathy type as determined by nerve conduction velocity (NCV) and mode of inheritance as determined by family history. As understanding of the genetic basis of CMT gradually evolved, letters in alphabetic order were assigned to the CMT type to represent the gene involved (e.g., CMT1A).

In general the three autosomal dominant neuropathy types based on NCV (normal >40-45 meters/second) were the following [Stojkovic 2016]:

• Demyelinating (CMT1) defined as NCV <35 m/s. The clinical findings of distal muscle weakness and atrophy and sensory loss were usually slowly progressive and often associated with pes cavus foot deformity and bilateral foot drop. Affected individuals usually became symptomatic between ages five and 25 years. Fewer than 5% of individuals became wheelchair dependent. Life span was not shortened.
• Axonal (non-demyelinating) (CMT2) defined as NCV >45m/s. The clinical findings were distal muscle weakness and atrophy. Although axonal peripheral neuropathy shows extensive clinical overlap with demyelinating peripheral neuropathy, in general individuals with axonal neuropathy tended to be less disabled and have less sensory loss than individuals with demyelinating neuropathy.
• Dominant intermediate CMT (DI-CMT) defined as NCV 35-45 m/s. The clinical findings are a relatively typical CMT phenotype. NCVs are so variable that within a family some affected individuals fall in the demyelinating neuropathy range, whereas others fall in the axonal neuropathy range.

Newly proposed CMT naming system. As more genes causing CMT were identified and as the overlap of neuropathy phenotypes and modes of inheritance became apparent, the above alphanumeric classification system proved unwieldy and inadequate. In 2018, Magy et al [2018] proposed a gene-based classification of inherited neuropathies (see Table 4, which includes a comprehensive list of CMT-associated genes and correlation with the alphanumeric classification). An additional advantage of the Magy et al [2018] classification system is that an individual's findings can be described in terms of mode of inheritance, neuropathy type, and gene (see Evaluation Strategies).

Nomenclature

Distal hereditary motor neuropathy (dHMN) and distal spinal muscular atrophy (DSMA) = CMT. In their study of distal hereditary motor neuropathies (the clinically and genetically heterogeneous group of disorders characterized by lower motor neuron dysfunction), Bansagi et al [2017] reported that pathogenic variants in the same genes can cause the phenotypes known as dHMN and DSMA, leading them to conclude that dHMN and motor CMT should not be classified differently.

Dejerine-Sottas syndrome (DSS) originally referred to a severe demyelinating neuropathy of infancy and childhood associated with very slow NCVs, elevated CSF protein, marked clinical weakness, and hypertrophic nerves with onion bulb formation. Although the term "DSS" is still sometimes used to indicate a clinical phenotype, it does not imply an inheritance pattern or a specific genetic defect [Parman et al 2004].

Differential Diagnosis of CMT

CMT – the subject of this overview – needs to be distinguished from the following entities: systemic disorders with neuropathy, other types of hereditary neuropathy (Table1), distal myopathies (Table 2), hereditary sensory neuropathies (HSN), and acquired disorders. Note: These entities are not discussed elsewhere in this overview.

Family History

A three-generation family history with attention to other relatives with neurologic signs and symptoms should be obtained. Documentation of relevant findings in relatives can be accomplished either through direct examination of those individuals or review of their medical records, including the results of molecular genetic testing and EMG and NCV studies.

Individuals with CMT may have a negative family history for many reasons, including mild subclinical expression in other family members, autosomal recessive inheritance, or a de novo heterozygous pathogenic variant in a gene associated with autosomal dominant inheritance [Rudnik-Schöneborn et al 2016] or X-linked inheritance.

Molecular Genetic Testing

Health care providers ordering genetic testing should be familiar with the genetics of CMT. Given the complexity of interpreting genetic test results and their implications for genetic counseling, health care providers should consider referral to a neurogenetics center or a genetic counselor specializing in neurogenetics (see NSGC – Find a Genetic Counselor).

Molecular genetic testing approaches can include gene-targeted testing (single-gene testing, multigene panel) and comprehensive genomic testing (exome sequencing, exome array). Gene-targeted testing requires the clinician to hypothesize which gene(s) are likely involved, whereas genomic testing does not.

Mode of Inheritance

CMT hereditary neuropathy can be inherited in an autosomal dominant, autosomal recessive, or X-linked manner.

Genetic counseling regarding risk to family members depends on accurate diagnosis, determination of the mode of inheritance in each family, and results of molecular genetic testing. Given the complexity of the genetics of CMT, health care providers should consider referring at-risk relatives to a neurogenetics center or genetic counselor specializing in neurogenetics (see NSGC – Find a Genetic Counselor search tool).

Autosomal Dominant Inheritance – Risk to Family Members

Parents of a proband

• Most individuals diagnosed with autosomal dominant CMT have an affected parent.
• Some individuals diagnosed with autosomal dominant CMT have the disorder as the result of a de novo pathogenic variant. The proportion of cases caused by a de novo pathogenic variant varies depending on the involved gene. In a study of 1,206 index cases, Rudnik-Schöneborn et al [2016] identified de novo variants in 1.3% of individuals with a PMP duplication and 25% of those with MPZ variants.
• Molecular genetic testing is recommended for the parents of a proband with an apparent de novo pathogenic variant.
• If the pathogenic variant found in the proband cannot be detected in the leukocyte DNA of either parent, possible explanations include a de novo pathogenic variant in the proband or germline mosaicism in a parent. Germline mosaicism has been reported [Fabrizi et al 2001].
• The family history of some individuals diagnosed with autosomal dominant CMT may appear to be negative because of failure to recognize the disorder in family members, early death of the parent before the onset of symptoms, or late onset of the disease in the affected parent. Therefore, an apparently negative family history cannot be confirmed unless appropriate clinical evaluation and/or molecular genetic testing has been performed on the parents of the proband.

Sibs of a proband. The risk to the sibs of the proband depends on the clinical/genetic status of the proband's parents:

• If a parent of the proband is affected and/or is known to have the pathogenic variant identified in the proband, the risk to the sibs is 50%.
• If the proband has a known CMT-related pathogenic variant that cannot be detected in the leukocyte DNA of either parent, the recurrence risk to sibs is slightly greater than that of the general population because of the possibility of parental germline mosaicism.
• If the parents have not been tested for the pathogenic variant but are clinically unaffected, the risk to the sibs of a proband appears to be low. However, sibs of a proband with clinically unaffected parents are still presumed to be at increased risk for CMT because of the possibility of reduced penetrance in a heterozygous parent or the theoretic possibility of parental germline mosaicism.

Offspring of a proband. Each child of an individual with autosomal dominant CMT has a 50% chance of inheriting the pathogenic variant.

Other family members. The risk to other family members depends on the status of the proband's parents: if a parent has the pathogenic variant, the parent's family members may be at risk.

Autosomal Recessive Inheritance – Risk to Family Members

Parents of a proband

• The parents of an individual diagnosed with autosomal recessive CMT are obligate heterozygotes (i.e., carriers of one pathogenic variant).
• Heterozygotes (carriers) are asymptomatic and are not at risk of developing the disorder.

Sibs of a proband

• At conception, each sib of an affected individual has a 25% chance of being affected, a 50% chance of being an asymptomatic carrier, and a 25% chance of being unaffected and not a carrier.
• Heterozygotes (carriers) are asymptomatic and are not at risk of developing the disorder.

Offspring of a proband. The offspring of an individual with autosomal recessive CMT are obligate heterozygotes (carriers) for a pathogenic variant.

Other family members. Each sib of the proband's parents is at a 50% risk of being a carrier of a pathogenic variant.

Carrier detection. Carrier testing for at-risk relatives requires prior identification of the CMT-related pathogenic variants in the family.

X-Linked Inheritance – Risk to Family Members

Parents of a male proband

• The father of an affected male will not have the disorder nor will he be hemizygous for the pathogenic variant; therefore, he does not require further evaluation/testing.
• In a family with more than one affected individual, the mother of an affected male is an obligate heterozygote. Note: If a woman has more than one affected child and no other affected relatives and if the pathogenic variant cannot be detected in her leukocyte DNA, she most likely has germline mosaicism.
• If a male is the only affected family member (i.e., represents a simplex case), the mother may be a heterozygote or the affected male may have a de novo pathogenic variant, in which case the mother is not heterozygous. The frequency of males with a de novo pathogenic variant is not known.

Parents of a female proband

• A female proband may have inherited the pathogenic variant from either her mother or her father, or the pathogenic variant may be de novo.
• Detailed evaluation of the parents and review of the extended family history may help distinguish probands with a de novo pathogenic variant from those with an inherited pathogenic variant. Molecular genetic testing of the mother (and possibly the father, or subsequently the father) can determine if the pathogenic variant was inherited.

Sibs of a male proband. The risk to sibs depends on the genetic status of the mother.

• If the mother of the proband has a pathogenic variant, the chance of transmitting it in each pregnancy is 50%. Males who inherit the pathogenic variant will be affected; females who inherit the pathogenic variant will be heterozygotes and may or may not be affected.
• If the proband represents a simplex case (i.e., a single occurrence in a family) and if the pathogenic variant cannot be detected in the leukocyte DNA of the mother, the recurrence risk to sibs is low but greater than that of the general population because of the theoretic possibility of germline mosaicism.

Sibs of a female proband. The risk to sibs depends on the genetic status of the parents.

• If the mother of the proband has a pathogenic variant, the chance of transmitting it in each pregnancy is 50%. Males who inherit the pathogenic variant will be affected; females who inherit the pathogenic variant will be heterozygotes (carriers) and may or may not be affected.
• If the father of the proband has a pathogenic variant, he will transmit it to all of his daughters and none of his sons.
• If the proband represents a simplex case (i.e., a single occurrence in a family) and if the pathogenic variant cannot be detected in the leukocyte DNA of either parent, the recurrence risk to sibs is low but greater than that of the general population because of the theoretic possibility of germline mosaicism.

Offspring of a proband

• Affected males transmit the pathogenic variant to all of their daughters and none of their sons.
• Heterozygous females have a 50% chance of transmitting the pathogenic variant to each child; sons who inherit the pathogenic variant will be affected; daughters may or may not be affected.

Other family members. If a parent of the proband also has a pathogenic variant, the parent's female family members may be at risk of being heterozygotes (asymptomatic or symptomatic) and the parent's male family members may be at risk of being affected depending on their genetic relationship to the proband.

Note: Molecular genetic testing may be able to identify the family member in whom a de novo pathogenic variant arose, information that could help determine genetic risk status of the extended family.

Heterozygote detection. Molecular genetic testing of at-risk female relatives to determine their genetic status is most informative if the pathogenic variant has been identified in the proband.

Related Genetic Counseling Issues

Predictive testing (i.e., testing of asymptomatic at-risk individuals)

• Predictive testing for at-risk relatives is possible once the CMT-related pathogenic variant has been identified in an affected family member.
• Potential consequences of such testing (including, but not limited to, socioeconomic changes and the need for long-term follow up and evaluation arrangements for individuals with a positive test result) as well as the capabilities and limitations of predictive testing should be discussed in the context of formal genetic counseling prior to testing.

Predictive testing in minors (i.e., testing of asymptomatic at-risk individuals younger than age 18 years)

• For asymptomatic minors at risk for adult-onset conditions for which early treatment would have no beneficial effect on disease morbidity and mortality, predictive genetic testing is considered inappropriate, primarily because it negates the autonomy of the child with no compelling benefit. Further, concern exists regarding the potential unhealthy adverse effects that such information may have on family dynamics, the risk of discrimination and stigmatization in the future, and the anxiety that such information may cause.
• For more information, see the National Society of Genetic Counselors position statement on genetic testing of minors for adult-onset conditions and the American Academy of Pediatrics and American College of Medical Genetics and Genomics policy statement: ethical and policy issues in genetic testing and screening of children.

In a family with an established diagnosis of CMT it is appropriate to consider testing of symptomatic individuals regardless of age.

Considerations in families with an apparent de novo pathogenic variant. When neither parent of a proband with an autosomal dominant or X-linked condition has the pathogenic variant identified in the proband or clinical evidence of the disorder, the pathogenic variant is likely de novo. However, non-medical explanations including alternate paternity or maternity (e.g., with assisted reproduction) and undisclosed adoption could also be explored.

Family planning

• The optimal time for determination of genetic risk and discussion of the availability of prenatal/preimplantation genetic testing is before pregnancy.
• It is appropriate to offer genetic counseling (including discussion of potential risks to offspring and reproductive options) to young adults who are affected or at risk.

DNA banking. Because it is likely that testing methodology and our understanding of genes, pathogenic mechanisms, and diseases will improve in the future, consideration should be given to banking DNA from probands in whom a molecular diagnosis has not been confirmed (i.e., the causative pathogenic mechanism is unknown). For more information, see Huang et al [2022].

Prenatal Testing and Preimplantation Genetic Testing

Once the CMT-related pathogenic variant(s) have been identified in an affected family member, prenatal and preimplantation genetic testing are possible.

Differences in perspective may exist among medical professionals and within families regarding the use of prenatal testing. While most centers would consider use of prenatal testing to be a personal decision, discussion of these issues may be helpful.

Treatment of Manifestations

Reviews of treatment approaches to CMT [Carter et al 2008, Young et al 2008, Reilly & Shy 2009, Corrado et al 2016] as well as reviews of the diagnosis, natural history, and management of CMT [Pareyson & Marchesi 2009a, Pareyson & Marchesi 2009b, Cornett et al 2017, Sivera Mascaró et al 2024] are available. Guidelines for the management of the pediatric population with CMT have been published [Yiu et al 2022].

Treatment is symptomatic. Affected individuals are often evaluated and managed by a multidisciplinary team that includes neurologists, physiatrists, orthopedic surgeons, and physical and occupational therapists [Grandis & Shy 2005, McCorquodale et al 2016].

Quality of life and defining disability have been measured and compared among various groups of individuals with CMT [Burns et al 2010, Ramchandren et al 2015]. Persistent weakness of the hands and/or feet has important career and employment implications; anticipatory counseling is appropriate.

Special shoes, including those with good ankle support, may be needed. Affected individuals often require ankle/foot orthoses (AFOs) to correct foot drop and aid walking. Night splints have not improved ankle range of motion [Refshauge et al 2006, Kenis-Coskun & Matthews 2016].

Some individuals require forearm crutches or canes for gait stability; fewer than 5% of individuals need wheelchairs.

Daily heel cord stretching exercises to prevent Achilles tendon shortening are desirable, as well as gripping exercises for hand weakness [Vinci et al 2005b].

Exercise is encouraged within the individual's capability and many individuals remain physically active [Sman et al 2015].

Orthopedic surgery may be required to correct severe pes cavus deformity [Guyton 2006, Casasnovas et al 2008, Ward et al 2008]. Surgery is sometimes required for hip dysplasia [Chan et al 2006].

The cause of any pain should be identified as accurately as possible [Padua et al 2006].

• Musculoskeletal pain may respond to acetaminophen or nonsteroidal anti-inflammatory agents [Carter et al 1998].
• Neuropathic pain may respond to tricyclic antidepressants or drugs such as carbamazepine or gabapentin.

Modafinil has been used to treat fatigue [Carter et al 2006].

Those at increased risk for vocal cord paralysis (see Table 4) warrant consultation with specialists in otolaryngology at the time of diagnosis; evidence of vocal cord paralysis (hoarseness and/or stridor) at any time warrants periodic monitoring by specialists in otolaryngology to detect vocal cord hypomotility and quantify the degree of airway obstruction, a potentially lethal complication [Zambon et al 2017].

In a study of five individuals with CMT-associated sensorineural hearing loss and auditory neuropathy spectrum disorder, Farber et al [2024] found that cochlear implants were safe and reliable and improved both hearing and speech. Note: Four of the described individuals were from a family with the PMP22 pathogenic variant c.199G>C (p.Ala67Pro) [Kovach et al 1999].

Agents/Circumstances to Avoid

Obesity is to be avoided because it makes walking more difficult.

Medications that are toxic or potentially toxic to persons with CMT comprise a spectrum of risk ranging from definite high risk to negligible risk. See the Charcot-Marie-Tooth Association website (pdf) for an up-to-date list.

Chemotherapy for cancer that includes vincristine may be especially damaging to peripheral nerves and severely worsen CMT [Graf et al 1996, Nishikawa et al 2008].

Pregnancy Management

CMT appears to be an independent risk factor for maternal complications during pregnancy and delivery [Pisciotta et al 2020]. In a study of 157 deliveries in 193 pregnancies Pisciotta et al found that:

• In 9.3% of pregnancies, new manifestations of CMT can appear and existing manifestations (including reduced strength and sensitivity, cramps, and pain) can worsen, and may persist following pregnancy;
• Placenta previa (1.6%) abnormal nonvertex presentation (8.4%), and preterm delivery (20.3%) occurred more frequently in the pregnancies of mothers with CMT.

Revision History

• 14 March 2024 (tb) Revision: information regarding cochlear implants added to Management; clinical practice guidelines [Sivera Mascaró et al 2024] added to Management
• 23 February 2023 (tb) Revision: SARS1 added to Table 4 [He et al [2023]
• 29 September 2022 (tb) Revision: Setlere et al [2022] added to Table 4 (AARS1)
• 24 February 2022 (tb) Revision: added Yiu et al [2022] guidelines for pediatric management
• 9 September 2021 (tb) Revision: added comment on SPTLC1 in Table 4 [Johnson et al 2021]
• 20 May 2021 (tb) Revision: CADM3 added to Table 4 [Rebelo et al 2021]
• 18 March 2021 (tb) Revision: VWA1 added to Table 4
• 4 March 2021 (tb) Revision: Pregnancy Management section added [Pisciotta et al 2020]
• 14 May 2020 (tb) Revision: SORD added to Table 4 [Cortese et al 2020]
• 2 January 2020 (tb) Revision: correction (PNKP) to Table 4 [Leal et al 2018]
• 12 December 2019 (aa) Revision: information on GJB1 added to Table 4
• 24 January 2019 (aa) Revision: gene (PMP2) added to Table 4
• 28 June 2018 (bp) Comprehensive update posted live
• 31 May 2011 (me) Comprehensive update posted live
• 31 August 2007 (me) Comprehensive update posted live
• 27 April 2005 (me) Comprehensive update posted live
• 28 March 2003 (me) Comprehensive update posted live
• 20 June 2001 (me) Comprehensive update posted live
• 28 September 1998 (pb) Overview posted live
• April 1996 (tb) Original submission

Published Guidelines / Consensus Statements

• Committee on Bioethics, Committee on Genetics, and American College of Medical Genetics and Genomics Social, Ethical, Legal Issues Committee. Ethical and policy issues in genetic testing and screening of children. Available online. 2013. Accessed 5-30-23.
• National Society of Genetic Counselors. Position statement on genetic testing of minors for adult-onset conditions. Available online. 2018. Accessed 5-30-23.

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