Charcot-Marie-Tooth disease caused by mutation in LRSAM1 is a rare, inherited nerve disease. The full technical name is Charcot-Marie-Tooth disease axonal type 2P (CMT2P). It mainly damages the long nerves in the legs and arms. These nerves control movement (motor) and feeling (sensory), so both strength and sensation can be affected. Genetic Rare Diseases Center+1
Charcot–Marie–Tooth disease caused by mutation in the LRSAM1 gene is a rare, inherited nerve disease. Doctors call it Charcot–Marie–Tooth disease type 2P (CMT2P). It mainly damages the long nerves to the feet, legs, hands, and sometimes arms. These nerves slowly lose their function, so muscles become weak and thin and feeling in the skin is reduced.Genetic Rare Diseases Center+2MalaCards+2 The LRSAM1 gene gives instructions to make a protein that works as an E3 ubiquitin ligase. This protein helps cells label damaged or extra proteins so they can be broken down and removed. When LRSAM1 is changed (mutated), this “clean-up” process does not work well in nerve cells. Over time, the long axons of the nerves are injured and cannot carry electrical signals properly, which leads to an axonal neuropathy.Springer Link+1
In this disease, the problem comes from a change (mutation) in a gene called LRSAM1 on chromosome 9. This gene makes a protein that works as an E3 ubiquitin ligase, which helps label other proteins so the cell can handle or remove them. When LRSAM1 is faulty, nerve cells cannot keep their internal proteins healthy, and the long axons slowly degenerate. Springer Link+1
CMT2P is an axonal neuropathy. That means the main damage is in the long “wire” part of the nerve (the axon), not in the myelin coating. It usually starts in the feet and legs and slowly moves upward. Some people have only mild problems, while others develop more serious weakness and disability over many years. MalaCards+1
CMT2P can be inherited in an autosomal dominant or autosomal recessive way. In dominant families, one mutated copy from one parent is enough to cause disease. In recessive families, a person needs two mutated copies, one from each carrier parent. Age at onset is often in adolescence or adulthood, and progression is usually slow. Genetic Rare Diseases Center+1
Other names
This condition has several other names used in medical articles and rare disease databases. They all describe the same basic disorder. Common alternative names include: Charcot-Marie-Tooth disease axonal type 2P, Charcot-Marie-Tooth disease type 2P, Charcot-Marie-Tooth disease caused by mutation in LRSAM1, Charcot-Marie-Tooth neuropathy type 2P, Charcot-Marie-Tooth neuropathy type 2G (now reclassified as 2P), CMT2P, and LRSAM1-related Charcot-Marie-Tooth disease. Genetic Rare Diseases Center+2National Organization for Rare Disorders+2
Types
Doctors sometimes talk about “types” or “sub-types” inside LRSAM1-related CMT2P. These are not completely separate diseases, but they describe patterns seen in different families. Springer Link+1
One way to group types is by inheritance pattern. In autosomal dominant CMT2P, many people in several generations are affected, and each child of an affected parent has a 50% chance to inherit the mutation. In autosomal recessive CMT2P, affected people usually have healthy carrier parents, and disease appears when a child gets two mutated copies. Genetic Rare Diseases Center+1
Another way is by age at onset. Some families show early-onset disease in childhood or the teen years. Others have typical adult-onset disease in the 20s–40s. A few reported families show very late onset. Even inside one family, some people can start earlier or later, so age at onset is a “type” but with overlap. Institut Myologie+1
A third way is by severity pattern. Many LRSAM1 cases have mild to moderate, very slowly progressive weakness and sensory loss, and some people never need a wheelchair. Others develop marked sensory ataxia, neuropathic pain, or stronger disability. These patterns are linked partly to which exact mutation is present and where it lies in the LRSAM1 protein, especially in the RING domain. Springer Link+1
Causes (and genetic risk factors)
In simple terms, there is one direct cause of this disease: a harmful mutation in the LRSAM1 gene. All other “causes” are really ways this mutation appears or is passed on, or factors that make those gene changes more likely.
Pathogenic LRSAM1 mutation
The core cause is a disease-causing change in the LRSAM1 gene. This mutation changes the protein so it cannot work correctly as an E3 ubiquitin ligase. As a result, long peripheral nerves slowly degenerate, causing the typical motor and sensory neuropathy of CMT2P. Springer Link+1Autosomal dominant inheritance from an affected parent
In many families, an affected parent passes one mutated LRSAM1 copy to a child. One bad copy and one normal copy are enough to cause disease (dominant inheritance). Each child then has a 50% chance to inherit the same mutation. Genetic Rare Diseases Center+1Autosomal recessive inheritance from two carrier parents
In some families, both parents are healthy carriers with one mutated and one normal LRSAM1 gene. A child who inherits both mutated copies will develop CMT2P (recessive inheritance). Carrier parents usually have no or only very mild symptoms. Genetic Rare Diseases Center+1De novo (new) LRSAM1 mutation
Sometimes, the LRSAM1 mutation appears for the first time in a child, with no family history. This can happen due to a random error when the parents’ egg or sperm cells are formed. The child then becomes the first affected person in the family and can pass it on. Genetic Rare Diseases Center+1Frameshift mutations
Some families have frameshift mutations that shift the reading frame of the LRSAM1 gene. This usually creates an abnormal or truncated protein that cannot perform its tagging function on other proteins, leading to axonal damage. OUP Academic+1Nonsense (stop) mutations
A nonsense mutation introduces an early “stop” signal in the LRSAM1 gene. This shortens the protein and often triggers the cell to destroy the faulty message, leaving nerve cells without enough working LRSAM1 protein and promoting neuropathy. PLOS+1Missense mutations in the RING domain
Some mutations change a single amino acid in the crucial RING domain of LRSAM1. The RING domain is the heart of the E3 ligase activity. Even a single amino-acid change there can greatly reduce its ability to tag proteins, leading to CMT2P. Springer Link+1Splice-site mutations
Splice-site mutations affect how the cell cuts and joins the RNA pieces of the LRSAM1 gene. Mis-splicing can remove or insert parts of the protein, again damaging its function and causing axonal neuropathy. PLOS+1Large deletions or duplications of LRSAM1
In some hereditary neuropathies, whole sections of genes are lost (deletion) or repeated (duplication). Similar structural changes involving LRSAM1 can change how much protein is made or how it is assembled, increasing disease risk. MalaCards+1Founder mutations in specific populations
Several families from particular regions (for example, French or Sardinian families) share the same LRSAM1 mutation, suggesting a founder effect. In these groups, people are more likely to inherit the same historical mutation from a distant common ancestor. Institut Myologie+1Consanguinity (parents related by blood)
When parents are blood relatives, there is a higher chance they both carry the same rare recessive LRSAM1 variant. In such families, children have a higher chance of inheriting two mutated copies and developing recessive CMT2P. Genetic Rare Diseases Center+1Random errors in DNA copying
Human cells copy DNA billions of times. Very rarely, errors happen when genes like LRSAM1 are copied in egg or sperm cells. Most errors are harmless, but some may hit important parts of the gene and become a disease-causing mutation. Genetic Rare Diseases Center+1Environmental mutagens (for example, radiation)
Strong ionizing radiation or other mutagens can damage DNA and occasionally create new mutations. While this is not a common or proven specific trigger for LRSAM1 mutations, it is one possible general pathway by which genetic changes might arise. Genetic Rare Diseases Center+1Viruses and other biological agents that damage DNA
Some infections can cause DNA damage or increase cell stress. Over time, such damage could contribute to new mutations in genes like LRSAM1, though this is a theoretical risk rather than a common, proven cause for this exact disease. Genetic Rare Diseases Center+1Ultraviolet (UV) radiation
UV light is well-known to damage DNA in skin cells and can cause mutations. In theory, long-term exposure could contribute to mutations in germ cells, including in genes like LRSAM1, although this is not a specific, proven event in reported CMT2P families. Genetic Rare Diseases Center+1Germline mosaicism in a parent
Sometimes, a parent has a mutation only in some egg or sperm cells but not in their own blood cells. This is called germline mosaicism. It can make a family look like there is a “new” mutation in one child, even though the parent silently carried it in their germ cells. Europe PMC+1General genetic susceptibility background
The effect of an LRSAM1 mutation can be influenced by other genes that control nerve health and repair. These “modifier genes” do not cause the disease by themselves but can make the neuropathy milder or more severe. Springer Link+1Family history of Charcot-Marie-Tooth disease
A family history of CMT or of a “hereditary neuropathy” is a strong sign that an underlying gene such as LRSAM1 may be mutated. The presence of affected relatives does not cause the disease directly, but it signals that disease-causing variants may be present in the family gene pool. Mayo Clinic+1Co-existing genetic neuropathy genes
Some people may carry mutations in more than one neuropathy gene (for example, another CMT-related gene plus LRSAM1). This can modify the clinical picture, age at onset, or severity. Such complex cases are rare but are now being found more often with next-generation sequencing. Europe PMC+1General background rate of genetic disease mutations in the population
On a population level, a small baseline rate of new disease mutations appears in each generation. LRSAM1 is one of many genes in which such rare pathogenic variants can arise, explaining why CMT2P is very uncommon but continues to be identified in new families worldwide. Genetic Rare Diseases Center+1
Symptoms
Symptoms can vary widely, even within one family. But some patterns are typical and help doctors suspect CMT2P.
Distal muscle weakness in feet and legs
Many people first notice weakness in the muscles that lift the foot and move the ankle. They may have trouble running, climbing stairs, or standing on their heels. This distal pattern is classic for axonal CMT, including LRSAM1-related disease. Genetic Rare Diseases Center+2MalaCards+2Muscle wasting (distal amyotrophy)
Over time, the small muscles of the feet, calves, and sometimes hands become thin and wasted. The legs can look like an “inverted champagne bottle” with thin calves. This loss of bulk reflects long-term axonal degeneration to those muscles. Genetic Rare Diseases Center+2MalaCards+2Distal sensory loss
People often lose feeling in the toes, feet, and sometimes fingertips. They may not feel vibration, light touch, or pain as clearly. Sensory loss is usually “length-dependent,” meaning it starts farthest from the spine and moves upward slowly. Genetic Rare Diseases Center+2MalaCards+2Loss of vibration sense
A very typical finding is reduced ability to feel vibration from a tuning fork at the ankles or toes. This reflects damage to large sensory fibers that carry vibration and position information, which are often affected in CMT2P. Genetic Rare Diseases Center+2MalaCards+2Foot drop and foot dorsiflexor weakness
Weakness of the muscles that lift the foot causes “foot drop.” The toes drag on the floor, and people may trip easily. They may have difficulty walking on their heels and may need to lift the knee higher than normal to avoid catching the toes. Genetic Rare Diseases Center+2MalaCards+2Steppage gait and balance problems
Because of foot drop and sensory loss, people often develop a high-stepping gait. They may feel unsteady, especially in the dark or on uneven ground. Some families with LRSAM1 mutations have prominent sensory ataxia, meaning balance problems due to poor joint-position sense. Genetic Rare Diseases Center+2Institut Myologie+2Pes cavus (high-arched feet) and hammertoes
Over time, muscle imbalance in the feet causes structural changes. High arches (pes cavus) and bent toes (hammertoes) are common in many CMT types, including CMT2P. These deformities can make shoe fitting difficult and increase the risk of calluses and pressure sores. Genetic Rare Diseases Center+2MalaCards+2Muscle cramps and fasciculations (twitches)
Young patients may complain of painful leg or foot cramps, especially after activity. Small, brief muscle twitches (fasciculations) in calves or feet can also appear. These features reflect irritable and unhealthy motor units within the affected peripheral nerves. Genetic Rare Diseases Center+2MalaCards+2Hand weakness and fine-motor difficulty
In older or more advanced cases, weakness and wasting can spread to the hands. People may struggle with buttons, zippers, handwriting, or tasks requiring fine finger control. This upper-limb involvement usually appears later than leg symptoms. MalaCards+2Mayo Clinic+2Hyporeflexia or areflexia (reduced or absent reflexes)
Doctors often find that ankle and sometimes knee reflexes are reduced or absent. This is because the reflex arc depends on fast large fibers that are damaged in axonal neuropathies like CMT2P. Loss of reflexes supports a peripheral nerve cause. Genetic Rare Diseases Center+2MalaCards+2Neuropathic pain, burning, or tingling
Some people with LRSAM1 mutations report painful burning, tingling, or electric-shock sensations in their feet or legs. This neuropathic pain reflects abnormal firing of damaged sensory fibers. In some reported families, pain is a prominent feature. Institut Myologie+2Mayo Clinic+2Fatigue and reduced endurance
Chronic weakness and sensory loss make walking and standing more tiring. People may feel exhausted after short walks, need more rest, or avoid standing for long periods. This fatigue is often overlooked but greatly affects quality of life. Mayo Clinic+2Europe PMC+2Clumsiness and frequent tripping
Children or young adults may be described as “clumsy” at sports or running. They may trip over small obstacles or uneven ground because they cannot lift their feet well or feel the ground clearly. This is often one of the earliest real-life signs. Mayo Clinic+2Genetic Rare Diseases Center+2Autonomic symptoms (for example, urinary urgency or erectile dysfunction)
Some CMT2P patients have mild autonomic problems such as urinary urgency or erectile dysfunction. These symptoms show that the disease can occasionally affect small autonomic fibers, although this is not always present. MalaCards+2Springer Link+2Slow, progressive course over many years
A key feature is the very slow progression. Symptoms usually worsen over decades, not weeks or months. Some people remain able to walk independently all their life; others may eventually need aids. The slow course helps doctors distinguish CMT2P from rapidly progressive acquired neuropathies. MalaCards+2PubMed+2
Diagnostic tests
Diagnosis combines clinical exam, electrical studies, and genetics. Many of the tests below are also used for other neuropathies; what makes the diagnosis “LRSAM1-related CMT2P” is mainly the genetic result.
Physical examination tests
General neurological examination of strength, reflexes, and sensation
The doctor checks muscle strength in feet, legs, hands, and arms; tests tendon reflexes at ankles and knees; and checks sensation to touch, vibration, and pain. Distal weakness, loss of reflexes, and length-dependent sensory loss point to an axonal peripheral neuropathy like CMT2P. Genetic Rare Diseases Center+2Mayo Clinic+2Gait observation (including steppage gait)
The doctor watches how the person walks, turns, and runs. A high-stepping gait, difficulty with heel walking, or frequent tripping suggests foot drop from distal weakness. This pattern is classic in many CMT types, including LRSAM1-related neuropathy. Genetic Rare Diseases Center+2MalaCards+2Foot and hand inspection for deformities
The examiner looks at the shape of the feet and toes, checking for pes cavus, hammertoes, and muscle wasting. They also inspect hand muscles for thinning. These deformities develop slowly and support a chronic hereditary neuropathy. Genetic Rare Diseases Center+2MalaCards+2Romberg test for balance and joint-position sense
During the Romberg test, the person stands with feet together and then closes their eyes. If they sway or fall, it suggests impaired proprioception from large sensory fiber damage, which is common in CMT2P with sensory ataxia. Institut Myologie+2Europe PMC+2Timed walking and functional mobility tests
Simple clinic tests such as timed 10-meter walk, timed up-and-go, or heel-to-toe walking measure how weakness and sensory loss affect function. Worsening times over years can track disease progression in CMT2P. Springer Link+2Europe PMC+2
Manual tests
Manual muscle testing (MRC grading)
The clinician pushes against the person’s feet, legs, and hands to grade strength on the Medical Research Council (MRC) scale from 0 to 5. Weakness that is strongest in distal muscles, with relatively preserved proximal muscles, is typical of axonal CMT. Europe PMC+2Springer Link+2Vibration sense testing with a tuning fork
A 128-Hz tuning fork is placed on bony points at the toes and ankles. People with CMT2P often feel the vibration weakly or lose it earlier than normal. This is a simple bedside test for large fiber damage. Genetic Rare Diseases Center+2MalaCards+2Light touch and pinprick testing
The doctor gently touches the skin with cotton, a blunt pin, or a disposable neurotip. Reduced feeling in a “stocking-and-glove” pattern confirms distal sensory loss, which is expected in LRSAM1-related neuropathy. Genetic Rare Diseases Center+2MalaCards+2Joint-position sense testing
The clinician moves the person’s big toe or finger up and down and asks them to say which direction it moved, with eyes closed. Failure to identify the movement shows impaired proprioception, common in CMT2P with sensory ataxia. Institut Myologie+2MalaCards+2Manual testing of coordination (for example, heel-to-shin)
Tests like sliding the heel along the opposite shin help assess coordination. In CMT2P, difficulty often comes from impaired sensation rather than a brain problem, and it worsens when vision is removed. This helps separate sensory ataxia from cerebellar disease. Institut Myologie+2Europe PMC+2
Lab and pathological tests
Genetic testing panel for Charcot-Marie-Tooth disease
A blood or saliva sample is sent for next-generation sequencing of many neuropathy genes, including LRSAM1. Finding a pathogenic LRSAM1 variant in someone with compatible symptoms strongly confirms the diagnosis of CMT2P. MalaCards+2PLOS+2Targeted LRSAM1 sequencing and copy-number analysis
If CMT2P is strongly suspected or a family mutation is known, the lab can focus directly on the LRSAM1 gene, using sequencing and methods that detect deletions or duplications. This test is essential for family counseling and cascade testing. Springer Link+2Nature+2Blood tests to rule out other causes of neuropathy
Tests such as fasting glucose, HbA1c, vitamin B12, thyroid function, kidney and liver function, and serum protein electrophoresis help exclude common acquired neuropathies (for example, diabetic or nutritional neuropathy). A normal set of results supports a hereditary cause like CMT2P. Mayo Clinic+2Europe PMC+2Nerve biopsy (for example, sural nerve)
In difficult cases, a small piece of nerve from the ankle may be removed and examined under the microscope. In axonal CMT2, biopsy shows chronic axonal loss and secondary changes. Biopsy is used less often today because genetic testing is safer and more specific. Europe PMC+2Springer Link+2Cerebrospinal fluid (CSF) analysis
A lumbar puncture to test CSF is not routinely needed for CMT2P, but it can help rule out inflammatory neuropathies (like CIDP) when the picture is unclear. Normal or mildly changed CSF supports a hereditary, non-inflammatory cause. Europe PMC+2Mayo Clinic+2
Electrodiagnostic tests
Nerve conduction studies (NCS)
Electrodes are placed on the skin, and small electrical pulses are given to measure how fast and how strongly nerves conduct. In CMT2P, conduction velocities are often near normal or only mildly slowed, but amplitudes are reduced, showing axonal loss rather than major myelin damage. Europe PMC+2Springer Link+2Electromyography (EMG)
A fine needle electrode is inserted into muscles to record their electrical activity. EMG in CMT2P usually shows denervation changes in distal muscles, such as large motor units and reduced recruitment, indicating chronic axonal neuropathy. Europe PMC+2Springer Link+2F-wave and late response studies
F-waves test conduction along the whole length of the motor nerve to the spinal cord and back. In CMT2P, F-waves may show changes consistent with length-dependent axonal damage. These detailed studies help characterize the neuropathy pattern. Europe PMC+2Springer Link+2Somatosensory evoked potentials (SSEPs)
SSEPs measure the brain’s response to repeated sensory stimulation of a nerve. In CMT2P with strong sensory involvement or ataxia, SSEPs can show delayed or reduced signals, confirming dysfunction along the sensory pathways. Institut Myologie+2Europe PMC+2
Imaging tests
MRI of leg muscles to show patterns of denervation
MRI of calf and thigh muscles can show a typical pattern of fatty replacement and muscle atrophy in hereditary neuropathies. In families with LRSAM1 mutations, certain MRI patterns have helped re-classify older “CMT2G” cases as CMT2P, supporting the specific diagnosis. Idival+2Springer Link+2
Non-pharmacological treatments
Below are 20 important non-drug treatments. Almost all people with CMT benefit from a combination of these methods, chosen by a neurologist, physiatrist, physical therapist, and occupational therapist.Charcot-Marie-Tooth Association+4Muscular Dystrophy Association+4PMC+4
Regular physical therapy
Physical therapy uses gentle exercises and stretches to keep muscles strong and flexible. The purpose is to slow muscle wasting, delay joint stiffness, and improve walking. The therapist focuses on low-impact exercises to avoid over-tiring weak muscles. This helps nerves and muscles work together better and may reduce falls and pain over time.Muscular Dystrophy Association+1Stretching and range-of-motion exercises
Daily stretching of ankles, knees, hips, fingers, and wrists helps prevent contractures (permanent stiffness). The purpose is to keep joints moving smoothly. Stretching gently lengthens muscles and tendons, reduces spasms, and spreads joint fluid more evenly, which can ease pain and make walking and hand use smoother.Muscular Dystrophy Association+1Strength training with low resistance
Carefully planned strengthening exercises try to maintain as much muscle power as possible without damaging weak nerves. The purpose is to support the joints and improve endurance. Low weights, resistance bands, or body-weight exercises are used, with many rest breaks. This helps muscles work more efficiently and can improve balance and walking speed.Charcot-Marie-Tooth Disease+1Balance and coordination training
Special exercises such as standing on one leg (with support), walking on different surfaces, or using balance boards help the brain and body adapt to reduced sensation in the feet. The purpose is to reduce falls. These exercises stimulate the remaining sensory pathways and help the brain relearn how to control posture with less feedback from the feet.Charcot-Marie-Tooth Disease+1Gait training
Gait training is focused practice in walking safely and efficiently, sometimes on a treadmill or over obstacles. The purpose is to improve foot placement, step length, and rhythm. Therapists teach strategies like lifting the knees more to reduce “foot drop.” Over time, this retrains walking patterns and can reduce energy use and fatigue.Charcot-Marie-Tooth Disease+1Ankle-foot orthoses (AFOs) and other braces
AFOs are plastic or carbon-fiber braces that support the foot and ankle. The purpose is to prevent the foot from dropping, reduce tripping, and stabilize weak ankles. By holding the foot in a more normal position, AFOs improve the mechanics of walking and can prevent contractures and deformities in the long term.Mayo Clinic+2Charcot-Marie-Tooth Association+2Custom shoes and insoles
Many people with CMT develop high arches, hammertoes, and pressure points. Custom shoes, inserts, or rocker-bottom soles spread pressure more evenly and improve comfort. The purpose is to prevent skin breakdown, ulcers, and pain. Better foot alignment also improves balance and reduces stress on knees and hips.Mayo Clinic+2Charcot-Marie-Tooth Association+2Hand splints and thumb supports
Weak hand and thumb muscles make it hard to grip and pinch. Light splints can support the thumb in a stronger position and prevent joint collapse. The purpose is to improve hand function for writing, eating, and buttoning clothes. Splints work by aligning the small joints and giving the muscles a mechanical advantage.Mayo Clinic+1Occupational therapy (OT)
OT teaches practical ways to manage daily activities like dressing, bathing, writing, and computer use. The purpose is to maintain independence. Therapists may suggest adapted tools (larger handles, button hooks, special keyboards) and joint-saving techniques. This reduces strain on weak muscles and helps people keep working and studying.Orange County Orthopedic Group+1Assistive devices (cane, walker, wheelchair when needed)
Using a cane, crutches, or a walker can make walking safer and less tiring. In advanced stages, some people need a wheelchair for long distances. The purpose is to prevent falls, fractures, and exhaustion. These devices shift some of the load from weak legs to stronger arms or wheels, allowing people to stay active for more years.Muscular Dystrophy Association+1Aquatic (water) therapy
Exercise in warm water supports body weight and makes movements easier. The purpose is to improve strength, flexibility, and balance with less pain and risk of falls. Water provides gentle resistance in all directions, so many muscle groups work at the same time while the joints are protected.Charcot-Marie-Tooth Disease+1Heat and cold therapy
Warm packs or baths can relax stiff muscles and improve blood flow, while cold packs can reduce painful inflammation after activity. The purpose is short-term pain relief. Heat may decrease muscle spasm, and cold slows nerve conduction in overly active pain fibers, so pain signals are weaker.UVA Health+1Transcutaneous electrical nerve stimulation (TENS)
TENS uses small electrical currents on the skin to help control pain. The purpose is to reduce neuropathic pain without more medicine. The current may “distract” the nervous system by activating non-painful nerve fibers and triggering the release of natural pain-relieving chemicals in the spinal cord.PMC+1Ergonomic adjustments at home and work
Simple changes like raised chairs, grab bars, handrails, anti-slip mats, and rearranged furniture can reduce efforts and fall risk. The purpose is safe independence. Good ergonomics lower the strain on weak hands and legs and reduce the number of times a person must climb stairs or carry heavy loads.Orange County Orthopedic Group+1Fall-prevention and home safety programs
A nurse or therapist can walk through the home to identify hazards such as loose rugs, poor lighting, or narrow pathways. The purpose is to prevent injuries, which can be serious in people with weak muscles. Removing obstacles and adding simple aids makes every movement safer and more confident.Muscular Dystrophy Association+1Pain-management education and relaxation techniques
Chronic pain is common in CMT. Learning breathing exercises, relaxation, mindfulness, or cognitive-behavior therapy can change how the brain reacts to pain signals. The purpose is to lower the impact of pain on sleep, mood, and daily life. These methods reduce stress hormones and can calm overactive pain pathways.PMC+1Psychological support and counseling
Living with a life-long nerve disease can cause anxiety, sadness, or frustration. Counseling provides emotional support and problem-solving skills. The purpose is to protect mental health and motivation. Good mood and coping skills help people follow exercise programs and stay engaged in school, work, and relationships.PMC+1Genetic counseling for patients and families
Genetic counselors explain how LRSAM1 mutations are inherited, what tests are available, and what the risks are for children or siblings. The purpose is informed family planning and early diagnosis. Counseling also helps families understand that CMT is not caused by anything they “did wrong.”MalaCards+2Monarch Initiative+2Patient education and support groups
Learning about CMT2P, staying updated on research, and talking with other patients reduces fear and isolation. The purpose is empowerment. Support groups share practical tips about braces, schools, careers, and mental health, and connect people to clinical trials and expert centers.PMC+2Charcot-Marie-Tooth Disease+2Regular monitoring by a neuromuscular specialist
Routine follow-up allows early treatment of new problems such as worsening foot deformity, breathing issues, or severe pain. The purpose is to adjust braces, therapy, and medicines over time. Early action can prevent complications and keep quality of life as high as possible.PMC+2Muscular Dystrophy Association+2
Drug treatments
There is no approved drug that corrects the LRSAM1 mutation or fully stops CMT2P. Medicines are used mainly to treat neuropathic pain, muscle cramps, mood problems, and sleep issues. Most of the drugs below are approved by the U.S. FDA for neuropathic pain or related conditions, and their full labels can be read on accessdata.fda.gov; here I summarize them in simple language and NOT as personal dosing advice. Always follow your own doctor’s instructions.FDA Access Data+3PMC+3NCBI+3
Pregabalin (Lyrica)
Pregabalin is an anti-seizure medicine widely used for neuropathic pain. It reduces the release of pain-signaling chemicals by binding to calcium channels in nerve cells. Typical adult neuropathic-pain doses are around 150–300 mg per day in 2–3 divided doses, adjusted by the doctor and kidney function. It may cause dizziness, sleepiness, weight gain, and leg swelling.Drugs.com+4FDA Access Data+4FDA Access Data+4Gabapentin (Neurontin)
Gabapentin is another anti-seizure drug used off-label for neuropathic pain and on-label for post-herpetic neuralgia. It works similarly to pregabalin by calming over-active nerve cells. Adult doses are usually slowly increased up to about 1800–3600 mg per day in three doses. Side effects include dizziness, tiredness, and swelling.FDA Access Data+2FDA Access Data+2Duloxetine (Cymbalta)
Duloxetine is an antidepressant (SNRI) approved for diabetic neuropathic pain, fibromyalgia, and chronic musculoskeletal pain. It raises serotonin and noradrenaline in the brain and spinal cord, which can dampen pain signals. A common regimen is 60 mg once daily after starting at 30 mg per day. Side effects include nausea, dry mouth, sweating, and sometimes increased blood pressure.DrugBank+4FDA Access Data+4FDA Access Data+4Tricyclic antidepressants (e.g., amitriptyline, nortriptyline)
These older antidepressants are often used in low doses at night for neuropathic pain. They block reuptake of serotonin and noradrenaline and also block certain pain-related receptors. Low doses (for example 10–25 mg at bedtime, adjusted by a doctor) may improve sleep and pain. Common side effects are dry mouth, constipation, dizziness, and next-day sleepiness; heart rhythm problems are a concern at higher doses.NCBI+1Topical lidocaine 5% patch (Lidoderm and generics)
Lidocaine patches are applied on painful skin areas when there is superficial nerve pain. They work by blocking sodium channels in local nerve endings so they cannot fire easily. Typical use is up to 12 hours on, 12 hours off, on intact skin only, with a limited number of patches at one time. Side effects are usually local: skin redness, burning, or irritation.FDA Access Data+2FDA Access Data+2Topical capsaicin 8% patch (Qutenza)
Qutenza is a high-dose capsaicin patch used in some adults for neuropathic pain; it is applied in a clinic. Capsaicin overstimulates and then “desensitizes” certain pain fibers, which can give several months of relief. Application is controlled, often up to 60 minutes, with protective measures to avoid eye or airway exposure. Side effects include strong burning at the time of treatment, redness, and temporary increased pain.FDA Access Data+2FDA Access Data+2Tramadol
Tramadol is a weak opioid that also affects serotonin and noradrenaline. It may be used for short periods when pain is not controlled by other medicines. Extended-release tablets might be given once daily at doses chosen by the doctor, with strict limits to reduce risk of addiction, breathing problems, and seizures. Common side effects are nausea, dizziness, constipation, and drowsiness; it should be used very cautiously, if at all, and never without medical supervision.FDA Access Data+2FDA Access Data+2Simple analgesics (paracetamol / acetaminophen)
Paracetamol does not directly treat nerve pain but can help with muscle and joint aches that accompany CMT. It works mainly in the brain to reduce pain and fever. When used, doctors keep the total daily dose within safe limits (often not more than 3000–4000 mg in adults) to protect the liver. It usually has few side effects when used correctly, but overdose can be dangerous.Mayo Clinic+1Non-steroidal anti-inflammatory drugs (NSAIDs – e.g., ibuprofen, naproxen)
NSAIDs reduce inflammation and are more useful for joint strain and tendon pain than for pure nerve pain. They block cyclo-oxygenase enzymes, lowering prostaglandin levels that cause pain and swelling. Doctors are careful with dose and duration because NSAIDs can irritate the stomach, affect the kidneys, and raise blood pressure in some people.UVA Health+1Muscle relaxants (e.g., baclofen, tizanidine)
Some people with CMT2P have painful muscle spasms or stiffness. Drugs like baclofen act on receptors in the spinal cord to reduce muscle tone. They can improve comfort and sleep but may cause weakness and sleepiness if the dose is too high. Doses are started low and increased slowly by the doctor.PMC+1Benzodiazepines (e.g., clonazepam) – used very cautiously
Clonazepam and similar drugs may be used for severe night-time cramps or anxiety linked to chronic illness. They enhance the effect of GABA, a calming neurotransmitter. Because they can cause dependence, falls, and daytime drowsiness, many doctors avoid them or keep doses very low for short periods only.NCBI+1Other SNRIs or SSRIs (e.g., venlafaxine)
Some antidepressants other than duloxetine are used off-label for neuropathic pain. They increase serotonin and noradrenaline, strengthening the body’s own pain-inhibiting pathways. Their main purpose is to treat depression and anxiety, but pain often improves when mood and sleep improve. Side effects vary but can include nausea, sweating, or blood-pressure changes.NCBI+1Sleep medicines and melatonin
Chronic pain and muscle cramps can disturb sleep. Short-term use of mild sleep aids or melatonin may help reset sleep patterns. Better sleep lowers pain sensitivity the next day. Doctors choose the lowest effective dose and avoid strong sedatives whenever possible to reduce dependence and morning grogginess.NCBI+1Anti-spasticity botulinum toxin injections
In some cases of focal muscle over-activity or deformity, small injections of botulinum toxin into specific muscles can reduce abnormal pulling. This blocks acetylcholine release at the nerve–muscle junction. It can improve positioning and pain for several months, but must be repeated and done only by experienced clinicians.PMC+1Topical NSAID gels
Gels with diclofenac or similar drugs can be applied over painful joints and tendons around weak feet and ankles. They work locally to reduce inflammation with minimal blood levels. This may reduce risk of stomach or kidney side effects compared with oral NSAIDs, though skin irritation can occur.UVA Health+1Vitamin D and calcium when deficient
If blood tests show low vitamin D, doctors may prescribe supplements. The purpose is to keep bones strong and lower fracture risk, especially in people who fall more often. Vitamin D works by improving calcium absorption and bone remodeling. Doses depend on blood levels and must be guided by a clinician.PMC+1Drugs for associated depression or anxiety
Living with long-term disability can cause mood disorders. Standard antidepressants or anti-anxiety medicines may be used when counseling alone is not enough. Treating mood improves participation in therapy, sleep, and overall pain tolerance. The exact drug and dose are chosen based on age, other illnesses, and possible interactions.NCBI+1Drugs for urinary or autonomic problems (when present)
Some people with CMT2P have bladder urgency or other autonomic symptoms. Doctors may use anticholinergic or other bladder medicines to reduce urgency and frequency. These work by relaxing smooth muscle in the bladder wall but can cause dry mouth or constipation, so they are used only when clearly needed.MalaCards+1Agents for osteoporosis prevention (if at high risk)
Reduced activity and frequent falls can increase fracture risk. In selected adults, doctors may use bisphosphonates or other bone-strengthening drugs after careful assessment. These medicines slow bone breakdown so bones stay denser, but they have important side effects and are not used in everyone.PMC+1Participation in clinical trials (experimental agents)
Several experimental drugs and gene-based therapies are under study for different types of CMT, including approaches that aim to protect or repair axons. They act through many mechanisms, such as improving mitochondrial function, correcting gene expression, or supporting myelin. These drugs should only be used inside approved clinical trials with close monitoring.PMC+2Springer Link+2
Dietary molecular supplements
No dietary supplement has been proven to cure CMT2P, and many have only limited evidence in other types of neuropathy. Still, some are studied for nerve health and antioxidant support. Never start many supplements at once, and always review them with a doctor or pharmacist.ScienceDirect+4PMC+4Diabetes Journals+4
Alpha-lipoic acid (ALA) – An antioxidant that helps recycle other antioxidants like glutathione. Trials in diabetic neuropathy used about 600 mg per day, improving burning and tingling symptoms in some patients. It may reduce oxidative stress in nerves, but evidence in CMT is lacking.Cureus+5PMC+5Diabetes Journals+5
Acetyl-L-carnitine (ALC) – ALC supports mitochondrial energy production and may protect nerve fibers. Studies in painful peripheral neuropathy show moderate pain relief with doses often around 1–3 g per day, split into several doses. It seems to support nerve regeneration and reduce pain in some patients.RMJ+4PMC+4PLOS+4
Omega-3 fatty acids (fish oil) – Omega-3 fats may help nerve membranes and have anti-inflammatory effects. Animal and human studies suggest they might support nerve regeneration and reduce neuropathy in some conditions, though results are mixed. Typical doses in studies vary from 1–3 g of EPA/DHA per day.MedCentral+6PMC+6Frontiers+6
Coenzyme Q10 (CoQ10) – CoQ10 is a key part of mitochondrial energy production and a powerful antioxidant. It has shown benefit in some mitochondrial diseases and may protect nerves by improving mitochondrial function and reducing oxidative stress. Doses in studies vary widely (often 100–300 mg/day).ClinicalTrials.gov+4PubMed+4SAGE Journals+4
B-complex vitamins (B1, B6, B12) at safe doses – B vitamins are important for nerve metabolism and myelin. Correcting real deficiencies (for example B12 deficiency) can improve neuropathy. However, very high doses of B6 can actually cause neuropathy, so balanced, doctor-guided dosing is essential.MedRxiv+2Cureus+2
Vitamin D (if low) – Vitamin D supports muscle and bone health and may influence nerve function. Supplementing to correct deficiency can improve muscle strength and reduce fracture risk, especially in less active people with CMT. Routine blood testing guides the dose.PMC+2Muscular Dystrophy Association+2
Magnesium (for cramps if deficient) – Magnesium helps muscles relax after contraction and supports nerve transmission. In people with low magnesium, replacement may reduce leg cramps and spasms. Too much magnesium can cause diarrhea or, rarely, heart rhythm changes, so dosing must be sensible.PMC+2PLOS+2
Curcumin (from turmeric) – experimental
Curcumin has anti-inflammatory and antioxidant actions in many laboratory models. It might protect nerves by reducing inflammatory signaling and oxidative stress. Human data in neuropathy are still limited and doses vary widely in studies; absorption is often improved with piperine or special formulations.ScienceDirect+1N-acetylcysteine (NAC) – experimental antioxidant
NAC helps the body make glutathione, a key cellular antioxidant. In theory, this could protect nerve cells from oxidative stress linked to chronic neuropathy. Evidence in CMT is not available, and it should be used only under medical supervision, especially if other medicines are taken.PMC+1Resveratrol – experimental
Resveratrol, found in grapes and some berries, activates cellular pathways linked to mitochondrial function and antioxidant defense. Animal studies suggest neuroprotective effects, but human data in neuropathy are scarce. It might be used as part of a research plan but should not replace standard care.PubMed+2ScienceDirect+2
Immunity-booster / regenerative / stem-cell-related drugs
For CMT2P there are no approved regenerative or stem-cell drugs. All approaches listed here are experimental or conceptual, and should only be used inside clinical trials at specialist centers.PMC+2Springer Link+2
Gene therapy targeting CMT subtypes (research stage)
Researchers are exploring viral vectors (like AAV) to deliver correct copies of disease genes or to silence harmful ones. For LRSAM1-related CMT, this idea is still pre-clinical. The purpose would be to restore normal protein function in nerve cells so axons stop degenerating. Safety and long-term effects are still being studied.PMC+2Springer Link+2Small-molecule “disease-modifying” drugs for CMT (trials in other types)
Some drugs are in trials for other CMT types (such as CMT1A) to correct myelin or axon biology. They aim to adjust signaling pathways, improve myelin protein balance, or protect axons from stress. These trials teach scientists how to design similar agents for CMT2P in the future, but they are not yet standard treatment.PMC+1Mesenchymal stem-cell therapy (experimental)
Stem cells from bone marrow or fat are being studied for their ability to release growth factors that help nerves repair. In theory, they may reduce inflammation and support remyelination. However, evidence is still limited, and unregulated stem-cell clinics can be risky and expensive. Only clinical-trial use is recommended.PMC+1Neurotrophic-factor based treatments
Drugs or biologics that increase nerve growth factors (like NGF, GDNF, or BDNF) may help support damaged axons. These agents try to enhance survival and regrowth of peripheral nerves. Many attempts have had side effects or limited success so far, so this remains a research area, not routine care.PMC+1Advanced mitochondrial-targeted antioxidants
New molecules designed to concentrate inside mitochondria may better protect nerve cells from oxidative damage than standard antioxidants. Early work includes CoQ10 analogues and other mitochondrial-targeted compounds. These are experimental and may eventually become part of combination therapy if proven safe and effective.PubMed+2ScienceDirect+2Immune-modulating therapies (only if a second immune problem is present)
CMT2P itself is not an autoimmune disease. However, if a person also has an autoimmune neuropathy, immunoglobulin infusions or other immune drugs might be used to treat that separate condition. These medicines work by calming misdirected immune attacks, but they do not fix the LRSAM1 mutation.PMC+1
Surgeries
Surgery does not cure CMT2P, but it can correct deformities and relieve pressure on nerves and joints. Decisions are made by an orthopedic surgeon who understands neuromuscular disorders.PMC+2UVA Health+2
Foot deformity correction (osteotomy)
High arches, claw toes, and tilted heels can cause pain, calluses, and instability. Surgeons may cut and realign bones in the foot to place weight more evenly. The goal is a flatter, more stable foot that fits better into braces and shoes, reducing pain and falls.Tendon transfer surgery
In tendon transfer, a stronger tendon is moved to help a weaker movement, such as lifting the front of the foot. The purpose is to improve active control of the ankle and reduce foot drop. After healing and therapy, many patients can walk more safely, sometimes with less bracing.Joint fusion (arthrodesis)
When joints are severely deformed and painful, fusing them in a better position can give a stable, pain-free base. In CMT, ankle or mid-foot fusions are sometimes used. The fused joint no longer moves, but the overall gait may improve because the foot is solid and better aligned.Nerve decompression (for entrapment)
Weak or deformed limbs can put extra pressure on nerves at places like the ankle or wrist. Decompression surgery opens tight tunnels (for example, carpal tunnel release) to free the nerve. This may improve tingling and numbness in some patients, though results can vary.Corrective surgery for hand deformities
In advanced disease, fingers and thumbs may drift into weak positions. Carefully planned tendon transfers or joint releases in the hand can improve grip and pinch strength. The goal is to support daily function like writing, using cutlery, or using a phone.
Prevention and lifestyle
CMT2P itself cannot be prevented because it is genetic, but many complications can be reduced:UVA Health+3PMC+3Muscular Dystrophy Association+3
Avoid known nerve-toxic medicines (some chemotherapy drugs, high-dose vitamin B6, and certain antibiotics) unless there is no alternative and a neurologist agrees.
Protect your feet with good shoes, daily skin checks, and prompt care of cuts or blisters to avoid ulcers and infections.
Keep moving safely with regular low-impact exercise like walking, cycling, or swimming to maintain strength and balance.
Use braces and aids early, not late, to prevent falls and joint deformities.
Maintain a healthy body weight to reduce stress on weak feet and joints and to make moving easier.
Do not smoke, because smoking harms blood flow to nerves and slows healing.
Limit alcohol, as heavy drinking can damage nerves further and worsen balance.
Manage other diseases well, especially diabetes, thyroid problems, and vitamin deficiencies, which can add extra nerve damage.
Keep vaccinations up to date (like flu and pneumonia shots) to lower the risk of severe infections that can cause long bed rest and muscle loss.
Attend regular check-ups with a neuromuscular specialist, physiatrist, and therapist so small problems are treated before they become big ones.
When to see a doctor
You should see a doctor, preferably a neurologist who knows about CMT, if you or a family member has:Mayo Clinic+3Genetic Rare Diseases Center+3MalaCards+3
New or worsening weakness in feet, legs, or hands
Frequent tripping, falls, or trouble climbing stairs
Loss of feeling, burning pain, or tingling in feet or hands
New foot deformities such as high arches, hammertoes, or very unstable ankles
Severe night-time cramps or pain that does not improve with simple measures
Family history of CMT or unexplained neuropathy and you want genetic counseling
Sudden changes like very rapid weakness, bowel or bladder loss, or severe back pain – these are emergencies and need urgent care
A doctor can confirm the diagnosis, order nerve tests and genetic tests, and build a personal treatment plan.
What to eat and what to avoid
Food cannot cure CMT2P, but a healthy diet supports muscles, nerves, and general health.Bioscientifica+4PMC+4PMC+4
Eat plenty of vegetables and fruits – They give vitamins, minerals, and antioxidants that support nerve and muscle cells.
Choose lean proteins such as fish, eggs, beans, and lean meat to provide building blocks for muscles and enzymes.
Include healthy fats from fish, nuts, seeds, and olive oil, which provide omega-3 and other fats helpful for cell membranes.
Use whole grains like brown rice, oats, and whole-wheat bread to keep energy steady and support a healthy weight.
Stay well hydrated with water and limit sugary drinks, which can cause weight gain and blood-sugar spikes.
Avoid very high sugar intake, as uncontrolled diabetes or pre-diabetes can add more nerve damage on top of CMT.
Limit highly processed foods high in salt, unhealthy fats, and additives, because they can worsen cardiovascular and metabolic health.
Keep alcohol low or avoid it, since heavy use can injure nerves and affect balance.
Avoid extreme “fad” diets that cut out entire food groups, as they can lead to vitamin and mineral deficiencies that harm nerves.
Discuss supplements (like ALA, ALC, omega-3, CoQ10) with your doctor so they are safe with your age, kidneys, liver, and other medicines.
Frequently asked questions (FAQs)
Is CMT2P caused by LRSAM1 the same as other types of CMT?
No. CMT is a large group of inherited neuropathies. CMT2P is a specific axonal type caused by changes in the LRSAM1 gene. Many symptoms overlap with other CMT types, but the gene, inheritance pattern, and sometimes age of onset can differ.Springer Link+3Genetic Rare Diseases Center+3MalaCards+3Can CMT2P be cured today?
At the moment, there is no cure. Treatment aims to control symptoms, protect joints, and maintain independence. Researchers are actively studying gene-based and disease-modifying treatments, but these are not yet routine.PMC+2Springer Link+2Will everyone with the LRSAM1 mutation have the same severity?
No. Even within the same family, some people may have mild symptoms while others are more affected. Age of onset, rate of progression, and the exact mutation all influence how severe the disease becomes.ScienceDirect+2Institut Myologie+2How is CMT2P diagnosed?
Doctors take a detailed history, examine strength and sensation, and often perform nerve conduction studies and electromyography. Genetic testing then confirms a pathogenic LRSAM1 variant. Sometimes other causes of neuropathy (like diabetes or vitamin deficiency) are checked at the same time.Springer Link+3Genetic Rare Diseases Center+3MalaCards+3Does every person with CMT2P need braces?
No. Some people have mild symptoms and walk well without braces. Others benefit from ankle-foot orthoses, shoe inserts, or hand splints to improve safety and reduce fatigue. The decision is based on the person’s function and goals.Charcot-Marie-Tooth Association+2Mayo Clinic+2Can exercise make my nerves worse?
Too much intense exercise can over-stress weak muscles, but properly guided, low-impact exercise is helpful and recommended. Working with a physical therapist helps you find the right level and type of activity.Muscular Dystrophy Association+2Charcot-Marie-Tooth Disease+2Which pain medicine is “best” for CMT2P?
There is no single best drug. Some people respond better to pregabalin or gabapentin, others to duloxetine or tricyclic antidepressants. Often doctors try one medicine, adjust the dose, and then consider another or a combination if needed. Side-effects, age, kidney and liver function all affect the choice.DrugBank+4NCBI+4FDA Access Data+4Are opioids recommended for CMT pain?
In general, opioids like tramadol are not first-line for neuropathic pain because of risks of dependence, overdose, and side effects. They may be used short-term in selected cases under close specialist supervision, after other options have been tried.PMC+3FDA Access Data+3FDA Access Data+3Will supplements alone control my symptoms?
Supplements such as ALA, ALC, omega-3, or CoQ10 may offer small extra benefits in some kinds of neuropathy but should never replace braces, therapy, or prescribed medicines. Evidence in CMT2P is limited, so they are usually considered optional add-ons, not main treatment.Bioscientifica+4PMC+4PMC+4Can CMT2P affect life span?
Most people with CMT, including CMT2P, have a near-normal life expectancy, especially with good care and fall prevention. The main impact is on mobility and daily activities, not on life span, unless serious complications occur.PMC+2Genetic Rare Diseases Center+2Can children be tested for LRSAM1 mutations?
Yes, but genetic testing in children is a sensitive decision. Genetic counselors and doctors discuss the pros and cons, including psychological impact, timing, and whether results will change medical care.MalaCards+2Monarch Initiative+2Is pregnancy safe for someone with CMT2P?
Many people with CMT have healthy pregnancies. However, extra planning is needed because weakness or balance problems may worsen during pregnancy. An obstetrician, neurologist, and anesthesiologist should be involved early to plan safe delivery and anesthesia.PMC+1Can I choose a career or sport if I have CMT2P?
Yes, but it is wise to avoid jobs or sports with heavy lifting, frequent climbing, or high fall risk. Many people with CMT work in desk-based, creative, or technical jobs and exercise with safe sports like swimming or cycling. A physiatrist or therapist can help match activities to your abilities.Charcot-Marie-Tooth Disease+2PMC+2How often should I see my neurologist?
This depends on severity, but many people are reviewed once or twice a year, or sooner if new problems appear. Regular visits allow adjustment of braces, therapies, and medicines, and provide a chance to hear about new research or clinical trials.PMC+2Muscular Dystrophy Association+2Where can I find more reliable information and support?
Trusted sources include national CMT organizations, muscular dystrophy associations, and academic neuromuscular clinics. These groups provide educational material, links to clinical trials, and patient support communities. Always check that the information is from reputable medical or patient organizations, not from unproven “cure” sellers.Charcot-Marie-Tooth Association+3PMC+3Charcot-Marie-Tooth Disease+3
Disclaimer: Each person’s journey is unique, treatment plan, life style, food habit, hormonal condition, immune system, chronic disease condition, geological location, weather and previous medical history is also unique. So always seek the best advice from a qualified medical professional or health care provider before trying any treatments to ensure to find out the best plan for you. This guide is for general information and educational purposes only. Regular check-ups and awareness can help to manage and prevent complications associated with these diseases conditions. If you or someone are suffering from this disease condition bookmark this website or share with someone who might find it useful! Boost your knowledge and stay ahead in your health journey. We always try to ensure that the content is regularly updated to reflect the latest medical research and treatment options. Thank you for giving your valuable time to read the article.
The article is written by Team RxHarun and reviewed by the Rx Editorial Board Members
Last Updated: December 22, 2025.
