Overview
X-linked distal hereditary motor neuropathy (also called X-linked distal spinal muscular atrophy or dHMN-X) is a rare inherited nerve disorder that primarily affects the motor nerves — the nerves that control muscle movement. Because it follows an X-linked inheritance pattern, it mainly affects males, though females who carry the gene change may sometimes have milder symptoms. The disease targets the distal muscles, meaning the muscles farthest from the center of the body, such as those in the hands and feet. Over time, people with this condition experience progressive weakness and wasting (atrophy) of these muscles, which can make it harder to grip objects, write, walk, or maintain balance. Symptoms typically begin in childhood or adolescence, though the age of onset can vary. The weakness usually starts in the feet and lower legs, leading to difficulty walking, foot drop (trouble lifting the front of the foot), and changes in foot shape such as high arches. As the disease progresses, the hands and forearms may also become affected. Unlike some other neuropathies, sensation (the ability to feel touch, temperature, and pain) is usually preserved or only mildly affected, because the sensory nerves are largely spared. There is currently no cure for X-linked distal hereditary motor neuropathy. Treatment focuses on managing symptoms and maintaining function for as long as possible. This includes physical therapy, occupational therapy, orthotic devices like ankle-foot braces, and sometimes surgery to correct foot deformities. Research is ongoing to better understand the genetic mechanisms and to develop targeted therapies.
Also known as:
Key symptoms:
Weakness in the feet and lower legsMuscle wasting in the hands and feetFoot drop (difficulty lifting the front of the foot)High arched feet (pes cavus)Hammer toes or other foot deformitiesDifficulty walking or unsteady gaitTrouble with fine hand movements like writing or buttoningMuscle cramps or twitchingReduced reflexes in the legsProgressive loss of hand grip strengthClaw hand deformity in advanced cases
X-linked recessive
Carried on the X chromosome; typically affects males more than females
Variable
Can begin at different ages, from infancy through adulthood
Treatments
No FDA-approved treatments are currently listed for X-linked distal hereditary motor neuropathy.
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Rare Disease Specialist
Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
No travel grants are currently matched to X-linked distal hereditary motor neuropathy.
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Questions for your doctor
Bring these to your next appointment
- Q1.What specific gene change is causing this condition in my family?,How quickly is the disease likely to progress in my case?,What physical therapy and rehabilitation options are best for maintaining function?,Are there any clinical trials or experimental treatments I should know about?,Should other family members be tested for this gene change?,What assistive devices or braces would help me the most right now?,How often should I have follow-up appointments and what tests will be needed?
Common questions about X-linked distal hereditary motor neuropathy
What is X-linked distal hereditary motor neuropathy?
X-linked distal hereditary motor neuropathy (also called X-linked distal spinal muscular atrophy or dHMN-X) is a rare inherited nerve disorder that primarily affects the motor nerves — the nerves that control muscle movement. Because it follows an X-linked inheritance pattern, it mainly affects males, though females who carry the gene change may sometimes have milder symptoms. The disease targets the distal muscles, meaning the muscles farthest from the center of the body, such as those in the hands and feet. Over time, people with this condition experience progressive weakness and wasting (at
How is X-linked distal hereditary motor neuropathy inherited?
X-linked distal hereditary motor neuropathy follows a x-linked recessive inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
Which specialists treat X-linked distal hereditary motor neuropathy?
1 specialists and care centers treating X-linked distal hereditary motor neuropathy are listed on UniteRare, sourced from ClinicalTrials.gov principal investigators, published research, and the NPPES NPI registry.