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Living with X-linked distal spinal muscular atrophy type 3

A rare inherited nerve and muscle condition causing slowly worsening weakness in the hands and feet.

Understanding X-linked distal spinal muscular atrophy type 3

X-linked distal spinal muscular atrophy type 3 is a rare inherited motor nerve condition affecting the muscles of the hands and feet.

The muscles in the hands and feet slowly shrink and weaken. Sensation is mostly spared. Some people have mild weakness in the upper legs and hand deformities, mainly in males. It can begin at a variety of ages.

Signs & symptoms

GARD lists these symptoms as less common:

  • Muscle wasting in the hands and feet
  • Weakness in the hands and feet
  • Reduced reflexes
  • Decreased feeling in the hands and feet

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include brain and nervous system specialists and genetic specialists.

  3. Consider genetic testing

    Changes in ATP7A are linked to this condition. Genetic testing and counseling can help confirm a diagnosis and explain what it means for your family.

  4. Connect with expert centers

    The Foundation for Peripheral Neuropathy may keep lists of experts for this condition.

Care & treatment

Care team
Brain and nervous system specialists (neurologists); Genetic specialists (geneticists)
Expert care
Expert lists: The Foundation for Peripheral Neuropathy
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with The Foundation for Peripheral Neuropathy and other patient organizations
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
Could ATP7A genetic testing confirm the diagnosis?
What therapies can help with hand and foot weakness?
Which specialists should follow my care?

Quick facts

Symptoms usually starta variety of ages
InheritanceX-Linked
GenesATP7A

X-linked distal spinal muscular atrophy type 3 is caused by changes in the ATP7A gene and follows X-linked inheritance.

GeneticNeurologicalInherited Metabolic

Also known as: atp7a (atpase copper transporting alpha) related distal motor neuropathy; atp7a spinal muscular atrophy; atp7a-related distal motor neuropathy; dsmax; neuronopathy, distal hereditary motor, x-linked; neuropathy, distal hereditary motor, x-linked

Patient organizations

Source: NIH GARD · X-linked distal spinal muscular atrophy type 3GARD ID 16957 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with X-linked distal spinal muscular atrophy type 3.

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