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Living with Spinocerebellar ataxia 43

A rare inherited condition starting in adulthood with slowly worsening balance and walking problems and nerve damage.

Understanding Spinocerebellar ataxia 43

Spinocerebellar ataxia 43 is a rare inherited ataxia with balance and walking problems that begin late in adulthood.

Poor coordination worsens slowly. It comes with nerve damage in the limbs, causing reduced reflexes and less feeling. Leg pain and muscle wasting may occur, along with slurred speech, jerky eye movements and tremor.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Poor balance and unsteady walk
  • Nerve damage in the limbs
  • Reduced reflexes
  • Less feeling in the hands and feet
  • Slurred speech
  • Foot drop and high-arched 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 MME 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

    National Ataxia Foundation 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: National Ataxia Foundation
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 National Ataxia Foundation
  • 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
Can genetic testing of the MME gene confirm this diagnosis?
Which therapies can help with balance and walking?
Should the nerve damage be tested?

Quick facts

Symptoms usually startAdult and as an Older Adult
InheritanceAutosomal Dominant
GenesMME

GARD lists changes in the MME gene. It is inherited in an autosomal dominant pattern, meaning one changed copy of the gene is enough.

GeneticNeurological

Also known as: autosomal dominant cerebellar ataxia caused by mutation in mme; mme autosomal dominant cerebellar ataxia; sca43; spinocerebellar ataxia 43; sca43; spinocerebellar ataxia type 43

Patient organizations

Broader rare-disease groups

Source: NIH GARD · Spinocerebellar ataxia 43GARD ID 17917 · 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

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