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Living with Maternally-inherited Leigh syndrome

A progressive brain condition starting in infancy or childhood, passed from mother to child through mitochondrial DNA.

Understanding Maternally-inherited Leigh syndrome

Maternally-inherited Leigh syndrome, also called mitochondrial DNA-associated Leigh syndrome, is a progressive brain disorder that usually appears in infancy or early childhood.

Children may have vomiting, seizures, delayed development, muscle weakness, and movement problems. Heart disease, kidney problems, and breathing difficulty can also occur. Changes in at least 11 mitochondrial genes have been found to cause it.

Signs & symptoms

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

  • Seizures
  • Delayed development
  • Muscle weakness and low muscle tone
  • Unsteady movement (ataxia)
  • Repeated vomiting
  • Weak eye movement muscles

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. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    Cure Mito Foundation, United Mitochondrial Disease Foundation and MitoAction 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: Cure Mito Foundation, United Mitochondrial Disease Foundation, MitoAction
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 Cure Mito Foundation 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
Should we have mitochondrial DNA testing for our family?
Which specialists should follow the brain, heart, and kidneys?
How can we support movement, feeding, and development?

Quick facts

Symptoms usually startInfant and as a Child
InheritanceMitochondrial

It is caused by changes in mitochondrial DNA. It follows maternal (mitochondrial) inheritance. Mitochondria pass only through egg cells, so only females pass it to their children.

GeneticNeurologicalInherited MetabolicMitochondrial

Also known as: maternally inherited infantile subacute necrotizing encephalopathy; maternally inherited leigh disease; maternally inherited leigh syndrome; maternally-inherited infantile subacute necrotizing encephalopathy; maternally-inherited leigh disease; mils

Patient organizations

Source: NIH GARD · Maternally-inherited Leigh syndromeGARD ID 3671 · 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 Maternally-inherited Leigh syndrome.

Explore the Maternally-inherited Leigh syndrome blog

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Explore actively recruiting Maternally-inherited Leigh syndrome studies with HealthSpark.

HealthSpark

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  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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