Maternally Inherited Leigh Syndrome: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Maternally Inherited Leigh Syndrome?
A pediatrician or family doctor is often the first to notice warning signs and will refer the family to a specialist. The main specialist is usually a neurologist trained in metabolic or mitochondrial disease, and geneticists help with testing and family planning. The primary care doctor continues to coordinate everyday care.
What it is
Maternally inherited Leigh syndrome is a rare, life-threatening condition that affects the brain and other parts of the nervous system. It is caused by problems in the mitochondria, the tiny parts of our cells that turn food into energy. Because the body cannot make enough energy, nerve cells in the brain become damaged over time. The word maternally inherited means the condition is passed down from the mother through mitochondrial DNA, which comes only from the mother's egg.
Symptoms
Symptoms usually begin in infancy, often between a few months and two years of age. Common early signs include poor feeding, vomiting, slow growth, and low muscle tone. Children may lose skills they had already learned, and other symptoms can include seizures, trouble breathing or swallowing, and weakness. Illness or fever can make symptoms suddenly worse.
Causes and who gets it
This condition is caused by mutations in the mitochondrial DNA, which is passed from mother to child through the egg. Fathers do not pass it on. Not every child of a mother with the changed DNA will develop the disease, because the amount of changed DNA in each child's cells can vary.
How doctors diagnose it
Doctors start with a physical exam and a detailed history of symptoms and family background. Brain imaging, especially an MRI scan, often shows a pattern of damage in specific areas. Blood, urine, and genetic testing can find chemicals that build up and confirm the changed mitochondrial DNA.
Treatment
There is no cure, and results differ from person to person. Treatment focuses on easing symptoms and supporting the child. Care may include vitamins such as thiamine, medicines to control seizures, feeding support, physical therapy, and breathing support when needed.
When to see a doctor
Parents should contact a doctor if a baby or child has poor feeding, unexplained vomiting, floppiness, or is losing skills they once had. Sudden trouble breathing, swallowing, or new seizures need medical attention right away. Any child with a family history of Leigh syndrome should be evaluated early.
How a direct primary care or concierge doctor fits in
A direct primary care doctor is paid a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. These doctors can spend extra time with families facing a complex diagnosis and coordinate testing. They will refer the child to a neurologist or geneticist for the specialized parts of treatment.
Common questions
Can a father pass maternally inherited Leigh syndrome to his children?
No. Mitochondrial DNA comes only from the mother's egg, so fathers do not pass it on. A mother with the changed DNA can pass it to any of her children, though not all will develop symptoms.
Is there a cure?
There is no cure at this time. Treatment aims to ease symptoms, prevent worsening during illness, and support the child's development. Outcomes vary a great deal from one child to another.
Can it appear in an adult?
Most cases begin in infancy or early childhood, but some forms start later, even in adulthood. Adult cases are rare and can be harder to recognize. Genetic testing helps confirm the diagnosis at any age.
Sources
- MedlinePlus Genetics - Leigh syndrome
- NIH Genetic and Rare Diseases Information Center - Leigh syndrome
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
