Sengers Syndrome: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Sengers Syndrome?
A pediatrician or family doctor usually coordinates care. Because several organs are affected, a team is often involved: a cardiologist for the heart, an eye doctor for cataracts, a medical geneticist for testing and family planning, and a neurologist for muscle and developmental issues.
What it is
Sengers syndrome is a rare condition a person is born with. It affects the mitochondria, the parts of cells that turn food into energy. Because cells cannot make energy well, several organs are affected at once, especially the heart, muscles, eyes, and brain.
Symptoms
Signs usually appear at birth or soon after. A common sign is cataracts, a clouding of the lens of the eye. Many babies also have hypertrophic cardiomyopathy, in which the heart muscle thickens and pumps less well. Other signs include weak muscles, trouble feeding, slow growth, and lactic acid buildup in the blood. Severity differs from child to child.
Causes and who gets it
Sengers syndrome is caused by changes in a gene called AGK. It is inherited in an autosomal recessive pattern, meaning a child must get one changed copy from each parent. Parents with only one changed copy usually have no symptoms. Only a small number of cases have been reported.
How doctors diagnose it
Doctors start with the pattern of symptoms, such as cataracts with heart muscle problems. They may order an echocardiogram, an ultrasound of the heart, and blood tests for lactic acid. A muscle biopsy shows how well the mitochondria work, and genetic testing confirms the diagnosis.
Treatment
There is no cure. Treatment eases symptoms and watches for problems. A heart doctor may prescribe medicines to help the heart pump, and some children need cataract surgery. Physical therapy can help with strength and movement, and regular checkups track growth, vision, heart function, and development.
When to see a doctor
Talk to a doctor if a baby has cloudy eyes, trouble feeding, weak muscles, or slow growth. If a child is already diagnosed, new breathing trouble, extreme tiredness, or poor weight gain should be checked quickly. Sudden changes in breathing or lip or skin color need emergency care.
Common questions
How serious is Sengers syndrome?
It can be serious, especially when the heart muscle is badly affected. Some children have severe problems early in life, while others have milder symptoms. A heart doctor can explain what the tests show for a specific child.
Can Sengers syndrome be prevented?
There is no known way to prevent it, since it is inherited from parents' genes. Couples with a family history can meet with a genetic counselor, who explains the chance of passing on a changed gene. Testing before or during pregnancy is possible for some families.
How do doctors tell Sengers syndrome from other mitochondrial conditions?
Many mitochondrial conditions affect energy in cells, but Sengers syndrome has a specific pattern. The combination of cataracts, thickened heart muscle, and muscle weakness points doctors toward it. Genetic testing is what confirms the exact condition.
What are the chances of passing Sengers syndrome to my children?
When both parents carry one changed copy of the gene, each pregnancy has a one in four chance of being affected. A genetic counselor can arrange testing to find out who carries the gene. This gives families clear numbers instead of guesses.
Sources
- NIH Genetic and Rare Diseases Information Center - Sengers syndrome
- MedlinePlus - Mitochondrial Diseases
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.
