What is Alagille syndrome?
Alagille syndrome is a rare genetic condition that affects the liver and several other parts of the body. Children born with this condition have fewer bile ducts inside the liver, which makes it harder for bile to drain properly. When bile builds up, it can damage the liver over time.
Although the liver is most commonly affected, Alagille syndrome may also involve the heart, kidneys, eyes, bones, blood vessels, and growth and development. Symptoms and severity can vary from person to person.
Alagille syndrome is usually caused by a change in the JAG1 gene and less commonly the NOTCH2 gene. It can run in families, but some children develop the condition even without a family history.
Symptoms
Symptoms of Alagille syndrome often appear during infancy or early childhood. Some children have mild symptoms, while others may develop more serious health concerns.
Common symptoms can include:
- Yellowing of the skin or eyes (jaundice)
- Severe itching
- Pale, gray, or white stools
- Dark urine
- Poor growth or difficulty gaining weight
- Trouble absorbing vitamins and nutrients
- Fatty deposits under the skin
- Heart murmurs or heart defects
- Enlarged spleen
- Kidney problems
- Distinct facial features
- Bone or spine changes
How is it diagnosed?
Doctors diagnose Alagille syndrome by reviewing symptoms, medical history, and test results. Because the condition can affect several organs, children may need evaluations from multiple specialists.
Testing may include:
- Blood tests to check liver function
- Genetic testing
- Liver biopsy
- Heart imaging or other cardiac tests
- Eye exams
- Spine X-rays
- Ultrasound imaging
- Kidney function testing
Early diagnosis can help guide treatment and monitor for complications.
How is it treated?
Treatment for Alagille syndrome focuses on relieving symptoms, supporting nutrition, and protecting liver function. Care plans are personalized based on how the condition affects each child.
Treatment options may include:
- Medicines to improve bile flow
- Treatments to reduce itching
- Vitamin supplements, especially vitamins A, D, E, and K
- Nutritional support and high-calorie diets
- Monitoring and treatment for heart or kidney problems
- Surgery in some cases to improve bile drainage
- Liver transplantation for advanced liver disease
Many children benefit from long-term care with a team of specialists. Regular follow-up visits are important to monitor growth, nutrition, and organ function.
