Understanding Alagille Syndrome: Symptoms, Diagnosis, and Treatment

Alagille syndrome (uh-LA-geel) is a rare condition that some babies are born with. It mainly affects the liver and heart, but it can also impact other parts of the body, such as bones, eyes, and kidneys.

The condition occurs when a child is born with fewer bile ducts. Bile ducts help remove waste from the liver.

Without enough bile ducts, bile builds up in the liver and bloodstream, which can cause liver damage and other symptoms.

What Causes Alagille Syndrome?

Alagille syndrome is caused by a change (mutation) in a gene called JAG1 or NOTCH2. These genes help control how organs form and grow. If the gene doesn’t work properly, it can lead to problems in the liver, heart, and other parts of the body.

The gene change can run in families. If one parent has the gene mutation, there’s a 50 percent chance of passing it to their child. Doctors use genetic testing to help confirm a diagnosis.

Common Symptoms

Symptoms of Alagille syndrome usually appear in the first few months of life. Every child is different, but common signs include:

• Yellow skin or eyes (jaundice)
• Itchy skin
• Slow growth
• Heart problems, such as narrow blood vessels or holes in the heart
• Butterfly-shaped bones in the spine, seen on X-rays
• Distinct facial features, such as a broad forehead, deep-set eyes, and pointed chin
• Differences in the eyes that don’t affect vision
• Kidney problems found on tests
• Trouble gaining weight or absorbing certain vitamins

Some children may also develop vitamin deficiencies, which can lead to problems like easy bruising, weakness, or poor bone health.

How Is It Diagnosed?

Doctors diagnose Alagille syndrome by looking at a child’s symptoms and running tests. These may include:

• Blood tests to check liver function
• Imaging tests, such as an ultrasound or X-ray
• Genetic testing to confirm the diagnosis

In some families, prenatal testing may help identify the condition early.

How Is It Treated?

There’s no cure for Alagille syndrome, but treatment focuses on helping the child grow and stay as healthy as possible. A team of specialists and nutrition experts, work together to care for each child.

Treatment may include:

• Medicines to improve bile flow and reduce itching
• Special diets and vitamin supplements
• High-calorie foods to help with growth
• Fats that are easier to digest, such as medium-chain triglycerides (MCTs)
• Surgery to help bile drainage, if needed
• Liver transplant if the liver becomes too damaged to function properly

Possible Complications

Alagille syndrome can cause serious liver disease, which may lead to liver failure. In these cases, a liver transplant is sometimes needed. Heart defects are also common and may require monitoring or surgery.

Some children may have trouble absorbing nutrients, leading to growth delays. There’s also an increased risk of blood vessel problems, so regular checkups and testing are important.

When to See a Doctor

If your baby has jaundice that lasts longer than a few weeks, isn’t gaining weight, or shows signs of liver or heart problems, talk to your doctor. Early diagnosis and care can make a big difference in your child’s health.

At Jackson Health System, our pediatric liver transplant team works with children who have Alagille syndrome. We’re here for you every step of the way.