Alagille syndrome, or ALGS, is a genetic disorder that can affect multiple organs in the body and cause a variety of abnormalities.
Alagille syndrome typically affects the liver but it can also cause problems in the heart, kidney, eyes, and bones.
One of the main liver features of Alagille syndrome is the disruption of bile flow from the liver to the gallbladder.
Affected individuals have a reduced number of bile ducts in the liver.
As a result, there is a decrease in bile flow, also known as cholestasis.
The symptoms and signs of cholestasis include jaundice, or the yellowing of skin and eyes, severe itching, pale colored stools, and dark urine.
Some patients may also have an enlarged spleen or liver.
Because many necessary vitamins and nutrients need bile to be properly absorbed, people with Alagille syndrome may also experience select vitamin deficiencies, or poor weight gain and growth.
Deficiencies in specific vitamins may result in vision problems from a lack of Vitamin A, bone weakness from a lack of vitamin D, developmental delays from a lack of Vitamin E, and blood clotting problems from a lack of Vitamin K.
The heart can also be impacted by Alagille syndrome.
The most common finding in ALGS patients is peripheral pulmonary arterial stenosis.
This means that the blood vessels carrying blood to the lungs are narrowed.
The stenosis typically manifests as a heart murmur, or an extra sound in the heartbeat.
Symptoms are based on the degree of narrowing of the blood vessel and some people may have no symptoms while others may have dizziness, shortness of breath, increased sweating, chest pains, and cyanosis, or bluish colored skin.