Alagille syndrome (ALGS) is a rare JAG1 (encodes for a Notch ligand) autosomal dominant disease affecting approximately 1 in 30,000-40,000 individuals. ALGS developmental defects cause an absence of bile ducts (intrahepatic duct paucity, IHDP) with an inability to transport bile from the liver to bile ducts (cholestasis) as well as heart problems.