It is caused by abnormalities in the gene coding for uridine diphosphoglucuronate glucuronosyltransferase (UGT1A1). UGT1A1 normally catalyzes the conjugation of bilirubin and glucuronic acid within hepatocytes. Conjugated bilirubin is more water-soluble and is excreted in bile.
Crigler–Najjar syndrome
Gilbert's syndrome  Gilbert's syndrome  1
GRACILE syndrome
Baggio–Yoshinari syndrome
CLOVES syndrome
Hajdu–Cheney syndrome
DeSanto-Shinawi syndrome
Van Gogh syndrome