Bile Acid Synthesis Defect, Congenital, 4, also known as congenital bile acid synthesis defect 4, is related to alpha-methylacyl-coa racemase deficiency and disorder of bile acid synthesis, and has symptoms including icterus, muscle spasticity and seizures. An important gene associated with Bile Acid Synthesis Defect, Congenital, 4 is AMACR (Alpha-Methylacyl-CoA Racemase). Affiliated tissues include liver and bone marrow, and related phenotypes are abnormal circulating enzyme concentration or activity and seizure