Bile Acid Synthesis Defect, Congenital, 1, also known as congenital bile acid synthesis defect 1, is related to cholestasis, progressive familial intrahepatic, 4 and congenital bile acid synthesis defect, and has symptoms including diarrhea and icterus. An important gene associated with Bile Acid Synthesis Defect, Congenital, 1 is HSD3B7 (Hydroxy-Delta-5-Steroid Dehydrogenase, 3 Beta- And Steroid Delta-Isomerase 7). Affiliated tissues include liver and spleen, and related phenotypes are failure to thrive and hepatomegaly