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lüll Genetics of familial intrahepatic cholestasis syndromes van Mil SW; Houwen RH; Klomp LWJ Med Genet 2005[Jun]; 42 (6): 449-63Bile acids and bile salts have essential functions in the liver and in the small intestine. Their synthesis in the liver provides a metabolic pathway for the catabolism of cholesterol and their detergent properties promote the solubilisation of essential nutrients and vitamins in the small intestine. Inherited conditions that prevent the synthesis of bile acids or their excretion cause cholestasis, or impaired bile flow. These disorders generally lead to severe human liver disease, underscoring the essential role of bile acids in metabolism. Recent advances in the elucidation of gene defects underlying familial cholestasis syndromes has greatly increased knowledge about the process of bile flow. The expression of key proteins involved in bile flow is tightly regulated by transcription factors of the nuclear hormone receptor family, which function as sensors of bile acids and cholesterol. Here we review the genetics of familial cholestasis disorders, the functions of the affected genes in bile flow, and their regulation by bile acids and cholesterol.|ATP-Binding Cassette Transporters/genetics[MESH]|Bile Acids and Salts/biosynthesis/chemistry/metabolism[MESH]|Bile/metabolism[MESH]|Cholestasis, Intrahepatic/*genetics[MESH]|Humans[MESH]|Membrane Proteins/genetics[MESH]|Mutation[MESH]|Syndrome[MESH]|Zonula Occludens-2 Protein[MESH] |