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An infantile hereditary disorder of bile formation that is hepatocellular in origin and associated with extrahepatic features. Onset occurs mostly during infancy with clinical signs of cholestasis with recurrent or permanent jaundice associated with hepatomegaly and severe pruritus. Caused by mutations in the ATP8B1 gene (18q21-22) encoding the FIC1 protein expressed at the canalicular membrane of hepatocytes as well as in other epithelia. Transmission is autosomal recessive.
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