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A severe anomaly of bile acid synthesis with manifestation of severe neonatal cholestatic liver disease. To date, only 2 cases of this disorder have been reported. Caused by mutations in the 7-alpha hydroxylase gene (CYP7B1, 8q21.3). The deficiency in oxysterol 7-alpha-hydroxylation leads to the accumulation of hepatotoxic unsaturated monohydroxy bile acids. The mode of transmission is presumed to be autosomal recessive.
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