The bile acid synthetic gene 3β-hydroxy-Δ5-C27-steroid oxidoreductase is mutated in progressive intrahepatic cholestasis

Margrit Schwarz, Angelique C. Wright, Daphne L. Davis, Hisham Nazer, Ingemar Björkhem, David W. Russell

Research output: Contribution to journalArticle

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Abstract

We used expression cloning to isolate cDNAs encoding a microsomal 3β-hydroxy-Δ5-C27-steroid oxidoreductase (C27 3β-HSD) that is expressed predominantly in the liver. The predicted product shares 34% sequence identity with the C19 and C21 3β-HSD enzymes, which participate in steroid hormone metabolism. When transfected into cultured cells, the cloned C27 3β-HSD cDNA encodes an enzyme that is active against four 7α-hydroxylated sterols, indicating that a single C27 3β-HSD enzyme can participate in all known pathways of bile acid synthesis. The expressed enzyme did not metabolize several different C(19/21) steroids as substrates. The levels of hepatic C27 3β-HSD mRNA in the mouse are not sexually dimorphic and do not change in response to dietary cholesterol or to changes in bile acid pool size. The corresponding human gene on chromosome 16p11.2-12 contains six exons and spans 3 kb of DNA, and we identified a 2-bp deletion in the C27 3β-HSD gene of a patient with neonatal progressive intrahepatic cholestasis. This mutation eliminates the activity of the enzyme in transfected cells. These findings establish the central role of C27 3β-HSD in the biosynthesis of bile acids and provide molecular tools for the diagnosis of a third type of neonatal progressive intrahepatic cholestasis associated with impaired bile acid synthesis.

Original languageEnglish (US)
Pages (from-to)1175-1184
Number of pages10
JournalJournal of Clinical Investigation
Volume106
Issue number9
StatePublished - 2000

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Synthetic Genes
Intrahepatic Cholestasis
Bile Acids and Salts
Oxidoreductases
Steroids
Enzymes
Complementary DNA
Dietary Cholesterol
Chromosomes, Human, Pair 12
Liver
Sterols
Genes
Organism Cloning
Exons
Cultured Cells
Hormones
Messenger RNA
Mutation
DNA

ASJC Scopus subject areas

  • Medicine(all)

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The bile acid synthetic gene 3β-hydroxy-Δ5-C27-steroid oxidoreductase is mutated in progressive intrahepatic cholestasis. / Schwarz, Margrit; Wright, Angelique C.; Davis, Daphne L.; Nazer, Hisham; Björkhem, Ingemar; Russell, David W.

In: Journal of Clinical Investigation, Vol. 106, No. 9, 2000, p. 1175-1184.

Research output: Contribution to journalArticle

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