P450 oxidoreductase deficiency: a new disorder of steroidogenesis

Miller, Walter L.; Huang, Ningwu; Pandey, Amit Vikram; Flück, Christa E.; Agrawal, Vishal (2005). P450 oxidoreductase deficiency: a new disorder of steroidogenesis. Annals of the New York Academy of Sciences, 1061, pp. 100-108. Blackwell 10.1196/annals.1336.012

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Microsomal P450 enzymes, which metabolize drugs and catalyze steroid biosynthesis require electron donation from NADPH via P450 oxidoreductase (POR). POR knockout mice are embryonically lethal, but we found recessive human POR missense mutations causing disordered steroidogenesis and Antley-Bixler syndrome (ABS), a skeletal malformation syndrome featuring craniosynostosis. Dominant mutations in exons 8 and 10 of fibroblast growth factor receptor 2 (FGFR2) cause phenotypically related craniosynostosis syndromes and were reported in patients with ABS and normal steroidogenesis. Sequencing POR and FGFR2 exons in 32 patients with ABS and/or hormonal findings suggesting POR deficiency showed complete genetic segregation of POR and FGFR2 mutations. Fifteen patients carried POR mutations on both alleles, four carried POR mutations on 1 allele, nine carried FGFR2/3 mutations on one allele and no mutation was found in three patients. The 34 affected POR alleles included 10 with A287P, 7 with R457H, 9 other missense mutations and 7 frameshifts. These 11 missense mutations and 10 others identified by database mining were expressed in E. coli, purified to apparent homogeneity, and their catalytic capacities were measured in four assays: reduction of cytochrome c, oxidation of NADPH, and support of the 17alpha-hydroxylase and 17,20 lyase activities of human P450c17. As assessed by Vmax/Km, 17,20 lyase activity provided the best correlation with clinical findings. Modeling human POR on the X-ray crystal structure of rat POR shows that these mutant activities correlate well with their locations in the structure. POR deficiency is a new disease, distinct from the craniosynostosis syndromes caused by FGFR mutations.

Item Type:

Journal Article (Review Article)

Division/Institute:

04 Faculty of Medicine > Department of Gynaecology, Paediatrics and Endocrinology (DFKE) > Clinic of Paediatric Medicine
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > Unit Childrens Hospital > Forschungsgruppe Endokrinologie / Diabetologie / Metabolik (Pädiatrie)
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > DCR Unit Tiefenau Hospital (discontinued)

UniBE Contributor:

Pandey, Amit Vikram and Flück, Christa

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0077-8923

Publisher:

Blackwell

Language:

English

Submitter:

Amit Vikram Pandey

Date Deposited:

05 Jun 2014 10:56

Last Modified:

05 Jun 2014 10:56

Publisher DOI:

10.1196/annals.1336.012

PubMed ID:

16467261

URI:

https://boris.unibe.ch/id/eprint/41742

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