Cited by 72Sexual Differentiation and DisordersAdrenal Hormones and DisordersHormonal Regulation and Hypertension

Deletion of amino acids Asp487-Ser488-Phe489 in human cytochrome P450c17 causes severe 17 alpha-hydroxylase deficiency.

Fardella, C E, Zhang, L H, Mahachoklertwattana, P, Lin, D, Miller, W L·1993·The Journal of Clinical Endocrinology & Metabolism

Abstract

17 alpha-Hydroxylase deficiency blocks the biosynthesis of cortisol and sex steroids, resulting in mineralocorticoid excess, hypertension, sexual infantilism, and female phenotype in both genetic sexes. The disease is caused by mutations in the gene encoding cytochrome P450c17, which is the single enzyme that mediates both 17 alpha-hydroxylase and 17,20-lyase activities. We report a 14-yr-old patient from Thailand with a classical clinical presentation of this rare disorder. Analysis of her P450c17 gene by polymerase chain reaction amplification and sequencing showed a nine-base deletion, eliminating codons 487-489 (Asp-Ser-Phe) near the carboxy-terminus of P450c17. This deletion creates a BclI site in the mutant DNA, permitting accurate demonstration that the patient was homozygous for this lesion, whereas one parent and two siblings were heterozygous. By use of site-directed mutagenesis, we created a vector that could express this mutated form of P450c17 when transfected into non-steroidogenic COS-1 cells. Such transfected cells produced immunodetectable P450c17 protein, but had no 17 alpha-hydroxylase or 17,20-lyase activity, whereas cells similarly transfected with a vector expressing normal human P450c17 could 17 alpha-hydroxylate either pregnenolone or progesterone and convert 17 alpha-hydroxypregnenolone to dehydroepiandrosterone, showing the presence of both activities. This is the first report of the molecular genetic basis of 17 alpha-hydroxylase deficiency in a Southeast Asian patient.

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Crossref · 10.1210/jcem.77.2.8345056

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Authors
Fardella, C. E., Zhang, L. H., Mahachoklertwattana, P., Lin, D., & Miller, W. L.
Affiliations
University of California, San Francisco (US)
Venue
The Journal of Clinical Endocrinology & Metabolism
Published
1993-08
Volume
77
Issue
2
Pages
489-493
ISSN
  • 0021-972X (ISSN-L)
  • 1945-7197
OpenAlex
W2041534377
Cited by
72
References
22
Citations by year
2025: 1 · 2024: 1 · 2023: 2 · 2022: 3 · 2021: 1 · 2020: 3 · 2018: 3 · 2017: 3 · 2016: 4 · 2015: 6 · 2014: 2 · 2013: 3 · 2012: 3
FWCI
0.26
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (1f05tw004604-01, 5r01dk042154-09)
  • Fogarty International Center (F05-TW04604)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK-37922, DK 42154, R01DK037922)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Sexual Differentiation and Disorders
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal Regulation and Hypertension
Keywords
17-hydroxylase deficiency, P450c17, CYP17 gene, 17,20-lyase activity, cortisol production, sex steroid biosynthesis, mineralocorticoid excess, hypertension, congenital adrenal hyperplasia, homozygous mutation, site-directed mutagenesis
MeSH terms
Adolescent, Adrenal Hyperplasia, Congenital, Aldehyde-Lyases, Amino Acid Sequence, Base Sequence, Cytochrome P-450 Enzyme System, DNA, Female, Homozygote, Humans, Hypertension, Hypokalemia, Molecular Sequence Data, Pregnanediol, Pregnanetriol, 17-Hydroxycorticosteroids, Blotting, Southern, Blotting, Western, Polymerase Chain Reaction, Mutagenesis, Site-Directed, Sequence Deletion

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