Characterization of complementary deoxyribonucleic acid for human adrenocortical 17α-hydroxylase: A probe for analysis of 17α-hydroxylase deficiency

K. D. Bradshaw, M. R. Waterman, R. T. Couch, E. R. Simpson, M. X. Zuber

Research output: Contribution to journalArticle

92 Scopus citations

Abstract

To provide a basis for investigation of the molecular mechanisms underlying the hormonal regulation of steroid 17α-hydroxylase (P-45017α) activity in adrenal, ovary, and testis as well as human 17α-hydrox-ylase deficiency, we have isolated from a human fetal adrenal cDNA library a cDNA sequence complementary to the mRNA that encodes the human P-45017α enzyme. Of 75,000 colonies from the library that were screened by use of a nick-translated 5'-specific bovine P-45017α cDNA probe, 10 positive colonies were isolated and the clone with the longest insert (pcD-17αH) was selected for further characterization. pcD-17αH encodes the complete human P-45017α protein having approximately 78% homology at the nucleotide level and 71% homology at the amino acid level when the sequence of pcD-17αH is compared to the bovine P-45017α cDNA sequence. By transient expression of the human P-45017α cDNA clone in COS 1 cells, we have demonstrated that the 17α-hydroxylase and 17, 20 lyase activities reside within the same human P-45017α polypeptide chain. The insert was also used as a probe to investigate, by means of Southern blot analysis, possible alterations in the P-45017α gene sequence in DNA isolated from skin fibroblasts from three patients with clinically characterized 17a-hydroxylase deficiencies. No changes were detected in the DNA of any of the patients by this analysis. (Molecular Endocrinology 1: 348-354, 1987).

Original languageEnglish (US)
Pages (from-to)348-354
Number of pages7
JournalMolecular Endocrinology
Volume1
Issue number5
DOIs
StatePublished - May 1987

ASJC Scopus subject areas

  • Molecular Biology
  • Endocrinology

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