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Related Experiment Videos

Structure of genes encoding steroidogenic enzymes.

W L Miller1

  • 1Department of Pediatrics, University of California, San Francisco 94143.

Journal of Steroid Biochemistry
|January 1, 1987
PubMed
Summary

The synthesis of adrenal steroid hormones involves four key cytochrome P450 enzymes. Genetic defects in the P450c21 gene cause congenital adrenal hyperplasia, a common genetic disorder.

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Area of Science:

  • Biochemistry
  • Endocrinology
  • Genetics

Background:

  • Adrenal steroid hormone synthesis from cholesterol involves five enzymes, with four being specific cytochrome P450 forms.
  • These cytochrome P450 enzymes have been isolated and their activities reconstituted in vitro, demonstrating catalytic versatility.

Purpose of the Study:

  • To detail the enzymes involved in adrenal steroidogenesis.
  • To describe the genetic basis and chromosomal localization of key human cytochrome P450 enzymes.
  • To investigate the role of P450c21 gene variations in congenital adrenal hyperplasia.

Main Methods:

  • Gene and complementary DNA cloning for human P450scc, P450c17, and P450c21.
  • Sequence analysis to determine evolutionary relationships between P450 enzymes.
  • Chromosomal mapping of human P450 genes.
  • Comparative analysis of P450c21 gene copy number across species.

Main Results:

  • Human P450scc, P450c17, and P450c21 genes have been cloned.
  • Sequence homology reveals closer relationships between P450c17 and P450c21 than with P450scc.
  • P450scc, P450c17, and P450c21 genes are located on chromosomes 15, 10, and 6, respectively.
  • Humans and mice possess two P450c21 genes, with one active copy, while cattle may have two active copies.
  • Lesions in the human P450c21(B) gene are linked to congenital adrenal hyperplasia.

Conclusions:

  • Cytochrome P450 enzymes are central to adrenal steroidogenesis.
  • The genetic organization and chromosomal locations of these enzymes provide insights into their regulation and evolution.
  • Mutations in the P450c21 gene are a significant cause of congenital adrenal hyperplasia, highlighting its clinical importance.

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