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The multiple murine 3 beta-hydroxysteroid dehydrogenase isoforms: structure, function, and tissue- and

A H Payne1, I G Abbaszade, T R Clarke

  • 1Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, USA.

Steroids
|January 1, 1997
PubMed
Summary
This summary is machine-generated.

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The mouse genome contains seven 3 beta-hydroxysteroid dehydrogenase (3 beta-HSD) genes, with five isoforms (I-V) exhibiting distinct tissue and developmental expression patterns. Isoforms I-III are involved in steroid biosynthesis, while IV and V likely inactivate steroid hormones.

Area of Science:

  • Biochemistry
  • Genetics
  • Endocrinology

Background:

  • The enzyme 3 beta-hydroxysteroid dehydrogenase (3 beta-HSD) is crucial for synthesizing all active steroid hormones.
  • Five distinct mouse isoforms (I-V) of 3 beta-HSD have been identified, each with unique characteristics.

Purpose of the Study:

  • To characterize the tissue-specific and developmental expression of 3 beta-HSD isoforms in mice.
  • To investigate the functional roles and genomic organization of the Hsd3b gene family.

Main Methods:

  • Analysis of isoform expression in various adult and fetal tissues.
  • Mapping of Hsd3b genes using yeast artificial chromosome (YAC) libraries and Southern blot analysis.
  • Genomic DNA analysis via pulse field gel electrophoresis.

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Main Results:

  • Isoforms I, II, and III function in steroid biosynthesis, while IV and V are involved in steroid inactivation.
  • Distinct expression patterns observed: 3 beta-HSD I in adrenal glands and gonads; II and III in liver and kidney; IV in kidney; V in male liver.
  • Fetal liver predominantly expresses 3 beta-HSD I, transitioning to III postnatally.
  • The Hsd3b gene family, comprising seven genes/pseudogenes, is located within a 400-kb region on mouse chromosome 3.

Conclusions:

  • The mouse liver expresses four 3 beta-HSD isoforms (I, II, III, V) dynamically during development.
  • The Hsd3b gene family exhibits a compact genomic organization.
  • Differential expression of 3 beta-HSD isoforms contributes to the complex regulation of steroid hormone metabolism.