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Zebrafish 17beta-hydroxysteroid dehydrogenases: an evolutionary perspective.

R Mindnich¹, J Adamski

¹University of Pennsylvania, School of Medicine, Department of Pharmacology, 3620 Hamilton Walk, 135 John Morgan Building, Philadelphia, PA 19104, USA. mire@mail.med.upenn.edu

Molecular and Cellular Endocrinology

|December 30, 2008

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Enzymes called 17beta-hydroxysteroid dehydrogenases (17beta-HSDs) are crucial for steroid metabolism. Their evolutionary origins and conserved functions across species offer insights into steroid hormone action.

Area of Science:

Biochemistry
Evolutionary Biology
Molecular Endocrinology

Background:

17beta-hydroxysteroid dehydrogenase (17beta-HSD) enzymes catalyze key redox reactions at the C17 position of steroids.
Fourteen mammalian and nine zebrafish 17beta-HSD homologs have been identified, with some exhibiting dual roles in steroid and fatty acid metabolism.

Purpose of the Study:

To investigate the evolutionary origins of steroid-specific 17beta-HSD enzymes.
To explore the potential conservation of steroid hormone function in invertebrates.

Main Methods:

Bioinformatic analysis of 17beta-HSD sequences across species.
Comparative genomics to identify homologs in various organisms.
Enzyme activity assays to confirm steroid-converting capabilities.

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Main Results:

Multifunctional 17beta-HSD homologs are conserved across diverse species including flies, worms, and yeast.
Classical 17beta-HSDs (types 1, 2, 3) are steroid-specific and likely emerged early in vertebrate evolution.
Evidence suggests potential conservation of steroid hormone function in invertebrates via unknown mechanisms.

Conclusions:

The evolution of steroid-specific 17beta-HSDs enabled novel modes of steroid hormone action in vertebrates.
Further research is needed to elucidate the mechanisms of steroid hormone function in invertebrates.