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Proc Natl Acad Sci U S A. 2009 Jul 21;106(29):11913-8. doi: 10.1073/pnas.0812138106. Epub 2009 Jul 1.

Independent elaboration of steroid hormone signaling pathways in metazoans.

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1
Molecular Zoology Team, Institut de Génomique Fonctionnelle de Lyon, Université de Lyon, Université Lyon 1 and Centre National de Recherche Scientifique, Institut National de Recherche Agronomique, Ecole Normale Supérieure de Lyon, Lyon Cedex 07, France.

Abstract

Steroid hormones regulate many physiological processes in vertebrates, nematodes, and arthropods through binding to nuclear receptors (NR), a metazoan-specific family of ligand-activated transcription factors. The main steps controlling the diversification of this family are now well-understood. In contrast, the origin and evolution of steroid ligands remain mysterious, although this is crucial for understanding the emergence of modern endocrine systems. Using a comparative genomic approach, we analyzed complete metazoan genomes to provide a comprehensive view of the evolution of major enzymatic players implicated in steroidogenesis at the whole metazoan scale. Our analysis reveals that steroidogenesis has been independently elaborated in the 3 main bilaterian lineages, and that steroidogenic cytochrome P450 enzymes descended from those that detoxify xenobiotics.

PMID:
19571007
PMCID:
PMC2715501
DOI:
10.1073/pnas.0812138106
[Indexed for MEDLINE]
Free PMC Article
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