Molecular Endocrinology, Vol 9, 1233-1239, Copyright © 1995 by Endocrine Society

ARTICLES

Steroidogenic factor 1 is the essential transcript of the mouse Ftz-F1 gene

X Luo, Y Ikeda, DA Schlosser and KL Parker
Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, USA.

Targeted disruption of the mouse Ftz-F1 gene, which encodes the orphan nuclear receptors steroidogenic factor 1 (SF-1) and embryonal long terminal repeat-binding protein (ELP), established that this gene is essential for development of the primary steroidogenic tissues and for male sexual differentiation. Associated with these dramatic developmental abnormalities, all Ftz-F1-disrupted mice died in the immediate postnatal period and had very low glucocorticoid levels. In this report, we show that treatment with corticosteroids markedly prolonged survival of the Ftz-F1-disrupted mice, proving that steroid hormone deficiency causes their death. We also generated SF-1-specific knockout mice with a targeting construct that specifically disrupted the SF-1 coding sequence without impairing the ELP protein. The phenotype of the SF-1-specific knockout mice was indistinguishable from that observed in Ftz-F1-disrupted mice that lack both SF-1 and ELP. Taken together, these results indicate that SF-1 is the Ftz-F1-encoded protein that is required for multiple aspects of endocrine development and for postnatal survival.

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