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Molecular and Cellular Biology, June 2006, p. 4111-4121, Vol. 26, No. 11
0270-7306/06/$08.00+0     doi:10.1128/MCB.00222-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Two-Step Regulation of Ad4BP/SF-1 Gene Transcription during Fetal Adrenal Development: Initiation by a Hox-Pbx1-Prep1 Complex and Maintenance via Autoregulation by Ad4BP/SF-1

Mohamad Zubair,1 Satoru Ishihara,1 Sanae Oka,1 Katsuzumi Okumura,2 and Ken-ichirou Morohashi1*

Division for Sex Differentiation, National Institute for Basic Biology, Myodaiji-cho, Okazaki 444-8787, Japan,1 Laboratory of Molecular and Cellular Biology, Department of Life Science, Faculty of Bioresources, Mie University, Tsu 514-8507, Japan2

Received 7 February 2006/ Returned for modification 12 March 2006/ Accepted 22 March 2006

The orphan nuclear receptor Ad4BP/SF-1 (adrenal 4 binding protein/steroidogenic factor 1) is essential for the proper development and function of reproductive and steroidogenic tissues. Although the expression of Ad4BP/SF-1 is specific for those tissues, the mechanisms underlying this tissue-specific expression remain unknown. In this study, we used transgenic mouse assays to examine the regulation of the tissue-specific expression of Ad4BP/SF-1. An investigation of the entire Ad4BP/SF-1 gene locus revealed a fetal adrenal enhancer (FAdE) in intron 4 containing highly conserved binding sites for Pbx-Prep, Pbx-Hox, and Ad4BP/SF-1. Transgenic assays revealed that the Ad4 sites, together with Ad4BP/SF-1, develop an autoregulatory loop and thereby maintain transcription, while the Pbx/Prep and Pbx/Hox sites initiate transcription prior to the establishment of the autoregulatory loop. Indeed, a limited number of Hox family members were found to be expressed in the adrenal primordia. Whether a true fetal-type adrenal cortex is present in mice remained controversial, and this argument was complicated by the postnatal development of the so-called X zone. Using transgenic mice with lacZ driven by the FAdE, we clearly identified a fetal adrenal cortex in mice, and the X zone is the fetal adrenal cells accumulated at the juxtamedullary region after birth.

* Corresponding author. Mailing address: Division of Sex Differentiation, National Institute for Basic Biology, Myodaiji-cho, Okazaki 444-8787, Japan. Phone: 81-564-59-5865. Fax: 81-564-59-5866. E-mail: moro{at}nibb.ac.jp.

Molecular and Cellular Biology, June 2006, p. 4111-4121, Vol. 26, No. 11
0270-7306/06/$08.00+0     doi:10.1128/MCB.00222-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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