Biol Reprod 2009 SSR Annual Meeting Abstracts
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Biology of Reproduction, Vol 56, 160-168, Copyright © 1997 by Society for the Study of Reproduction

ARTICLES

A binding site for steroidogenic factor-1 is part of a complex enhancer that mediates expression of the murine gonadotropin-releasing hormone receptor gene

DL Duval, SE Nelson and CM Clay
Department of Physiology, College of Veterinary Medicine, Colorado State University, Fort Collins 80523, USA.

Expression of the GnRH receptor (GnRH-R) gene in the anterior pituitary gland, as with the genes encoding the gonadotropin subunits, is restricted to gonadotrophs. Thus, it is conceivable that a common mechanism is involved in activating cell-specific expression of these genes. In fact, expression of the alpha- and LHbeta-subunit genes appears to require binding of the nuclear orphan receptor, steroidogenic factor-1 (SF-1). Here we have used DNA protein-binding assays to identify a high-affinity binding site for SF-1 in the proximal promoter of the murine GnRH-R gene. Southwestern blot analysis using this site as a radiolabeled probe revealed binding to a 53-kDa protein in alphaT3-1 cell extracts. Furthermore, mutation of this site led to a 58% reduction in promoter activity in the gonadotroph-derived alphaT3-1 cell line. Thus, SF-1 may represent at least one common pathway for gonadotroph-specific gene expression. In addition, we used block-replacement mutagenesis to functionally scan approximately 100 base pairs (bp) in a region that we had previously identified as critical for cell-specific promoter activity. Mutation of a partial palindrome located at -393 bp relative to the start of translation led to a 63% loss of promoter activity. Finally, a region containing both the SF-1 binding site and the -393 site was sufficient to stimulate cell-specific expression from a heterologous, minimal promoter. Thus, we suggest that a complex enhancer that includes a binding site for SF- 1 mediates cell-specific expression of the GnRH-R gene.


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