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The USF Proteins Regulate Transcription of the Follicle-Stimulating Hormone Receptor but Are Insufficient for Cell- Specific Expression

Department of Molecular and Integrative Physiology (L.L.H., M.A.F.D., J.k.C.) The University of Kansas Medical Center Kansas City, Kansas 66160
The Department of Molecular Genetics (M.S.) The University of Texas M.D. Anderson Cancer Center Houston, Texas 77030

Expression of the FSH receptor (FSHR) is limited to granulosa cells of the ovary and Sertoli cells of the testis. Previous studies showed that an E box in the proximal promoter of the FSHR gene is required for transcription and that the predominant E box binding proteins are the ubiquitous transcription factors, upstream stimulatory factor 1 (USF1) and USF2. Through cotransfection analysis, we have shown that both wild-type and dominant negative forms of the USF proteins regulate the rat FSHR promoter and that transcriptional activation of FSHR required several domains within the amino-terminal portion of the USF proteins. Analysis of the FSHR promoter region using in vivo genomic footprinting indicated that the E box is occupied by proteins in Sertoli cells but not in cells that fail to express the receptor, despite the presence of the USF proteins. To help delineate the regions of the rat FSHR gene required for correct spatial and temporal expression, transgenic mice harboring two constructs containing variable amounts of 5'-flanking sequence (5,000 bp and 100 bp) were generated. Examination of 16 different transgenic lines revealed varied transgene expression profiles with multiple lines having different amounts of ectopic expression and two lines failing to express the transgene. In addition, little or no expression was observed in Sertoli cells. These studies indicate that additional regulatory sequences outside the region from -5,000 to +123 bp are needed for proper expression in Sertoli cells.

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