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• W2134331077 abstract "Abstract The Leydig insulin-like gene (Ley I-L), a member of the insulin-related gene family, is specifically expressed in pre- and postnatal Leydig cells of the testis and in postnatal theca cells of the ovary. To determine the functional region of the mouse Ley I-L promoter and factors controlling the Ley I-L gene expression, we used 2.1 kb of the 5′-flanking region of the mouse Ley I-L gene to generate chimeric constructs with the chloramphenicol acetyltransferase gene (CAT). Transient transfections of MA10 Leydig cells, LTK− fibroblasts, and F9 embryonic cells by a series of 5′-deleted mouse Ley I-L promoter-CAT constructs revealed that the sequence between nucleotides −157 to +4 directs the transcription of the reporter gene in MA10 but not in LTK− and F9 cells, indicating that the determinants of Leydig cell-specific expression reside within this region. Deoxyribonuclease I (DNase I) footprint analysis revealed that the sequences designated SF-1/1, SF-1/2, and SF-1/3 within three DNase I-protected regions are homologous to the consensus binding site of the steroidogenic factor-1 (SF-1). Competition and antibody studies showed that the three SF-1-binding sites in the Ley I-L promoter have similar binding affinities for SF-1. Furthermore, transient transfections of MA10 cells with mutant reporter constructs, in which SF-1/1 or both SF-1/2 and SF-1/3 were deleted, demonstrated that all three SF-1- binding sites are required for SF-1-mediated stimulation of Ley I-L transcription. Cotransfection of an SF-1-containing expression vector together with a Ley I-L promoter-CAT construct into HeLa cells, which lack the endogenous SF-1 protein, resulted in CAT gene transcription, which indicated that SF-1 can transactivate the Ley I-L promoter. These data demonstrate an essential role of SF-1 in transcriptional activation of the Ley I-L promoter." @default.
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• W2134331077 date "1998-05-01" @default.
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• W2134331077 title "Transcription of the Leydig Insulin-Like Gene Is Mediated by Steroidogenic Factor-1" @default.
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• W2134331077 doi "https://doi.org/10.1210/mend.12.5.0107" @default.
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