Gata4 regulates testis expression of Dmrt1.


:The doublesex and mab-3 related transcription factor 1 (Dmrt1) is a putative transcriptional regulator that is expressed exclusively in the gonads and is required for postnatal testis differentiation. Here we describe the transcriptional mechanisms regulating testis-specific expression of the Dmrt1 gene. Transient-transfection analysis identified a region of the promoter between kb -3.2 and -2.8 that is important for Sertoli cell-specific expression. DNase I footprinting revealed four sites of DNA-protein interaction within this region, three of which were prominent in primary Sertoli cells. Analysis of these sites, using electrophoretic mobility shift assays, revealed that Gata4 and another unknown factor bound within these regions. Further transient-transfection assays of various mutant promoters established the functional relevance of the Gata4-response and unknown factor-response elements, while studies of Dmrt1 expression in 13.5 days postcoitum Fog2 null gonads supported the in vivo importance of Gata4's regulation. As a whole, these studies identify Gata4 as an important regulator in the Dmrt1 transcriptional machinery that is responsible for robust expression of Dmrt1 in the testis.


Mol Cell Biol


Lei N,Heckert LL




Has Abstract


2004-01-01 00:00:00












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