Nuclear factor-Y (NF-Y) regulates transcription of mouse Dmrt7 gene by binding to tandem CCAAT boxes in its proximal promoter.
Dmrt7, a member of the Dmrt family of genes, is required for spermatogenesis. However, promoter functions of the gene Dmrt7 remain unknown. We have cloned and characterized the proximal promoter region of the mouse Dmrt7 gene. Functional analysis of the 5' flanking region by sequential deletion mutations revealed crucial positive elements between -60 and +1, in which two highly conserved and tandem CCAAT boxes: the CCAAT box1 (-48/-44) and the CCAAT box2 (-7/-3) are located. Site-directed mutagenesis studies demonstrated that both CCAAT boxes are indispensable to the promoter activity. Electrophoretic mobility shift assays (EMSAs) and gel-supershift assays indicated that transcription factor NF-Y binds to the promoter. Chromatin immunoprecipitation (ChIP) analysis demonstrated that NF-Y interacts in vivo with the promoter of the Dmrt7 gene in testis. Co-transfection and reporter analysis showed that over-expression of NF-Ys increased transcription of the Dmrt7-luc gene whereas expression of a dominant-negative NF-Ya decreased the transcription. This suggests that NF-Y can activate the Dmrt7 promoter. These results provide evidence of a transcription regulatory mechanism that controls Dmrt7 gene expression in mouse testis.
Department of Genetics, College of Life Sciences, Wuhan University, Wuhan 430072, PR China.
Yu
Y
Hou
Xiang
X
Zhou
Jie
J
Liu
Jia
J
Yuan
Hanhua
H
Cheng
Rongjia
R
Zhou
D000818:Animals; D001665:Binding Sites / Q000235:genetics*; D015153:Blotting, Western; D023081:CCAAT-Binding Factor / Q000235:genetics / Q000378:metabolism*; D019556:COS Cells; D045744:Cell Line, Tumor; D002522:Chlorocebus aethiops; D047369:Chromatin Immunoprecipitation; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D024202:Electrophoretic Mobility Shift Assay; D005260:Female; D005786:Gene Expression Regulation / Q000235:genetics / Q000502:physiology; D006801:Humans; D008297:Male; D051379:Mice; D016133:Polymerase Chain Reaction; D011401:Promoter Regions, Genetic / Q000235:genetics*; D011485:Protein Binding / Q000235:genetics / Q000502:physiology; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*
D023081:CCAAT-Binding Factor; D004268:DNA-Binding Proteins; C516257:Dmrt7 protein, mouse; D014157:Transcription Factors; C402244:nuclear factor Y