Comparative analysis of human, bovine, and murine Oct-4 upstream promoter sequences

Mammalian Genome : Official Journal of the International Mammalian Genome Society
V NordhoffH R Schöler

Abstract

The Oct-4 gene encodes a transcription factor that is specifically expressed in embryonic stem cells and germ cells of the mouse embryo. Cells that differentiate into somatic tissues lose Oct-4 expression. Regulation of Oct-4 gene transcription involves a TATA-less minimal promoter and two upstream elements: the proximal (PE) and distal enhancers (DE). We report here the nucleotide sequence of the 5' upstream regulatory regions of the human and murine Oct-4 genes. A comparative alignment analysis between these regions and those of the bovine Oct-4 ortholog reveals four conserved regions of homology (CR 1 to 4) between these species (66-94% conservation). The 1A sequence within the mouse PE is located approximately half-way between CR 2 and CR 3. A putative Sp1/Sp3 binding site and the overlapping hormone responsive element (HRE) in CR1 are identical in all three species. A high number of CCC(A/T)CCC motifs exhibit various levels of homology in these upstream regions. We discuss the importance of these and other sequences and present candidate factors that may bind and regulate Oct-4 gene expression.

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