Abstract
The UTF1 is a transcriptional coactivator expressed mainly in pluripotent embryonic stem cells. Here, we have isolated a genomic DNA fragment carrying the UTF1 gene and found that the gene contains two exons interrupted by a short intron. The gene possesses four GC boxes, but no TATA box in the 5′-flanking region. This is reminiscent of a housekeeping gene type promoter and the functional relevance of these motifs is confirmed by the transient transfection analyses. As to the gene product, our analyses have led to the identification of two different species. One of them corresponds to the full-length protein, while the other is produced by utilizing the second methionine codon for the translation initiation. The oligo-capping analyses reveal multiple transcription start sites. Interestingly, some of them are localized downstream of the first methionine codon, indicating that such transcripts produce a protein starting from the second methionine codon. Chromosomal mapping analyses locate the gene at 7F5, the syntenic region of the human chromosome (10q26) where the human UTF1 gene is located.
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