The characterization of the human Siah-1 promoter(1).
Siah-1, the human homologue of Drosophila seven in absentia, is related to apoptosis and tumor suppression. Although it was reported that the expression of Siah-1 is induced by p53 and p21/WAF1, little is known about the transcriptional regulation of the Siah-1 gene. To investigate the transcriptional regulation, we isolated and sequenced the genomic fragment of the Siah-1 promoter region. The Siah-1 promoter has no typical TATA box or CCAAT box. Transient transfection assays using reporter plasmids in which the promoter region of the Siah-1 gene was deleted or mutated showed that one Sp1 site was responsible for the basal promoter activity. In Northern blotting analysis, the expression of the Siah-1 gene was upregulated by p53, but activation of the reporter plasmid by the p53 co-transfection assay was not shown, suggesting that a p53 responsive element does not exist in the promoter region we examined in this study but might be present in another region.
Maeda
Ayaka
A
Department of Preventive Medicine, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, 602-8566, Kyoto, Japan.
Yoshida
Tatsushi
T
Kusuzaki
Katsuyuki
K
Sakai
Toshiyuki
T
D024506:5' Flanking Region / Q000235:genetics; D001483:Base Sequence; D001665:Binding Sites; D003001:Cloning, Molecular; D015536:Down-Regulation; D016158:Genes, p53; D006801:Humans; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000235:genetics*; D011401:Promoter Regions, Genetic; D016329:Sp1 Transcription Factor / Q000378:metabolism; D015533:Transcriptional Activation; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism; D044767:Ubiquitin-Protein Ligases; D000098563:Seven in Absentia Proteins
D009687:Nuclear Proteins; D016329:Sp1 Transcription Factor; D016159:Tumor Suppressor Protein p53; D044767:Ubiquitin-Protein Ligases; D000098563:Seven in Absentia Proteins