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FEBS Lett. 2002 Feb 13;512(1-3):223-6.

The characterization of the human Siah-1 promoter(1).

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Department of Preventive Medicine, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamigyo-ku, 602-8566, Kyoto, Japan.


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.

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