Abstract
FAT10 is a member of the ubiquitin-like modifier family of proteins and has been implicated to play important roles in antigen presentation, cytokine response, apoptosis and mitosis. We have recently demonstrated the upregulation of FAT10 gene expression in 90% of hepatocellular carcinoma patients. Here, we identified and characterized the promoter of the FAT10 gene to elucidate the mechanism of FAT10 gene expression. Notably, we found that the 5′ untranslated region (5′UTR), from the transcription start site to 15 bases before the translational start site, displays significant promoter activity. Regions upstream of the 5′UTR (from +26 to −1997) do not confer any promoter activity. Curiously, FAT10 promoter activity and expression is significantly repressed in KB3-1 and HepG2 cells, which have wild-type p53, than in p53-negative Hep3B cells. The role of p53 in regulating FAT10 expression was evident by the significant downregulation (P<0.05) of FAT10 mRNA expression and promoter activity when wild-type p53 was transfected into p53-null Hep3B cells. Conversely, inhibiting p53 expression through siRNA against p53 significantly enhanced FAT10 expression and promoter activity. p53 was found to bind in vivo to the 5′ half consensus sequence of p53-binding site located at the FAT10 promoter. Hence, we propose that FAT10 is a downstream target of p53 and dysregulation of FAT10 expression in p53-defective cells could contribute to carcinogenesis.
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Acknowledgements
This work was supported by grants from the Biomedical Research Council (BMRC), National Medical Research Council (NMRC), Singapore and the SingHealth Cluster Research Fund to Caroline GL Lee.
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Zhang, D., Jeang, KT. & Lee, C. p53 negatively regulates the expression of FAT10, a gene upregulated in various cancers. Oncogene 25, 2318–2327 (2006). https://doi.org/10.1038/sj.onc.1209220
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DOI: https://doi.org/10.1038/sj.onc.1209220
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