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. 2004 Jun 1;380(Pt 2):455–463. doi: 10.1042/BJ20031610

Cloning and characterization of the human beta2-glycoprotein I (beta2-GPI) gene promoter: roles of the atypical TATA box and hepatic nuclear factor-1alpha in regulating beta2-GPI promoter activity.

Hsueh-Hsiao Wang 1, An-Na Chiang 1
PMCID: PMC1224180  PMID: 14984368

Abstract

Beta2-glycoprotein I (beta2-GPI) is a plasma glycoprotein primarily synthesized in the liver. The interindividual variability of beta2-GPI expression in subjects with various metabolic syndromes and disease states suggests that it may have clinical importance. However, the regulation of beta2-GPI gene expression has not been clarified. To gain more insight into the control of beta2-GPI gene expression, we cloned the 4.1-kb 5'-flanking region and characterized the proximal promoter of the beta2- GPI gene in this study. Cis -acting elements required for beta2-GPI promoter activity were identified with transient transfection assays in the hepatoma cell lines HepG2 and Huh7 and in non-hepatic HeLa cells. Serial deletion analyses of the beta2-GPI 5'-flanking sequence revealed that the region from -197 to +7 had strong promoter activity in hepatoma cells but not in HeLa cells. Truncation and site-directed mutagenesis of putative cis -elements within this region showing an atypical TATA box and a HNF-1 (hepatic nuclear factor-1) element were both essential for the beta2-GPI promoter activity. Subsequent gel mobility shift assays confirmed the interaction of HNF-1alpha with the HNF-1 site residing downstream of the TATA box. Co-transfection of beta2-GPI promoter-luciferase vector with HNF-1alpha expression vector in Huh7 and HNF-1-deficient HeLa cells demonstrated the transactivation effect of HNF-1alpha on beta2-GPI promoter activity. In addition, overexpression of HNF-1alpha enhanced the endogenous beta2-GPI expression. These results suggest that the atypical TATA box and HNF-1 cis-element are critical for beta2-GPI transcription and HNF-1alpha may play an important role in cell-specific regulation of beta2-GPI gene expression.

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Selected References

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