Ma J, Liu QH, Wang BB, Liao SY, Sha WH, Wang QY. Construction of a reporter vector regulated by the
Pdx1 promoter and evaluation of the effect of DNA methylation on
Pdx1 promoter activity in gastric cancer cells.
Shijie Huaren Xiaohua Zazhi 2011;
19:3222-3228. [DOI:
10.11569/wcjd.v19.i31.3222]
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Abstract
AIM: To construct a reporter vector regulated by the Pdx1 promoter to determine the effect of DNA methylation on the promoter activity of Pdx1 gene.
METHODS: PCR amplification was performed to obtain nine potential Pdx1 promoter fragments, which were then cloned into the pGL3-basic vector to obtain recombinant pGL3-Pdx1 constructs. Promoter activity of different Pdx1 fragments in gastric cancer cells was detected by luciferase assay to identify the potential promoter area. The activity of the Pdx1 promoter with or without SssI methylase treatment was also evaluated by luciferase assay.
RESULTS: Luciferase assay showed that three fragments (F383, F720 and F1039), all of which contained the F383 sequence, had stronger promoter activity than pGL3-basic control. The promoter activity of these three fragments decreased significantly after SssI methylase treatment (all P < 0.05).
CONCLUSION: A luciferase reporter gene system containing the Pdx1 promoter was successfully constructed. F383 is the potential core area of the Pdx1 promoter. These results provide a basis for studying the epigenetic mechanism of Pdx1 gene silencing in gastric cancer.
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