Fig. 5

OCT1 binds to the CDX2 promoter and directly regulates its transcription. A Prediction of the binding sites of OCT1 to the promoter region of CDX2 by JASPAR database. B Potential binding sites and CDX2-promoter mutant constructs. C Dual-luciferase reporter assay to determine the relative luciferase activity of the CDX2 promoter (including wild-type and mutants). The luciferase assay was repeated for three times. D ChIP-qPCR to validate the binding of OCT1 to the CDX2 promoter region. The assay was repeated twice and represented as mean ± SD. Agarose gel electrophoresis showed the representative bands of two independent ChIP experiments. Significance Levels: *P < .05, **P < .01, ***P < .001, ns: non-significant