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Supplementary figures.A- Qualitative PCR for KLF6 and its splice variants in different hepatic cell lines using primers that permit amplifications of KLF6 and SV variants. PCR products were visualized after agarose gel electrophoresis and ethidium bromide staining. The graph represents the expression of KLF6 splice variants determined by semi-quantitative RT-PCR. Results are expressed as a percentage of KLF6 mRNA expression. The results represent the mean of three different amplifications. B- Expression of p53 mRNA in IHH (left graph) and HepG2 (right graph) stable cell lines by qRT-PCR. Results represent the mean of three amplifications and are calculated using the 2exp(-Ct) formula. p53 mRNA level in IHH-GFP and HepG2 cells is used as control. C- Expression MDM2 protein in IHH (left panel) and HepG2 (right panel) stable cell lines by Western blot. The gels are representative of three analyses D- Proliferation of Hep3B and Hep3B-SV2 cell lines. After adherence, cells were counted (time 0) and then at every 24h interval until 72h. The graph represents the cell population growth compared to the population at time 0 (expressed as 1). The results represent the mean of three experiments. E- Percentage of cells in the different phases of the cell cycle measured by flow cytometry. Each panel is representative of three analyses. The graph represents the average percentage of cells in the different phases of the cell cycle obtained from three analyses. F- Representation of SV2 expression relatively to KLF6 expression in HCC vs ST in 28 patients. Results are expressed as the ratio SV2/KLF6 expression in HCC vs ST.G- Overall KLF6 mRNA level in normal liver (Normal n=5), surrounding cirrhotic tissues (Cirr n=28) and HCC samples (n=30) measured by qRT-PCR. Results are the mean of three different amplifications and are expressed as 2exp –Ct. N.S. stands for Not Significant. H- KLF6 mRNA expression in 28 patients measured by qRT-PCR. For each patients, KLF6 mRNA level in the tumor is represented as fold change compared to the ST. The values represent the mean (±SEM) of three different quantifications performed in triplicate. For technical reasons, results for samples #17 and #30 could not be obtained. I- Top graph: Representation of SV1 expression relatively to KLF6 expression in HCC vs ST in 28 patients. Results are expressed as the ratio SV1/KLF6 expression in HCC vs ST. Bottom graph: Overall SV1 mRNA level in normal liver (Normal n=5), surrounding cirrhotic tissues (Cirr n=28) and HCC samples (n=30) measured by qRT-PCR. Results are the mean of three different amplifications and are expressed as 2exp –Ct. * p < 0.05. J- Expression of the splice variants SV1 and SV3 in response to SV2 cDNA over-expression by qRT-PCR. SV1 and SV3 expression was measured in IHH-SV2 (left panel) and HepG2-SV2 (right panel) and compared to its level in IHH-GFP, HepG2-GFP and Hep3B cell lines, respectively. Results are the mean of three different amplification and are calculated using the 2exp(-DDct) formula. SV2 mRNA level in IHH-GFP and HepG2-GFP is used as control. N.S. stands for Not Significant..