1 outline Generation Generation of of the the CRISPR/Cas9-mediated CRISPR/Cas9-mediated knock-in knock-in system system targeting targeting the the promoter promoter of of Oct4 Oct4 Transcriptional regulation of Oct4 gene expression via HDR-mediated gene correction Combinatorial alteration of the CpG sites in CR1 and the upper promoter region Effects of targeted demethylation using dCas9-Tet1 modules on Oct4 gene activation Synergetic effects of altered histone modifications and DNA methylation on Oct4 expression 2 Generation of the CRISPR/Cas9-mediated knock-in system targeting the promoter of Oct4 Research object:Oct4 promoter in NIH3T3 cells Transcriptional regulation of Oct4 gene expression via HDR-mediated gene correction Combinatorial alteration of the CpG sites in CR1 and the upper promoter region Effects of targeted demethylation using dCas9-Tet1 modules on Oct4 gene activation Significant increase of Oct4 mRNA was not also observed in a cell clone with a stable overexpression of sgRNA1/dCas9Tet1 Synergetic effects of altered histone modifications and DNA methylation on Oct4 expression DNMT: DNA 甲基转移酶 Apicidin:组蛋白脱乙酰基 酶抑制剂 UNC0638:组蛋白甲基转 移酶抑制剂 The dCas9-Tet1 system can effectively activate a transcriptionally quiescent gene via targeted DNA demethylation, when supplemented by both histone H3 acetylating- and Histone H3K9 demethylating-agents.