4C-seq from viewpoint at MYC promoter (VP-MYC1 and VP-MYC2), in wild type (Hap) and variously modified alleles around the locus in human iPS cells.. 4C-seq from viewpoint at MYC promoter (VP-MYC1 and VP-MYC2), in wild type (Hap) and variously modified alleles around the locus in human iPS cells.

We reconstituted arrays of CTCF binding sites (L1, L2, L3, L4, R1, R2 and R3) and devised a synthetic topological insulator with tetO for chromatin-engineering (STITCH). By coupling STITCH with tetR linked to the KRAB domain to induce heterochromatin and disable the insulation, we developed a drug-inducible system to control gene activation by enhancers. We inserted STITCH into five different positions of the remaining allele of the locus: \"STITCH+30kb\", \"STITCH+440kb\", \"STITCH+1760kb\" and \"STITCH+1790kb\" have the STITCH insertions away from the MYC promoter for the indicated distances to the telomeric side of the p arm of the chromosome. \"STITCH-30kb\", at the 30-kb upstream from the MYC. We also made a deletion clone of the enhancer region, termed del(30-440). We made deletion of each CTCF array, L (delL) and R (delR), inversion of R (invR), deletion of the middle five binding sites from L2 to R2 (del(L2-R2)), and deletion of the six sites but for R3 (del(L1-R2)) in STITCH+30kb. We also obtained deletion and inversion of the whole of STITCH (del(L1-R3) and inv(L1-R3)). We integrated a transgene consisting of tetR-KRAB followed by DNA encoding the 2A peptide and the puromycin resistant gene with piggyBac transposition into the genome in the STITCH+30kb clone (STITCH/KRAB). We performed 4C-seq (Circular chromatin conformation capture assay followed by deep-sequencing) from the MYC promoter as a viewpoint to see how STITCH impacts on the chromatin conformation.