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• W4386520612 abstract "ABSTRACT While the elements encoding enhancers and promoters have been relatively well studied, the full spectrum of insulator elements which bind the CCCTC binding factor (CTCF), is relatively poorly characterised. This is partly due to the genomic context of CTCF sites greatly influencing their roles and activity. Here we have developed an experimental system to determine the ability of consistently sized, individual CTCF elements to interpose between enhancers and promoters and thereby reduce gene expression during differentiation. Importantly, each element is tested in the identical location thereby minimising the effect of genomic context. We found no correlation between the ability of CTCF elements to block enhancer-promoter activity with the amount of CTCF or cohesin bound at the natural genomic sites of these elements; the degree of evolutionary conservation; or their resemblance to the consensus core sequences. Nevertheless, we have shown that the strongest enhancer-promoter blockers include a previously described bound element lying upstream of the CTCF core motif. In addition, we found other uncharacterised DNaseI footprints located close to the core motif that may affect function. We have developed an assay of CTCF sequences which will enable researchers to sub-classify CTCF elements in a uniform and unbiased way." @default.
• W4386520612 created "2023-09-08" @default.
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• W4386520612 date "2023-09-06" @default.
• W4386520612 modified "2023-10-02" @default.
• W4386520612 title "The characteristics of CTCF binding sequences contribute to enhancer blocking activity" @default.
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• W4386520612 doi "https://doi.org/10.1101/2023.09.06.556325" @default.
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