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- _5 wasQuotedFrom 15471867 provenance.
- _5 value "As a mechanism, a 2-fold decrease in the binding of the enhancer-blocking element CCCTC-binding factor (CTCF) within the intergenic IGF2-H19 region was found to underlie this switch to biallelic IGF2 expression in senescent cells. This decrease in CTCF binding was associated with reduced CTCF expression in senescent cells. No de novo increases in methylation at the IGF2 CTCF binding site were seen. The forced down-regulation of CTCF expression using small interfering RNA in imprinted prostate cell lines resulted in an increase in IGF2 expression and a relaxation of imprinting. " provenance.