We have previously shown that the promoter of the Wnt target gene SP5 is strongly regulated by the C-clamp in a Helper site-dependent manner and therefore as expected, dnTCF1EWT showed strong binding to the SP5 promoter, whereas dnTCF1Emut showed weak, barely significant binding to the promoter (Figure 2D ) ( 15 ).
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The TCF C-clamp DNA binding domain expands the Wnt transcriptome via alternative target recognition.
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