Long-range interactions between transcription factors
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Updated: Jun 9, 2026

Promoter Capture Hi-C: High-resolution, Genome-wide Profiling of Promoter Interactions
Published on: June 28, 2018
Yan Mei Wang1, Jonas O Tegenfeldt, Jim Sturm
1Department of Physics, Princeton University, Princeton, NJ 08544, USA.
Abstract:
We discuss a method for analysing the number of GFP-LacI fusion transcription factors bound to a construct of 256 contiguous LacI binding sites using photon bleaching statics. We show by using a combination of imaging of the construct in nanochannels, photon statistics and addition of IGFP that the binding coefficient of the LacI decreases with increasing occupation of the construct, with a binding coefficient of 10(-6) M when only 15 of the 256 possible sites are occupied. We model this effect by assuming that the GFP-LacI dimer introduces elastic strain into the helix by generalized deformations, and that this strain propagates over distances at least as large as the persistence length.
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