Projects per year
Enhancers can regulate the promoters of their target genes over very large genomic distances. It is widely assumed that mechanisms of enhancer action involve the reorganization of three-dimensional chromatin architecture, but this is poorly understood. The predominant model involves physical enhancer-promoter interaction by looping out the intervening chromatin. However, studying the enhancer-driven activation of the Sonic hedgehog gene (Shh), we have identified a change in chromosome conformation that is incompatible with this simple looping model. Using super-resolution 3D-FISH and chromosome conformation capture, we observe a decreased spatial proximity between Shh and its enhancers during the differentiation of embryonic stem cells to neural progenitors. We show that this can be recapitulated by synthetic enhancer activation, is impeded by chromatin-bound proteins located between the enhancer and the promoter, and appears to involve the catalytic activity of poly (ADP-ribose) polymerase. Our data suggest that models of enhancer-promoter communication need to encompass chromatin conformations other than looping.
|Number of pages||19|
|Early online date||4 Sep 2019|
|Publication status||Published - 7 Nov 2019|
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- 2 Finished
1/04/18 → 31/03/23
MC_UU_00007/2 The role of spatial nuclear organisation in genome function
1/04/18 → 1/04/23
- Deanery of Molecular, Genetic and Population Health Sciences - Director of Human Genetics Unit
- MRC Human Genetics Unit
Person: Academic: Research Active