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Enhancers regulate the expression of target genes across large genomic distances, but it is unclear how recently discovered topological domains affect this regulation. Reporting in this issue of Developmental Cell, Symmons et al. (2016) show that the endogenous Shh topological domain promotes functional interactions between Shh and its remote enhancer.
Enhancers can stimulate transcription by a number of different mechanisms which control different stages of the transcription cycle of their target genes, from recruitment of the transcription machinery to elongation by RNA polymerase. These mechanisms may not be mutually exclusive, as a single enhancer may act through different pathways by binding multiple transcription factors. Multiple enhancers...
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