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Enhancers are remotely located noncoding DNA sequences that regulate gene expression in response to developmental, homeostatic, and environmental cues. Canonical short-range enhancers located 400 kb) enhancers rely on additional mechanisms, including cohesin, CCCTC-binding factor, and high-affinity protein-protein interactions. These mechanisms are crucial for establishing the physical proximity and interaction between enhancers and their target promoters over extended genomic distances and ensuring robust gene activation during mammalian development. Future studies will be critical to unravel their prevalence and evolutionary significance across various genomic loci, cell types, and species.
Bower et al. (Fri,) studied this question.