Defining genome architecture at base-pair resolution
- PMID: 34108683
- DOI: 10.1038/s41586-021-03639-4
Defining genome architecture at base-pair resolution
Abstract
In higher eukaryotes, many genes are regulated by enhancers that are 104-106 base pairs (bp) away from the promoter. Enhancers contain transcription-factor-binding sites (which are typically around 7-22 bp), and physical contact between the promoters and enhancers is thought to be required to modulate gene expression. Although chromatin architecture has been mapped extensively at resolutions of 1 kilobase and above; it has not been possible to define physical contacts at the scale of the proteins that determine gene expression. Here we define these interactions in detail using a chromosome conformation capture method (Micro-Capture-C) that enables the physical contacts between different classes of regulatory elements to be determined at base-pair resolution. We find that highly punctate contacts occur between enhancers, promoters and CCCTC-binding factor (CTCF) sites and we show that transcription factors have an important role in the maintenance of the contacts between enhancers and promoters. Our data show that interactions between CTCF sites are increased when active promoters and enhancers are located within the intervening chromatin. This supports a model in which chromatin loop extrusion1 is dependent on cohesin loading at active promoters and enhancers, which explains the formation of tissue-specific chromatin domains without changes in CTCF binding.
Comment in
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A base-pair view of interactions between genes and their enhancers.Nature. 2021 Jul;595(7865):36-37. doi: 10.1038/d41586-021-01494-x. Nature. 2021. PMID: 34108721 No abstract available.
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High-resolution 3D genome characterization.Nat Rev Genet. 2021 Aug;22(8):481. doi: 10.1038/s41576-021-00391-3. Nat Rev Genet. 2021. PMID: 34183827 No abstract available.
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