Chromatin architecture (3D genome)

Chromatin architecture refers to the complex three-dimensional organization of the genome within the nucleus, which is essential for coordinating gene expression by facilitating spatial interactions between distal regulatory elements like enhancers and their target promoters (Nature Reviews Genetics, 2020). This organization is hierarchical, consisting of chromatin loops, Topologically Associating Domains (TADs), and large-scale A/B compartments that define active and inactive genomic regions. In various diseases, particularly cancer, these structures are frequently disrupted through mutations in architectural proteins like CTCF or cohesin, or through the creation of 'neo-loops' that drive oncogene expression via enhancer hijacking (Science, 2016). Therapeutic strategies targeting chromatin architecture involve small molecules and PROTACs that modulate epigenetic readers, writers, and erasers to restore healthy genomic conformations or disrupt pathological interactions (Nature, 2018). As a high-level regulatory target, the 3D genome offers a sophisticated approach to precision medicine by addressing the structural basis of dysregulated gene expression patterns (Cell, 2019).

Other names

3D genome organizationHigher-order chromatin structureTopologically Associating Domains (TADs)Chromatin loopsNuclear architectureSpatial genome organization

Modulation of enhancer-promoter interactions and restoration of chromatin boundaries through the inhibition or degradation of architectural and epigenetic proteins such as BET bromodomains, HDACs, and EZH2.