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Developments in proximity ligation methods and sequencing technologies have provided high-resolution views of the organization of the genome inside the nucleus. A prominent feature of Hi-C maps is regions of increased self-interaction called topologically associating domains (TADs). Despite the strong evolutionary conservation and clear link with gene expression, the exact role of TADs and even their definition remains debatable. Here, I review the discovery of TADs, how they are commonly identified, and the mechanisms that lead to their formation. Furthermore, I discuss recent results that have created a more nuanced view of the role of TADs in the regulation of genes. In light of this, I propose that when we define TADs, we also consider the mechanisms that shape them.
Pubmed ID: 31654669
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Network service for comparing protein structures in 3D. You submit the coordinates of a query protein structure and Dali compares them against those in the Protein Data Bank (PDB). You receive an email notification when the search has finished. In favourable cases, comparing 3D structures may reveal biologically interesting similarities that are not detectable by comparing sequences. Requests can also be submitted by e-mail to dali-server at helsinki dot fi. The body of the e-mail message must contain atomic coordinates in PDB format. If you want to know the structural neighbours of a protein already in the Protein Data Bank (PDB), you can find them in the Dali Database. If you want to superimpose two particular structures, you can do it in the pairwise DaliLite server. Academic users may download the DaliLite program for local use.
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