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Volume 616 Issue 7958, 27 April 2023

Loop feedback

In eukaryotes, the protein complex cohesin plays a key role in folding genomic DNA by extruding the DNA into loops. An important element in this process is the DNA-binding protein CTCF, which has been proposed to regulate loop formation. In this week’s issue, Jan-Michael Peters, Cees Dekker and their colleagues shed light on the mechanism behind CTCF’s action. The researchers visualized interactions between single molecules of CTCF (shown in pink on the cover) and cohesin (blue) in vitro, finding that CTCF is sufficient to block loop extrusion by cohesin. They also found that not only does CTCF halt loop extrusion in an orientation-dependent manner, but it also sometimes causes the loops to shrink or changes the direction in which they grow. Crucially, this regulatory role of CTCF’s loop-extrusion blocking activity is itself controlled by the tension of the DNA to which the CTCF and cohesin are bound.

Cover image: Roman Barth, Cees Dekker Lab TU Delft

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