Mitotic chromosomes: from the chromosome scaffold model to condensins and physical forces.

Condensins, topoisomerase IIα, and physical forces collectively drive mitotic chromosome assembly through dynamic looping and entanglement processes.

• Why it matters: Understanding chromosome organization during mitosis is essential for insights into genetic stability and cell division, yet fundamental mechanisms remain unclear.
• What they did: The authors review evidence from biochemistry, imaging, and genomics, highlighting the roles of condensin-mediated looping, topoIIα activity, and physical forces such as electrostatic interactions and depletion attraction in chromosome assembly.
• The result: This work suggests that interphase chromatin domains act as dynamic building blocks of mitotic chromosomes, advancing the understanding of chromosome structure and the forces shaping it.