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

Condensins, topoisomerase IIα, and physical forces collaboratively drive dynamic mitotic chromosome assembly, with condensin-mediated looping being central to the process.

• Why it matters: Understanding chromosome organization during mitosis is crucial for insights into genetic stability and cell division, yet the mechanisms remain incompletely understood.
• What they did: The authors review biochemical, imaging, and genomics evidence, highlighting the roles of condensins, topoIIα, and physical forces such as electrostatic interactions and depletion attraction in chromosome formation.
• The result: This work suggests that interphase chromatin domains act as flexible building blocks for mitotic chromosomes, advancing our understanding of chromosome architecture and its regulation during cell division.