Cryo-electron tomography reveals local organization of the human mitotic spindle
Published in Biology, Journals, Scanners and Imaging, Tools.
Published October 29, 2026.
Cryo-electron tomography is revealing how short microtubules organize into the machinery that separates chromosomes during human cell division. Conway and colleagues report the findings today in Nature Communications.
The mitotic spindle must build a coherent bipolar structure from filaments that do not necessarily span the distance between a spindle pole and a chromosome. By mapping microtubule orientation and local arrangement, the researchers investigated how these pieces interact.
They observed characteristic wall-to-wall spacing of approximately eight nanometers, with spacing varying inversely with local microtubule density. The pattern is consistent with density-dependent steric interactions contributing to local organization.
The molecular motor Eg5 established local antiparallel overlaps independently of overall spindle bipolarity. A balance between Eg5 and dynein activity helped regulate microtubule density and maintain spindle architecture.
The study connects nanoscale structure with principles of cellular self-organization. Cryogenic imaging here is a method for examining cellular architecture; the work does not demonstrate viable tissue recovery after freezing or a clinical treatment.
Source: Conway et al., Nature Communications. Published October 29, 2026. DOI: 10.1038/s41467-026-78938-3.