Chromosome segregation

Using single-cell DNA sequencing after an error-prone mitosis in untransformed, diploid cell lines and organoids, chromosomes are shown to have different segregation error frequencies that result in non-random aneuploidy landscapes.

Yeonmi Lee, Aysha Trout, Nuria Marti-Guiterrez et al. examine different aspects of somatic cell haploidization in mouse enucleated oocytes. Their results provide further insight into generating oocytes carrying somatic genomes.

The authors used novel single-molecule technology to measure the affinity of interactions between the ubiquitin ligase APC/C and its substrates, providing insights into the control of APC/C substrate destruction during mitosis.

Mitotic spindle assembly is required for proper cell division, but many underlying mechanisms remain unclear. Here, the authors show that NuMa undergoes liquid-liquid phase separation, condensing on spindle poles during mitotic entry and enriching critical components to promote spindle assembly.

Chromosome instability frequently occurs due to issues with chromosome-microtubule attachments. Here the authors show that the Astrin-PP1 and Cyclin-B-CDK1 pathways counteract each other to protect chromosome-microtubule attachments independent of biorientation.

PKCε is known to exert a role in genome protection by directly phosphorylating and switching the specificity of Aurora B. Here the authors identify SERBP1 as a parallel mitotic PKCε substrate controlling translation and ensuring the integrity of chromosome segregation and successful cell division.