Distinct Aurora B Pools at the Inner Centromere and Kinetochore Have Different Contributions to Meiotic and Mitotic Chromosome Segregation
Overview
Affiliations
Proper chromosome segregation depends on the establishment of bioriented kinetochore-microtubule attachments, which often requires multiple rounds of release and reattachment. Aurora B and C kinases phosphorylate kinetochore proteins to release tensionless attachments. Multiple pathways recruit Aurora B/C to the centromere and kinetochore. We studied how these pathways contribute to anaphase onset timing and correction of kinetochore-microtubule attachments in budding yeast meiosis and mitosis. We find that the pool localized by the Bub1/Bub3 pathway sets the normal duration of meiosis and mitosis, in differing ways. Our meiosis data suggests a model that disruption of this pathway leads to PP1 kinetochore localization, which dephosphorylates Cdc20 for premature anaphase onset. For error correction, the Bub1/Bub3 and COMA pathways are individually important in meiosis but compensatory in mitosis. Finally, we find that the haspin and Bub1/3 pathways function together to ensure error correction in mouse oogenesis. Our results suggest that each recruitment pathway localizes spatially distinct kinetochore-localized Aurora B/C pools that function differently between meiosis and mitosis.
Aneuploidy of specific chromosomes is beneficial to cells lacking spindle checkpoint protein Bub3.
Gadgil P, Ballew O, Sullivan T, Lacefield S PLoS Genet. 2025; 21(2):e1011576.
PMID: 39903784 PMC: 11819610. DOI: 10.1371/journal.pgen.1011576.
Histone H3 tail modifications required for meiosis in .
Prichard A, Johansson M, Kirkpatrick D, Clarke D bioRxiv. 2024; .
PMID: 39713340 PMC: 11661218. DOI: 10.1101/2024.12.09.627563.
Kouznetsova A, Valentiniene S, Liu J, Kitajima T, Brismar H, Hoog C Front Cell Dev Biol. 2024; 12:1470981.
PMID: 39355122 PMC: 11442388. DOI: 10.3389/fcell.2024.1470981.
Low tension recruits the yeast Aurora B protein Ipl1 to centromeres in metaphase.
Edgerton H, Mukherjee S, Johansson M, Bachant J, Gardner M, Clarke D J Cell Sci. 2023; 136(16).
PMID: 37519149 PMC: 10445749. DOI: 10.1242/jcs.261416.