Cyclin A1 in Oocytes Prevents Chromosome Segregation And Anaphase Entry

0532026 - ÚŽFG 2021 RIV GB eng J - Journal Article
Radoňová, Lenka - Pauerová, Tereza - Jansová, Denisa - Danadová, J. - Škultéty, Michal - Kubelka, Michal - Anger, Martin
Cyclin A1 in Oocytes Prevents Chromosome Segregation And Anaphase Entry.
Scientific Reports. Roč. 10, č. 1 (2020), č. článku 7455. ISSN 2045-2322. E-ISSN 2045-2322
R&D Projects: GA ČR(CZ) GA19-24528S
Institutional support: RVO:67985904
Keywords : cyclins * meiosis
OECD category: Cell biology
Impact factor: 4.380, year: 2020
Method of publishing: Open access
https://www.nature.com/articles/s41598-020-64418-1

In several species, including Xenopus, mouse and human, two members of cyclin A family were identified. Cyclin A2, which is ubiquitously expressed in dividing cells and plays role in DNA replication, entry into mitosis and spindle assembly, and cyclin A1, whose function is less clear and which is expressed in spermatocytes, leukemia cells and in postmitotic multiciliated cells. Deletion of the gene showed that cyclin A1 is essential for male meiosis, but nonessential for female meiosis. Our results revealed, that the cyclin A1 is not only dispensable in oocytes, we show here that its expression is in fact undesirable in these cells. Our data demonstrate that the APC/C and proteasome in oocytes are unable to target sufficiently cyclin A1 before anaphase, which leads into anaphase arrest and direct inhibition of separase. The cyclin A1-induced cell cycle arrest is oocyte-specific and the presence of cyclin A1 in early embryos has no effect on cell cycle progression or chromosome division. Cyclin A1 is therefore not only an important cell cycle regulator with biased expression in germline, being essential for male and damaging for female meiosis, its persistent expression during anaphase in oocytes shows fundamental differences between APC/C function in oocytes and in early embryos.
Permanent Link: http://hdl.handle.net/11104/0310628