» Articles » PMID: 35320416

MDC1 is Essential for G2/M Transition and Spindle Assembly in Mouse Oocytes

Overview
Publisher Springer
Specialty Biology
Date 2022 Mar 23
PMID 35320416
Authors
Affiliations
Soon will be listed here.
Abstract

Mammalian oocytes are particularly susceptible to accumulating DNA damage. However, unlike mitotic cells in which DNA damage induces G2 arrest by activating the ATM-Chk1/2-Cdc25 pathway, oocytes readily enter M-phase immediately following DNA damage. This implies a lack of a robust canonical G2/M DNA damage checkpoint in oocytes. Here we show that MDC1 plays a non-canonical role in controlling G2/M transition by regulating APC/C-Cdh1-mediated cyclin B1 degradation in response to DNA damage in mouse oocytes. Depletion of MDC1 impaired M-phase entry by decreasing cyclin B1 levels via the APC/C-Cdh1 pathway. Notably, the APC/C-Cdh1 regulation mediated by MDC1 was achieved by a direct interaction between MDC1 and APC/C-Cdh1. This interaction was transiently disrupted after DNA damage with a concomitant increase in Cdh1 levels, which, in turn, decreased cyclin B1 levels and delayed M-phase entry. Moreover, MDC1 depletion impaired spindle assembly by decreasing the integrity of microtubule organizing centers (MTOCs). Therefore, our results demonstrate that MDC1 is an essential molecule in regulating G2/M transition in response to DNA damage and in regulating spindle assembly in mouse oocytes. These results provide new insights into the regulation of the G2/M DNA damage checkpoint and cell cycle control in oocytes.

Citing Articles

Distinct characteristics of the DNA damage response in mammalian oocytes.

Leem J, Lee C, Choi D, Oh J Exp Mol Med. 2024; 56(2):319-328.

PMID: 38355825 PMC: 10907590. DOI: 10.1038/s12276-024-01178-2.


Oocytes can repair DNA damage during meiosis via a microtubule-dependent recruitment of CIP2A-MDC1-TOPBP1 complex from spindle pole to chromosomes.

Leem J, Kim J, Oh J Nucleic Acids Res. 2023; 51(10):4899-4913.

PMID: 36999590 PMC: 10250218. DOI: 10.1093/nar/gkad213.


Selective utilization of non-homologous end-joining and homologous recombination for DNA repair during meiotic maturation in mouse oocytes.

Lee C, Leem J, Oh J Cell Prolif. 2022; 56(4):e13384.

PMID: 36564861 PMC: 10068936. DOI: 10.1111/cpr.13384.

References
1.
Krenning L, Feringa F, Shaltiel I, van den Berg J, Medema R . Transient activation of p53 in G2 phase is sufficient to induce senescence. Mol Cell. 2014; 55(1):59-72. DOI: 10.1016/j.molcel.2014.05.007. View

2.
Marangos P, Stevense M, Niaka K, Lagoudaki M, Nabti I, Jessberger R . DNA damage-induced metaphase I arrest is mediated by the spindle assembly checkpoint and maternal age. Nat Commun. 2015; 6:8706. PMC: 4667640. DOI: 10.1038/ncomms9706. View

3.
Li Z, Shao C, Kong Y, Carlock C, Ahmad N, Liu X . DNA Damage Response-Independent Role for MDC1 in Maintaining Genomic Stability. Mol Cell Biol. 2017; 37(9). PMC: 5394279. DOI: 10.1128/MCB.00595-16. View

4.
Schuh M, Ellenberg J . Self-organization of MTOCs replaces centrosome function during acentrosomal spindle assembly in live mouse oocytes. Cell. 2007; 130(3):484-98. DOI: 10.1016/j.cell.2007.06.025. View

5.
Blackford A, Jackson S . ATM, ATR, and DNA-PK: The Trinity at the Heart of the DNA Damage Response. Mol Cell. 2017; 66(6):801-817. DOI: 10.1016/j.molcel.2017.05.015. View