Related Experiment Video
Updated: Feb 14, 2026
Author Spotlight: Understanding DNA Damage Response in Mammalian Oocytes and Preimplantation Embryos
Published on: June 23, 2023
Oocyte DNA damage quality control requires consecutive interplay of CHK2 and CK1 to activate p63
Marcel Tuppi1, Sebastian Kehrloesser1, Daniel W Coutandin1
1Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance and Cluster of Excellence Macromolecular Complexes (CEF), Goethe University, Frankfurt, Germany.
Abstract:
The survival rate of cancer patients is steadily increasing, owing to more efficient therapies. Understanding the molecular mechanisms of chemotherapy-induced premature ovarian insufficiency (POI) could identify targets for prevention of POI. Loss of the primordial follicle reserve is the most important cause of POI, with the p53 family member p63 being responsible for DNA-damage-induced apoptosis of resting oocytes. Here, we provide the first detailed mechanistic insight into the activation of p63, a process that requires phosphorylation by both the priming kinase CHK2 and the executioner kinase CK1 in mouse primordial follicles. We further describe the structural changes induced by phosphorylation that enable p63 to adopt its active tetrameric conformation and demonstrate that previously discussed phosphorylation by c-Abl is not involved in this process. Inhibition of CK1 rescues primary oocytes from doxorubicin and cisplatin-induced apoptosis, thus uncovering a new target for the development of fertoprotective therapies.
Insights
Chemotherapy can cause premature ovarian insufficiency (POI) by triggering oocyte apoptosis via p63 activation. Inhibiting CK1 kinase protects oocytes, offering a new target for fertility preservation during cancer treatment.
Area of Science:
- Reproductive biology
- Molecular oncology
- Cellular signaling
Background:
- Cancer survival rates are improving due to advanced therapies.
- Chemotherapy can lead to premature ovarian insufficiency (POI), impacting fertility.
- p63, a p53 family member, mediates DNA-damage-induced apoptosis in oocytes, contributing to POI.
Purpose of the Study:
- To elucidate the molecular mechanisms of p63 activation in chemotherapy-induced POI.
- To identify potential targets for preventing POI in cancer patients.
Main Methods:
- Investigated the phosphorylation and activation of p63 in mouse primordial follicles.
- Utilized structural analysis to understand p63 conformational changes.
- Examined the role of CHK2, CK1, and c-Abl kinases in p63 activation.
- Assessed the effect of CK1 inhibition on oocyte survival following doxorubicin and cisplatin treatment.
Main Results:
- p63 activation in primordial follicles requires phosphorylation by CHK2 and CK1.
- Phosphorylation induces structural changes enabling p63 tetramer formation.
- c-Abl is not involved in p63 activation.
- CK1 inhibition protected primary oocytes from chemotherapy-induced apoptosis.
Conclusions:
- CK1 is a key mediator of chemotherapy-induced oocyte apoptosis through p63.
- Targeting CK1 presents a novel strategy for developing fertoprotective therapies against POI.
Related Concept Videos
01:05Quality Control
Quality control helps track data, visualize trends, and identify variations, making it easier to detect deviations that may affect the accuracy of an analysis. One way to do this is by generating a quality control chart, which...
01:16Cycloaddition Reactions: MO Requirements for Thermal Activation
01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
02:36DNA Damage Can Stall the Cell Cycle
02:36DNA Damage can Stall the Cell Cycle
01:26Requirements for Human Life
Oxygen
Atmospheric air is only about 20 percent oxygen, but that oxygen is a key component of the chemical reactions that keep the body alive, including the reactions that produce ATP. Brain cells are susceptible to a lack of oxygen because they require a...