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Updated: Jan 20, 2026
Using Mouse Oocytes to Assess Human Gene Function During Meiosis I
Published on: April 10, 2018
Microtubule‑severing protein Katanin p60 ATPase‑containing subunit A‑like 1 is involved in pole‑based spindle
Lei-Lei Gao1, Fei Xu2, Zhen Jin3
1Department of Gynecology, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang 310014, P.R. China.
Abstract:
Microtubule‑severing proteins (MTSPs) are a group of microtubule‑associated proteins essential for multiple microtubule‑related processes, including mitosis and meiosis. Katanin p60 ATPase‑containing subunit A‑like 1 (p60 katanin‑like 1) is an MTSP that maintains the density of spindle microtubules at the poles in mitotic cells; however, to date, there have been no studies about its role in female meiosis. Using in vitro‑matured (IVM) oocytes as a model, it was first revealed that p60 katanin‑like 1 was predominant in the ovaries and oocytes, indicating its essential roles in oocyte meiosis. It was also revealed that p60 katanin‑like 1 was concentrated at the spindle poles and co‑localized and interacted with γ‑tubulin, indicating that it may be involved in pole organization. Next, specific siRNA was used to deplete p60 katanin‑like 1; the spindle organization was severely disrupted and characterized by an abnormal width:length ratio, multipolarity and extra aster microtubules out of the main spindles. Finally, it was determined that p60 katanin‑like 1 knockdown retarded oocyte meiosis, reduced fertilization, and caused abnormal mitochondrial distribution. Collectively, these results indicated that p60 katanin‑like 1 is essential for oocyte meiosis by ensuring the integrity of the spindle poles.
Insights
Katanin p60-like 1 is crucial for female meiosis, ensuring spindle pole integrity. Its depletion disrupts spindle organization, hinders oocyte maturation, and impairs fertilization.
Area of Science:
- Cell Biology
- Reproductive Biology
- Molecular Biology
Background:
- Microtubule-severing proteins (MTSPs) are vital for cell division processes like mitosis and meiosis.
- Katanin p60 ATPase-containing subunit A-like 1 (p60 katanin-like 1) is an MTSP known to regulate spindle microtubules in mitosis.
- Its specific role in female meiosis remained unstudied.
Purpose of the Study:
- To investigate the function of p60 katanin-like 1 in female oocyte meiosis.
- To determine the localization and interaction of p60 katanin-like 1 within oocytes.
- To elucidate the consequences of p60 katanin-like 1 depletion on meiotic processes.
Main Methods:
- Localization studies in in vitro-matured (IVM) oocytes.
- Co-immunoprecipitation to assess protein interactions with γ-tubulin.
- siRNA-mediated knockdown of p60 katanin-like 1.
- Analysis of spindle organization, meiotic progression, fertilization rates, and mitochondrial distribution.
Main Results:
- p60 katanin-like 1 is predominantly expressed in ovaries and oocytes, concentrating at spindle poles and interacting with γ-tubulin.
- Depletion of p60 katanin-like 1 led to severely disrupted spindle organization, including multipolarity and abnormal microtubule arrays.
- Knockdown resulted in retarded oocyte meiosis, reduced fertilization rates, and aberrant mitochondrial distribution.
Conclusions:
- p60 katanin-like 1 is essential for maintaining spindle pole integrity during female meiosis.
- This protein plays a critical role in ensuring proper spindle organization and successful oocyte maturation.
- Dysregulation of p60 katanin-like 1 negatively impacts key reproductive processes.
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