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Published in: Reproductive Biology and Endocrinology 1/2017

Open Access 01-12-2017 | Research

Plk1 is essential for proper chromosome segregation during meiosis I/meiosis II transition in pig oocytes

Authors: Zixiao Zhang, Changchao Chen, Liying Ma, Qiuchen Yu, Shuai Li, Benazir Abbasi, Jiayi Yang, Rong Rui, Shiqiang Ju

Published in: Reproductive Biology and Endocrinology | Issue 1/2017

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Abstract

Background

Polo-like kinase 1 (Plk1), as a characteristic regulator in meiosis, organizes multiple biological events of cell division. Although Plk1 has been implicated in various functions in somatic cell mitotic processes, considerably less is known regarding its function during the transition from metaphase I (MI) to metaphase II (MII) stage in oocyte meiotic progression.

Methods

In this study, the possible role of Plk1 during the MI-to-MII stage transition in pig oocytes was addressed. Initially, the spatiotemporal expression and subcellular localization pattern of Plk1 were revealed in pig oocytes from MI to MII stage using indirect immunofluorescence and confocal microscopy imaging techniques combined with western blot analyses. Moreover, a highly selective Plk1 inhibitor, GSK461364, was used to determine the potential role of Plk1 during this MI-to-MII transition progression.

Results

Upon expression, Plk1 exhibited a specific dynamic intracellular localization, and co-localization of Plk1 with α-tubulin was revealed in the meiotic spindle of pig oocyte during the transition from MI to MII stage. GSK461364 treatment significantly blocked the first polar body (pbI) emission in a dose-dependent manner and resulted in a failure of meiotic maturation, with a larger percentage of the GSK461364-treated oocytes arresting in the anaphase-telophase I (ATI) stage. Further subcellular structure examination results showed that inhibition of Plk1 with GSK461364 had no visible effect on spindle assembly but caused a significantly higher proportion of the treated oocytes to have obvious defects in homologous chromosome segregation at ATI stage.

Conclusions

Thus, these results indicate that Plk1 plays an essential role during the meiosis I/meiosis II transition in porcine oocytes, and the regulation is associated with Plk1’s effects on homologous chromosome segregation in the ATI stage.
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Metadata
Title
Plk1 is essential for proper chromosome segregation during meiosis I/meiosis II transition in pig oocytes
Authors
Zixiao Zhang
Changchao Chen
Liying Ma
Qiuchen Yu
Shuai Li
Benazir Abbasi
Jiayi Yang
Rong Rui
Shiqiang Ju
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Reproductive Biology and Endocrinology / Issue 1/2017
Electronic ISSN: 1477-7827
DOI
https://doi.org/10.1186/s12958-017-0289-7

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