Assessment of mouse germinal vesicle stage oocyte quality by evaluating the cumulus layer, zona pellucida, and perivitelline space

PLoS One. 2014 Aug 21;9(8):e105812. doi: 10.1371/journal.pone.0105812. eCollection 2014.

Abstract

To improve the outcome of assisted reproductive technology (ART) for patients with ovulation problems, it is necessary to retrieve and select germinal vesicle (GV) stage oocytes with high developmental potential. Oocytes with high developmental potential are characterized by their ability to undergo proper maturation, fertilization, and embryo development. In this study, we analyzed morphological traits of GV stage mouse oocytes, including cumulus cell layer thickness, zona pellucida thickness, and perivitelline space width. Then, we assessed the corresponding developmental potential of each of these oocytes and found that it varies across the range measured for each morphological trait. Furthermore, by manipulating these morphological traits in vitro, we were able to determine the influence of morphological variation on oocyte developmental potential. Manually altering the thickness of the cumulus layer showed strong effects on the fertilization and embryo development potentials of oocytes, whereas manipulation of zona pellucida thickness effected the oocyte maturation potential. Our results provide a systematic detailed method for selecting GV stage oocytes based on a morphological assessment approach that would benefit for several downstream ART applications.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cumulus Cells / cytology*
  • Cumulus Cells / metabolism
  • Female
  • Mice
  • Oocytes / cytology*
  • Oocytes / metabolism
  • Zona Pellucida*

Grants and funding

This research was supported by: Open Major Basic Research Projects in Inner Mongolia (20102008) to CL, http://nsbr.nmkjt.gov.cn/index.aspx; The National Natural Science Foundation of China (31160243, 31371454) to CL, http://www.nsfc.gov.cn/; Program for New Century Excellent Talents in University (NCET-11-1014) to CL, http://www.moe.edu.cn/; Program of Higher Level Talents of Inner Mongolia University (Z20100125) to CL, http://www.imu.edu.cn/; Inner Mongolia Natural Science Foundation (20120516) to YM, http://nsbr.nmkjt.gov.cn/index.aspx. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.