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Related Experiment Videos

Electrical activation of mouse oocytes.

P Collas1, J J Balise, G A Hofmann

  • 1Department of Veterinary and Animal Sciences University of Massachusetts Amherst, Massachusetts 01003 USA.

Theriogenology
|November 1, 1989
PubMed
Summary

Multiple electrical pulses significantly increase mouse oocyte activation rates for nuclear transplantation. Aged oocytes show higher activation but also increased lysis and fragmentation compared to younger ones.

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Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Cellular Biology

Background:

  • Oocyte activation is a critical and often inefficient step in nuclear transplantation.
  • Optimizing oocyte activation is essential for improving the efficiency of reproductive technologies.

Purpose of the Study:

  • To investigate the impact of various electrical pulse parameters on mouse oocyte activation rates.
  • To determine the influence of oocyte age and electrical field characteristics on activation efficiency.

Main Methods:

  • Electrical pulses were applied to mouse oocytes with varying field strengths, pulse durations, numbers, and intervals.
  • Different electrode configurations and field geometries (uniform vs. nonuniform) were tested.
  • Oocyte activation, lysis, and fragmentation rates were quantified.

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Main Results:

  • Oocyte activation rates were largely independent of field strength and pulse duration across a wide range.
  • Aged oocytes exhibited higher activation rates (32%) but also increased lysis (13%) and fragmentation (42%) compared to recently ovulated oocytes (3% activation, 2% lysis, 6% fragmentation).
  • Activation rates increased significantly with the number of pulses (9% for one pulse to 61% for six pulses) and pulse interval.
  • Nonuniform electrical fields and specific electrode configurations resulted in higher activation rates.

Conclusions:

  • Multiple electrical pulses are highly effective in enhancing mouse oocyte activation for nuclear transplantation.
  • Oocyte age influences activation efficiency and viability, with aged oocytes being more prone to damage.
  • Optimizing electrical pulse parameters and chamber geometry can significantly improve success rates in oocyte activation procedures.