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Related Concept Videos

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Meiosis II

Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each containing...
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In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
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Updated: Jul 14, 2026

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives
08:46

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives

Published on: September 16, 2021

Theoretical considerations for oocyte cryopreservation by freezing.

Gregory M Fahy1

  • 121st Century Medicine, Inc., Rancho Cucamonga, California, USA. gfahy@21cm.com

Reproductive Biomedicine Online
|June 21, 2007
PubMed
Summary

Oocyte cryopreservation success is limited by empirical freezing methods. A more theoretically informed approach using optimal cryoprotectant concentrations and addition/removal techniques is needed for better oocyte survival rates.

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Area of Science:

  • Reproductive Biology
  • Cryobiology
  • Oocyte Cryopreservation

Background:

  • Current oocyte cryopreservation techniques largely rely on empirical methods, leading to suboptimal success rates.
  • A lack of adherence to fundamental cryobiological principles may underlie the limitations of existing protocols.

Purpose of the Study:

  • To critically evaluate current oocyte cryopreservation strategies based on theoretical cryobiology.
  • To identify key areas for improvement in oocyte freezing and thawing protocols.

Main Methods:

  • Theoretical analysis of cryoprotectant concentrations and osmosal stress during oocyte freezing.
  • Evaluation of the suitability of propylene glycol (PG) and non-permeating agents like sucrose.
  • Assessment of cryoprotectant addition and removal methods in relation to oocyte survival.

Main Results:

  • Past studies likely used inadequate concentrations of permeating cryoprotectants.
  • The choice of propylene glycol (PG) as a cryoprotectant may be suboptimal.
  • The use of non-permeating agents like sucrose, while potentially protective, may exacerbate osmotic stress.

Conclusions:

  • Existing empirical approaches to oocyte cryopreservation are insufficient.
  • A theoretically grounded strategy is essential for improving oocyte cryopreservation outcomes.
  • Optimizing cryoprotectant use and handling is crucial for enhanced oocyte survival.