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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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Oogenesis,  the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
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Update on oogenesis in vitro.

Raffaella Fabbri1, Chiara Zamboni2, Rossella Vicenti1

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In vitro oogenesis shows promise for fertility preservation, with advancements in ovarian tissue culture systems. However, achieving developmentally competent oocytes in higher mammals remains a challenge.

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Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Cell Culture

Background:

  • Ovarian tissue cryopreservation is crucial for fertility preservation in cancer patients.
  • In vitro oogenesis offers an alternative to autologous transplantation for restoring fertility.

Purpose of the Study:

  • To review recent data on in vitro oogenesis.
  • To provide an update on current knowledge of in vitro follicle growth and development.

Main Methods:

  • Systematic MEDLINE search conducted from February 2018.
  • Keywords included "ovary," "follicle," "in vitro growth," "ovarian tissue culture," "fertility preservation," "IVM," and "oocyte."
  • Preference given to recent reviews and original articles.

Main Results:

  • Ovarian tissue culture systems aim to optimize primordial follicle activation, preantral follicle culture, and oocyte maturation.
  • Successful in vitro oocyte development and live offspring production achieved in mice.
  • Developmentally competent oocytes for higher mammals remain a challenge despite extensive research.

Conclusions:

  • Significant improvements have been made in ovarian tissue culture techniques.
  • Future advancements aim to provide patients with more developmentally competent oocytes for fertility preservation.