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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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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...
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Fertility Preservation in Patients with Severe Ovarian Dysfunction
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Iodine and fertility: do we know enough?

Divya M Mathews1, Neil P Johnson2, Robert G Sim3

  • 1Liggins Institute, University of Auckland, Auckland, New Zealand.

Human Reproduction (Oxford, England)
|December 8, 2020
PubMed
Summary
This summary is machine-generated.

Iodine, essential for thyroid function, also impacts fertility. High iodine levels may improve conception rates in unexplained infertility (UI), suggesting a role beyond thyroid health.

Keywords:
endometriosisfertilityiodinelipiodoloil-soluble contrastunexplained infertility

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Area of Science:

  • Endocrinology
  • Reproductive Biology
  • Nutritional Science

Background:

  • Iodine is a crucial micronutrient primarily known for its role in thyroid hormone synthesis.
  • Beyond thyroid function, iodine is actively absorbed by reproductive tissues like the ovary and endometrium.
  • Iodine deficiency is linked to impaired fertility, while recent studies suggest high iodine concentrations may enhance conception rates in unexplained infertility (UI).

Purpose of the Study:

  • To explore the metabolism of iodine and its multifaceted role in fertility.
  • To discuss the implications of both iodine deficiency and excess on reproductive health.
  • To review animal study findings on iodine's impact on the uterine and ovarian environment, hormonal balance, and implantation.

Main Methods:

  • Literature review and synthesis of existing research on iodine metabolism and reproductive function.
  • Analysis of studies investigating the effects of iodine on fertility, including outcomes from high-iodine contrast media use.
  • Examination of animal models to understand iodine's influence on reproductive physiology and immunology.

Main Results:

  • Iodine is concentrated in ovarian and endometrial tissues, indicating a direct role in reproductive processes.
  • Evidence suggests a correlation between iodine deficiency and reduced fertility.
  • High-concentration iodine contrast media have shown promise in improving conception rates for couples with UI.

Conclusions:

  • Iodine's influence extends beyond the thyroid, playing a significant role in female reproductive health.
  • Iodine excess, independent of thyroid function, may contribute to improved fertility outcomes.
  • Iodine warrants further investigation as a potential therapeutic agent for unexplained infertility (UI).