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Related Concept Videos

Oogenesis02:07

Oogenesis

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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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Nondisjunction01:21

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Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold...
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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...
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Updated: Jan 19, 2026

Cell-Specific Paired Interrogation of the Mouse Ovarian Epigenome and Transcriptome
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Epigenetics and Female Reproductive Aging.

Isaac J Chamani1, David L Keefe2

  • 1NYU School of Medicine, New York, NY, United States.

Frontiers in Endocrinology
|September 26, 2019
PubMed
Summary
This summary is machine-generated.

As women delay childbearing, understanding reproductive aging is crucial. This review explores age-related epigenetic changes in female reproductive organs and their impact on fertility outcomes.

Keywords:
DNAagingepigeneticsinfertilityreproductive

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Area of Science:

  • Reproductive Biology
  • Epigenetics
  • Aging Research

Background:

  • Increasing maternal age is a significant trend in human reproduction.
  • Aging impacts female reproductive organs and fertility.
  • The biological mechanisms underlying reproductive aging require further investigation.

Purpose of the Study:

  • To review recent findings on age-related epigenetic alterations in female reproductive organs.
  • To explore the potential contribution of these epigenetic changes to reproductive outcomes.

Main Methods:

  • Literature review of recent studies on reproductive aging and epigenetics.
  • Analysis of epigenetic modifications (e.g., DNA methylation, histone modifications) in female reproductive tissues.
  • Correlation of epigenetic changes with fertility parameters.

Main Results:

  • Epigenetic modifications accumulate in female reproductive organs with advanced maternal age.
  • These age-related epigenetic changes are associated with altered gene expression patterns.
  • Evidence suggests a link between epigenetic dysregulation and diminished ovarian reserve and oocyte quality.

Conclusions:

  • Age-related epigenetic changes are a key factor in female reproductive aging.
  • Targeting epigenetic mechanisms may offer future strategies to improve reproductive outcomes in older women.
  • Further research is needed to fully elucidate the role of epigenetics in fertility decline.