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Updated: May 11, 2026

11:13
Using Mouse Oocytes to Assess Human Gene Function During Meiosis I
Published on: April 10, 2018
Ovulation induction and epigenetic anomalies.
1Laboratoire de Biologie de la Reproduction, Hôpital de Dijon, Université de Bourgogne, Dijon, France. patricia.fauque@chu-dijon.fr
Fertility and Sterility
|May 30, 2013
Summary
Hormone treatments for ovulation induction may negatively impact the epigenetic reprogramming of eggs and embryos. Assisted reproduction protocols might also alter the uterine environment, potentially causing endometrial epigenetic disturbances.
Area of Science:
- Reproductive biology
- Epigenetics
- Developmental biology
Background:
- Ovulation induction and assisted reproduction technologies (ART) are widely used for infertility treatment.
- Epigenetic reprogramming is crucial for normal gamete and embryo development.
- Hormonal interventions in fertility treatments raise concerns about potential epigenetic alterations.
Purpose of the Study:
- To systematically review the impact of ovulation induction and ART on epigenetic control.
- To assess potential epigenetic risks associated with hormonal treatments in gametes, embryos, and the uterine environment.
Main Methods:
- Systematic review of existing literature, with a primary focus on studies utilizing mouse models.
- Analysis of data pertaining to epigenetic reprogramming in gametes and early embryos.
- Evaluation of potential links between ART hormone protocols and endometrial epigenetic changes.
Main Results:
- Studies, predominantly in mice, suggest hormone treatments can adversely affect epigenetic reprogramming in gametes and early embryos.
- ART hormone protocols may alter the uterine physiological environment, potentially leading to endometrial epigenetic disturbances.
- Current human data are insufficient to isolate the effects of age, infertility, treatment protocols, and hormone doses on genomic imprinting.
Conclusions:
- Hormonal treatments used in fertility therapies may pose risks to the epigenetic integrity of reproductive cells and early development.
- Further research, particularly in humans, is needed to fully understand and mitigate these potential epigenetic risks.
- The complex interplay of factors including patient age, infertility type, and specific treatment parameters requires detailed investigation.
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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 sister...
Nondisjunction
During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
Epigenetic Regulation
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...
X-chromosome...
Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.

