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Chromosomal abnormalities in oocytes.

M Plachot1

  • 1Laboratoire de Fécondation in vitro, CHI Jean Rostand, 141 Grande Rue, 92310, Sevres, France. mplachot@maildoc.com

Molecular and Cellular Endocrinology
|September 29, 2001
PubMed
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Chromosomal abnormalities in oocytes contribute to fertilization failure and impaired embryonic development. Various factors, including infertility status and environmental influences, can increase the risk of these oocyte abnormalities.

Area of Science:

  • Human Reproduction
  • Reproductive Genetics
  • Oocyte Biology

Background:

  • Basic research in human reproduction and genetics has illuminated the role of chromosomal abnormalities in oocyte disorders and embryonic development.
  • A significant percentage of oocytes failing to fertilize after in vitro insemination exhibit chromosomal abnormalities, including hypohaploidy, hyperhaploidy, structural abnormalities, and diploidy.
  • The incidence of these abnormalities appears linked to female fertility status, being higher in women with tubal or unexplained infertility.

Purpose of the Study:

  • To review the contribution of chromosomal abnormalities to oocyte disorders and impaired embryonic development.
  • To explore factors influencing oocyte aneuploidy, including maternal age and intra-/extra-follicular conditions.
  • To understand the sensitivity of oocyte meiosis to various endogenous and exogenous factors.

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Main Methods:

  • Review of existing literature on oocyte chromosomal abnormalities and in vitro fertilization (IVF).
  • Analysis of data on the incidence of various chromosomal abnormalities in non-fertilizing oocytes.
  • Examination of correlations between oocyte abnormalities and female fertility status, gonadotropin use, maternal age, and environmental factors.

Main Results:

  • 26.5% of oocytes failing to fertilize after in vitro insemination were abnormal, with specific percentages for hypohaploidy (13.3%), hyperhaploidy (8.1%), structural abnormalities (1.6%), and diploidy (3.5%).
  • Oocyte abnormality rates were higher in women with tubal or unexplained infertility compared to those with male-factor infertility.
  • Gonadotropins did not appear to increase the risk of abnormalities, and maternal age's effect on aneuploidy was not definitively linked to increased aneuploid oocytes.

Conclusions:

  • Oocyte meiosis is highly susceptible to both endogenous and exogenous factors, which can lead to chromosomal abnormalities.
  • Factors such as intra- and extra-follicular influences (e.g., microvasculature, oxygenation, cigarette smoke) can disrupt oocyte maturation, resulting in immaturity and aneuploidy.
  • Chromosomal abnormalities in oocytes are a significant cause of failed fertilization and abnormal zygote formation, impacting reproductive outcomes.