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Related Experiment Videos

Prepregnancy testing for single-gene disorders by polar body analysis.

Y Verlinsky1, S Rechitsky, O Verlinsky

  • 1Reproductive Genetics Institute, Chicago, IL 60657, USA.

Genetic Testing
|August 28, 1999
PubMed
Summary

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Preimplantation genetic testing using polar body analysis allows couples to screen for single-gene disorders before pregnancy. This method enables the selection of mutation-free oocytes, leading to healthy births and avoiding unwanted pregnancy terminations.

Area of Science:

  • Reproductive genetics
  • Preimplantation genetic diagnosis
  • Molecular biology

Background:

  • Current methods for preventing single-gene disorders rely on prenatal diagnosis, often resulting in pregnancy termination.
  • A significant limitation is the termination of 25% of wanted pregnancies when affected fetuses are detected.
  • There is a need for methods that allow for genetic screening before pregnancy is established.

Purpose of the Study:

  • To develop and evaluate a prepregnancy genetic testing method using polar body analysis.
  • To enable couples at risk of single-gene disorders to select unaffected embryos for in vitro fertilization (IVF).
  • To reduce the incidence of genetic disorders through preimplantation genetic screening.

Main Methods:

  • DNA analysis of the first and second polar bodies extruded during oocyte maturation and fertilization.

Related Experiment Videos

  • Sequential multiplex nested PCR analysis of polar bodies to detect specific gene mutations and linked polymorphic markers.
  • In vitro fertilization (IVF) procedures followed by polar body genetic testing for preselection of mutation-free oocytes.

    • Main Results:

    • 191 out of 399 tested oocytes were predicted to be mutation-free and preselected for IVF.
    • 20 pregnancies resulted from the transfer of unaffected embryos, leading to 19 healthy births.
    • Follow-up analysis confirmed the diagnosis in 97% of cases, demonstrating high reliability.

    Conclusions:

    • Prepregnancy genetic testing via polar body analysis is a reliable method for preventing single-gene disorders.
    • This technique offers a viable alternative to prenatal diagnosis, reducing the need for pregnancy termination.
    • The study successfully demonstrated the effectiveness of polar body analysis in selecting healthy embryos for conception.