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Related Experiment Videos

Pre-embryonic diagnosis for Sandhoff disease.

Anver Kuliev1, Svetlana Rechitsky, Katya Laziuk

  • 1Reproductive Genetics Institute, Chicago, IL, USA. anverkuliev@hotmail.com

Reproductive Biomedicine Online
|March 30, 2006
PubMed
Summary

Pre-embryonic genetic diagnosis allows for the identification of mutations in oocytes before embryo development, preventing the discard of embryos. This novel approach successfully enabled a couple to have an unaffected child, avoiding embryo disposal.

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Area of Science:

  • Reproductive Medicine
  • Human Genetics
  • Embryology

Background:

  • Preimplantation genetic diagnosis (PGD) traditionally involves discarding or further analyzing embryos identified as abnormal.
  • This practice poses ethical and religious challenges for some individuals and communities.
  • Alternative methods are needed to address the limitations of discarding embryos with potential genetic abnormalities.

Observation:

  • A novel pre-embryonic genetic diagnosis technique was applied to a couple seeking PGD for Sandhoff disease.
  • This method involved analyzing polar bodies to identify mutation-free oocytes before embryo development.
  • Mutant oocytes were cryopreserved at the pronuclear stage, while mutation-free oocytes were cultured for potential transfer.

Findings:

  • Out of 16 tested oocytes for the 16-kb hexosaminidase B gene deletion, eight were predicted as mutant and frozen.

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  • The remaining eight oocytes were confirmed mutation-free via blastomere biopsy after further culture.
  • Transfer of two embryos derived from mutation-free oocytes resulted in the birth of an unaffected child.

    • Implications:

    • Pre-embryonic genetic diagnosis offers a viable alternative to embryo discard in PGD.
    • This technique respects religious and ethical objections to embryo disposal.
    • It expands the application of genetic diagnosis in assisted reproductive technologies.