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Spontaneous and artificial changes in human ooplasmic mitochondria.

J A Barritt1, C A Brenner, S Willadsen

  • 1Gamete and Embryo Research Laboratory, The Institute for Reproductive Medicine and Science of Saint Barnabas, West Orange, New Jersey 07052, USA.

Human Reproduction (Oxford, England)
|October 21, 2000
PubMed
Summary
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Mitochondrial DNA mutations in oocytes and embryos can impair development. Ooplasmic transfer introduced normal mitochondria, leading to healthy births in women with implantation failure, demonstrating sustained mitochondrial heteroplasmy.

Area of Science:

  • Reproductive Biology
  • Mitochondrial Genetics

Background:

  • Mitochondrial DNA (mtDNA) mutations in oocytes may cause embryo development issues.
  • Mitochondrial heteroplasmy, the mix of mtDNA populations, is debated in ooplasmic transfer.

Purpose of the Study:

  • Investigate oocyte mtDNA mutations and their impact on mitochondrial inheritance and functionality.
  • Evaluate the efficacy of ooplasmic transplantation in improving embryo development and pregnancy outcomes.

Main Methods:

  • Nested polymerase chain reaction (PCR) to detect mtDNA deletions and rearrangements in human oocytes and embryos.
  • Ooplasmic transfer procedure in women with recurrent implantation failure.
  • mtDNA fingerprinting to track donor and recipient mitochondrial DNA inheritance.

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Main Results:

  • Common mtDNA deletion (deltamtDNA4977) found in 33% of oocytes and 8% of embryos.
  • 23 novel mtDNA rearrangements detected; 51% of oocytes and 32% of embryos showed rearrangements.
  • Ooplasmic transfer resulted in eight healthy births from 23 attempts, with evidence of donor mtDNA in offspring tissues.

Conclusions:

  • Significant mtDNA rearrangements occur in human oocytes and embryos, suggesting a selection process during early development.
  • Ooplasmic transfer is a viable strategy for improving outcomes in patients with implantation failure.
  • Sustained heteroplasmy, with both donor and recipient mtDNA present, can be achieved through ooplasmic transfer.