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Related Experiment Videos

Quantification of human ooplasmic mitochondria.

J A Barritt1, M Kokot, J Cohen

  • 1Gamete and Embryo Research Laboratory, Institute for Reproductive Medicine and Science of Saint Barnabas, West Orange, New Jersey, USA. Jason.Barritt@Embryos.Net

Reproductive Biomedicine Online
|April 24, 2003
PubMed
Summary
This summary is machine-generated.

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Human oocytes contain approximately 795,000 copies of mitochondrial DNA (mtDNA). mtDNA copy number is established before the germinal vesicle stage and does not correlate with maternal age.

Area of Science:

  • Cell Biology
  • Reproductive Biology
  • Genetics

Background:

  • Mitochondria are crucial for cellular function, particularly in oocytes which support early development.
  • Oocytes have a high mitochondrial content, but replication is delayed until gastrulation.

Purpose of the Study:

  • To quantify mitochondrial DNA (mtDNA) copy number in human oocytes.
  • To investigate the relationship between mtDNA copy number, oocyte stage, and maternal age.

Main Methods:

  • DNA extraction from 87 human oocytes (29 patients).
  • Real-time quantitative polymerase chain reaction (PCR) to determine mtDNA copy number.

Main Results:

  • Average mtDNA copy number in metaphase II oocytes was 795,000 (+/- 243,000).

Related Experiment Videos

  • Significant variation in mtDNA content observed between oocytes, even within the same patient.
  • No correlation found between mtDNA copy number and maternal age.

    • Conclusions:

    • Mitochondrial DNA replication is completed by the germinal vesicle stage in mature oocytes.
    • mtDNA copy number is established early and does not appear to be influenced by maternal age in the studied oocytes.