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Methodology for Accurate Detection of Mitochondrial DNA Methylation
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Comprehensive mitochondrial DNA analysis and IVF outcome.

B Lledo1, J A Ortiz1, R Morales1

  • 1Instituto Bernabeu Biotech, 03016 Alicante, Spain.

Human Reproduction Open
|March 22, 2019
PubMed
Summary
This summary is machine-generated.

Elevated mitochondrial DNA (mtDNA) copy number in human embryos is linked to a reduced ongoing pregnancy rate. This finding suggests mtDNA copy number is a potential biomarker for IVF success.

Keywords:
PGT-Aheteroplasmyimplantation ratemtDNAongoing pregnancy

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Area of Science:

  • Reproductive biology
  • Mitochondrial genetics
  • Embryology

Background:

  • Mitochondria are crucial for cellular function, and mitochondrial DNA (mtDNA) is increasingly studied as a biomarker for embryo implantation.
  • Previous research on mtDNA levels in blastocysts yielded conflicting results regarding implantation potential.
  • Both mtDNA heteroplasmy and copy number are thought to influence mitochondrial function, necessitating advanced analysis techniques.

Purpose of the Study:

  • To investigate the association between mitochondrial DNA (mtDNA) copy number and heteroplasmy in human embryos and their impact on ongoing pregnancy rates.
  • To explore the role of mtDNA as a potential biomarker in preimplantation genetic testing for aneuploidies (PGT-A).

Main Methods:

  • A prospective study analyzed 159 euploid blastocyst biopsies using next-generation sequencing (NGS) to determine mtDNA copy number and heteroplasmy.
  • Relative mtDNA copy number was calculated by normalizing mtDNA reads to nuclear DNA, with adjustments for technical and genomic factors.
  • MitoSeek software was used for heteroplasmy assignment, and statistical analyses were performed to correlate mtDNA parameters with IVF outcomes.

Main Results:

  • Elevated mtDNA copy number (above a threshold of 0.003) was associated with a significantly lower ongoing pregnancy rate (17.65% vs. 42.96%, P < 0.05).
  • Higher mtDNA copy number was observed in embryos from older women and those biopsied on Day 5.
  • While a trend for lower pregnancy rates was seen in embryos with more than two mtDNA variants, it did not reach statistical significance (P = 0.188).

Conclusions:

  • Embryos with elevated mtDNA copy number demonstrate a reduced likelihood of achieving an ongoing pregnancy.
  • mtDNA copy number is influenced by maternal age and the number of cell divisions prior to biopsy.
  • Further research and clinical trials are needed to validate mtDNA levels as a selection criterion for embryo transfer in IVF.