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Related Experiment Videos

Chromosome abnormalities in 1255 cleavage-stage human embryos.

C Márquez1, M Sandalinas, M Bahçe

  • 1Institute for Reproductive Medicine and Science, Saint Barnabas Medical Center, Livingston, New Jersey, USA.

Reproductive Biomedicine Online
|June 14, 2003
PubMed
Summary

Maternal age and embryo quality significantly impact chromosome abnormalities in human embryos. Older maternal age and poorer embryo development correlate with increased aneuploidy and polyploidy, affecting IVF success rates.

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Area of Science:

  • Reproductive biology
  • Human genetics
  • Embryology

Background:

  • Chromosome abnormalities are a major cause of implantation failure and miscarriage in IVF.
  • Understanding factors influencing embryonic chromosomal health is crucial for improving IVF outcomes.
  • Maternal age is a known risk factor for aneuploidy, but its precise impact on other chromosomal abnormalities needs further elucidation.

Purpose of the Study:

  • To investigate the relationship between maternal age, embryo morphology, and development rate with chromosome abnormalities in human embryos.
  • To analyze the prevalence of polyploidy and aneuploidy in non-viable embryos.
  • To establish associations between cleavage stage anomalies and specific chromosomal aberrations.

Main Methods:

  • Analysis of 731 non-viable human embryos from IVF treatment.

Related Experiment Videos

  • Disaggregation of embryos and fluorescence in-situ hybridization (FISH) for chromosome analysis.
  • Examination of chromosomes X, Y, 13, 18, 21, and 16.

    • Main Results:

    • Chromosome abnormalities increased with decreasing embryo competence and increasing maternal age.
    • Aneuploidy rates rose from 3.1% in embryos from patients aged 20-34 to 17% in those aged 40+.
    • Polyploidy and mosaicism were more prevalent in dysmorphic and slowly developing embryos, while aneuploidy was higher in those with good morphology.

    Conclusions:

    • Clear associations exist between maternal age and aneuploidy, and between cleavage anomalies and mosaicism in non-viable embryos.
    • Arrested embryos were predominantly polyploid, suggesting developmental compromise.
    • Polyploidy in day 4 embryos indicates potential arrest in extended culture.