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Chromosomal abnormalities in embryos.

M C Magli1, L Gianaroli, A P Ferraretti

  • 1SISMER, Reproductive Medicine Unit, Via Mazzini 12, 40138, Bologna, Italy.

Molecular and Cellular Endocrinology
|September 29, 2001
PubMed
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In vitro fertilization (IVF) patients with poor pregnancy prognosis show high rates of chromosomal abnormalities in embryos. Relying solely on embryo appearance is insufficient for selecting the best embryos for transfer.

Area of Science:

  • Reproductive medicine
  • Embryology
  • Genetics

Background:

  • Assisted reproductive technologies (ART) aim to improve pregnancy outcomes.
  • Embryo morphology is a key factor in embryo selection during IVF.
  • Patients with poor prognosis often have lower success rates.

Purpose of the Study:

  • To investigate the chromosomal status of embryos from patients with poor prognosis.
  • To determine the correlation between embryo morphology and chromosomal abnormalities.
  • To assess the predictive value of morphological criteria for embryo selection in this patient group.

Main Methods:

  • Chromosomal analysis (e.g., array comparative genomic hybridization or next-generation sequencing) was performed on 1620 in vitro fertilized embryos.
  • Embryos were from patients identified as having a poor prognosis for pregnancy.

Related Experiment Videos

  • Morphological parameters including cellular stage, fragmentation, and multinucleation were evaluated.

    • Main Results:

    • A high rate of chromosomal abnormalities (66%) was observed in the analyzed embryos.
    • Significant associations were found between chromosomal abnormalities and cellular stage, fragmentation, and multinucleation.
    • Embryos with multinucleated cells were frequently diagnosed as mosaic (92%).
    • Development to expanded blastocyst stage was influenced by biopsy timing and chromosomal status.
    • Euploid embryos showed a higher rate of blastocyst development (68%) compared to abnormal embryos (43%).

    Conclusions:

    • Morphological assessment alone is inadequate for optimal embryo selection in poor prognosis IVF patients.
    • Chromosomal analysis is crucial for accurate embryo assessment in this population.
    • Understanding the relationship between morphology and aneuploidy can guide embryo transfer decisions.