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Preimplantation Genetic Testing for Aneuploidy: Current Perspectives.

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Preimplantation genetic testing for aneuploidies (PGT-A) may improve live birth rates in assisted reproduction. Newer methods show promise, addressing concerns about invasive biopsy and cost for better outcomes.

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Area of Science:

  • Reproductive Medicine
  • Genetics
  • Embryology

Background:

  • Assisted reproduction techniques (ARTs) have suboptimal live birth rates, especially in advanced maternal age (AMA) women.
  • Embryonic aneuploidy is a key factor in poor reproductive outcomes for AMA, recurrent miscarriage, and implantation failure.
  • Preimplantation genetic testing for aneuploidies (PGT-A) aims to improve ART success by selecting euploid embryos.

Purpose of the Study:

  • To review the current evidence supporting PGT-A.
  • To address concerns associated with PGT-A, including biopsy risks and costs.
  • To explore the future advancements in PGT-A technology.

Main Methods:

  • Review of existing studies on PGT-A efficacy.
  • Analysis of data from early PGT-A trials versus newer comprehensive chromosome screening (CCS) studies.
  • Evaluation of emerging noninvasive techniques and high-throughput methods.

Main Results:

  • Early PGT-A studies using FISH showed no improvement and potential harm.
  • Modern PGT-A with CCS demonstrates higher implantation, pregnancy, and live birth rates.
  • Advancements in biopsy, culture, and vitrification have enhanced PGT-A effectiveness.

Conclusions:

  • PGT-A, particularly with CCS, shows increasing evidence of improving ART outcomes.
  • Ongoing developments in noninvasive methods and cost reduction are addressing PGT-A limitations.
  • PGT-A represents a promising technology for enhancing fertility treatments.