使用D3-6胚胎培養液分析胚胎染色體(niPGT-A) vs 傳統囊胚切片PGT

niPGT-A  DNA amplification failure 機率仍然偏高 約37%

傳統囊胚切片PGT DNA amplification failure 機率為0%

Noninvasive preimplantation genetic testing for aneuploidy exhibits high rates of deoxyribonucleic acid amplification failure and poor correlation with results obtained using trophectoderm biopsy

Deoxyribonucleic acid amplification failures are high among noninvasive preimplantation genetic testing samples and correlate poorly with trophectoderm biopsies and clinical outcomes. The clinical utility of this testing modality remains low.

Fertility and Sterility Published Mar 19, 2021  VOLUME 115, ISSUE 6, P1461-1470

Objective

To validate a commercially available noninvasive preimplantation genetic testing for aneuploidy (niPGT-A) assay by investigating the following: prevalence of deoxyribonucleic acid (DNA) amplification failure with niPGT-A; factors affecting amplification failure with niPGT-A; and frequency of discordant results between niPGT-A and traditional preimplantation genetic testing for aneuploidy.

Patient(s)

One hundred sixty-six blastocysts and their surrounding culture media from couples undergoing in vitro fertilization between July 2019 and May 2020 were analyzed.

Intervention(s)

Blastocyst-stage spent culture media samples underwent niPGT-A using a commercially available kit that used whole-genome amplification with a modified multiple annealing and looping-based amplification cycle protocol followed by next-generation sequencing. Preimplantation genetic testing for aneuploidy of trophectoderm (TE) biopsies was performed using targeted next-generation sequencing.

Main Outcome Measure(s)

The primary outcome was failure to achieve an interpretable result with niPGT-A. Factors affecting DNA amplification were also assessed. Discrepancies between niPGT-A and TE biopsy results were analyzed, and clinical outcomes were evaluated.

Result(s)

Deoxyribonucleic acid amplification failures with niPGT-A were observed in 37.3% (62/166) of the samples. With TE biopsy, no embryos exhibited DNA amplification failure. Embryos with a shorter duration of exposure to the culture media and no evidence of whole-chromosome aneuploidy on the TE biopsy displayed high rates of DNA amplification failure with niPGT-A. Of 104 embryos with both niPGT-A and TE biopsy results available, whole-chromosome discordance was noted in 42 cases (40.4%). Three embryos classified as aneuploid based on the niPGT-A result progressed to successful delivery.

Conclusion(s)

The rates of DNA amplification failure were high among the niPGT-A samples, virtually precluding the clinical applicability of niPGT-A in its current form.