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. 2017 Apr;34(4):479-486.
doi: 10.1007/s10815-016-0868-0. Epub 2017 Jan 9.

The accumulation of vitrified oocytes is a strategy to increase the number of euploid available blastocysts for transfer after preimplantation genetic testing

Sandrine Chamayou  1 , Maria Sicali  2 , Carmelita Alecci  2 , Carmen Ragolia  2 , Annalisa Liprino  2 , Daniela Nibali  2 , Giorgia Storaci  2 , Antonietta Cardea  2 , Antonino Guglielmino  2
Affiliations

The accumulation of vitrified oocytes is a strategy to increase the number of euploid available blastocysts for transfer after preimplantation genetic testing

Sandrine Chamayou et al. J Assist Reprod Genet. 2017 Apr.

Abstract

Purpose: In a preimplantation genetic diagnosis for aneuploidy (PGD-A) program, the more embryos available for biopsy, consequently increases the chances of obtaining euploid embryos to transfer. The aim was to increase the number of viable euploid blastocysts in patients undergoing PGD-A using fresh oocytes together with previously accumulated vitrified oocytes.

Methods: Sixty-nine patients with normal ovarian reserve underwent PGD-A for repeated implantation failure or recurrent pregnancy loss indication. After several cycles of ovarian stimulation, 591 accumulated vitrified oocytes and 463 fresh oocytes were micro-injected with the same partner's semen sample. PGD-A was completed on 134 blastocysts from vitrified/warmed oocytes and 130 blastocysts from fresh oocytes.

Results: A mean of 9.6% euploid blastocyst per micro-injected vitrified/warmed oocytes and 11.4% euploid blastocyst per micro-injected fresh oocyte were obtained (p > 0.05). The euploidy and aneuploidy rates were comparable in blastocysts obtained from micro-injected vitrified/warmed oocytes and fresh oocytes (42.5 versus 40.8% and 57.5 versus 59.2%, p > 0.05). Implantation rates of euploid blastocysts were comparable between the two sources of oocytes (56.0% from vitrified/warmed oocytes versus 60.9% from fresh oocytes, p > 0.05).

Conclusions: Oocyte vitrification and warming do not generate aneuploidy in blastocysts. The number of viable euploid embryos for transfer can be increased by using accumulated vitrified oocytes together with fresh oocytes in ICSI.

Trial registration: NCT02820415 ClinicalTrials.gov.

Keywords: Aneuploidy; Next generation sequencing; Oocyte vitrification; Preimplantation genetic diagnosis; Preimplantation genetic screening.

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Conflict of interest statement

The authors declare that they have no conflict of interest.

Figures

Fig. 1
Fig. 1
Protocol steps of PGD-A on blastocysts from vitrified/warmed and fresh oocytes
See this image and copyright information in PMC

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