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Chromosome analysis of blastocysts derived from single pronuclear zygotes by array CGH and clinical outcomes by the transfer of single pronuclear zygotes

  • Assisted Reproduction Technologies
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Abstract

Purpose

This study aimed to explore the aneuploidy of blastocysts derived from single pronuclear (1PN) zygotes, almost 75% of which were regarded as diploid, using array CGH and examine the pregnancy outcomes.

Methods

Embryonic aneuploidy screening of sixteen embryos from 1PN zygotes and sixteen embryos from 2PN zygotes was performed using array CGH in study 1. In addition, the reproductive outcome of 1761 single blastocysts, after untested frozen-thawed blastocyst transfer in IVF/ICSI patients, was retrospectively analyzed and compared between the 1PN and 2PN groups in study 2.

Results

The aneuploidy rates were 30.8% (4/13) in 1PN IVF, 33.3% (1/3) in 1PN ICSI, 46.2% (6/13) in 2PN IVF, and 100% (3/3) in 2PN ICSI. The 1PN group achieved clinical pregnancy in 25.0% (7/28) of IVF and 30.0% (3/10) of ICSI, whereas these rates in the 2PN control group were 44.6% (557/1250) of IVF and 37.4% (177/473) of ICSI. No miscarriage occurred in the pregnancies from 1PN zygotes, whereas the rates of miscarriage in the 2PN control group were 22.6% (126/557) in IVF and 22.2% (39/176) in ICSI. The delivery rate was similar in all groups. Ten deliveries in the 1PN group showed no newborn malformation.

Conclusion

Within the limits of the small sample size, our results suggest that the aneuploidy and delivery rates of the blastocysts derived from 1PN zygotes are the same as those derived from 2PN zygotes. Blastocysts derived from 1PN zygotes may be used clinically and could increase the chance of pregnancy.

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Authors and Affiliations

  1. Goto Ladies Clinic, Takatsuki, Osaka, Japan

    Kimiko Hirata, Sakae Goto, Yoko Izumi, Misato Taguchi, Ayano Hayashi, Misono Fujioka & Keiko Nakanishi

  2. Department of Obstetrics and Gynecology, Shiga University of Medical Science, Otsu, Shiga, Japan

    Akiko Ishiko, Fuminori Kimura & Takashi Murakami

Authors
  1. Kimiko Hirata
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  2. Sakae Goto
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  3. Yoko Izumi
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  4. Misato Taguchi
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  5. Ayano Hayashi
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  6. Misono Fujioka
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  7. Akiko Ishiko
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  8. Keiko Nakanishi
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  9. Fuminori Kimura
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Corresponding author

Correspondence to Kimiko Hirata.

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The authors declare that they have no conflict of interest.

Ethics approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (Ethics Committee of the Japan Society of Obstetrics and Gynecology; No. 148) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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Hirata, K., Goto, S., Izumi, Y. et al. Chromosome analysis of blastocysts derived from single pronuclear zygotes by array CGH and clinical outcomes by the transfer of single pronuclear zygotes. J Assist Reprod Genet 37, 1645–1652 (2020). https://doi.org/10.1007/s10815-020-01800-y

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  • DOI: https://doi.org/10.1007/s10815-020-01800-y

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