Objective:To analyze the genetic and clinical outcomes of blastocysts derived from 0PN oocytes after IVF/ ICSI.Methods: This retrospective observational study included patients aged 40 years or younger submitted to IVF/ICSI with their own oocytes and with blastocysts derived from 0PN oocytes between January 2015 and April 2018. The clinical outcomes of 0PN blastocyst transfers were analyzed. Genetic tests were performed on biopsied 0PN blastocysts with Next Generation Sequencing.Results: A total of 27 0PN blastocysts were transferred, yielding an implantation rate of 48.0% and an ongoing pregnancy rate of 50.0%. The transfers resulted in 13 live births (59.0% live birth rate). Genetic test results revealed that four of the 17 0PN blastocysts biopsied were 46XX; three were 46XY; and 10 were aneuploid embryos, awarding a diploid rate to 76.4% (13/17).Conclusion: Almost half of the 0PN blastocysts implanted (48.0%) and 13 healthy babies were born. More than three quarters (76.4%) of the 0PN blastocysts were diploid, thus ruling out the possibility of parthenogenetic activation. Our study indicated that the transfer of 0PN blastocysts is a safe, worthy option when the number of normal 2PN embryos is insufficient.

Male factor infertility was associated with decreased progression to clinical pregnancy following successful implantation of a euploid embryo, but once clinical pregnancy was established had no impact on miscarriage.IMPACT STATEMENT: Low sperm motility may reflect an underlying defect in spermatogenesis, perhaps related to DNA methylation or other epigenetic changes, that impacts embryo growth and development despite successful initiating of implantation. Further investigation into the downstream effects of male infertility beyond fertilization will confirm and elucidate the pathophysiology of these findings.