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Fertilization with human sperm bound to zona pellucida by pressing onto the oocyte membrane

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Abstract

This study aimed to determine whether fertilization can be obtained by assisted fusion of oocyte and sperm without breaking the oocyte membrane. A total of 79 infertile couples, each with at least one unfertilized oocyte after in vitro fertilization (IVF), were recruited. Sperm collected from the zona pellucida (ZP) were pressed onto the membrane of unfertilized oocytes at either 6 h or 24 h after IVF, a procedure that we designated as assisted sperm fusion insemination (ASFI). The results of ASFI were compared with those obtained in a previous trial on oocytes in which rescue intracytoplasmic sperm injection (ICSI) was performed at 6 h after IVF. Acrosome reaction (AR) rate of sperm bound to ZP, fertilization rate, degeneration rate, and blastocyst formation rate were evaluated. The AR rate of sperm collected from the ZP was significantly higher than that of the motile sperm recovered from around the oocytes but not bound to the ZP after IVF (98.0% vs. 28.6%). ASFI which was performed at 6 h after IVF yielded a mean fertilization rate of 73.4% (58/79), a degeneration rate of 0% (0/79) and a blastocyst formation rate of 60.8% (31/51). Rescue ICSI which was performed at 6 h after IVF yielded a mean fertilization rate of 70.0% (70/100), a degeneration rate of 4% (4/100) and a blastocyst formation rate of 42.4% (25/59). Binding of sperm to the ZP typically results in AR. ASFI with acrosome-reacted sperm collected from the ZP yielded the fertilization rates similar to those obtained with rescue ICSI.

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Correspondence to Shota Hatakeyama.

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All procedures performed in this study involving human participants were in accordance with the ethical standards of the national committee, and were approved by the Ethics Committee at the Yanaihara Women’s Clinic (YW18-02) and Gunma Paz University (PAZ18-22).

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

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Hatakeyama, S., Araki, Y., Ohgi, S. et al. Fertilization with human sperm bound to zona pellucida by pressing onto the oocyte membrane. Human Cell 33, 521–527 (2020). https://doi.org/10.1007/s13577-020-00348-4

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  • DOI: https://doi.org/10.1007/s13577-020-00348-4

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