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Related Concept Videos

Fertilization01:38

Fertilization

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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
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Removing the zona pellucida can decrease cytoplasmic fragmentations in human embryos: a pilot study using 3PN embryos

Keitaro Yumoto1, Toko Shimura1, Yasuyuki Mio2

  • 1Reproductive Centre, Mio Fertility Clinic, 2-1-1, Kuzumo-Minami, Yonago, Tottori, 683-0008, Japan.

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|April 15, 2020
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Summary
This summary is machine-generated.

Removing the zona pellucida (ZP) from abnormally fertilized human embryos (3PN) significantly reduced cytoplasmic fragmentation. This new method improves embryonic quality, offering hope for patients with fertility challenges.

Keywords:
Cytoplasmic fragmentationFirst cleavagePerivitelline threadsTime-lapseZP (zona pellucida)-free

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Area of Science:

  • Reproductive biology
  • Embryology
  • In vitro fertilization (IVF)

Background:

  • Cytoplasmic fragmentation is a common issue in early-stage human embryos, potentially impacting developmental potential.
  • Abnormally fertilized oocytes, such as those with three pronuclei (3PN), often exhibit increased fragmentation.

Purpose of the Study:

  • To develop and evaluate a novel method for reducing cytoplasmic fragmentation in human embryos.
  • To assess the impact of zona pellucida (ZP) removal on the developmental quality of 3PN embryos.

Main Methods:

  • The zona pellucida (ZP) was removed from 3PN zygotes at the pronuclear stage.
  • ZP-free embryos were cultured and monitored using time-lapse imaging to assess morphology and quality.

Main Results:

  • A significant reduction in cytoplasmic fragmentation was observed in ZP-free 3PN embryos compared to controls.
  • 68.1% of ZP-free embryos exhibited less than 20% fragmentation, indicating improved quality.
  • ZP removal did not impede normal embryonic development or cell adhesion.

Conclusions:

  • The zona pellucida (ZP) is not essential for normal embryonic development post-pronuclear stage.
  • ZP removal is an effective strategy to decrease cytoplasmic fragmentation and enhance embryo quality.
  • This innovative approach may improve outcomes for patients struggling to achieve high-quality embryos in IVF.