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In Vitro Fertilization01:24

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In vitro fertilization (IVF) is a form of assisted reproductive technology where an egg is fertilized with sperm in a controlled laboratory environment before transferring the resulting embryo into the uterus. This process is designed to help individuals and couples experiencing difficulties conceiving.
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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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Mouse Round Spermatid Injection
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Understanding fertilization through intracytoplasmic sperm injection (ICSI).

Queenie V Neri1, Bora Lee1, Zev Rosenwaks1

  • 1The Ronald O. Perelman and Claudia Cohen Center for Reproductive Medicine, Weill Cornell Medical College, New York, NY, USA.

Cell Calcium
|December 3, 2013
PubMed
Summary

Assisted reproductive technologies like ICSI help overcome male infertility. However, fertilization failure can still occur due to oocyte or sperm factors, requiring further diagnosis and treatment.

Keywords:
Assisted oocyte activationCalcium influxFailed fertilizationICSIOocyte activationPLCζSperm cytosolic factor

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Area of Science:

  • Reproductive biology
  • Assisted reproductive technology

Background:

  • Male factor infertility affects nearly half of couples undergoing in vitro fertilization.
  • Intracytoplasmic sperm injection (ICSI) has significantly improved outcomes for male infertility.
  • Early fertilization and syngamy processes are better understood through ICSI.

Purpose of the Study:

  • To review fertilization and its failure in assisted reproductive technologies.
  • To describe methods for diagnosing and treating clinical fertilization failure.

Main Methods:

  • Review of scientific literature on fertilization and assisted reproductive technologies.
  • Analysis of causes for fertilization failure beyond ICSI.
  • Description of diagnostic and therapeutic approaches for fertilization failure.

Main Results:

  • ICSI effectively addresses many cases of male factor infertility.
  • Fertilization failure can persist due to ooplasmic dysmaturity or lack of oocyte-activating factors in sperm.
  • Specific diagnostic and treatment strategies are being developed for refractory cases.

Conclusions:

  • While ICSI is a powerful tool, persistent fertilization failure necessitates exploring oocyte and sperm-related factors.
  • Further research into oocyte activation mechanisms and sperm factors is crucial.
  • Developing targeted diagnostic and treatment protocols is essential for improving success rates in assisted reproduction.