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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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After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
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The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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Imaging Calcium in Drosophila at Egg Activation
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Egg Activation at Fertilization.

Zoltan Machaty1, Andrew R Miller2, Lu Zhang2

  • 1Department of Animal Sciences, Purdue University, Lilly Hall of Life Sciences, 915 W. State Street, West Lafayette, IN, 47907, USA. zmachaty@purdue.edu.

Advances in Experimental Medicine and Biology
|December 16, 2016
PubMed
Summary

Fertilization initiates new individual development through gamete union. Sperm triggers egg activation, resuming meiosis and enabling embryonic development.

Keywords:
ActivationCalciumEggFertilizationOocyteSignal transductionSperm

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Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Cell Biology

Background:

  • Fertilization is the fusion of male and female gametes, essential for initiating embryonic development.
  • Oogenesis, the formation of the female gamete (oocyte), involves complex cellular processes including meiosis and growth.
  • Oocyte maturation and arrest are critical checkpoints regulated by hormonal cues and cellular events.

Purpose of the Study:

  • To elucidate the intricate process of oogenesis and the events leading to fertilization.
  • To describe the resumption of meiosis and cell cycle progression post-fertilization.
  • To highlight the role of calcium signaling in activating the egg.

Main Methods:

  • Review of established knowledge on oogenesis, meiosis, and fertilization.
  • Analysis of cellular events including germ cell migration, differentiation, and meiotic progression.
  • Examination of hormonal regulation and intracellular signaling pathways involved in oocyte maturation and activation.

Main Results:

  • Primordial germ cells differentiate into oocytes, initiating meiosis and arresting at specific stages.
  • Oocytes undergo significant growth and hormonal-induced maturation, resuming meiosis.
  • Fertilization triggers a rise in intracellular calcium, completing meiosis and initiating the embryonic cell cycle.

Conclusions:

  • Oogenesis and oocyte maturation are precisely regulated processes preparing the female gamete for fertilization.
  • Sperm-induced calcium elevation is a key event activating the egg to complete meiosis and commence embryonic development.
  • Understanding these fundamental processes is crucial for reproductive biology and developmental studies.