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Related Concept Videos

Oogenesis01:22

Oogenesis

Oogenesis,  the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
Each primary oocyte is surrounded by a layer of pre-granulosa cells, forming what is known...
Oogenesis02:07

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
Cleavage and Blastulation01:33

Cleavage and Blastulation

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.
Ovarian Cycle01:27

Ovarian Cycle

The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle length...
Fertilization01:38

Fertilization

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...
Folliculogenesis01:20

Folliculogenesis

Folliculogenesis is the development of ovarian follicles, the specialized structures within the ovarian cortex where oogenesis, or egg development, occurs. This process is essential for female reproductive health and begins during fetal development when primordial follicles are formed. Each primordial follicle comprises a primary oocyte in the center, surrounded by a single layer of squamous pre-granulosa cells. These follicles remain dormant in late prophase I of meiosis until triggered by...

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Related Experiment Video

Updated: May 19, 2026

Nuclear Migration in the Drosophila Oocyte
04:17

Nuclear Migration in the Drosophila Oocyte

Published on: May 13, 2021

The oocyte-to-embryo transition.

Scott Robertson1, Rueyling Lin

  • 1Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, TX 75390-9148, USA. scott.robertson@utsouthwestern.edu

Advances in Experimental Medicine and Biology
|August 9, 2012
PubMed
Summary
This summary is machine-generated.

The oocyte-to-embryo transition in C. elegans is a rapid, post-transcriptional process. Key regulators like MBK-2 kinase and OMA-1/OMA-2 proteins ensure precise timing through protein degradation and translational repression.

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Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II
10:39

Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II

Published on: February 26, 2018

Related Experiment Videos

Last Updated: May 19, 2026

Nuclear Migration in the Drosophila Oocyte
04:17

Nuclear Migration in the Drosophila Oocyte

Published on: May 13, 2021

Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II
10:39

Chromatin Spread Preparations for the Analysis of Mouse Oocyte Progression from Prophase to Metaphase II

Published on: February 26, 2018

Area of Science:

  • Developmental Biology
  • Cell Biology
  • Molecular Biology

Background:

  • The oocyte-to-embryo transition is a critical biological process.
  • This transition involves oocyte maturation, fertilization, and subsequent embryonic development.
  • Rapid progression necessitates precise molecular event timing.

Purpose of the Study:

  • To review the coordinated temporal regulation of the oocyte-to-embryo transition.
  • To highlight key molecular players and regulatory mechanisms.
  • To focus on post-transcriptional regulation in this process.

Main Methods:

  • Review of existing literature on oocyte-to-embryo transition.
  • Analysis of molecular events and their temporal coordination.
  • Focus on post-transcriptional regulatory mechanisms.

Main Results:

  • The oocyte-to-embryo transition is rapid and occurs without new transcription.
  • MBK-2 kinase and OMA-1/OMA-2 proteins are central regulators.
  • Regulation relies on pre-existing maternal factors, protein modification, degradation, and translational repression.

Conclusions:

  • Post-transcriptional regulation is crucial for the oocyte-to-embryo transition.
  • Protein degradation and translational repression are critical control points.
  • Precise temporal coordination ensures successful embryonic development.