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Related Concept Videos

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...
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...
The Spindle Assembly Checkpoint02:19

The Spindle Assembly Checkpoint

The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
The Spindle Assembly Checkpoint02:19

The Spindle Assembly Checkpoint

The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
The Cell Cycle Control System01:28

The Cell Cycle Control System

The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...
The Cell Cycle Control System02:11

The Cell Cycle Control System

The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...

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Related Experiment Video

Updated: Jun 12, 2026

Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes
10:09

Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes

Published on: September 13, 2022

Genome integrity checkpoints in mammalian oogenesis.

John C Schimenti1

  • 1Dept. of Biomedical and Translational Sciences, Dept. of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14850.

Biology of Reproduction
|June 11, 2026
PubMed
Summary

Maintaining germline integrity is vital for preventing infertility and birth defects. Quality control checkpoints during oogenesis eliminate defective oocytes, crucial for female reproductive health and aging.

Area of Science:

  • Reproductive Biology
  • Genetics
  • Cell Biology

Background:

  • Germline integrity is essential for preventing infertility, pregnancy loss, and birth defects.
  • Mammalian females have a finite oocyte pool, making oogenesis quality control critical.
  • Meiosis, the process of oocyte maturation, involves programmed DNA double-strand breaks (DSBs) essential for chromosome pairing and segregation.

Purpose of the Study:

  • To review the genetic quality control mechanisms that safeguard oogenesis.
  • To highlight the role of DNA damage and synapsis checkpoints in oocyte quality.
  • To underscore the relevance of these mechanisms to infertility and reproductive aging.

Main Methods:

  • Review of genetic studies in model organisms.
  • Analysis of DNA repair pathways and damage sensors.

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Detection of DNA Double-Stranded Breaks in Mouse Oocytes

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Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing
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Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing

Published on: October 11, 2015

Related Experiment Videos

Last Updated: Jun 12, 2026

Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes
10:09

Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes

Published on: September 13, 2022

Detection of DNA Double-Stranded Breaks in Mouse Oocytes
07:46

Detection of DNA Double-Stranded Breaks in Mouse Oocytes

Published on: June 23, 2023

Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing
09:16

Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing

Published on: October 11, 2015

  • Examination of downstream effectors like p53 and TAp63.

    • Main Results:

    • Quality control checkpoints detect unrepaired DNA damage and defective chromosome synapsis during oogenesis.
    • These checkpoints share mechanistic overlap, utilizing DNA repair proteins and damage sensors.
    • Defective oocytes are eliminated from the ovarian reserve via pathways involving p53 and TAp63.

    Conclusions:

    • Genetic quality control mechanisms are crucial for preserving chromosome integrity during oogenesis.
    • Dysfunctional checkpoints contribute to infertility and reproductive aging.
    • Understanding these pathways is key to addressing reproductive health challenges.