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Related Concept Videos

Meiosis II01:57

Meiosis II

Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each containing...
Meiosis II02:02

Meiosis II

Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
The Mitotic Spindle02:27

The Mitotic Spindle

The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
The Mitotic Spindle02:27

The Mitotic Spindle

The mitotic spindle—or spindle apparatus—is a eukaryotic, cytoskeletal structure made up of long protein fibers called microtubules. Formed during cell division, the spindle separates sister chromatids and moves them to opposite ends of a parental cell, where the now individual chromosomes are distributed to two daughter cell nuclei.
The bipolar configuration of the mitotic spindle facilitates chromosomal segregation, preparing the cell for division. One mechanism that ensures bipolar mitotic...
Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
Spindle Assembly02:50

Spindle Assembly

Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a microtubule array...

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Related Experiment Video

Updated: May 24, 2026

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

Spindle positioning in mammalian oocytes.

Agathe Chaigne1, Marie-Hélène Verlhac, Marie-Emilie Terret

  • 1Collège de France, Center for Interdisciplinary Research in Biology, UMR-CNRS7241/INSERM-U1050, 11 place Marcelin Berthelot, 75005 Paris, France.

Experimental Cell Research
|March 13, 2012
PubMed
Summary

Oocytes divide asymmetrically to conserve maternal resources for embryo development. This review explores how meiotic spindle positioning is controlled in mammalian oocytes to ensure proper cell division.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Reproductive Biology

Background:

  • Oocytes undergo asymmetric division to preserve maternal cytoplasm for embryonic development.
  • This process requires precise control over spindle positioning and daughter cell size relative to chromatin mass.

Purpose of the Study:

  • To review recent advancements in understanding meiotic spindle positioning in mammalian oocytes.
  • To highlight the control mechanisms governing asymmetric cell division in oogenesis.

Main Methods:

  • Literature review of recent studies on oocyte meiotic spindle positioning.
  • Analysis of molecular and cellular mechanisms regulating asymmetric division.

Main Results:

  • Oocyte asymmetric division is crucial for efficient resource allocation.
  • Spindle positioning is a key determinant of asymmetric cell division outcomes.
  • Multiple regulatory pathways coordinate spindle placement and cell size control.

Conclusions:

  • Understanding meiotic spindle control is vital for reproductive success.
  • Further research into these mechanisms could inform fertility treatments.
  • Asymmetric division is a fundamental process in mammalian oogenesis.