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Related Concept Videos

The Spindle Assembly Checkpoint02:19

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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.
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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...
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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
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Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function. 
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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.
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Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
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Updated: Jul 2, 2025

Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes
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C. elegans spermatocyte divisions show a weak spindle checkpoint response.

Shang-Yang Chen1, Pu-Wei Cheng1, Hsiao-Fang Peng1

  • 1Department of Clinical Laboratory Science and Medical Biotechnology, College of Medicine, National Taiwan University, Taipei 10048, Taiwan.

Journal of Cell Science
|February 19, 2024
PubMed
Summary

Male meiosis II in Caenorhabditis elegans is not regulated by the spindle assembly checkpoint (SAC). Male meiosis I shows only a weak SAC response, unlike typical cell divisions.

Keywords:
Chromosome segregationMale meiotic divisionsProteasomeSecurinSpindle assembly checkpoint

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Area of Science:

  • Cell Biology
  • Genetics
  • Reproductive Biology

Background:

  • Male meiotic division involves two chromosome separation events without apparent pausing.
  • Spermatocyte divisions are less stringently regulated compared to mitotic cells.

Purpose of the Study:

  • To investigate the role of the spindle assembly checkpoint (SAC) pathway in Caenorhabditis elegans spermatogenesis.
  • To understand the regulation of male meiotic divisions.

Main Methods:

  • Observed the intensity of chromosome-associated outer kinetochore protein BUB-1 and SAC effector MDF-1.
  • Analyzed the degradation of securin during male meiosis.
  • Inhibited proteasome-dependent protein degradation.
  • Perturbed spindle integrity.

Main Results:

  • BUB-1 and MDF-1 intensities oscillate between the two meiotic divisions.
  • Securin is degraded during the first meiotic division and remains undetectable during the second.
  • Inhibition of proteasome-dependent degradation halted the first meiotic division but not the second.
  • Spindle integrity perturbation minimally affected meiotic division durations.

Conclusions:

  • Male meiosis II is independent of spindle assembly checkpoint (SAC) regulation.
  • Male meiosis I exhibits only a weak checkpoint response.
  • These findings reveal distinct regulatory mechanisms in male meiosis.