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Related Concept Videos

The Spindle Assembly Checkpoint02:19

The Spindle Assembly Checkpoint

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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.
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...
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Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

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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...
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Meiosis II01:57

Meiosis II

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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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Meiosis I03:09

Meiosis I

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Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
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Spermatogenesis01:22

Spermatogenesis

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Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...
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What is Meiosis?01:36

What is Meiosis?

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Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from the mother and half from the father. Following meiosis, the resulting haploid eggs or sperm only contain 23 chromosomes; however, each of these chromosomes contains a unique combination of parental information that results from the meiotic process of crossing over.
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Related Experiment Video

Updated: Aug 13, 2025

Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes
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In vitro spermatogenesis: Why meiotic checkpoints matter.

Qijing Lei1, Ans M M van Pelt1, Geert Hamer1

  • 1Center for Reproductive Medicine, Reproductive Biology Laboratory, Amsterdam Reproduction and Development Research Institute, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.

Current Topics in Developmental Biology
|January 21, 2023
PubMed
Summary

Generating functional sperm in vitro is crucial for male fertility treatments. However, key meiotic events and checkpoints are often missing in current in vitro spermatogenesis methods, hindering clinical application.

Keywords:
In vitro meiosisIn vitro spermatogenesisMale fertility preservationMeiotic checkpointsSpermatocytes

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Area of Science:

  • Reproductive Biology
  • Cell Biology
  • Genetics

Background:

  • Successful in vitro spermatogenesis could revolutionize male fertility preservation and treatment for impaired spermatogenesis.
  • Current methods often fail to fully recapitulate meiosis, a critical process for generating functional gametes.

Approach:

  • This review analyzes meiotic events and checkpoints investigated in prior in vitro spermatogenesis studies.
  • It identifies gaps in the evaluation criteria for in vitro-derived spermatids.

Key Points:

  • Major meiotic events like DNA double-strand break initiation and chromosome synapsis are achievable in vitro.
  • Crucial aspects such as crossover formation, chiasma frequency, and meiotic checkpoint function are frequently overlooked.
  • Complete spermiogenesis, the differentiation of spermatids, has not been achieved via current cell culture strategies.

Conclusions:

  • Establishing robust criteria for evaluating in vitro meiosis is essential for generating functional spermatids.
  • Understanding and incorporating meiotic checkpoints are critical for advancing in vitro spermatogenesis protocols.
  • Further research is needed to overcome current limitations for potential clinical use in male infertility treatments.