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Related Concept Videos

Centrioles and Centrosomes01:13

Centrioles and Centrosomes

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Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
Near the end of the prophase, also called late prophase or...
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Centrosome Duplication02:25

Centrosome Duplication

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The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
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Meiosis II02:02

Meiosis II

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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,...
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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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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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Separation of Sister Chromatids02:17

Separation of Sister Chromatids

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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.
At the onset of anaphase, separase, a proteolytic enzyme, is...
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Related Experiment Video

Updated: Sep 30, 2025

Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes
09:39

Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes

Published on: December 20, 2014

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The Centriole's Role in Miscarriages.

Tomer Avidor-Reiss1,2, Luke Achinger1, Rustem Uzbekov3,4

  • 1Department of Biological Sciences, University of Toledo, Toledo, OH, United States.

Frontiers in Cell and Developmental Biology
|March 18, 2022
PubMed
Summary
This summary is machine-generated.

Centrioles in sperm are crucial for reproduction but can cause miscarriages in many mammals due to species-specific adaptations. House mice avoid this by losing centrioles, enabling successful centriole-independent reproduction.

Keywords:
centriolecentrosomefertilitymiscarriagesperm

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Imaging Centrosomes in Fly Testes
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Related Experiment Videos

Last Updated: Sep 30, 2025

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Live Cell Imaging to Assess the Dynamics of Metaphase Timing and Cell Fate Following Mitotic Spindle Perturbations
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Area of Science:

  • Cell Biology
  • Reproductive Biology
  • Evolutionary Biology

Background:

  • Centrioles are vital organelles forming centrosomes and cilia, essential for cell function and development.
  • Sperm centrioles, located in the neck, play a poorly understood role in fertility and early embryo development.
  • Most mammals have two sperm centrioles, with one canonical and one atypical form, suggesting evolutionary adaptations.

Purpose of the Study:

  • To investigate the role of centrioles in mammalian fertility and early embryonic development.
  • To explore the evolutionary adaptations of centrioles in sperm across different species.
  • To understand the link between centriole structure, function, and reproductive outcomes like aneuploidy and miscarriage.

Main Methods:

  • Comparative analysis of centriole structure and composition in sperm across various mammalian species.
  • Investigating the impact of centriole presence and modifications on fertilization and early embryo development.
  • Examining the evolutionary trajectory of centrioles in reproduction, contrasting centriole-dependent and independent strategies.

Main Results:

  • Species-specific adaptations in centrioles of humans, bovines, and other mammals are linked to a high rate of post-fertilization malfunction, leading to aneuploidy and miscarriages.
  • House mice exhibit centriole-independent reproduction, having lost sperm centrioles and thus overcoming a major cause of miscarriage.
  • The spermatozoan neck's strategic location facilitates evolutionary innovations in centriole function, impacting both pre- and post-fertilization events.

Conclusions:

  • Evolutionary adaptations in mammalian sperm centrioles, while enabling species-specific traits, can compromise reproductive success and lead to embryonic developmental issues.
  • The loss of centrioles in house mice represents an evolutionary adaptation towards centriole-independent reproduction, effectively preventing miscarriages.
  • Understanding centriole diversity and function is critical for addressing infertility and recurrent pregnancy loss in humans and other mammals.