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Related Concept Videos

The Mitotic Spindle02:27

The Mitotic Spindle

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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...
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Spindle Assembly02:50

Spindle Assembly

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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...
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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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Meiosis I01:49

Meiosis I

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Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
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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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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: Jan 25, 2026

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

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Meiotic Spindle Has a Soft Spot.

Juraj Simunić1, Iva M Tolić1

  • 1Division of Molecular Biology, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia.

Developmental Cell
|April 25, 2019
PubMed
Summary

Meiotic spindle microtubules respond dynamically to forces based on their location within the spindle. Microtubule organization and crosslinking motor proteins dictate this force-sensing mechanism during chromosome segregation.

Area of Science:

  • Cell biology
  • Molecular biology
  • Biophysics

Background:

  • Chromosome alignment and segregation are crucial for cell division.
  • The meiotic spindle, composed of microtubules and motor proteins, drives these processes.
  • Understanding how the spindle responds to forces is key to cell division fidelity.

Purpose of the Study:

  • To investigate how meiotic spindle microtubules sense and respond to forces.
  • To determine the role of microtubule organization and motor proteins in force perception.

Main Methods:

  • Utilized advanced microscopy techniques to visualize meiotic spindle dynamics.
  • Employed biophysical methods to measure forces exerted on microtubules.
  • Analyzed microtubule organization and motor protein distribution within the spindle.

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Preparation of Meiotic Chromosome Spreads from Mouse Spermatocytes
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Related Experiment Videos

Last Updated: Jan 25, 2026

Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing
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Published on: October 11, 2015

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Preparation of Meiotic Chromosome Spreads from Mouse Spermatocytes
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Main Results:

  • Meiotic spindle microtubules exhibit location-dependent responses to forces.
  • Microtubule organization influences force transmission and sensing.
  • Specific motor proteins are critical for mediating differential force responses.

Conclusions:

  • The meiotic spindle is a sophisticated structure capable of differential force sensing.
  • Microtubule organization and motor proteins create a spatially regulated force-response system.
  • This mechanism ensures accurate chromosome segregation during meiosis.