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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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Attachment of Sister Chromatids02:57

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As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules.  Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall...
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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).
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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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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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Forces Acting on Chromosomes02:11

Forces Acting on Chromosomes

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During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis. 
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Chromosome condensation mechanically primes the nucleus for mitosis.

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Related Experiment Video

Updated: Jul 5, 2025

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
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Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins

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The LINC complex ensures accurate centrosome positioning during prophase.

Joana T Lima1,2,3, António J Pereira1, Jorge G Ferreira4,2

  • 1Instituto de Investigação e Inovação em Saúde (i3S), Porto, Portugal.

Life Science Alliance
|January 16, 2024
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Summary

The prophase nucleus provides a key signal for centrosome positioning during early mitosis, independent of external cues. This mechanism involves the linker of nucleoskeleton and cytoskeleton complex, ensuring proper spindle assembly.

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Last Updated: Jul 5, 2025

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
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Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins

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Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes
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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
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Area of Science:

  • Cell Biology
  • Mitosis
  • Cytoskeletal Dynamics

Background:

  • Centrosome separation and positioning are crucial for accurate cell division.
  • Nuclear cues regulating this process are largely unidentified.
  • Understanding these cues is vital for comprehending mitotic fidelity.

Purpose of the Study:

  • To investigate the role of the prophase nucleus in centrosome positioning.
  • To identify nuclear mechanisms governing early mitotic centrosome placement.
  • To elucidate how nuclear-cytoskeletal interactions ensure spindle assembly.

Main Methods:

  • Cell micropatterning techniques to control cell shape and orientation.
  • High-resolution live-cell imaging for dynamic process observation.
  • Quantitative 3D cellular reconstruction for spatial analysis.

Main Results:

  • A nuclear signal regulates centrosome positioning in RPE-1 cells, independent of external factors.
  • The linker of nucleoskeleton and cytoskeleton complex is essential for this nuclear regulation.
  • Dynein loading onto the nuclear envelope is controlled, guiding centrosomes along the shortest nuclear axis before nuclear envelope breakdown.

Conclusions:

  • The nucleus actively participates in centrosome positioning through a defined mechanism.
  • Nuclear-cytoskeletal coupling, mediated by the LINC complex, ensures robust positioning.
  • This process is critical for efficient mitotic spindle formation and accurate cell division.