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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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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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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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Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Microtubule Formation01:23

Microtubule Formation

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Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation...
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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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Related Experiment Video

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Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
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Centrosome Assembly: Reconstructing the Core Cartwheel Structure In Vitro.

Gaëlle Marteil1, Marco António Dias Louro1, Mónica Bettencourt-Dias1

  • 1Instituto Gulbenkian de Ciência, Oeiras, 2780-156, Portugal.

Current Biology : CB
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Summary

Researchers developed a new cell-free assay to study centriole assembly. This method reconstitutes the initial cartwheel structure, proposing a novel model for its formation and growth.

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Area of Science:

  • Cell Biology
  • Structural Biology
  • Microscopy

Background:

  • Centrioles are fundamental microtubule-based cylindrical structures.
  • They are essential for the formation of centrosomes and cilia, critical cellular components.
  • Understanding centriole assembly is key to deciphering cellular organization and function.

Purpose of the Study:

  • To develop a novel cell-free assay for reconstituting early centriole assembly intermediates.
  • To investigate the formation and growth mechanisms of the centriole cartwheel structure.
  • To propose a new model for centriole cartwheel biogenesis.

Main Methods:

  • Development of a cell-free system to mimic centriole assembly in vitro.
  • Biochemical and imaging techniques to analyze the reconstituted cartwheel structure.
  • Structural analysis to elucidate the assembly pathway and growth dynamics.

Main Results:

  • Successful reconstitution of the initial centriole assembly structure, the cartwheel, in a cell-free system.
  • Identification of key molecular interactions and steps involved in cartwheel formation.
  • Evidence supporting a new model for the sequential assembly and expansion of the cartwheel.

Conclusions:

  • The new cell-free assay provides a powerful tool to study centriole assembly dynamics.
  • The proposed model offers new insights into the fundamental mechanisms of centriole biogenesis.
  • This research advances our understanding of centrosome and cilia formation.