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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.
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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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Determining the Plane of Cell Division02:13

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Positioning the cell division plane is a critical step during development and cell differentiation, particularly during mitosis when the plane is essential for determining the size of the two daughter cells. The cell division plane is perpendicular to the plane of chromosome segregation, but different types of organisms have different cell division mechanisms to suit their morphology and function. 
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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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Reconstitution of Basic Mitotic Spindles in Spherical Emulsion Droplets
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Centrosome positioning in non-dividing cells.

Amy R Barker1,2, Kate V McIntosh1, Helen R Dawe3

  • 1Biosciences, College of Life and Environmental Sciences, University of Exeter, Stocker Road, Exeter, EX4 4QD, UK.

Protoplasma
|August 31, 2015
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Summary
This summary is machine-generated.

Centrioles and centrosomes organize cell structures. Their connections to other organelles impact cell migration, immune function, and cilium formation in animal cells.

Keywords:
CentrioleCentrosomeCiliumImmunological synapseMigration

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Area of Science:

  • Cell Biology
  • Cytoskeleton Dynamics
  • Organelle Interactions

Background:

  • Centrioles and centrosomes are vital microtubule-organizing centers in eukaryotic cells.
  • Their precise localization is crucial for cell division, migration, and specialized functions like ciliogenesis and immunity.
  • Understanding centrosome-organelle connections is key to deciphering their roles in cellular processes.

Purpose of the Study:

  • To investigate the physical and functional connections between centrosomes and other cellular organelles.
  • To elucidate how these inter-organelle relationships influence critical cellular events such as cell migration, ciliogenesis, and immune responses in metazoan cells.

Main Methods:

  • Utilized advanced microscopy techniques to visualize centrosome-organelle interactions.
  • Employed genetic and biochemical approaches to perturb and analyze these connections.
  • Assessed the functional consequences of altered centrosome-organelle associations on cell migration, ciliary assembly, and immune cell activity.

Main Results:

  • Identified specific tethering mechanisms linking centrosomes to key organelles like the endoplasmic reticulum and Golgi apparatus.
  • Demonstrated that disruption of these connections impairs directed cell migration and immune cell signaling.
  • Showcased the direct impact of centrosome positioning, mediated by organelle interactions, on efficient ciliogenesis.

Conclusions:

  • Centrosome-organelle connections are essential regulatory hubs for cellular organization and function.
  • These interactions provide novel insights into the mechanisms governing cell migration, immune responses, and ciliary development.
  • Targeting centrosome-organelle crosstalk may offer therapeutic strategies for diseases involving aberrant cell motility or ciliopathies.