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Related Concept Videos

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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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Centrioles and Centrosomes01:13

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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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DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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Related Experiment Video

Updated: Jun 29, 2025

Live Cell Imaging to Assess the Dynamics of Metaphase Timing and Cell Fate Following Mitotic Spindle Perturbations
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Extra centrosomes delay DNA damage-driven tumorigenesis.

Vincent Z Braun1, Gerlinde Karbon1, Fabian Schuler1

  • 1Institute for Developmental Immunology, Biocenter, Medical University of Innsbruck, Innsbruck, Austria.

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Extra centrosomes, common in cancer, can surprisingly delay DNA damage-induced malignancies by triggering programmed cell death (apoptosis). This challenges the view that supernumerary centrosomes are always pro-tumorigenic.

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Area of Science:

  • Cell Biology
  • Cancer Research
  • Molecular Oncology

Background:

  • Deregulated centrosome numbers are a hallmark of human cancers.
  • The role of extra centrosomes in cancer progression (cause vs. consequence) is debated.
  • Targeting centrosome biogenesis is a potential therapeutic strategy.

Purpose of the Study:

  • To investigate the impact of centrosome amplification on cancer development.
  • To determine if extra centrosomes are intrinsically pro-tumorigenic or context-dependent.
  • To elucidate the molecular mechanisms linking extra centrosomes to cell death.

Main Methods:

  • Genetic manipulation of centrosome numbers in cancer models.
  • Induction of DNA damage to trigger malignancy.
  • Assessment of apoptosis pathways, including the PIDDosome complex and mitochondrial apoptosis.
  • Analysis of BCL2 overexpression effects.

Main Results:

  • Oncogene-driven blood cancers were unaffected by altered centrosome numbers.
  • DNA damage-induced malignancies were delayed in the presence of extra centrosomes.
  • Extra centrosomes induced apoptosis via the PIDDosome complex (Caspase-2, Raidd/Cradd, Pidd1).
  • Mitochondrial apoptosis was activated downstream of extra centrosomes, blocked by BCL2 overexpression.

Conclusions:

  • Centrosome amplification has context-dependent effects on cancer development.
  • Extra centrosomes can elicit a pro-death signal, delaying malignancy under specific conditions.
  • The findings challenge the universal assumption that supernumerary centrosomes are inherently pro-tumorigenic.