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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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Updated: Mar 30, 2026

Live Cell Imaging to Assess the Dynamics of Metaphase Timing and Cell Fate Following Mitotic Spindle Perturbations
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Chronic centrosome amplification without tumorigenesis.

Benjamin Vitre1, Andrew J Holland1, Anita Kulukian2

  • 1San Diego Branch, Ludwig Institute for Cancer Research, La Jolla, CA 92093;

Proceedings of the National Academy of Sciences of the United States of America
|November 19, 2015
PubMed
Summary
This summary is machine-generated.

Supernumerary centrosomes, while causing mitotic errors, do not drive tumor formation alone. Even with Polo-like kinase 4 (Plk4) overexpression, tumor development requires other factors, independent of p53 status.

Keywords:
Plk4 kinasecentrosome amplificationp53tumorigenesis

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Area of Science:

  • Cell Biology
  • Cancer Biology
  • Genetics

Background:

  • Centrosomes are crucial for cell division, organizing microtubules for spindle assembly and chromosome segregation.
  • Centrosome amplification is frequently observed in aneuploid cancer cells, suggesting a role in tumorigenesis.
  • Polo-like kinase 4 (Plk4) is a key regulator of centrosome duplication.

Purpose of the Study:

  • To investigate whether centrosome amplification is sufficient to drive tumor development.
  • To determine the role of Polo-like kinase 4 (Plk4) in inducing centrosome amplification and subsequent tumor formation.
  • To assess the interplay between centrosome amplification and the p53 tumor suppressor pathway in tumorigenesis.

Main Methods:

  • Developed genetically engineered mice with inducible centrosome amplification via Cre-recombinase mediated Plk4 overexpression.
  • Analyzed mitotic errors and proliferation in mouse fibroblasts with elevated Plk4.
  • Examined tumor development in various tissues (liver, skin, thymus) of mice with induced centrosome amplification, both with and without functional p53.

Main Results:

  • Elevated Plk4 induced supernumerary centrosomes and mitotic errors in fibroblasts, but sustained proliferation required p53 inactivation.
  • Centrosome amplification in liver and skin of p53-proficient mice did not lead to spontaneous tumors or enhance chemically induced skin tumors.
  • In p53-deficient mice, Plk4 overexpression caused widespread centrosome amplification but did not increase tumor incidence or alter the development of thymic lymphomas.

Conclusions:

  • Supernumerary centrosomes, induced by Plk4 overexpression, are not sufficient to initiate tumor formation.
  • The presence of supernumerary centrosomes does not drive tumorigenesis independently of other genetic alterations, such as p53 loss.
  • Centrosome amplification alone is not a direct driver of cancer development.