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The cell cycle occurs over approximately 24 hours (in a typical human cell) and in two distinct stages: interphase, which includes three phases of the cell cycle (G1, S, and G2), and mitosis (M). During interphase, which takes up about 95 percent of the duration of the eukaryotic cell cycle, cells grow and replicate their DNA in preparation for mitosis.
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Mechanistic three-dimensional model to study centrosome positioning in the interphase cell.

Subhendu Som1, Saptarshi Chatterjee1, Raja Paul1

  • 1Indian Association for the Cultivation of Science, Kolkata - 700032, India.

Physical Review. E
|February 21, 2019
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Summary

Mammalian cells maintain centrosome positioning away from the nucleus using combined cortical and nuclear forces. Without nuclear forces, the centrosome collapses onto the nucleus due to cortical forces.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Computational Biology

Background:

  • The centrosome's perinuclear positioning is vital for cellular functions like trafficking and mitosis.
  • Previous research focused on microtubule forces, often neglecting the nucleus's role in centrosome positioning.

Purpose of the Study:

  • To investigate the contributions of cell cortex and nuclear forces to centrosome positioning during interphase.
  • To understand how these forces maintain the centrosome at a finite distance from the nucleus.

Main Methods:

  • Coarse-grained simulation study.
  • Mathematical analysis of forces acting on the centrosome.

Main Results:

  • The combined forces from the cell cortex and nucleus actively maintain centrosome positioning.
  • Cortical forces alone cause the centrosome to collapse onto the nucleus.
  • Stable and unstable fixed points exist, determining centrosome distance based on force magnitudes.

Conclusions:

  • Cells utilize redundant mechanisms involving cortical and nuclear forces to stabilize centrosome positioning.
  • This positioning is essential for proper cellular function and progression through mitosis.