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Related Concept Videos

M-Cdk Drives Transition Into Mitosis02:15

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Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
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Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
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Meiosis II02:02

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Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
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Live Cell Imaging to Assess the Dynamics of Metaphase Timing and Cell Fate Following Mitotic Spindle Perturbations
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Model scenarios for switch-like mitotic transitions.

P K Vinod1, Bela Novak1

  • 1OCISB, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK.

FEBS Letters
|February 17, 2015
PubMed
Summary
This summary is machine-generated.

Cell cycle transitions are abrupt due to feedback regulation. This involves the Greatwall kinase pathway, counteracting the PP2A-B55 phosphatase and its inhibitors like ENSA, ensuring precise mitotic entry and exit.

Keywords:
Biochemical kineticsBistabilityGreatwall-kinaseMitotic controlPhosphatase

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Examination of Mitotic and Meiotic Fission Yeast Nuclear Dynamics by Fluorescence Live-cell Microscopy
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Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
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Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
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Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Mitotic entry and exit require precise regulation of Cdk1-phosphorylated proteins.
  • The PP2A-B55 phosphatase is inhibited by ENSA and Arpp19 during M phase.
  • These inhibitors are activated by the Greatwall kinase.

Purpose of the Study:

  • To investigate the regulatory mechanisms governing the abruptness of cell cycle transitions.
  • To understand the role of feedback regulation in mitotic entry and exit.
  • To explain the switch-like characteristics of cell cycle progression.

Main Methods:

  • Mathematical modeling of biochemical pathways.
  • Analysis of feedback regulation in the Cdk1-PP2A-B55-ENSA axis.
  • Investigating the role of Greatwall kinase and its regulatory partners.

Main Results:

  • Mutual antagonism between PP2A-B55 and its inhibitor ENSA is insufficient to explain switch-like cell cycle transitions.
  • Feedback regulation of the Greatwall activating kinase and/or inactivating phosphatase explains the abruptness of mitotic entry and exit.
  • ENSA acts as an unfair substrate, inhibiting PP2A-B55 activity.

Conclusions:

  • Feedback mechanisms involving the Greatwall kinase pathway are crucial for the switch-like nature of cell cycle transitions.
  • This regulation ensures precise control over mitotic entry and exit.
  • The study provides a model for understanding rapid cell cycle progression.