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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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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.
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Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
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Related Experiment Video

Updated: Mar 1, 2026

Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
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Pre-RC Protein MCM7 depletion promotes mitotic exit by Inhibiting CDK1 activity.

Dianpeng Zheng1, Sichao Ye1, Xiuyun Wang1

  • 1Institute of Biotherapy, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, Guangdong, China.

Scientific Reports
|June 8, 2017
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Summary

Mini-chromosome maintenance protein 7 (MCM7) associates with chromatin during M phase, and its depletion accelerates mitotic exit by regulating CDK1 activity and promoting sister chromatid segregation.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Mini-chromosome maintenance (MCM) proteins are essential for DNA replication initiation and elongation.
  • MCM7 is a core subunit of the MCM complex, crucial for cell cycle progression.

Purpose of the Study:

  • To investigate the role of MCM7 beyond DNA replication, specifically during mitosis.
  • To elucidate the function of MCM7 in regulating mitotic exit and cell division.

Main Methods:

  • RNA interference (siRNA) to deplete MCM7 expression.
  • Western blotting to assess protein levels and activity (e.g., CDK1, RAD21).
  • Immunofluorescence microscopy to examine MCM7 localization and mitotic phenotypes (e.g., spindle formation, cytokinesis).

Main Results:

  • MCM7 remains associated with chromatin throughout M phase.
  • MCM7 depletion accelerates mitotic exit, leading to CDK1 inactivation.
  • Loss of MCM7 promotes cohesin/RAD21 cleavage, resulting in premature sister chromatid segregation and aberrant mitosis.
  • MCM7 co-localizes with tubulin, suggesting a role in spindle dynamics.

Conclusions:

  • MCM7 plays a novel role in regulating mitotic progression and exit.
  • MCM7 influences CDK1 activity, cohesin cleavage, and potentially spindle formation.
  • These findings suggest MCM7 is involved in ensuring proper cell division by preventing premature cytokinesis.