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Related Concept Videos

The Cell Cycle Control System02:11

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The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
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The Cell Cycle Control System01:28

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The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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The Spindle Assembly Checkpoint02:19

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The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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Related Experiment Video

Updated: Feb 25, 2026

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Ensa controls S-phase length by modulating Treslin levels.

Sophie Charrasse1, Aicha Gharbi-Ayachi1, Andrew Burgess2,3

  • 1Université de Montpellier, Centre de Recherche de Biologie Cellulaire de Montpellier, Equipe Labellisée 'Ligue Contre le Cancer', CNRS UMR 5237, 1919 Route de Mende, 34293, Montpellier cedex 5, France.

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This summary is machine-generated.

The Greatwall/Ensa/PP2A-B55 pathway regulates cell division. Ensa knockdown extends S phase by decreasing Treslin, revealing a new cell cycle control mechanism.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The Greatwall (Gwl)/Ensa/PP2A-B55 pathway is crucial for regulating mitotic entry.
  • Ensa is a key substrate within this pathway, influencing mitotic phosphorylation events.

Purpose of the Study:

  • To investigate the role of Ensa, a Gwl substrate, in human cell cycle progression.
  • To elucidate the mechanism by which Ensa influences S phase duration and DNA replication.

Main Methods:

  • Human cell culture and knockdown of Ensa expression.
  • Analysis of S phase duration, replication fork density, and protein levels (Treslin).
  • Rescue experiments involving Treslin overexpression.

Main Results:

  • Ensa knockdown significantly extends S phase and reduces replication fork density.
  • Ensa depletion leads to decreased levels of Treslin, a protein vital for replication origin firing.
  • Overexpression of Treslin rescues the extended S phase phenotype caused by Ensa depletion.

Conclusions:

  • A novel Gwl/Ensa-dependent pathway controls S phase duration.
  • This pathway regulates Treslin levels via ubiquitin-proteasome degradation.
  • Findings reveal a new mechanism for controlling DNA replication timing and cell cycle progression.