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The Cell Cycle Control System

The Cell Cycle Control System

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.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...

The Cell Cycle Control System

The Cell Cycle Control System

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...

The Cell Cycle Control System

The Cell Cycle Control System

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...

Inhibition of Cdk Activity

Inhibition of Cdk Activity

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...

Positive Regulator Molecules

Positive Regulator Molecules

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.

Positive Regulator Molecules

Positive Regulator Molecules

To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.

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Related Experiment Video

Updated: Jun 5, 2026

Manipulation and Analysis of Cell Cycle-Dependent Processes in Budding Yeast

Manipulation and Analysis of Cell Cycle-Dependent Processes in Budding Yeast

Published on: September 26, 2025

A new in vitro system for activating the cell cycle checkpoint.

Jingna Wang¹, Staci Engle, Youwei Zhang

¹Department of Pharmacology, Case Western Reserve University, Cleveland, OH, USA.

Cell Cycle (Georgetown, Tex.)

|January 22, 2011

Summary

This study shows that the in vitro transcription and translation (IVTNT) system can mimic DNA damage responses, inducing crucial protein phosphorylation for cell cycle checkpoints. This system aids in understanding genome stability mechanisms.

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Last Updated: Jun 5, 2026

Manipulation and Analysis of Cell Cycle-Dependent Processes in Budding Yeast

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Published on: September 26, 2025

Temporal Tracking of Cell Cycle Progression Using Flow Cytometry without the Need for Synchronization

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Analysis of Cell Cycle Position in Mammalian Cells

Analysis of Cell Cycle Position in Mammalian Cells

Published on: January 21, 2012

Area of Science:

Molecular Biology
Cell Biology
Biochemistry

Background:

Cell cycle checkpoints are essential for genome stability, detecting and repairing DNA damage.
Key regulators include PI3K-related protein kinases (PIKKs) like ATR and ATM, which phosphorylate Chk1 and Chk2.
Complete understanding of checkpoint activation, maintenance, and termination remains elusive.

Purpose of the Study:

To investigate the utility of the in vitro transcription and translation (IVTNT) system for studying cell cycle checkpoint activation.
To determine if the IVTNT system can faithfully replicate in vivo DNA damage response signaling pathways.

Main Methods:

Utilized the established in vitro transcription and translation (IVTNT) system.
Analyzed protein phosphorylation of cell cycle checkpoint components, including Chk1, Rad17, and ATM.

Main Results:

The IVTNT system successfully induced phosphorylation of ATR/ATM substrates like Chk1, Rad17, and ATM.
These phosphorylation events closely resembled those observed in cells treated with DNA damaging agents.
Demonstrated the capability of the IVTNT system to mimic key aspects of DNA damage response.

Conclusions:

The IVTNT system is a valuable novel tool for dissecting cell cycle checkpoint activation mechanisms.
This in vitro system facilitates the study of DNA damage response pathways in a controlled environment.
Further research using IVTNT can elucidate the precise molecular mechanisms of cell cycle checkpoint activation in vivo.