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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...

Cell Signaling Feedback Loops

Cell Signaling Feedback Loops

Positive and negative feedback loops are crucial for regulating biological signaling systems. These feedback loops are processes that connect output signals to their inputs.
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Molecular Factors Affecting Cell Division

Molecular Factors Affecting Cell Division

Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...

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: Jul 14, 2026

Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols

Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols

Published on: June 6, 2017

Irreversible cell-cycle transitions are due to systems-level feedback.

Bela Novak¹, John J Tyson, Bela Gyorffy

¹Oxford Centre for Integrative Systems Biology, University of Oxford, South Parks Road, Oxford, OX1 3QU, UK. bela.novak@bioch.ox.ac.uk

Nature Cell Biology

|July 3, 2007

Summary

Cell cycle transitions are irreversible due to feedback signals in reaction networks, not just protein degradation. This systems-level perspective explains molecular control system irreversibility.

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Related Experiment Videos

Last Updated: Jul 14, 2026

Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols

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Published on: June 6, 2017

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

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Published on: August 16, 2015

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

Area of Science:

Molecular biology
Systems biology
Biochemistry

Background:

Cell-cycle progression relies on precise molecular events.
Irreversibility is crucial for cell cycle fidelity.
Current models often focus on individual molecular components.

Purpose of the Study:

To challenge the conventional view of irreversibility in cell cycle control.
To propose a systems-level explanation for irreversibility in molecular control systems.
To highlight the role of feedback in driving irreversible transitions.

Main Methods:

Theoretical analysis of molecular reaction networks.
Review and synthesis of existing experimental data.
Conceptual modeling of feedback mechanisms.

Main Results:

Irreversibility arises from network-level feedback, not single reactions.
Protein degradation is a consequence, not the sole cause, of irreversibility.
Feedback loops generate robust, unidirectional progression.

Conclusions:

A systems-level understanding is essential for cell cycle irreversibility.
Feedback signals in reaction networks are the fundamental drivers.
This framework applies to various molecular control systems beyond the cell cycle.