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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...

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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.
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The cell cycle refers to the sequence of events occurring throughout a typical cell’s life. In eukaryotic cells, the somatic cell cycle has two stages: the interphase and the mitotic phase. During interphase, the cell grows, performs its basic metabolic functions, copies its DNA, and prepares for mitotic cell division. Then, during mitosis and cytokinesis, the cell divides its nuclear and cytoplasmic materials, respectively. This generates two daughter cells that are identical to the...

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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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Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...

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Related Experiment Video

Updated: Aug 9, 2025

Analysis of Cell Cycle Position in Mammalian Cells

Analysis of Cell Cycle Position in Mammalian Cells

Published on: January 21, 2012

Basic Methods of Cell Cycle Analysis.

Anna Ligasová¹, Ivo Frydrych¹, Karel Koberna¹

¹Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacký University in Olomouc, Hněvotínská 5, 779 00 Olomouc, Czech Republic.

International Journal of Molecular Sciences

|February 25, 2023

Summary

This review guides readers through methods for determining cell cycle phases and their durations. Understanding cell cycle phase length is crucial for studying cellular growth and division, including pathological conditions.

Keywords:

BrdU DNA labeling EdU cell cycle labeled nucleosides markers of cell cycle phases time lapse microscopy

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Last Updated: Aug 9, 2025

Analysis of Cell Cycle Position in Mammalian Cells

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Published on: January 21, 2012

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Published on: August 16, 2015

Area of Science:

Cell Biology
Molecular Biology

Background:

The cell cycle encompasses cellular growth and preparation for division.
Cell cycle phase duration is a key characteristic of cell life.
Cell cycle progression is regulated by internal and external factors, impacting cell function and disease.

Purpose of the Study:

To review and guide readers through fundamental methods for determining cell cycle phases.
To provide an overview of techniques for estimating the length of distinct cell cycle phases.
To focus on the effectiveness and reproducibility of these cell cycle analysis methods.

Main Methods:

Flow cytometry for DNA content analysis.
Radiolabeling and detection methods.
Microscopy-based techniques for cell cycle analysis.

Main Results:

Various methods exist for cell cycle phase determination.
The choice of method impacts the accuracy and reproducibility of results.
Understanding cell cycle kinetics is vital for research and diagnostics.

Conclusions:

Accurate determination of cell cycle phase duration is essential for biological research.
The reviewed methods offer different advantages for analyzing cell cycle progression.
Further research can refine these techniques for improved insights into cell division and disease states.