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Related Concept Videos

The Cell Cycle Control System01:28

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 System02:11

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 System02:11

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...
Negative Regulator Molecules01:23

Negative Regulator Molecules

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.
Molecular Factors Affecting Cell Division01:27

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...
DNA Damage Can Stall the Cell Cycle02:36

DNA Damage Can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...

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Related Experiment Video

Updated: Jun 22, 2026

Detection of DNA Breaks in Dividing Human Cells by Neutral Comet Assay
05:55

Detection of DNA Breaks in Dividing Human Cells by Neutral Comet Assay

Published on: August 23, 2024

Chking and executing cell division to prevent genomic instability.

Sirisha Peddibhotla1, Jeffrey M Rosen

  • 1Interdepartmental Program in Cell and Molecular Biology, Baylor College of Medicine, Houston, TX 77030, USA.

Cell Cycle (Georgetown, Tex.)
|July 3, 2009
PubMed
Summary
This summary is machine-generated.

Checkpoint Kinase 1 (Chk1) is crucial for accurate cell division, preventing errors like chromosome mis-segregation and genomic instability. Its absence disrupts mitosis and cytokinesis, leading to failed cell division.

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Eukaryotic cell division ensures accurate chromosome and cytoplasmic segregation.
  • Defects in genome maintenance, including cell cycle checkpoints and DNA repair, can lead to chromosomal imbalances.
  • Checkpoint Kinase 1 (Chk1) is a key DNA damage checkpoint effector in mammals.

Purpose of the Study:

  • To investigate the role of Chk1 in chromosome segregation and cytokinesis.
  • To determine the consequences of Chk1 deficiency on mitotic progression and genomic stability.
  • To examine the impact of Chk1 on the localization of Aurora B kinase during cell division.

Main Methods:

  • Studied Chk1 deficiency in various mammalian cell lines.
  • Utilized a mouse model to assess Chk1's role in vivo.
  • Analyzed chromosome alignment, segregation, and cytokinesis.
  • Investigated the localization of Aurora B kinase during mitosis and cytokinesis.

Main Results:

  • Chk1 deficiency in mitotic cells caused chromosome mis-alignment, lagging chromosomes, and mis-segregation.
  • Abrogation of Chk1 led to cytokinetic regression and binucleation.
  • Chk1 deficiency resulted in aberrant localization of Aurora B kinase during mitosis and cytokinesis.

Conclusions:

  • Chk1 is essential for proper chromosome segregation and completion of cytokinesis.
  • Inappropriate regulation of Chk1 levels promotes genomic instability by causing cell division failures.
  • Chk1 plays a critical role in maintaining genome integrity during cell division.