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Related Concept Videos

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...
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...
Nucleotide Excision Repair01:38

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Nucleotide Excision Repair01:08

Nucleotide Excision Repair

Overview
Nucleotide Excision Repair01:08

Nucleotide Excision Repair

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Cancer-Critical Genes II: Tumor Suppressor Genes01:05

Cancer-Critical Genes II: Tumor Suppressor Genes

Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...

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Related Experiment Video

Updated: Jun 20, 2026

Measuring DNA Damage and Repair in Mouse Splenocytes After Chronic In Vivo Exposure to Very Low Doses of Beta- and Gamma-Radiation
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Measuring DNA Damage and Repair in Mouse Splenocytes After Chronic In Vivo Exposure to Very Low Doses of Beta- and Gamma-Radiation

Published on: July 3, 2015

Chk2 protects against radiation-induced genomic instability.

Ann MacLaren1, Daniela Slavin, Clare H McGowan

  • 1Department of Molecular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.

Radiation Research
|September 24, 2009
PubMed
Summary

Checkpoint kinase 2 (Chk2) deficiency confers resistance to DNA double-strand breaks but increases sensitivity to UV radiation. Chk2 maintains genome integrity after irradiation, impacting its potential as a cancer therapy target.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Checkpoint kinase 2 (Chk2) is activated by ionizing radiation and involved in p53-dependent apoptosis.
  • The precise role of Chk2 in maintaining genomic stability remains unclear.
  • Understanding Chk2's function is crucial for cancer therapy development.

Purpose of the Study:

  • To investigate the role of Chk2 in genomic stability following DNA damage.
  • To analyze the sensitivity of Chk2-deficient cells to various DNA-damaging agents.
  • To explore the implications of Chk2's function for cancer treatment strategies.

Main Methods:

  • Sensitivity assays of Chk2-deficient murine and human cells to DNA-damaging agents.
  • In vitro screening to assess genomic instability, specifically gene amplification rates.
  • Comparative analysis of Chk2-deficient, p53-compromised, and double-deficient cells.

Main Results:

  • Chk2 deficiency confers resistance to double-strand break-inducing agents but increased sensitivity to UV radiation.
  • Elevated gene amplification rates were observed in Chk2-deficient cells post-irradiation, similar to p53-compromised cells.
  • Disrupting both Chk2 and p53 resulted in synergistic increases in genomic instability, highlighting non-redundant roles.

Conclusions:

  • Chk2 plays a critical role in maintaining genome integrity after radiation-induced DNA damage.
  • Chk2 deficiency leads to increased genomic instability, particularly gene amplification.
  • These findings have significant implications for the therapeutic use of Chk2 inhibitors in cancer treatment.