Related Experiment Video

Updated: May 25, 2026

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
10:59

Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage

Published on: August 21, 2021

Balancing repair and tolerance of DNA damage caused by alkylating agents

Dragony Fu1, Jennifer A Calvo, Leona D Samson

  • 1Department of Biological Engineering, Center for Environmental Health Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Nature Reviews. Cancer
|January 13, 2012
PubMed

Insights

Alkylating agents cause DNA damage, but cellular repair pathways like base excision repair (BER) and mismatch repair (MMR) can mitigate this. Balancing these repair pathways is key to effective chemotherapy and reducing toxicity.

Area of Science:

  • Molecular Biology
  • Genetics
  • Pharmacology

Background:

  • Alkylating agents are crucial chemotherapy drugs.
  • They induce cytotoxic and mutagenic DNA damage.
  • Cellular repair mechanisms counteract this damage.

Purpose of the Study:

  • To investigate the role of DNA repair pathways in response to alkylating agents.
  • To understand how pathway balance affects chemotherapy outcomes.
  • To explore factors influencing individual variability in drug toxicity.

Main Methods:

  • Review of cellular DNA repair pathways (direct reversal, BER, MMR).
  • Analysis of the impact of pathway activity on cell death and mutation.
  • Discussion of genetic and epigenetic modulation of drug response.

Main Results:

  • Proper balance within and between DNA repair pathways is essential.
  • Imbalances can lead to unfavorable responses to alkylating agents.
  • Individual responses vary due to genetic and epigenetic factors.

Conclusions:

  • Cellular defense against alkylating agents relies on a delicate balance of DNA repair.
  • Modulating these pathways could optimize chemotherapy efficacy.
  • Understanding individual variability is critical for personalized treatment.

More Related Videos

Assessment of Global DNA Double-Strand End Resection using BrdU-DNA Labeling coupled with Cell Cycle Discrimination Imaging06:44

Assessment of Global DNA Double-Strand End Resection using BrdU-DNA Labeling coupled with Cell Cycle Discrimination Imaging

Published on: April 28, 2021

Visualization of DNA Repair Proteins Interaction by Immunofluorescence07:55

Visualization of DNA Repair Proteins Interaction by Immunofluorescence

Published on: June 26, 2020

Related Concept Videos

Overview of DNA Repair02:25

Overview of DNA Repair

In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...
Overview of DNA Repair02:25

Overview of DNA Repair

In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...
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...
Base Excision Repair01:54

Base Excision Repair

One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
The first step of...
Base Excision Repair01:54

Base Excision Repair

One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
The first step of...