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Related Concept Videos

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

Overview
Fixing Double-strand Breaks02:04

Fixing Double-strand Breaks

The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
Fixing Double-strand Breaks02:04

Fixing Double-strand Breaks

The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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...

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Related Experiment Video

Updated: May 28, 2026

A Data Integration Workflow to Identify Drug Combinations Targeting Synthetic Lethal Interactions
07:40

A Data Integration Workflow to Identify Drug Combinations Targeting Synthetic Lethal Interactions

Published on: May 27, 2021

DNA repair and synthetic lethality.

Gong-She Guo1, Feng-Mei Zhang, Rui-Jie Gao

  • 1School of Public Health, Shandong University, Jinan 250012, China.

International Journal of Oral Science
|October 21, 2011
PubMed
Summary
This summary is machine-generated.

Targeting DNA repair defects in tumors, especially homologous recombination (HR) deficiency, offers synthetic lethality strategies. Inhibiting poly (ADP-ribose) polymerase (PARP) in HR-defective tumors presents a promising therapeutic approach.

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Last Updated: May 28, 2026

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Published on: March 31, 2022

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Tumors frequently exhibit DNA repair defects, creating vulnerabilities.
  • Homologous recombination (HR) deficiency is a common DNA repair defect in tumors.
  • DNA repair defects suggest potential for synthetic lethality by inhibiting other pathways.

Purpose of the Study:

  • To review strategies for targeting DNA repair pathways in HR-defective tumors.
  • To explore the synthetic lethality approach for cancer therapy.
  • To highlight the vulnerability of HR-defective tumors to specific inhibitors.

Main Methods:

  • Literature review of DNA repair pathways and synthetic lethality.
  • Analysis of poly (ADP-ribose) polymerase (PARP) inhibitors' effects.
  • Examination of targeting DNA metabolic functions in HR-defective cells.

Main Results:

  • HR-defective tumors show heightened sensitivity to DNA-damaging agents.
  • Poly (ADP-ribose) polymerase (PARP) inhibitors induce synthetic lethality in BRCA1/2-defective tumors.
  • Targeting DNA repair offers viable therapeutic strategies for specific tumor types.

Conclusions:

  • Synthetic lethality by targeting DNA repair pathways is a promising strategy for HR-defective tumors.
  • PARP inhibitors represent a key therapeutic class for tumors with HR deficiencies.
  • Further research into DNA repair inhibition can yield novel cancer treatments.