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Related Concept Videos

Overview of DNA Repair02:25

Overview of DNA Repair

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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.
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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
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Related Experiment Video

Updated: Feb 11, 2026

Visualizing DNA Damage Repair Proteins in Patient-Derived Ovarian Cancer Organoids via Immunofluorescence Assays
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A Review on DNA Repair Inhibition by PARP Inhibitors in Cancer Therapy.

Ashish P Shah1, Chhagan N Patel2, Dipen K Sureja1

  • 1Department of Pharmacy, Sumandeep Vidyapeeth University, Vadodara, India.

Folia Medica
|April 19, 2018
PubMed
Summary

Poly(ADP-ribose) polymerases (PARP) are key enzymes in DNA repair, crucial for cancer cell survival. PARP inhibitors offer a promising cancer therapy strategy by blocking DNA repair and inducing cancer cell death.

Keywords:
DNA damage repairPARP inhibitorsPoly(ADP-ribose) polymerasescancer

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Area of Science:

  • Molecular Biology
  • Oncology
  • Drug Discovery

Background:

  • DNA repair mechanisms protect cells from damage, but also confer drug resistance in cancer.
  • Poly(ADP-ribose) polymerases (PARP) are critical enzymes in DNA damage repair pathways.
  • Tumor cells exploit PARP and defective homologous recombination (HR) for survival.

Purpose of the Study:

  • To review the role of PARP in DNA repair.
  • To discuss the mechanism and efficacy of PARP inhibitors in cancer therapy.
  • To explore the chemistry of available PARP inhibitors.

Main Methods:

  • Literature review of scientific articles and clinical data.
  • Analysis of the role of PARP enzymes in DNA repair pathways.
  • Examination of the therapeutic potential of PARP inhibitors.

Main Results:

  • PARP enzymes are central to DNA repair, particularly in tumors with defective homologous recombination.
  • PARP inhibitors induce apoptosis in cancer cells by blocking DNA repair.
  • Clinical data indicates PARP inhibitors are effective beyond BRCA mutations, including in HR-deficient tumors.

Conclusions:

  • PARP inhibitors represent a significant advancement in cancer treatment, especially for HR-dysfunctional tumors.
  • Targeting PARP offers a viable strategy to overcome drug resistance and improve patient outcomes.
  • Further investigation into PARP inhibitors holds great promise for future cancer therapies.