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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...
Homologous Recombination02:31

Homologous Recombination

The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
Homologous Recombination02:31

Homologous Recombination

The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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

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Related Experiment Video

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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

Optimality in DNA repair.

Morgiane Richard1, Matthew Fryett, Samantha Miller

  • 1Institute of Complex Systems and Mathematical Biology, King's College, University of Aberdeen, Aberdeen, UK.

Journal of Theoretical Biology
|September 28, 2011
PubMed
Summary
This summary is machine-generated.

Cells possess DNA repair enzymes, but too many can cause DNA breaks. This study introduces a mathematical model showing an optimal enzyme level balances efficient DNA repair with minimizing cell death risk. Keywords: DNA repair, cell death, mathematical model.

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Visualizing Single-Stranded DNA Foci in the G1 Phase of the Cell Cycle
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Area of Science:

  • Molecular Biology
  • Biophysics
  • Systems Biology

Background:

  • DNA damage is a constant threat to cellular integrity.
  • Organisms employ sophisticated DNA repair mechanisms.
  • DNA repair processes can paradoxically lead to DNA breaks and cell death.

Purpose of the Study:

  • To develop a mathematical theory for DNA damage and repair, particularly when lesions occur in bursts.
  • To identify an optimal level of DNA repair enzymes for cellular response.
  • To understand the trade-off between repair speed and the risk of double-stranded breaks.

Main Methods:

  • Mathematical modeling of DNA damage and repair dynamics.
  • Analytical derivation of optimal enzyme levels.
  • Stochastic simulations to validate model predictions.
  • Comparison of theoretical predictions with existing biological data.

Main Results:

  • A mathematical model was developed for burst-like DNA lesion occurrence.
  • An optimal concentration of repair enzymes was identified.
  • This optimum balances rapid repair with a reduced probability of inducing double-stranded breaks.

Conclusions:

  • The study provides a theoretical framework for understanding DNA repair enzyme dynamics.
  • An optimal enzyme level exists, crucial for cellular survival under DNA damage stress.
  • Findings offer insights into the evolutionary strategies cells use to manage DNA integrity.