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Related Concept Videos

Genome Copying Errors02:46

Genome Copying Errors

DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
The DNA Replication Fork01:02

The DNA Replication Fork

An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...
The DNA Replication Fork01:02

The DNA Replication Fork

An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication forks, one in...
Mismatch Repair01:36

Mismatch Repair

Overview
Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
Mismatch Repair01:36

Mismatch Repair

Overview

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Detection of Post-Replicative Gaps Accumulation and Repair in Human Cells Using the DNA Fiber Assay
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Detection of Post-Replicative Gaps Accumulation and Repair in Human Cells Using the DNA Fiber Assay

Published on: February 3, 2022

Defects and DNA replication.

Michel G Gauthier1, John Herrick, John Bechhoefer

  • 1Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada, V5A 1S6.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

We developed a model for DNA replication kinetics that reveals how DNA damage affects replication. It shows a switch between local and global defect impacts, explaining replication rate variations.

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Last Updated: Jun 8, 2026

Detection of Post-Replicative Gaps Accumulation and Repair in Human Cells Using the DNA Fiber Assay
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Visualization of DNA Replication in the Vertebrate Model System DT40 using the DNA Fiber Technique
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17:14

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genetics

Background:

  • DNA replication is crucial for cell division and genome stability.
  • DNA damage can impede replication, leading to mutations and genomic instability.
  • Understanding how replication forks navigate DNA damage is essential.

Purpose of the Study:

  • To develop a theoretical model for DNA replication kinetics in the presence of DNA damage.
  • To investigate the impact of DNA damage on replication fork progression and origin firing.
  • To identify different regimes of replication based on defect density and their influence.

Main Methods:

  • A rate-equation formalism was employed to model DNA replication kinetics.
  • The model considers the effects of DNA damage-induced defects on replication.
  • Analysis focused on identifying distinct regimes of replication based on defect influence.

Main Results:

  • A crossover between two distinct replication regimes was identified: normal and initiation-limited.
  • In the normal regime, DNA damage defects have a local influence on replication.
  • In the initiation-limited regime, defects globally impact replication, governed by origin initiation rates.

Conclusions:

  • The model explains how DNA damage can alter DNA replication kinetics.
  • It highlights a transition from local to global defect influence as damage increases.
  • The findings provide a framework for understanding correlations between interorigin distance and replication rate.