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Overview of DNA Repair

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 Repair

Overview of DNA Repair

DNA Replication

DNA Replication

DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied. After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
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The DNA Replication Fork

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...

The DNA Replication Fork

The DNA Replication Fork

Mismatch Repair

Mismatch Repair

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Related Experiment Video

Updated: Jan 23, 2026

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

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

Published on: February 3, 2022

Replication-Coupled DNA Repair.

¹Vanderbilt University School of Medicine, Nashville, TN 37232, USA.

|June 8, 2019

Summary

This summary is machine-generated.

DNA replication is vital but prone to errors, especially with damaged DNA. Replication-coupled repair mechanisms ensure genome stability, preventing diseases caused by replication failures.

Keywords:

DNA damage DNA replication break-induced replication cancer crosslink repair excision repair fork protection fork reversal mismatch repair replication stress

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Last Updated: Jan 23, 2026

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

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Direct Observation of Enzymes Replicating DNA Using a Single-molecule DNA Stretching Assay

Direct Observation of Enzymes Replicating DNA Using a Single-molecule DNA Stretching Assay

Published on: March 23, 2010

Area of Science:

Molecular Biology
Genetics
Cell Biology

Background:

DNA replication is essential for cell division, involving the replisome copying billions of DNA bases.
Replication fidelity can be compromised by polymerase errors and template DNA damage.
Replication errors and failures lead to mutations, genomic instability, and human diseases.

Purpose of the Study:

To provide a comprehensive overview of replication-coupled repair pathways.
To explain how these pathways address polymerase mistakes and template damage.
To discuss the impact of replication-coupled repair on human health and disease.

Main Methods:

Literature review of replication-coupled repair mechanisms.
Analysis of pathways involved in fixing polymerase errors.
Examination of responses to DNA damage during replication.
Investigation of mechanisms for handling replication fork collapse.

Main Results:

Replication-coupled repair pathways are crucial for maintaining genome integrity.
These pathways correct polymerase errors and repair DNA lesions that impede replication.
Dysfunctional repair mechanisms contribute to various human pathologies.

Conclusions:

Replication-coupled repair is a critical cellular process ensuring high-fidelity DNA replication.
Understanding these pathways offers insights into disease mechanisms and potential therapeutic targets.
Genome maintenance through replication-coupled repair is fundamental for preventing genetic instability and disease.