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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.
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Non-nuclear Inheritance

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Related Experiment Video

Updated: Jan 22, 2026

In Vitro Nuclear Assembly Using Fractionated Xenopus Egg Extracts

In Vitro Nuclear Assembly Using Fractionated Xenopus Egg Extracts

Published on: September 2, 2008

Assembling nuclear domains: Lessons from DNA repair.

Benjamin Schrank¹, Jean Gautier²

¹Institute for Cancer Genetics, Columbia University Irving Medical Center, New York, NY.

The Journal of Cell Biology

|July 21, 2019

Summary

This summary is machine-generated.

Nuclear domains organize eukaryotic DNA for essential processes like replication and repair. DNA double-strand break (DSB) repair highlights how actin and RNA-binding proteins drive domain formation, offering a model for other genomic functions.

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Last Updated: Jan 22, 2026

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Area of Science:

Cell Biology
Genomics
Molecular Biology

Background:

Eukaryotic nuclei organize functional DNA into specialized nuclear domains.
These domains are crucial for processes like DNA replication, transcription, splicing, and DNA double-strand break (DSB) repair.
The physical forces and molecular mechanisms driving nuclear domain formation are under active investigation.

Purpose of the Study:

To review the formation of nuclear domains, using DNA double-strand break (DSB) repair as a model system.
To explore the roles of actin nucleation, RNA, and RNA-binding proteins in concentrating damaged DNA.
To discuss the potential link between liquid-liquid phase separation and actin nucleation in domain generation.

Main Methods:

This review synthesizes current research on nuclear domain formation.
It focuses on mechanisms observed during DNA double-strand break (DSB) repair.
It discusses the involvement of specific proteins and molecules like actin and RNA-binding proteins.

Main Results:

Actin filament nucleators drive DNA movement and clustering at DSB sites.
RNAs and RNA-binding proteins accumulate at sites of transcription and repair.
DSB repair domains serve as a model for understanding other functional nuclear domains.

Conclusions:

Nuclear domain formation relies on specific forces, including actin nucleation.
RNA and associated proteins play roles in concentrating repair machinery.
Studying DSB repair domains provides insights into the broader organization of the eukaryotic nucleus.