Related Experiment Video
Updated: Jan 30, 2026

Preparation of DNA-crosslinked Polyacrylamide Hydrogels
Published on: August 27, 2014
Acetaldehyde forms covalent GG intrastrand crosslinks in DNA
Yuina Sonohara1, Junpei Yamamoto1, Kosuke Tohashi1
1Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan.
Researchers identified a new DNA lesion caused by acetaldehyde, an environmental mutagen. This GG intrastrand crosslink may explain acetaldehyde's toxicity and mutagenicity in DNA.
Area of Science:
- Molecular biology
- Toxicology
- Cancer research
Background:
- Carcinogens can create DNA lesions, contributing to cancer and aging.
- Acetaldehyde is an environmental mutagen found in alcohol, tobacco, and food.
- The specific DNA lesions formed by acetaldehyde have not been previously identified.
Purpose of the Study:
- To identify the chemical structure of DNA lesions formed by acetaldehyde.
- To understand the mechanism behind acetaldehyde's mutagenicity and toxicity.
Main Methods:
- Chemical analysis of DNA exposed to acetaldehyde.
- Investigation of DNA lesion formation at the nucleotide level.
Main Results:
- An aldehyde-induced DNA lesion, specifically an intrastrand crosslink between adjacent guanine bases (GG intrastrand crosslink), was identified.
- This GG intrastrand crosslink exists in equilibrium and was not detected in previous studies.
- The lesion was specific to adjacent guanines, not occurring with single guanines or other nucleotide combinations.
Conclusions:
- The newly identified GG intrastrand crosslinks are likely responsible for the mutagenic and toxic effects of acetaldehyde on DNA.
- This finding provides a molecular explanation for the role of acetaldehyde in cancer and aging.
More Related Videos
10:12Author Spotlight: Quantitative Detection of DNA Protein Crosslinks and Their Post-Translational Modifications
Published on: April 21, 2023
09:33Formation of Covalent DNA Adducts by Enzymatically Activated Carcinogens and Drugs In Vitro and Their Determination by 32P-postlabeling
Published on: March 20, 2018
Related Concept Videos
Covalent Bonds
Covalent Bonds
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
Network Covalent Solids
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Covalently Linked Protein Regulators
These groups modify specific amino acids in a protein....
Covalently Linked Protein Regulators
Covalent Bonding and Lewis Structures