Related Experiment Video
Updated: May 4, 2026
A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants
Published on: February 19, 2016
Detecting Chemically Modified DNA Bases Using Surface Enhanced Raman Spectroscopy
Aoune Barhoumi1, Naomi J Halas2
1Department of Chemistry, Rice University, Houston, TX 77005 (USA).
Abstract:
Post-translational modifications of DNA- changes in the chemical structure of individual bases that occur without changes in the DNA sequence- are known to alter gene expression. They are believed to result in frequently deleterious phenotypic changes, such as cancer. Methylation of adenine, methylation and hydroxymethylation of cytosine, and guanine oxidation are the primary DNA base modifications identified to date. Here we show it is possible to use surface enhanced Raman spectroscopy (SERS) to detect these primary DNA base modifications. SERS detection of modified DNA bases is label-free and requires minimal additional sample preparation, reducing the possibility of additional chemical modifications induced prior to measurement. This approach shows the feasibility of DNA base modification assessment as a potentially routine analysis that may be further developed for clinical diagnostics.
Insights
Surface-enhanced Raman spectroscopy (SERS) can detect primary DNA base modifications, such as methylation and oxidation, without labels. This label-free SERS method offers a feasible approach for routine DNA modification analysis and potential clinical diagnostics.
Area of Science:
- Molecular Biology
- Biochemistry
- Spectroscopy
Background:
- Post-translational modifications of DNA alter gene expression and are linked to diseases like cancer.
- Key DNA base modifications include adenine methylation, cytosine methylation/hydroxymethylation, and guanine oxidation.
Purpose of the Study:
- To investigate the use of Surface-Enhanced Raman Spectroscopy (SERS) for detecting primary DNA base modifications.
- To establish a label-free and minimally invasive method for assessing DNA modifications.
Main Methods:
- Utilized Surface-Enhanced Raman Spectroscopy (SERS) to analyze DNA samples.
- Focused on detecting known primary DNA base modifications: methylation and oxidation.
Main Results:
- Demonstrated the capability of SERS to detect primary DNA base modifications.
- SERS detection was label-free and required minimal sample preparation, avoiding induced chemical changes.
Conclusions:
- SERS is a feasible technique for assessing DNA base modifications.
- This approach has potential for routine analysis and development into clinical diagnostic tools for DNA-related diseases.
More Related Videos
11:44Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
Published on: March 20, 2015
10:43Author Spotlight: Single-Molecule Surface-Enhanced Raman Scattering Measurements Enabled by Plasmonic DNA Origami Nanoantennas
Published on: July 21, 2023