HOGG1-assisted DNA methylation analysis via a sensitive lanthanide labelling strategy

Area of Science:

• Biochemistry
• Analytical Chemistry
• Molecular Biology

Background:

• DNA methylation is crucial for disease diagnosis and treatment.
• Current DNA methylation assays rely on complex and time-consuming amplification techniques.

Purpose of the Study:

• To develop a sensitive, rapid, and accurate method for DNA methylation analysis.
• To overcome the limitations of existing amplification-based DNA methylation assays.

Main Methods:

• Utilized a lanthanide-labeled ICP-MS technique.
• Exploited the specificity of Human 8-oxoGuanine DNA Glycosylase (hOGG1) for 8-oxo-G/5mC base pairs.
• Avoided nucleic acid amplification procedures.

Main Results:

• Achieved a low limit of detection of 84 pM.
• Successfully discriminated methylation levels as low as 0.1%.
• Validated in human serum samples with high recovery (96.7%-105%) and low RSD (3.0%-3.5%).

Conclusions:

• The proposed ICP-MS method offers a sensitive, time-saving, and accurate alternative for DNA methylation analysis.
• Demonstrated potential for quantitative analysis in clinical and biological samples.
• Reduced the probability of false positives compared to amplification-based methods.