Analogous modified DNA probe and immune competition method-based electrochemical biosensor for RNA modification

Area of Science:

• Biochemistry
• Molecular Biology
• Biosensors

Background:

• N6-methyladenosine (m6A) is a prevalent RNA modification crucial for numerous biological processes.
• Accurate quantification of m6A is essential for understanding its functional roles.

Purpose of the Study:

• To develop a label-free, highly selective electrochemical immunosensor for m6A detection.
• To establish a method for rapid and accurate quantitative detection of m6A in biological samples.

Main Methods:

• An electrochemical immunosensor utilizing anti-m6A antibodies (anti-m6A-Ab) was designed.
• A modified DNA probe (L1) was employed as a signal molecule to compete with m6A-RNA.
• The immunosensor's performance was evaluated for specificity, reproducibility, and sensitivity.

Main Results:

• The immunosensor demonstrated a broad linear range for m6A detection (0.05–200 nM) with a low detection limit (0.016 nM).
• The method showed high specificity and satisfactory reproducibility.
• The assay's effectiveness was confirmed through m6A determination in human cell lines.

Conclusions:

• The developed electrochemical immunosensor provides a simple, sensitive, and specific platform for m6A-RNA detection.
• This tool facilitates further research into the biological functions of m6A.
• The method is robust and suitable for analyzing m6A in complex biological matrices.