An Electroanalytical Approach for Advancing Cancer Diagnosis and Therapy by Tracking Globally DNA G-Quadruplex...

Area of Science:

• Biochemistry
• Analytical Chemistry
• Molecular Biology

Background:

• G-quadruplex (G4) motifs are noncanonical DNA structures with emerging roles in cancer.
• Accurate quantification of G4 structures in genomic DNA is challenging.
• G4 motifs are implicated in gene regulation and drug interactions.

Purpose of the Study:

• To develop and validate the first electroanalytical methodology for determining global G-quadruplex levels in DNA.
• To establish a rapid and sensitive assay for G4 motif detection.
• To explore the application of this methodology in cancer cell genomic DNA analysis.

Main Methods:

• Development of a competitive immunoassay utilizing magnetic microcarriers.
• Employing a synthetic DNA sequence with a G4 motif and a specific recombinant antibody.
• Enzymatic labeling with HRP-conjugated secondary antibody and amperometric detection.
• Optimization of bioassay format and experimental conditions.

Main Results:

• A novel electroanalytical methodology for G4 motif determination was established.
• The assay allows quantification of synthetic G4 sequences at low nM levels within 10 minutes.
• Successful application to genomic DNA from cancer cells, demonstrating accurate G4 content determination.

Conclusions:

• The developed methodology provides a groundbreaking tool for analyzing G4 structures in genomic DNA.
• This technique has significant potential for cancer diagnostics and precision therapy.
• It can aid in understanding gene silencing and interactions with G4-targeting oncotherapeutics.