Using AuNPs-DNA Walker with Fluorophores Detects the Hepatitis Virus Rapidly

Area of Science:

• Biotechnology
• Molecular Diagnostics
• Nanotechnology

Background:

• Viral hepatitis, caused by hepatitis A, B, C, D, and E viruses, is a global health concern leading to liver damage.
• Current detection methods like ELISA and in situ hybridization have limitations, including low sensitivity and high error rates.
• Occult serum infections pose challenges for accurate hepatitis virus diagnosis.

Purpose of the Study:

• To develop a novel, highly sensitive, and specific method for detecting viral DNA/RNA fragments.
• To overcome the limitations of existing hepatitis virus detection techniques.
• To enable convenient and reliable detection and typing of hepatitis viruses.

Main Methods:

• Utilized a gold nanoparticle (AuNP)-DNA walker system for colorimetric and fluorescence-based detection.
• Employed a DNA walker comprising a walking strand, probe sequence, and stem-loop structures with a DNAzyme domain.
• Leveraged Mg2+-induced cleavage of stem-loop structures, leading to DNA walker destabilization and aggregation-induced color change.

Main Results:

• The AuNP-DNA walker method achieved high specificity for target DNA/RNA sequences.
• Detection limits as low as 1 nM were reached, demonstrating enhanced sensitivity.
• The assay produced a visible color change upon target detection and allowed for virus typing via fluorescence.

Conclusions:

• The developed AuNP-DNA walker assay provides a more convenient and reliable platform for hepatitis virus detection.
• This method addresses the sensitivity and accuracy issues associated with traditional diagnostic approaches.
• The innovative technique holds promise for improved diagnosis and management of viral hepatitis infections.