Simultaneous detection of attomolar pathogen DNAs by Bio-MassCode mass spectrometry

Area of Science:

• Biotechnology
• Analytical Chemistry
• Molecular Diagnostics

Background:

• Accurate and sensitive detection of pathogen DNA is crucial for disease diagnosis and public health.
• Existing methods may require amplification or lack simultaneous multi-pathogen detection capabilities.

Purpose of the Study:

• To develop a novel, highly sensitive assay for simultaneous DNA analysis of multiple pathogens.
• To utilize a unique probe system for mass spectrometry-based detection.

Main Methods:

• Development of a Bio-MassCode probe involving self-assembled disulfide reporter masses on oligonucleotide-modified gold nanoparticles.
• Application of Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI TOF MS) for analysis.
• Direct detection in homogenous solution without amplification.

Main Results:

• Simultaneous detection of DNA for Human Immunodeficiency Virus (HIV), Hepatitis B Virus (HBV), Hepatitis C Virus (HCV), and Treponema pallidum (TP).
• Achieved extraordinary sensitivity in the low attomolar (10(-18) M) range.
• Demonstrated the efficacy of the self-assembled reporter mass system.

Conclusions:

• The Bio-MassCode probe coupled with MALDI TOF MS offers a powerful and sensitive platform for simultaneous pathogen DNA detection.
• This method presents a significant advancement in molecular diagnostics, enabling rapid identification of multiple infectious agents.
• The assay's high sensitivity and lack of amplification requirements offer potential for widespread clinical application.