Barcoded DNA nanostructures for the multiplexed profiling of subcellular protein distribution

Area of Science:

• Biotechnology
• Molecular Biology
• Nanotechnology

Background:

• High-throughput protein profiling is challenging despite advances in DNA sequencing.
• Existing methods lack the sensitivity and multiplexing capability for comprehensive cellular analysis.

Purpose of the Study:

• To develop a novel barcoding approach for high-throughput multiplexed protein profiling in whole cells.
• To enhance signal detection and enable subcellular localization analysis.
• To apply this method for accurate classification of rare patient samples, such as in breast cancer.

Main Methods:

• Utilized tetrahedral DNA nanostructures and antibody-conjugated DNA sequences for in situ hybridization.
• Employed nanostructure-assisted ligation with nanoparticle-bound DNA sequences for signal amplification and subcellular localization.
• Integrated the barcoding approach onto a microfluidic device for rare sample analysis.

Main Results:

• Achieved over 100-fold signal enhancement compared to linear DNA barcoding.
• Demonstrated accurate classification of breast cancer molecular subtypes using rare patient samples.
• Identified subcellular spatial markers associated with disease aggressiveness.

Conclusions:

• The DNA nanostructure barcoding approach offers a powerful tool for high-throughput protein profiling with enhanced sensitivity.
• This method facilitates precise molecular subtyping and identification of prognostic markers in challenging clinical samples.
• The technology holds significant potential for advancing cancer diagnostics and personalized medicine.