Tyramide-conjugated DNA barcodes enable signal amplification for multiparametric CODEX imaging.

Area of Science:

• Biotechnology
• Molecular Biology
• Immunohistochemistry

Background:

• Multiparametric imaging techniques like CODEX enable simultaneous measurement of numerous biomarkers for detailed cell microenvironment characterization.
• Current commercial CODEX systems require primary antibodies conjugated to DNA barcodes, which can lead to antibody dysfunction and costly, time-consuming panel development.

Purpose of the Study:

• To develop an improved method for multiplex imaging that overcomes limitations of primary antibody-DNA conjugation in CODEX.
• To enable rapid development of custom antibody panels for CODEX by utilizing tyramide-conjugated DNA barcodes.

Main Methods:

• Developed novel tyramide-conjugated DNA barcodes compatible with primary antibodies via peroxidase-conjugated secondary antibodies.
• Implemented automated tissue staining and in situ hybridization imaging on the CODEX platform.
• Combined tyramide-based approach with commercially available barcode-conjugated primary antibodies for rapid panel creation.

Main Results:

• The novel tyramide-based DNA barcoding approach enables signal amplification and imaging without direct primary antibody conjugation.
• This method significantly reduces the time and cost associated with developing working antibody panels for CODEX.
• Successful integration with automated staining and in situ hybridization imaging was demonstrated.

Conclusions:

• The developed tyramide-conjugated DNA barcode system offers a more efficient and cost-effective solution for multiplex protein imaging using CODEX.
• This approach facilitates rapid antibody panel development and enhances the ability to study complex cellular microenvironments.
• Future applications include imaging challenging biomarkers and immune infiltrates in tumors.