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Updated: May 24, 2026
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On-site DNA Detection of Trypanosomatid Parasites and Nosema ceranae Through Alkaline Lysis Coupled to RPA/CRISPR/Cas12a System
Published on: July 18, 2025
Site-specific DNA-antibody conjugates for specific and sensitive immuno-PCR
Stephanie A Kazane1, Devin Sok, Edward H Cho
1Department of Chemistry, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
Summary
We developed site-specific antibody-oligonucleotide conjugates for enhanced diagnostics. These "oligobodies" improve sensitivity and specificity in detecting rare cancer cells, outperforming traditional methods.
Area of Science:
- Bioconjugation Chemistry
- Molecular Diagnostics
- Immunotechnology
Background:
- Antibody conjugates are crucial for diagnostics and imaging but often suffer from reduced sensitivity and specificity due to non-specific labeling.
- Current labeling methods can lead to suboptimal performance in detecting low-abundance targets.
Purpose of the Study:
- To develop a site-specific conjugation methodology for creating antibody-oligonucleotide conjugates.
- To evaluate the diagnostic performance of these novel conjugates in detecting cancer cells.
Main Methods:
- Genetically encoding an unnatural amino acid with orthogonal reactivity into antibodies.
- Site-specific conjugation of oligonucleotides to these modified antibodies, creating "oligobodies".
- Utilizing oligobodies in immuno-PCR assays for sensitive and specific cell detection.
Main Results:
- Oligobodies demonstrated superior sensitivity and specificity compared to non-specifically coupled antibody fragments in detecting Her2(+) cells.
- The developed method enabled the detection of extremely rare Her2(+) cells within a complex cellular environment.
- Successful creation of designed antibody-oligonucleotide conjugates with enhanced properties.
Conclusions:
- Site-specific conjugation of oligonucleotides to antibodies via unnatural amino acids offers a significant improvement over traditional methods.
- These novel oligobody reagents provide enhanced sensitivity and specificity for diagnostic applications, particularly for detecting rare cells.
- The oligobody platform opens avenues for advanced diagnostics and other unique biotechnological applications.
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