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DNA aptamers that bind to PrP(C) and not PrP(Sc) show sequence and structure specificity.
Kaori Takemura1, Ping Wang, Ina Vorberg
1Department of Veterinary Preventive Medicine, Ohio Agricultural Research and Development Center, Ohio State University, Wooster 44691, USA.
Experimental Biology and Medicine (Maywood, N.J.)
|February 1, 2006
Summary
Researchers developed DNA aptamers to detect cellular prion protein (PrP(C)). These aptamers show high specificity and affinity, offering potential for diagnostic tools and sample enrichment in prion disease research.
Area of Science:
- Biochemistry and Molecular Biology
- Biotechnology and Bioengineering
- Neuroscience and Neurology
Background:
- Cellular prion protein (PrP(C)) is crucial in neurodegenerative diseases.
- Developing specific detection tools for PrP(C) is essential for diagnostics.
- Systematic Evolution of Ligands by Exponential (SELEX) is a powerful aptamer selection method.
Purpose of the Study:
- To select and characterize DNA aptamers that specifically bind to recombinant human cellular prion protein (rhuPrP(C)).
- To evaluate the binding affinity and specificity of selected aptamers.
- To explore the potential applications of these aptamers in biological samples and diagnostic assays.
Main Methods:
- SELEX enrichment procedure using lateral flow chromatography with immobilized rhuPrP(C)23-231.
- Selection of candidate aptamers after six iterations.
- Evaluation of aptamer binding affinity and specificity using various PrP(C) constructs and cell lines.
Main Results:
- Thirteen distinct DNA aptamers were identified, with three dominant sequences.
- Selected aptamers demonstrated binding to rhuPrP(C)23-231 at concentrations ranging from 10(-6) M to 10(-8) M.
- Aptamers showed specific binding to mammalian PrP(C) from various sources and cell lines, but not to proteinase K-digested scrapie-infected cells or PrP-null cells.
Conclusions:
- DNA aptamers with high specificity for rhuPrP(C) and mammalian PrP(C) were successfully enriched and selected.
- Binding affinity is dependent on aptamer sequence and structure.
- These aptamers hold promise for PrP(C) enrichment in biological samples and as diagnostic tools in assay systems.