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Aptamer-Based Target Detection Facilitated by a 3-Stage G-Quadruplex Isothermal Exponential Amplification Reaction
Published on: October 6, 2022
A sol-gel-based microfluidics system enhances the efficiency of RNA aptamer selection
Ji-Young Ahn1, Minjoung Jo, Pooja Dua
1Department of Molecular Biology and Genetics, Cornell University , Ithaca, New York.
Oligonucleotides
|March 19, 2011
Summary
This study introduces a microfluidic chip for faster aptamer selection, significantly reducing cycles needed for high-affinity RNA aptamers against target proteins. This method enhances efficiency and scalability for diagnostics and therapeutics.
Area of Science:
- Biotechnology
- Molecular Biology
- Analytical Chemistry
Background:
- Aptamers (RNA and DNA) offer high specificity and affinity for target molecules, crucial for diagnostics and therapeutics.
- Systematic Evolution of Ligands by Exponential Enrichment (SELEX) is a common method for aptamer discovery, but often requires numerous selection and amplification cycles.
- Previous work demonstrated efficient aptamer binding and elution using a microfluidic chip with sol-gel embedded proteins.
Purpose of the Study:
- To evaluate the efficacy of a microfluidic chip in improving the selection efficiency of RNA aptamers against TATA-binding protein.
- To determine if the microfluidic chip-based SELEX can reduce the number of selection cycles required for high-affinity aptamer generation.
- To assess the scalability and potential for high-throughput applications of the microfluidic chip SELEX method.
Main Methods:
- Utilized a microfluidic chip containing sol-gel binding droplets with embedded target proteins for SELEX.
- Performed SELEX experiments targeting TATA-binding protein using the microfluidic chip.
- Compared the efficiency and aptamer sequences obtained with conventional filter-binding SELEX.
- Demonstrated the use of sol-gel embedded protein arrays as a high-throughput assay for aptamer binding affinity quantification.
Main Results:
- The microfluidic chip SELEX significantly enhanced selection efficiency for RNA aptamers against TATA-binding protein, reducing required cycles by approximately 80%.
- Identified aptamers were often identical or homologous to those previously isolated via conventional SELEX, validating the chip's effectiveness.
- The microfluidic chip SELEX approach is scalable and amenable to multiplexed target selection using sol-gel microarrays.
- Sol-gel embedded protein arrays proved effective for high-throughput quantification of aptamer binding affinities.
Conclusions:
- Microfluidic chip-based SELEX dramatically improves the efficiency of aptamer selection, reducing the time and resources needed.
- This technology offers a scalable and high-throughput platform for aptamer discovery and characterization.
- The findings have significant implications for advancing aptamer-based diagnostics and therapeutics.
