High-throughput bead-based identification of structure-switching aptamer beacons.

Area of Science:

• Biotechnology
• Molecular Biology
• Analytical Chemistry

Background:

• Aptamers are crucial for detecting small molecules.
• Developing specific aptamer beacons is often time-consuming.
• Structure-switching DNA aptamers offer unique detection mechanisms.

Purpose of the Study:

• To introduce a novel platform for identifying structure-switching DNA beacon aptamers.
• To streamline the selection and development process for aptamer beacons.
• To validate the platform's efficacy in isolating specific aptamers.

Main Methods:

• Utilizing a DNA library designed for fluorescence signaling upon binding.
• Employing clonal amplification onto microbeads.
• Implementing stringent fluorescence-assisted sorting for aptamer selection.
• Enriching DNA libraries with three-way junctions.

Main Results:

• Successfully isolated known and novel anti-steroid aptamers.
• Achieved aptamer retrieval in only three rounds of selection.
• Demonstrated that isolated aptamers required no further optimization.
• Validated the platform's efficiency and speed in beacon development.

Conclusions:

• The described platform significantly accelerates the development of DNA aptamer beacons.
• Fluorescence-assisted sorting is an effective method for selecting structure-switching aptamers.
• This approach simplifies aptamer beacon discovery for small molecule detection.