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Efficient discovery of antibody binding pairs using a photobleaching strategy for bead encoding
Shira Roth1,2,3, Tom Ferrante1, David R Walt1,2,3
1Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.
Lab on a Chip
|July 31, 2024
Summary
A novel photobleaching method expands dye-encoded bead assays by creating more bead populations from a single color. This cost-effective system simplifies antibody screening for immunoassays and multiplexed diagnostics.
Area of Science:
- Biotechnology
- Analytical Chemistry
- Materials Science
Background:
- Dye-encoded bead-based assays are crucial for diagnostics and require multiple bead populations for multiplexing.
- Existing methods for creating diverse bead populations are often costly, restrictive, or require extensive optimization.
- There is a need for accessible and scalable strategies to generate a wider array of encoded bead populations.
Purpose of the Study:
- To develop a simple, safe, and cost-effective bench-top system for generating expanded bead populations using photobleaching.
- To demonstrate the utility of photobleached beads in antibody cross-testing for immunoassay development.
- To provide a rapid alternative for initial antibody pair screening in ultrasensitive assays.
Main Methods:
- Commercially available dye-encoded magnetic beads were photobleached for varying durations using a high-power LED system with a light concentrator and heat sink.
- Beads were photobleached in solution with constant mixing to ensure homogeneous treatment.
- Photobleached beads were conjugated with capture antibodies for simultaneous testing of multiple binding pairs in an assay format.
Main Results:
- Photobleaching a single dye color generated three times the number of differentiable bead populations detectable by flow cytometry.
- The method was successfully applied to antibody cross-testing, enabling simultaneous evaluation of numerous binding pairs.
- The assay accurately predicted antibody pair performance for ultrasensitive Simoa assays, reducing the number of pairs needing extensive testing by at least two-thirds.
Conclusions:
- Photobleaching offers a scalable and cost-effective strategy to significantly increase the number of distinguishable bead populations from a single dye color.
- This technique provides a rapid and efficient method for initial antibody pair screening in immunoassay development.
- The photobleaching system has broad applicability for multiplexing and modifying other solution-based particles.
