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Enzyme-amplified aequorin-based bioluminometric hybridization assays
E Laios1, P C Ioannou, T K Christopoulos
1Department of Chemistry and Biochemistry, University of Windsor, Ontario, Canada.
Analytical Chemistry
|February 24, 2001
Summary
This study enhanced DNA detection sensitivity using aequorin bioluminescence with enzymatic amplification. The new method significantly boosts signal for improved DNA hybridization assays.
Area of Science:
- Biochemistry
- Molecular Biology
- Assay Development
Background:
- Aequorin-based bioluminometric assays offer sensitive detection but can be limited by signal intensity.
- Enhancing signal-to-noise ratios is crucial for detecting low concentrations of target DNA.
Purpose of the Study:
- To improve the sensitivity of aequorin-based bioluminometric hybridization assays.
- To develop an enzymatic amplification strategy for increased aequorin labeling per DNA hybrid.
Main Methods:
- Hybridization of target DNA with immobilized capture and digoxigenin-labeled detection probes in microtiter wells.
- Enzymatic amplification using horseradish peroxidase to attach multiple digoxigenin moieties.
- Detection of bound aequorin via calcium-triggered bioluminescence.
Main Results:
- The amplified assay detected as low as 20 fmol/L target DNA with a signal-to-background ratio of 2.7.
- A 14-38 fold signal enhancement was observed compared to the non-amplified assay.
- The amplified assay demonstrated an analytical range up to 2600 fmol/L with good reproducibility (CVs 5.5-7.3%).
Conclusions:
- Enzymatic introduction of multiple aequorin labels per DNA hybrid significantly enhances assay sensitivity.
- This amplified bioluminometric hybridization assay is suitable for detecting low-abundance DNA targets.
- The developed method offers a powerful tool for sensitive molecular diagnostics.