Analyte Detection Using Cumulative Tally-Probe Binding
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Solution Overview
Problem
Existing analyte detection technologies face challenges in achieving high sensitivity and specificity, particularly for analytes present at vanishingly small concentrations, and require complex amplification or prolonged observation times to detect them accurately.
Innovation Solution
The use of molecular probes that integrate cumulative repeated binding, where a tally probe transfers labels irreversibly to an integrator probe upon binding to an analyte, allowing for end-point detection through the presence of multiple labels on the integrator probe, enabling improved data acquisition and lower limits of detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional affinity probes are used for analyte detection, then the detection method is simple, but the detection sensitivity and specificity are insufficient for vanishingly small concentrations
Solution Approach 1:
The detection system is segmented into three distinct functional components: a stably-bound probe that binds to the analyte, a transiently-bound probe that transfers labels, and a label itself. This segmentation allows each component to perform its specific function optimally, achieving high sensitivity through cumulative label accumulation on the stably-bound probe without requiring complex amplification machinery
Solution Approach 2:
The transiently-bound probe acts as an intermediary that mediates label transfer from itself to the stably-bound probe. This intermediary mechanism enables the accumulation of multiple labels on the stably-bound probe through repeated binding events, significantly enhancing detection sensitivity for low-concentration analytes without requiring complex signal amplification systems
2Measurement precision
If signal amplification or prolonged observation times are used to increase sensitivity, then detection sensitivity improves, but the assay time and complexity increase
Solution Approach 1:
The stably-bound probe is pre-positioned to bind the analyte with high stability, and the transiently-bound probe is designed to repeatedly bind and transfer labels during the assay. This preliminary arrangement of functional components allows label accumulation to occur naturally during the observation period, achieving high sensitivity without requiring prolonged observation times or complex amplification steps
Solution Approach 2:
The transiently-bound probe continuously performs label transfer to the stably-bound probe through repeated binding events throughout the assay. This continuous useful action of label accumulation enhances the signal progressively, achieving high detection sensitivity in a time-efficient manner without requiring intermittent amplification steps or extended observation periods
3Measurement precision
If conventional single-label probes are used, then the detection method is straightforward, but the limit of detection remains high
Solution Approach 1:
The label is effectively copied multiple times onto the stably-bound probe through repeated transient binding events. Each transiently-bound probe transfers its label to the stably-bound probe, creating multiple identical label copies on a single probe molecule. This copying mechanism amplifies the signal without requiring complex amplification machinery, significantly lowering the limit of detection
Solution Approach 2:
The system changes the parameter of label quantity from single to multiple labels per analyte binding event. By designing the transiently-bound probe to repeatedly bind and transfer labels, the system accumulates multiple labels on the stably-bound probe, changing the detection parameter from low signal to high signal, thereby achieving lower limits of detection while maintaining probe mechanism simplicity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances detection accuracy and sensitivity by allowing for end-point measurement, reducing the limit of detection and simplifying data analysis, while maintaining high specificity for analytes, especially those at low concentrations.
Implementation Method 1
the label is irreversibly (e.g., substantially or effectively irreversibly) transferred from the tally probe to the integrator probe when the integrator probe and the tally probe are both bound to the analyte
Implementation Method 2
an integrator probe that is capable of stably associating with an analyte
Implementation Method 3
a tally probe comprising a label and that is capable of directly or indirectly associating with the analyte
Data Source
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AI summary
Provided herein is technology relating to analyte detection and particularly, but not exclusively, to compositions, methods, systems, and kits for high-specificity detection of analytes using molecular probes that integrate cumulative repeated binding of probes to the same analyte molecule.