High-Noise In Situ Variant Detection With Collaborative Probes
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Solution Overview
Problem
Existing in situ nucleic acid detection techniques fail to achieve high specificity and sensitivity for detecting single nucleotide variations (SNVs) in tumor biopsies due to high background noise from complex cellular structures and non-target nucleic acids.
Innovation Solution
A method involving a probe system that forms a signal-generating complex (SGC) by hybridizing a single nucleotide variation probe (SP) with a neighbor probe (NP), pre-amplifiers (SPM and NPM), and a collaboration amplifier (COM), enhancing detection through collaborative hybridization, reducing false positives, and increasing signal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sets of target probes are hybridized to the target to provide sufficient signal-generating complexes, then detection sensitivity is improved, but probe complexity and background noise increase
Solution Approach 1:
The detection system is segmented into distinct functional modules: target probes for specific binding, neighbor probes for collaborative binding, preamplifiers for signal amplification, and collaboration amplifiers for coordinated signal enhancement. This segmentation allows each component to perform its specific function efficiently while reducing overall system complexity through modular design.
Solution Approach 2:
The patent implements a nested structure where multiple probe sets are organized hierarchically: target probes bind first, then neighbor probes bind adjacent to them, followed by preamplifiers binding to target probes, and finally collaboration amplifiers binding to both target and neighbor probes. This nested arrangement allows systematic signal amplification while maintaining organized probe management and reducing background noise through sequential binding.
2Device complexity
If a single set of target probes captures a single signal-generating complex, then probe complexity is reduced, but detection sensitivity decreases
Solution Approach 1:
The patent implements preliminary binding actions where target probes first bind to their specific targets, creating stable anchor points. Neighbor probes then bind adjacent to these target-probe complexes before any amplification occurs. This preliminary organization of probe-target complexes ensures that subsequent amplification steps act on pre-validated binding events, maintaining high detection sensitivity while using a coordinated rather than excessive number of probes.
Solution Approach 2:
The patent introduces neighbor probes as intermediary elements that bind adjacent to target probes and serve as binding sites for collaboration amplifiers. These intermediary neighbor probes facilitate the connection between target probes and amplification systems, enabling signal amplification while maintaining probe simplicity through a standardized three-component architecture (target probe, neighbor probe, amplifier).
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
The method provides highly sensitive and specific detection of nucleic acid variations, including SNVs, in high noise environments, such as tumor biopsies, by ensuring a stronger signal when bound to the target compared to non-specific binding, thereby improving diagnostic accuracy.
Implementation Method 1
A method involving a probe system that forms a signal-generating complex (SGC) by hybridizing a single nucleotide variation probe (SP) with a neighbor probe (NP)
Data Source
AI summary
The invention relates to methods of in situ detection of a nucleic acid variation of a target nucleic acid in a sample, including single nucleotide variations, multi-nucleotide variations or splice sites. The method can comprise the steps of contacting the sample with a probe that detects the nucleic acid variation or splice site and a neighbor probe; contacting the sample with pre-amplifiers that bind to the nucleic acid variation probe or splice site probe and neighbor probe, respectively; contacting the sample with a collaboration amplifier that binds to the pre-amplifiers; and contacting the sample with a label probe system, wherein hybridization of the components forms a signal generating complex (SGC) comprising a target nucleic acid with the nucleic acid variation or splice site, the probes and amplifiers; and detecting in situ signal from the SGC on the sample. The invention also provides samples, tissue slides, and kits relating to detection of nucleic acid variations, including single nucleotide variations, multi-nucleotide variations or splice sites, of a target nucleic acid.


