RCA Product Compaction for Stable In Situ Nucleic Acid Detection
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Solution Overview
Problem
Existing methods for in situ analysis of nucleic acids suffer from low sensitivity, specificity, and detection efficiency, particularly due to destabilization of probe/target hybridization complexes and rolling circle amplification products, leading to impaired signal fidelity and loss of information.
Innovation Solution
The method involves generating a rolling circle amplification (RCA) product with a biotin moiety conjugated to nucleotides and using avidin or streptavidin to compact the product, reducing its size by up to 50% through high-affinity binding, thereby enhancing stability and resolution of nucleic acid signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rolling circle amplification is performed to generate nucleic acid concatemers for in situ analysis, then signal amplification and detection sensitivity are improved, but the nucleic acid structures become destabilized and lose spatial fidelity during wash conditions
Solution Approach 1:
The patent applies preliminary action by performing crosslinking of the nucleic acid concatemers to the substrate before the wash conditions are applied. This pre-stabilization step ensures that the amplified structures remain firmly attached and maintain their spatial configuration throughout subsequent processing steps, preventing destabilization while preserving the detection sensitivity gains from amplification
Solution Approach 2:
The patent implements beforehand cushioning by introducing protective measures in the form of crosslinking agents that create stable covalent bonds between the nucleic acid concatemers and the substrate. This protective layer acts as a buffer against the destabilizing effects of stringent wash conditions, ensuring that the amplified signals remain intact and spatially faithful throughout the assay process
2Measurement precision
If nucleic acid structures are compacted to improve resolution, then spatial fidelity and signal resolution are improved, but the complexity of the method increases
Solution Approach 1:
The patent employs an intermediary approach by using a two-step compaction process: first, nucleic acid concatemers are generated through rolling circle amplification, and second, they are compacted using a separate compaction reagent or condition. This intermediary step allows the amplified structures to be systematically organized and compacted without requiring complete redesign of the amplification system, thereby improving resolution while managing method complexity through modular addition of the compaction step
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 compaction of RCA products improves signal intensity and resolution, allowing for better detection and analysis of nucleic acid structures in biological samples, such as fresh, frozen, or formalin-fixed paraffin-embedded tissues.
Implementation Method 1
using avidin or streptavidin to compact the product, reducing its size by up to 50% through high-affinity binding
Data Source
AI summary
The present disclosure in some aspects relates to methods and compositions for accurately detecting and quantifying multiple analytes present in a biological sample. In some aspects, the methods and compositions provided herein address one or more issues associated with the stability and/or size of nucleic acid structures such as rolling circle amplification products in the biological sample.