RNase H Assisted Rolling Circle Amplification for RNA Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for in situ detection of nucleic acids in biological samples suffer from low sensitivity, specificity, and detection efficiency, particularly in oligonucleotide probe-based assays, necessitating improved techniques for analyzing nucleic acids.
Innovation Solution
The use of RNase H to assist in rolling circle amplification (RCA) with circular or circularizable probes, allowing for direct RNA detection without reverse transcription, combined with an external oligonucleotide primer, enhances sensitivity and specificity by facilitating the amplification process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If oligonucleotide probe-based assay methods are used for in situ analysis, then detection can be performed, but sensitivity, specificity, and detection efficiency are low
Solution Approach 1:
The probe is pre-formed as a circular or circularizable structure with a specific sequence complementary to the target nucleic acid. This preliminary preparation enables the probe to directly hybridize to the target and initiate rolling circle amplification without requiring additional processing steps, thereby improving detection sensitivity and efficiency
Solution Approach 2:
A circular or circularizable probe serves as an intermediary molecule that bridges the target nucleic acid and the rolling circle amplification process. The probe hybridizes to the target and provides a template for amplification, enhancing both sensitivity and specificity of detection
2Measurement precision
If traditional RCA-based direct RNA detection is used, then RNA detection can be performed, but sensitivity and efficiency are limited
Solution Approach 1:
The method changes the fundamental parameters of the detection system by using a circular or circularizable probe instead of linear probes, and by implementing rolling circle amplification instead of traditional amplification methods. These parameter changes result in exponential amplification of the target signal, dramatically improving both sensitivity and efficiency of RNA detection
3Ease of operation
If reverse transcription is performed before RCA, then RNA can be converted to cDNA for detection, but the process becomes more complex and time-consuming
Solution Approach 1:
The method extracts and eliminates the reverse transcription step from the traditional detection workflow. By using a circular or circularizable probe that can directly hybridize to RNA and initiate rolling circle amplification, the complex reverse transcription process is removed, simplifying the procedure and reducing detection time while maintaining detection capability
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 improves the sensitivity and efficiency of RNA detection, reducing variability across different sample types and gene panels, and provides more accurate results compared to traditional methods.
Implementation Method 1
the RNase H cleaves the target RNA in the duplex at one or more sites to generate a target RNA fragment
Implementation Method 2
the circular or circularizable probe comprises a hybridization region that hybridizes to a target RNA sequence in a target RNA
Implementation Method 3
performing rolling circle amplification (RCA) using the circular probe or a circularized probe formed by circularizing the circularizable probe as template
Data Source
AI summary
The present disclosure relates in some aspects to methods for analyzing a target RNA in a biological sample, such as detection of a sequence of interest in an RNA. In some aspects, provided herein are methods of using an RNase such as RNase H to provide in situ RNA detection methods having high sensitivity, efficiency, and/or specificity.