Automated 2′-O-Methyl RNA Probe Detection With Tyramide Amplification
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Solution Overview
Problem
Existing RNA detection technologies struggle with sensitivity and specificity, particularly for short microRNA targets, due to limited target sequence length, stability issues, and the need for significant amplification, which are not adequately addressed by current methods.
Innovation Solution
The use of 2′-O-methyl RNA oligonucleotide probes labeled with detectable moieties for in-situ hybridization, combined with tyramide signal amplification, enables sensitive and specific detection of RNA molecules, including microRNA, in formalin-fixed paraffin-embedded tissue samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional RNA detection methods are used, then detection can be performed, but sensitivity is insufficient for short microRNA targets
Solution Approach 1:
The patent implements nested amplification where tyramide signal amplification is combined with branched-DNA amplification. The tyramide system first amplifies the signal from the probe-target hybrid, creating multiple tyramide molecules per probe. Then branched-DNA amplification further amplifies this signal, creating a nested amplification architecture that achieves sufficient signal for detecting short microRNA targets
Solution Approach 2:
The patent changes the chemical structure of the probe by using 2′-O-methyl RNA oligonucleotides instead of conventional RNA or DNA probes. This parameter change in probe chemistry provides enhanced binding affinity to RNA targets and increased stability, thereby improving detection sensitivity for short microRNA sequences
2Measurement precision
If probe length is increased to improve specificity, then target specificity improves, but short microRNA targets cannot be detected
Solution Approach 1:
The patent changes the chemical composition and structure of the probe by using 2′-O-methyl RNA oligonucleotides. This parameter change provides enhanced binding affinity and specificity to RNA targets while maintaining the ability to work with short probe lengths appropriate for microRNA detection, resolving the contradiction between probe length and target specificity
3Measurement precision
If RNA probes are used for detection, then detection sensitivity improves, but nuclease degradation reduces reliability
Solution Approach 1:
The patent changes the chemical structure of the probe by incorporating 2′-O-methyl modifications into the RNA oligonucleotide. This parameter change confers nuclease resistance to the probe while maintaining its ability to hybridize to RNA targets with high sensitivity, thereby resolving the contradiction between detection sensitivity and probe stability
Solution Approach 2:
The patent creates a composite probe structure by combining RNA bases with 2′-O-methyl sugar modifications. This composite material approach provides both the hybridization capability of RNA and the nuclease resistance of modified sugars, achieving both high detection sensitivity and probe stability
4Measurement precision
If extensive amplification is used to detect short targets, then detection sensitivity improves, but device complexity increases
Solution Approach 1:
The patent implements nested amplification where tyramide signal amplification is combined with branched-DNA amplification. This nested architecture provides extensive amplification capability while organizing the complexity in a structured, multi-layered system that can be integrated into automated platforms
5Adaptability or versatility
If manual detection methods are used, then flexibility is maintained, but automation capability is limited
Solution Approach 1:
The patent develops a universal detection platform that can detect various RNA targets including microRNA, mRNA, and non-coding RNA using the same 2′-O-methyl RNA probe technology and amplification system. This multi-functional approach enables automation while maintaining flexibility across different target types
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 provides enhanced binding affinity and nuclease resistance, allowing for robust and automated detection of RNA species, including microRNA, with improved sensitivity and preservation of cell morphology.
Implementation Method 1
contacting the sample with a labeled synthetic 2'-O-methyl oligonucleotide probe under conditions sufficient that the probe hybridizes to the target RNA in the sample
Implementation Method 2
combined with tyramide signal amplification, enables sensitive and specific detection of RNA molecules
Data Source
AI summary
Disclosed herein are methods and compositions for detecting differential expression of certain miRNAs in cancer cells or their surrounding normal tissues in the tumor microenvironment. The disclosure describes an automated, highly sensitive and specific method for detection of any cellular RNA molecule, including microRNA, messenger RNA and non-coding RNA. The technology includes probe design as well as probe use in an automated fashion for detection of RNA molecules in formalin-fixed paraffin-embedded tissue (FFPET) samples.