Small RNA Detection Probes for High-Precision Hybridization
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Solution Overview
Problem
Conventional methods for detecting and quantifying small RNA molecules, such as microRNA, are challenging due to their small size and susceptibility to enzymatic degradation, making it difficult to detect them amidst overwhelming signals from abundant non-target RNA transcripts.
Innovation Solution
A method involving probes complementary to at least 10 consecutive nucleotides starting from the 3' end of small RNA molecules, which are coupled to a support, allowing for specific binding and detection on nucleic acid arrays, even in the presence of large RNA molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used to detect small RNA molecules, then the detection process is simple, but the detection precision is poor due to overwhelming signals from abundant non-target RNA transcripts
Solution Approach 1:
The probe is designed to bind specifically to the 3' end region of the small RNA molecule rather than the entire sequence. This localized binding approach allows the probe to distinguish small RNA from abundant non-target transcripts by targeting a specific region where sequence complementarity provides unique identification, thereby improving detection precision without requiring complex multi-step procedures
Solution Approach 2:
The detection method segments the small RNA molecule by focusing detection on a specific portion (the 3' end) rather than requiring detection of the entire molecule. This segmentation allows the use of shorter probes that can specifically target the 3' end region, enabling precise detection of small RNA amidst background noise from other transcripts
2Measurement precision
If probes bind to small RNA molecules, then detection sensitivity improves, but cross-hybridization with non-target RNA increases
Solution Approach 1:
The probe targets specifically the 3' end region of the small RNA molecule, creating a localized binding site that exploits sequence uniqueness in this region. This local quality approach allows the probe to achieve high binding affinity and sensitivity while reducing cross-hybridization, as the 3' end sequence provides specific identification that distinguishes target small RNA from non-target transcripts
Solution Approach 2:
The method extracts or isolates the 3' end region of the small RNA as the specific binding target. By taking out this specific portion for detection purposes, the probe can achieve high sensitivity through focused binding while avoiding cross-hybridization issues that would arise from binding to more variable or conserved regions of the RNA molecule
3Measurement precision
If small RNA molecules are detected in complex samples, then comprehensive analysis is achieved, but the small RNA remains undetectable due to overwhelming signal from abundant non-target RNA transcripts
Solution Approach 1:
The probe exploits local sequence quality at the 3' end of small RNA molecules to achieve specific binding. By targeting this specific region with high sequence uniqueness, the probe generates a detectable signal that stands out against the background of abundant non-target transcripts, enabling detection despite the small RNA's low relative abundance in complex samples
Solution Approach 2:
The method changes the binding parameter by targeting a specific region (3' end) rather than requiring binding across the entire small RNA sequence. This parameter change in binding location and length allows the probe to achieve sufficient binding affinity for detection while maintaining specificity, overcoming the signal suppression effect caused by the low abundance of small RNA relative to other transcripts
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 enables effective detection and quantitation of small RNA molecules by exploiting their unique binding characteristics, reducing cross-hybridization and enhancing the stability of probe-RNA duplexes, thus overcoming the limitations of existing detection methods.
Implementation Method 1
consecutive nucleotides complementary to at least 10 consecutive nucleotides starting from about the 3′ end of a small RNA
Data Source
AI summary
Aspects of the disclosure are generally directed to probes and probe compositions for detecting or quantifying a target. One aspect provides a method for selectively hybridizing a probe to a polynucleotide by contacting a sample containing a first and second polynucleotide with a probe. The probe includes a number of nucleotides complementary to the first or second polynucleotide in the region of mismatch between the first and second polynucleotides. Another aspect provides arrays including the disclosed probes and methods of using the arrays and the probes.