Multi-Labeled Polymeric Scaffold for miRNA Detection
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Solution Overview
Problem
Current methods for labeling and detecting microRNA (miRNA) molecules in microarray analyses are inefficient, lacking sensitivity and requiring multiple hybridization steps, which hinders high-throughput analysis and introduces biases in PCR-based methods.
Innovation Solution
A multi-labeled polymeric scaffold is attached directly to the 3′ end of miRNA molecules, reducing quenching and enhancing signal intensity, allowing for rapid and efficient hybridization on detection platforms like microarrays and bead-based assays, using a nucleic acid labeling molecule with a 5′ phosphate for ligation and a plurality of label molecules capable of emitting a detectable signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If covalent attachment of fluorophores is used to directly label miRNA molecules, then the labeling process is simple, but the sensitivity to detect rare target miRNA molecules is insufficient
Solution Approach 1:
The patent combines multiple fluorophores onto a single polymeric scaffold that attaches to the miRNA, creating a multi-labeled complex that amplifies the signal while maintaining direct attachment simplicity. This merging of multiple labeling functions onto one scaffold resolves the contradiction between simple labeling and high sensitivity.
Solution Approach 2:
The patent uses a composite polymeric scaffold structure that integrates multiple fluorophores, nucleic acid sequences, and functional groups into a single multifunctional reagent. This composite material provides both the simplicity of direct attachment and the enhanced sensitivity through multiple signal-emitting units.
2Speed
If direct labeling of miRNA molecules is performed, then the process is rapid, but intermolecular quenching of randomly incorporated fluorophores occurs, decreasing sensitivity
Solution Approach 1:
The patent positions fluorophores at specific locations on the polymeric scaffold rather than random incorporation, creating local regions of high signal density while avoiding quenching zones. This localized arrangement maintains rapid labeling while preventing intermolecular quenching effects.
Solution Approach 2:
The polymeric scaffold acts as an intermediary structure that separates and spaces the fluorophores, preventing direct interaction and quenching between them. This intermediary scaffold allows rapid attachment while maintaining signal intensity by mediating the spatial arrangement of fluorophores.
3Quantity of substance
If PCR-based methods are used to monitor miRNA expression, then amplification can be achieved, but significant biases are introduced into the population of amplified target miRNA molecules
Solution Approach 1:
The patent extracts and eliminates the PCR amplification step from the miRNA detection workflow, using direct labeling and hybridization instead. This removal of the biased amplification process maintains the integrity of the original miRNA population while still achieving sufficient signal through direct detection methods.
Solution Approach 2:
The patent creates a faithful copy of the miRNA detection process through direct hybridization to complementary probes, avoiding the distortions introduced by PCR copying. This direct copying approach preserves the original miRNA population characteristics while achieving detectable signal levels.
4Measurement precision
If multiple hybridization steps are used in existing detection methods, then detection sensitivity can be improved, but the analysis time increases, hindering high-throughput analysis
Solution Approach 1:
The patent performs preliminary labeling of the miRNA with the multi-fluorophore scaffold before hybridization to the array, so that the signal-generating components are already in place. This preliminary action eliminates the need for post-hybridization labeling steps, maintaining high sensitivity while enabling rapid high-throughput analysis.
Solution Approach 2:
The patent ensures continuous signal generation by incorporating fluorophores directly into the labeling molecule that hybridizes to the array, eliminating interruptions between hybridization and signal detection. This continuous action maintains detection sensitivity while significantly reducing the time required for complete analysis.
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 accuracy and sensitivity of miRNA analysis, enabling rapid and efficient labeling and detection of miRNA molecules, particularly in high-throughput analyses, without the need for PCR, thus overcoming the limitations of existing methods.
Implementation Method 1
a nucleic acid labeling molecule is attached directly to the 3′ end of the miRNA molecules
Implementation Method 2
a plurality of label molecules capable of emitting or producing a detectable signal
Data Source
AI summary
Methods, reagents and kits are provided for the production and use in detection assays of labeled nucleic acid molecules wherein a labeling molecule is attached directly to the 3′ end of the nucleic acid molecules.