Transmembrane Nanosensor Arrays for Exosome miRNA Detection
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Solution Overview
Problem
Current exosome-based diagnostic techniques for cancer are hindered by tedious, expensive, and time-consuming methods for isolating and analyzing exosomal micro-RNAs (ex-miRNAs), which lack specificity and sensitivity, and require destructive processes that obscure biomarker profiles.
Innovation Solution
A transmembrane nanosensor device comprising a lipid-conjugated DNA tweezer with a hairpin loop and fluorophore-quencher pair that transitions from a closed to open conformation upon binding to a target polynucleotide, allowing for non-destructive detection of ex-miRNAs within intact exosomes, enabling direct sensing and quantification without the need for extraction or amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current exosome-based diagnostic techniques are used, then cancer biomarkers can be detected, but the process is tedious, expensive, and time-consuming requiring isolation and lysis of exosomes
Solution Approach 1:
The patent extracts only the essential detection function from the complex isolation and lysis process. The nanosensor array enables direct detection of exosomal miRNAs in intact exosomes within crude lysates, eliminating the need for tedious isolation and purification steps while maintaining detection capability.
Solution Approach 2:
The patent introduces an intermediary approach by using nanosensors that can function in crude lysates without requiring complete exosome isolation. The sensors act as mediators that can detect targets in the presence of other cellular components, bridging the gap between crude samples and purified exosomes.
2Measurement precision
If exosomes are lysed to extract miRNAs for detection, then miRNA content can be analyzed, but the process mixes ex-miRNA from different sub-populations and free-flowing miRNAs, obscuring specificity
Solution Approach 1:
The patent applies local quality by creating distinct sensing zones on the nanosensor array where different sensors can selectively detect specific exosomal miRNA sub-populations. This localized detection approach maintains specificity without requiring complete mixing and isolation of all miRNAs.
Solution Approach 2:
The patent segments the detection process by using multiple specialized nanosensors on an array, each designed to detect specific exosomal miRNA sub-populations. This segmentation allows simultaneous detection of different biomarkers while maintaining their individual specificity, avoiding the mixing problem of traditional lysis methods.
3Ease of manufacture
If traditional exosome isolation methods are used, then exosomal miRNAs can be extracted, but the methods are tedious and require special training
Solution Approach 1:
The patent enables self-service detection by designing nanosensors that can directly interact with exosomes in crude lysates without requiring complex isolation procedures. The system is self-sufficient in handling the detection process, eliminating the need for specialized training in exosome purification techniques.
Solution Approach 2:
The patent performs preliminary action by preparing nanosensor arrays that are pre-configured to detect specific exosomal miRNAs. This pre-preparation eliminates the need for time-consuming isolation and extraction steps during the actual diagnostic process, as the sensors are ready to detect targets directly in crude samples.
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 simplifies exosome-based liquid biopsy diagnostics by providing a rapid, sensitive, and specific method for detecting cancer biomarkers, such as miR21 and miR23b, within intact exosomes, enhancing clinical feasibility and reducing costs.
Implementation Method 1
a fluorophore; and a quencher paired to the fluorophore, or a FRET pair, wherein when the hairpin loop is bound by the target polynucleotide trigger strand, the DNA tweezer transitions from a closed conformation to an open conformation, the quencher is separated from the fluorophore, and the fluorophore fluoresces
Data Source
AI summary
Disclosed herein is a transmembrane nanosensor device comprising a lipid conjugated DNA tweezer, and methods of using the same.