Mango Aptamer Biosensor with Modular Stems for Sensitivity
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Solution Overview
Problem
Current fluorogenic aptamers, such as RNA Mango and RNA Spinach, face limitations in signal-to-background ratio and sensitivity, making them less effective as biosensors, especially when detecting targets in low quantities, and there is a need for improved designs that can maintain ligand binding and fluorescence enhancement without disrupting the G-quadruplex core.
Innovation Solution
The development of nucleic acid molecules with additional open or closed stems attached to the Mango aptamer core, incorporating a linker and sensor domain, which allows for conformational changes upon target ligand binding, enhancing the biosensor's ability to bind reporter molecules and improve detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional stems are added to the Mango aptamer core, then sensitivity and signal-to-background ratio are improved, but device complexity increases
Solution Approach 1:
The biosensor is divided into distinct functional modules: a Mango aptamer core domain for fluorophore binding, linker domains for structural connection, and sensor domains for target recognition. This segmentation allows each component to be optimized independently while contributing to overall sensitivity without proportionally increasing complexity.
Solution Approach 2:
The additional stems are nested around the central G-quadruplex core of the Mango aptamer, with linker and sensor domains arranged in hierarchical layers. This nested architecture allows multiple functional elements to be packed efficiently without linearly increasing the overall structural footprint.
2Power
If additional stems are added to enhance conformational changes, then signal output is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent systematically varies parameters such as stem length, linker sequence composition, and sensor domain configuration to optimize conformational switching behavior. By tuning these parameters, the design achieves robust fluorescence signal changes while maintaining tolerance to typical synthesis variations.
Solution Approach 2:
The additional stems are designed to be dynamically responsive to target binding events, undergoing conformational transitions that amplify the fluorescence signal. This dynamic behavior is achieved through carefully engineered base-pairing interactions that provide sufficient stability in the apo state but allow easy transition upon target binding.
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
The modular biosensor design with additional stems enhances the signal-to-background ratio and sensitivity, enabling effective detection of target molecules, even at low concentrations, by inducing a conformational change in the reporter domain that improves fluorescence binding and signal output.
Implementation Method 1
A high fluorescence signal above background is possible due to fluorescence enhancement of a second molecule upon binding to the aptamer
Implementation Method 2
The linker domain may effect a conformational change in the reporter domain in response to a target ligand molecule binding to the sensor domain
Implementation Method 3
aptamers comprised of nucleic acids that may bind fluorogenic molecules
Data Source
AI summary
The present disclosure relates to oligonucleotide biosensors that bind to a fluorophore through a reporter domain and to one or more target ligand(s) through one or more target domain(s), which is connected to the reporter domain through one or more linker domain(s). The binding of the target ligand to the target domain affects the fluorescence of the fluorophore when excited by the appropriate wavelength of energy, either by causing dimming or allosteric fluorescence. Methods of selecting biosensors and their use to detect target ligands are also described.