TNT Biosensor Using Preferential Odorant Receptor Expression
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Solution Overview
Problem
Current methods are inefficient in expressing and detecting odorant receptors responsive to trinitrotoluene (TNT) in vitro, hindering the development of sensitive sensors for TNT detection, which is crucial for military, environmental, and health safety due to TNT's explosive and toxic properties.
Innovation Solution
Development of biosensors that preferentially express specific TNT-responsive odorant receptors in olfactory sensory neurons, allowing for the detection of TNT through activation of these receptors, which can be engineered into mammals or used in biochemical assays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to express odorant receptors in vitro, then the detection capability for TNT is insufficient, but the complexity of the system increases when using mammalian cell lines or in vivo models
Solution Approach 1:
The patent extracts and isolates specific odorant receptors (Olr710, Olr300, Olr319) that are responsive to TNT from the complex mammalian olfactory system. By focusing on individual receptor populations rather than using entire mammalian cell lines or in vivo models, the invention achieves high detection precision for TNT while reducing system complexity. The isolated receptors can be expressed in simpler heterologous systems.
Solution Approach 2:
The invention segments the broad olfactory detection system into specific functional units - individual odorant receptor populations that respond to TNT. By dividing the complex mammalian olfactory epithelium into discrete receptor populations (Olr710, Olr300, Olr319), the patent enables targeted detection with reduced complexity compared to using the entire mammalian system.
2Measurement precision
If broad chemical detection is maintained in the olfactory sheet, then each odorant receptor is equally distributed but only expressed in 0.1% of all OSNs, resulting in low sensitivity for specific detection
Solution Approach 1:
The patent applies local quality by concentrating specific odorant receptor populations (Olr710, Olr300, Olr319) that are responsive to TNT. Instead of relying on the natural distribution where each receptor is expressed in only 0.1% of olfactory sensory neurons, the invention enriches or preferentially expresses these specific receptor populations, thereby achieving high sensitivity for TNT detection while maintaining the ability to detect other chemicals through the broader olfactory system.
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 biosensors significantly decrease the detection threshold for TNT, enabling early detection and prevention of exposure, improving public health and environmental safety by providing a sensitive and specific means to identify TNT presence.
Implementation Method 1
olfactory perception of chemicals in an odor stream is based on the combinatorial activation of specific detectors, called odorant receptors (ORs)... Each OSN expresses only one OR gene in a highly regulated way... biosensors that preferentially express specific TNT-responsive odorant receptors in olfactory sensory neurons, allowing for the detection of TNT through activation of these receptors
Data Source
AI summary
A biosensor for detecting trinitrotoluene (TNT) is disclosed. The biosensor has cells, such as olfactory sensory neurons (or cilia derived therefrom), that preferentially express a TNT-responsive odorant receptor protein.