Ambient-Temperature Nucleic Acid Amplification for Low-Abundance Detection
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Solution Overview
Problem
Existing nucleic acid amplification and detection methods require higher than ambient temperatures, which are not suitable for resource-limited settings and point-of-care applications.
Innovation Solution
Isothermal nucleic acid amplification at or near ambient temperatures using compositions and methods that include specific primers, enzymes, and DNA polymerases to amplify and detect nucleic acids, particularly low-abundance targets, utilizing single-strand displacement amplification (SDA) and CRISPR/Cas systems for sensitive detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional nucleic acid amplification methods are used, then amplification can be achieved, but high temperatures above ambient are required which are not suitable for resource-limited settings
Solution Approach 1:
The patent modifies the operating temperature parameter by using isothermal conditions at ambient temperature instead of conventional high-temperature cycling. This is achieved through the combination of SDA primers with blocking molecules and stabilization sequences, along with specific enzyme selections (strand-displacing polymerase, nickase, single-strand binding protein) that function optimally at ambient temperatures, thereby resolving the contradiction between reliable amplification and operating temperature requirements
Solution Approach 2:
The patent introduces several intermediary components: blocking molecules that temporarily prevent primer extension until displaced, stabilization sequences that enhance primer binding at ambient temperature, and single-strand binding proteins that facilitate strand separation without heat. These intermediaries enable the amplification process to proceed reliably at ambient temperatures by mediating the biochemical reactions that would otherwise require high temperatures
2Adaptability or versatility
If isothermal amplification at ambient temperature is used, then resource-limited settings become accessible, but detection sensitivity for low-abundance targets must be maintained
Solution Approach 1:
The patent merges multiple amplification cycles into a single isothermal amplification process that occurs at ambient temperature. By combining the SDA primer hybridization, blocking molecule displacement, and strand-displacing polymerase activity into one continuous isothermal process, the system achieves both the adaptability for resource-limited settings and sufficient amplification of low-abundance targets to maintain detection sensitivity
Solution Approach 2:
The isothermal amplification process maintains continuous useful action at constant ambient temperature, eliminating the need for temperature cycling. The continuous displacement of blocking molecules and subsequent polymerase activity proceed uninterrupted, ensuring robust amplification of even low-abundance target sequences while maintaining the simplicity and adaptability required for resource-limited settings
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
Enables sensitive and robust amplification and detection of nucleic acids at ambient temperatures, suitable for resource-limited settings and point-of-care diagnostics, with the ability to detect low-abundance nucleic acids effectively.
Implementation Method 1
a DNA polymerase having strand displacement activity
Implementation Method 2
a single stranded binding protein
Implementation Method 3
a cleavage enzyme
Data Source
AI summary
The present disclosure provides improved compositions and methods for amplification and detection of target nucleic acid(s) at ambient temperatures.