CRISPR-Cas Isothermal Nucleic Acid Amplification
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Solution Overview
Problem
Current isothermal nucleic acid amplification methods lack speed and efficiency, often requiring additional enzymes and reagents like ATP, and typically involve temperature cycling and fluid exchanges, which are inefficient for certain applications.
Innovation Solution
The use of CRISPR-Cas systems, specifically with CRISPR RNA (crRNA) and CRISPR-associated (Cas) proteins, to amplify target nucleic acids by forming complexes, hybridizing primers, and extending nucleic acids in isothermal conditions without the need for ATP or energy investment, allowing for rapid and efficient amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional isothermal amplification methods are used, then amplification can be performed without temperature cycling, but the speed and efficiency are insufficient and additional enzymes/reagents are required
Solution Approach 1:
The patent replaces conventional enzymatic amplification mechanisms with a CRISPR-Cas based mechanism. The Cas protein guided by crRNA binds to target DNA and enables primer extension without requiring traditional polymerases or ATP-dependent enzymes, thereby eliminating the need for additional reagents while maintaining isothermal conditions and improving amplification efficiency
Solution Approach 2:
The patent extracts and eliminates unnecessary components from conventional amplification systems. By using CRISPR-Cas mediated strand displacement, the method removes the requirement for ATP, additional enzymes, and complex buffer reagents, achieving simplified amplification with only essential components while improving both speed and efficiency
2Productivity
If conventional amplification methods are used, then adequate amplification can be achieved, but temperature cycling and fluid exchanges are required which reduce efficiency
Solution Approach 1:
The patent implements continuous isothermal amplification without temperature cycling. The CRISPR-Cas system operates at a constant temperature, enabling continuous primer binding and strand displacement reactions without the need for heating/cooling cycles or fluid exchanges, thereby maintaining operational simplicity while improving amplification efficiency
Solution Approach 2:
The patent eliminates periodic temperature changes and replaces them with continuous isothermal operation. The CRISPR-Cas mediated mechanism proceeds continuously at constant temperature through sequential binding and displacement events, removing the need for periodic temperature cycling and fluid handling steps
3Productivity
If CRISPR-Cas systems are used for amplification, then speed and efficiency are improved, but the system complexity increases
Solution Approach 1:
The patent leverages the universal nature of CRISPR-Cas systems which can be programmed with different crRNAs to target various DNA sequences. This multi-functionality allows a single Cas protein system to perform diverse amplification tasks, reducing the need for multiple specialized enzymes and reagents, thereby managing system complexity while maintaining high amplification speed
Solution Approach 2:
The CRISPR-Cas system exhibits self-service characteristics where the crRNA-guided Cas protein automatically binds to complementary target sequences and facilitates primer extension through strand displacement. This autonomous mechanism reduces the need for complex external control systems, buffers, and additional enzymatic components, simplifying the overall system while achieving rapid amplification
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 method provides a cost- and time-efficient means of nucleic acid amplification that is both rapid and efficient, eliminating the need for temperature cycling and additional reagents, thereby improving the speed and efficiency of nucleic acid amplification processes.
Implementation Method 1
contacting the target double-stranded nucleic acid with the system to form a complex
Implementation Method 2
extending a nucleic acid complementary to the second strand of the target double-stranded nucleic acid from the primer using a polymerase
Data Source
AI summary
A method for amplifying a target nucleic acid including providing a system having a crRNA or a derivative thereof, and a Cas protein or a variant thereof. The crRNA or the derivative thereof contains a target-specific nucleotide region substantially complementary to a region of the target nucleic acid, and contacting the target nucleic acid with the system to form a complex.