MNAzyme Nucleic Acid Enzymes for Contamination-Free Detection
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Solution Overview
Problem
Current nucleic acid detection methods, such as PCR, rely on protein enzymes, increasing complexity and cost, and are prone to contamination and false positives due to the use of protein enzymes, which limits their effectiveness in target detection and amplification systems.
Innovation Solution
The development of multi-component nucleic acid (MNA) complexes, specifically MNAzymes with ligase activity, which self-assemble in the presence of a target to form catalytically active enzymes, allowing for target detection and amplification without the need for protein enzymes, using oligonucleotide components that self-assemble to form active MNAzymes capable of ligating or cleaving substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protein enzymes are used in nucleic acid detection methods, then detection and amplification can be achieved, but complexity and cost increase, and contamination and false positives occur
Solution Approach 1:
The patent replaces protein enzymes with nucleic acid-based catalytic systems (DNAzymes and RNAzymes) that perform the same catalytic functions. This substitution eliminates the complexity and contamination issues associated with protein enzymes while maintaining detection and amplification capabilities through nucleic acid-based catalysis.
Solution Approach 2:
The patent changes the fundamental parameter of catalyst composition from protein-based to nucleic acid-based. This parameter change allows the system to achieve enzyme-like catalytic activity using DNA or RNA molecules, thereby reducing system complexity and eliminating protein-related contamination while maintaining functional equivalence.
2Productivity
If protein enzymes are used in nucleic acid detection methods, then detection and amplification can be achieved, but cost increases
Solution Approach 1:
The patent substitutes expensive protein enzymes with cheaper nucleic acid-based catalysts. Nucleic acids can be synthesized more economically than proteins, and the catalytic DNAzymes/RNAzymes perform the same functions at lower cost while maintaining detection efficiency.
Solution Approach 2:
The patent employs nucleic acid-based catalysts that are cheaper to produce and can be easily synthesized. These catalysts replace expensive protein enzymes while providing sufficient functionality for detection and amplification, reducing overall manufacturing costs.
3Productivity
If protein enzymes are used in nucleic acid detection methods, then amplification can be achieved, but contamination and false positives increase
Solution Approach 1:
The patent changes the catalyst material parameter from protein to nucleic acid, which fundamentally eliminates the source of protein-related contamination. Nucleic acid-based catalysts do not introduce foreign protein contaminants that could cause false positives, while still providing the necessary amplification capability through catalytic activity.
Solution Approach 2:
The patent replaces protein-based catalysis with nucleic acid-based catalysis, eliminating the harmful effect of protein contamination. The DNAzymes and RNAzymes provide the same amplification function without introducing protein contaminants that could lead to false positive results.
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 enables efficient and cost-effective detection and amplification of targets by forming active MNAzymes that can ligate or cleave substrates, reducing contamination and false positives, and providing a robust method for nucleic acid detection and quantification.
Implementation Method 1
The MNA complexes may be active enzymes (e.g. MNAzymes including apta-MNAzymes) with modifying activity such as ligase or cleavage activity. Single stranded nucleic acids, such as DNA and RNA, have the ability to fold into complex three-dimensional structures that can function as highly specific receptors (e.g. aptamers) and catalysts (e.g. ribozymes, DNAzymes).
Implementation Method 2
A wide variety of nucleic acid molecules, with enzymatic or catalytic activity, have been discovered in the last 20 years. RNA enzymes ('ribozymes') occur in nature but can be engineered to specifically recognize and modify a target RNA substrate. In vitro evolution techniques have facilitated the discovery and development of many more catalytic nucleic acids, including deoxyribonucleic acids often referred to as 'DNA enzymes' or 'DNAzymes'.
Data Source
AI summary
The present invention relates to methods that utilize multi-component nucleic acid complex (MNA complex) cascades. The MNA complexes may have cleavage or ligase activity. Further, the invention provides cascades which may include one or more DNAzymes. The invention also provides methods which use these cascades for the identification, detection and quantification of targets.