Taq DNA Polymerase Mutations for Mismatch-Selective PCR
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Solution Overview
Problem
Existing PCR-based methods for detecting gene variations and SNPs suffer from low selectivity and require time- and cost-intensive optimization due to the incompatibility of polymerases in differentiating mismatched bases, leading to false positives and the need for additional purification and analysis.
Innovation Solution
A DNA polymerase with specific amino acid mutations (E507K, R536K/R660V, or R536K/R587I/R660V) and an optimized PCR buffer composition enhance mismatch-to-match extension selectivity, allowing reliable gene variation-specific amplification without substrate modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PCR methods are used for detecting gene variations, then amplification can be achieved, but selectivity is low and false positives occur due to inability to differentiate mismatched bases
Solution Approach 1:
The patent applies parameter changes by modifying the amino acid sequence of Taq polymerase at specific positions (507, 536, 587, 660) to alter its enzymatic properties. These mutations change the polymerase's ability to discriminate between matched and mismatched bases, thereby improving selectivity and detection accuracy without sacrificing amplification capability
Solution Approach 2:
The patent creates a composite enzymatic system by combining multiple amino acid mutations (E507K, R536K, R587I, R660V) within the Taq polymerase structure. This composite approach synergistically enhances mismatch discrimination capability beyond what single mutations can achieve, resolving the contradiction between amplification efficiency and detection selectivity
2Measurement precision
If gene variation-specific amplification is used to improve detection selectivity, then sensitivity increases, but the method requires more complicated and time-intensive optimization
Solution Approach 1:
The mutated Taq polymerase exhibits self-service by inherently possessing enhanced mismatch discrimination capability through its modified amino acid structure. This eliminates the need for external optimization steps or additional reagents to achieve gene variation-specific amplification, thereby maintaining high detection sensitivity while reducing procedural complexity
Solution Approach 2:
The patent performs preliminary action by pre-mutating the Taq polymerase amino acid sequence before the PCR reaction. This预先 modification embeds the selectivity enhancement directly into the enzyme's structure, so that when the polymerase is used in standard PCR conditions, it automatically provides both amplification and high-selectivity detection without requiring subsequent optimization
3Measurement precision
If allele-specific amplification is employed to detect specific variations, then detection specificity improves, but additional purification and analysis steps are required
Solution Approach 1:
The patent merges amplification and detection functions into a single PCR reaction by using the mutated Taq polymerase that inherently discriminates mismatches during synthesis. This combination eliminates the need for separate purification and analysis steps, achieving both high detection specificity and reduced total analysis time
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 modified DNA polymerase and buffer composition enable accurate detection of gene variations and SNPs with higher specificity, improving the reliability and efficiency of PCR-based diagnostics and recombinant DNA studies.
Implementation Method 1
a DNA polymerase comprising a Taq polymerase amino acid sequence... including a substitution at amino acid residue 507... and substitutions at amino acid residues 536 and 660
Data Source
Figure 1(a)~1(b)
Figure 2~3
Figure 4
AI summary
The present invention relates to a DNA polymerase having increased gene mutation specificity and a PCR buffer composition for increasing activity of the DNA polymerase. More specifically, provided, in the present invention, are a DNA polymerase in which a mutation is induced at a specific amino acid position to increase gene mutation specificity, a nucleic acid sequence encoding the polymerase, a vector comprising the nucleic acid sequence, and a host cell transformed with the vector. In addition, provided are a method for in vitro detecting one or more gene mutations or SNPs in one or more templates by using a DNA polymerase having increased gene mutation specificity, a composition for detecting a gene mutation or SNP comprising the DNA polymerase, and a PCR kit comprising said composition. Furthermore, provided are a PCR buffer composition for increasing the activity of a DNA polymerase having increased gene mutation specificity, a PCR kit for detecting a gene mutation or SNP comprising the PCR buffer composition and/or the DNA polymerase having increased gene mutation specificity, and a method for in vitro detecting one or more gene mutations or SNPs in one or more templates by using the kit.