Single-Stranded Mutagenic Primer for Scalable DNA Library Generation
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Solution Overview
Problem
Current methods for introducing mutations into DNA, such as PCR-based approaches, face challenges like self-annealing of double-stranded templates, high error rates, and the need for additional digestion and ligation steps, limiting their efficiency and scalability for producing mutagenized nucleic acid molecules suitable for direct transformation into bacteria.
Innovation Solution
A method involving the synthesis of a single-stranded mutagenic primer from a template nucleic acid molecule, followed by annealing and complementary strand synthesis to produce a circular-form nucleic acid molecule containing mutations, which can be directly transformed into bacteria without further modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If double-stranded PCR-based mutagenesis is used, then mutations can be introduced into DNA, but self-annealing of template strands occurs reducing reaction efficiency
Solution Approach 1:
The invention extracts only the necessary single strand from the double-stranded PCR product to serve as the mutagenic primer. By separating and using only one strand containing the desired mutation, the method eliminates the self-annealing problem that occurs when both strands are present in the template, while still achieving effective mutation introduction.
Solution Approach 2:
Instead of using double-stranded DNA as the starting material for mutagenesis (conventional approach), the invention inverts the approach by using single-stranded DNA as both the template and the source of the mutagenic primer. This inversion eliminates the self-annealing issue inherent in double-stranded approaches.
2Reliability
If PCR-based mutagenesis is used, then mutations are introduced, but additional digestion and ligation steps are required
Solution Approach 1:
The invention merges the mutagenesis function with the cloning function into a single integrated process. The single-stranded mutagenic primer contains both the mutation and the necessary elements for direct circularization and transformation, eliminating the need for separate digestion and ligation steps that are required in conventional PCR-based mutagenesis.
Solution Approach 2:
The mutagenic primer in this invention serves multiple functions simultaneously: it introduces the mutation, provides the template for circularization, and enables direct transformation into bacteria. This multi-functionality eliminates the need for separate specialized steps for each function that are required in conventional methods.
3Productivity
If double-stranded template is used in PCR, then amplification occurs, but high error rates are introduced
Solution Approach 1:
The invention inverts the conventional PCR approach by using single-stranded DNA instead of double-stranded DNA as the template. This inversion prevents the accumulation of errors that occurs in double-stranded PCR, as there is no second strand to serve as a template for error propagation, while still allowing amplification to occur.
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 reduces self-annealing issues, minimizes error introduction, and allows for efficient, scalable production of mutagenized DNA that can be directly used in bacterial transformation, enhancing protein expression and screening applications.
Implementation Method 1
annealing a single-stranded form of a mutagenic primer to a parent molecule
Implementation Method 2
synthesising a complementary strand from the mutagenic primer so as to produce a circular-form nucleic acid molecule
Data Source
AI summary
The present invention relates to a method of mutagenesis for introducing mutations into a molecule and, in particular, to methods that may be applied to populations of molecules for the generation or screening of libraries involving the mutation of multiple molecules.