Circular Nucleic Acid Library Prep Without Ligase Steps
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Solution Overview
Problem
Next-generation sequencing techniques require improvements in sensitivity, accuracy, and cost efficiency, particularly in the methods for generating nucleic acid libraries.
Innovation Solution
The use of enzymes, such as protelomerase, to create circular nucleic acid molecules by cleaving and rejoining the ends of double-stranded nucleic acid molecules, eliminating the need for nucleic acid ligase and simplifying the library preparation process, which reduces the number of steps and time required for library generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional nucleic acid ligase is used to generate circular nucleic acid molecules, then the library preparation can be completed, but the process requires multiple steps including resynthesis and linearization, increasing the runtime and complexity
Solution Approach 1:
The patent extracts and eliminates the nucleic acid ligase step from the traditional library preparation workflow. By using protelomerase to directly circularize nucleic acid molecules without requiring ligase-mediated ligation, the method removes unnecessary intermediate steps including resynthesis and linearization, thereby reducing overall runtime and simplifying the process
Solution Approach 2:
Instead of using ligase to join nucleic acid ends in the traditional manner, the patent inverts the approach by using protelomerase to cleave and circularize the molecules directly. This inversion of the circularization mechanism eliminates the need for subsequent resynthesis and linearization steps, achieving faster library preparation
2Productivity
If traditional multi-step library preparation is used, then complete library generation is achieved, but the workflow becomes complex requiring resynthesis and linearization steps
Solution Approach 1:
The patent merges multiple separate steps (circularization, resynthesis, linearization) into a single integrated protelomerase-mediated circularization reaction. This consolidation eliminates the need for separate resynthesis and linearization steps, reducing the total number of operations while maintaining complete library generation capability
Solution Approach 2:
The method extracts and removes the complex resynthesis and linearization steps from the workflow by using protelomerase to directly generate circular molecules in one step, thereby simplifying the overall preparation protocol while preserving library generation completeness
3Reliability
If nucleic acid ligase is used for circularization, then circular molecules are formed, but additional reagents and steps are required increasing cost and complexity
Solution Approach 1:
The patent employs protelomerase, an enzyme that performs the circularization function efficiently and can be discarded after use, replacing the need for expensive and complex ligase systems along with their associated buffers, reagents, and multi-step protocols. This substitution simplifies the manufacturing process while maintaining reliable circular molecule formation
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 enhances the efficiency of nucleic acid library preparation by reducing the runtime to as little as 5 minutes or less, simplifies the workflow, and eliminates the need for resynthesis and linearization steps, while ensuring both forward and reverse sequences are included in the circular nucleic acid molecules.
Implementation Method 1
contacting the joint double-stranded nucleic acid molecule to an enzyme to form the circular nucleic acid molecule
Data Source
AI summary
Provided herein are methods for generating circular nucleic acid molecules and circular nucleic acid libraries. The methods can be used to generate clonal populations of target nucleic acid molecules for downstream applications such as sequencing.