Barcode Nucleic Acid Assembly via Enzymatic Fragment Joining
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for nucleic acid synthesis face challenges in scalability, automation, speed, accuracy, and cost, particularly in assembling longer fragments and libraries with high variability, leading to inefficiencies and errors in nucleic acid assembly.
Innovation Solution
The method involves providing pairs of polynucleotides with specific terminal regions of sequence homology and contacting them with a reaction mixture containing exonuclease, endonuclease, polymerase, and ligase to assemble nucleic acids, using techniques such as Type IIS restriction endonuclease sites and self-cleaving peptides to facilitate assembly and error correction, enabling the synthesis of large libraries with high specificity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional nucleic acid synthesis methods are used, then assembly of short fragments on small scale is achievable, but scalability, automation, speed, accuracy, and cost are compromised
Solution Approach 1:
The patent divides the nucleic acid assembly process into modular enzymatic steps (exonuclease treatment, endonuclease processing, polymerase extension, ligase joining) that can be performed in a standardized reaction mixture. This segmentation enables high-throughput automation while maintaining precision through controlled sequential actions at each stage
Solution Approach 2:
The patent employs Type IIS restriction endonucleases that recognize specific DNA sequences and cut at defined distances from the recognition site, creating precise overhangs. This sequence-specific parameter control ensures high assembly accuracy while enabling automated processing of numerous fragments simultaneously
2Adaptability or versatility
If existing assembly methods are applied to large libraries with high variability, then library diversity is achieved, but error rates increase and assembly fidelity decreases
Solution Approach 1:
The patent incorporates proofreading polymerase activity that detects and corrects mismatched bases during the extension step. This feedback mechanism ensures that only correctly assembled nucleic acid fragments are amplified and carried forward, maintaining high fidelity even when assembling diverse libraries with varying sequences
Solution Approach 2:
The patent performs preliminary exonuclease treatment to create uniform 3' overhangs on all fragments before assembly. This preliminary标准化 processing ensures that all fragments are prepared in a consistent state, reducing errors that could arise from variable fragment ends and improving overall assembly reliability across diverse libraries
3Extent of automation
If manual nucleic acid assembly techniques are used, then small scale synthesis is feasible, but automation and scalability are limited
Solution Approach 1:
The patent combines multiple enzymatic functions (exonuclease, endonuclease, polymerase, and ligase activities) into a single standardized reaction mixture that can be applied uniformly across all fragments. This merging of functions into an integrated system enables automated processing while managing complexity through standardization rather than requiring separate manual steps for each enzyme
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 allows for the efficient assembly of thousands to millions of nucleic acids with high accuracy and low error rates, overcoming the limitations of existing methods by enabling scalable and automated synthesis of complex nucleic acid libraries with high variability.
Implementation Method 1
contacting the first plurality of polynucleotides and the second plurality of polynucleotides with a reaction mixture comprising an exonuclease, an endonuclease, a polymerase, and a ligase
Implementation Method 2
contacting the first plurality of polynucleotides and the second plurality of polynucleotides with a reaction mixture comprising an exonuclease, an endonuclease, a polymerase, and a ligase
Implementation Method 3
contacting the first plurality of polynucleotides and the second plurality of polynucleotides with a reaction mixture comprising an exonuclease, an endonuclease, a polymerase, and a ligase
Implementation Method 4
contacting the first plurality of polynucleotides and the second plurality of polynucleotides with a reaction mixture comprising an exonuclease, an endonuclease, a polymerase, and a ligase
Data Source
AI summary
Provided herein are methods, systems, and compositions for efficient nucleic acid assembly. Nucleic acid assembly may comprise assembly of variants comprising paired homology.