Transposon End Compositions for PCR-Free DNA Fragment Tagging
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Solution Overview
Problem
Current methods for generating DNA fragment libraries for next-generation sequencing are inefficient, wasteful, and require expensive instruments, often resulting in non-representative DNA fragments and laborious, time-consuming procedures.
Innovation Solution
The use of transposase and transposon end compositions to fragment and tag DNA in vitro, generating 5′- and 3′-tagged DNA fragments without PCR amplification, suitable for next-generation sequencing and other nucleic acid analysis methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional methods (sonication, nebulization, enzymatic digestion) are used to fragment and tag DNA, then DNA fragments can be generated, but the process is time-consuming, requires expensive instruments, and produces non-representative fragments
Solution Approach 1:
The patent replaces mechanical fragmentation methods (sonication, nebulization) with a biochemical transposition system. The transposase enzyme catalyzes the insertion of transposon ends into target DNA, achieving fragmentation and tagging simultaneously without requiring expensive mechanical instruments. This substitution of mechanical systems with enzymatic biochemical processes directly resolves the contradiction between productivity and device complexity.
Solution Approach 2:
The patent introduces transposon end compositions as intermediary elements that carry tagging sequences. These transposon ends act as mediators between the transposase enzyme and the target DNA, enabling the transfer of tag domains to DNA fragments. This intermediary mechanism allows for efficient, instrument-free fragmentation and tagging while maintaining representativeness of the DNA fragments.
2Productivity
If traditional cloning and subcloning methods are used, then DNA fragments can be obtained, but the process is laborious and time-consuming
Solution Approach 1:
The patent segments the DNA library preparation process into a single in vitro transposition reaction that simultaneously achieves fragmentation, tagging, and representation of the original DNA. This eliminates the need for sequential cloning and subcloning steps, dramatically increasing throughput and reducing time loss. The segmented approach allows parallel processing of multiple DNA molecules in a single reaction.
Solution Approach 2:
The transposon end compositions are pre-designed to contain both the fragmentation function and the tagging function in advance. By incorporating the tag domains and transposition capability into the transposon ends before the reaction, the system performs multiple functions simultaneously without requiring subsequent steps. This preliminary preparation of functional elements eliminates time-consuming sequential operations.
3Quantity of substance
If existing tagging methods are used, then DNA fragments can be tagged, but the process is wasteful and requires large amounts of sample DNA
Solution Approach 1:
The patent changes the fundamental parameters of the tagging process by using transposase-catalyzed transposition instead of traditional enzymatic tagging methods. This parameter change enables the transfer of tag domains to DNA fragments with high efficiency and minimal DNA consumption. The transposition reaction's specificity and efficiency allow for accurate tagging using nanogram to microgram quantities of sample DNA, dramatically reducing waste compared to traditional methods that require larger amounts.
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 produces representative DNA fragments efficiently, requiring less sample and reducing the need for specialized instruments, while being faster and more cost-effective.
Implementation Method 1
incubating the target DNA with a transposase and a transposon end or transposon end composition comprising a transferred strand that has a tag domain in its 5' portion, under conditions wherein a transposition reaction is catalyzed by the transposase
Data Source
AI summary
The present invention provides methods, compositions and kits for using a transposase and a transposon end for generating extensive fragmentation and 5′-tagging of double-stranded target DNA in vitro, then using a DNA polymerase for generating 5′- and 3′-tagged single-stranded DNA fragments without performing a PCR amplification reaction, wherein the first tag on the 5′-ends exhibits the sequence of the transferred transposon end and optionally, an additional arbitrary sequence, and the second tag on the 3′-ends exhibits a different sequence from the sequence exhibited by the first tag. The method is useful for generating 5′- and 3′-tagged DNA fragments for use in a variety of processes, including processes for metagenomic analysis of DNA in environmental samples, copy number variation (CNV) analysis of DNA, and comparative genomic sequencing (CGS), including massively parallel DNA sequencing (so-called “next generation sequencing”).