Surface-Bound Transposome Library Prep Without PCR Bias
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current nucleic acid library preparation methods for next-generation sequencing (NGS) are inefficient, costly, and introduce bias due to PCR amplification, particularly in GC-rich regions, leading to gaps and reduced indel calling performance.
Innovation Solution
A method using transposome complexes immobilized on solid supports for fragmenting and tagging nucleic acids without PCR amplification, incorporating index sequences through tagmentation, extension, and ligation, thereby reducing bias and improving sequencing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If PCR amplification is used to generate nucleic acid libraries, then library yield is improved, but bias is introduced in GC-rich regions leading to gaps and reduced sequencing accuracy
Solution Approach 1:
The patent extracts and eliminates the PCR amplification step from the library preparation workflow. By using transposome complexes that directly fragment and tag native DNA molecules, the method removes the source of PCR-induced bias while maintaining sufficient library yield through efficient transposition-based enrichment
Solution Approach 2:
The transposome complexes perform both fragmentation and tagging functions simultaneously in a single step. The transposase enzyme naturally inserts adapter sequences at fragment ends during the tagmentation process, eliminating the need for separate PCR amplification steps to add adapters and generate sufficient library material
2Manufacturing precision
If multiple sample preparation steps are used to convert DNA into libraries, then library quality is improved, but preparation time and complexity increase
Solution Approach 1:
The patent merges fragmentation, adapter tagging, and library enrichment into a single transposition reaction step. The transposome complex simultaneously cleaves DNA at random positions and ligates adapter sequences to fragment ends, eliminating multiple separate preparation steps while maintaining library quality
Solution Approach 2:
The transposome complexes are pre-assembled with active transposase enzymes and adapter-containing transposons before the reaction. This preliminary preparation allows the tagmentation reaction to proceed efficiently in a single step without requiring sequential assembly of multiple components during the actual library preparation
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 method reduces bias, enhances indel calling performance, improves coverage in GC-rich regions, and shortens preparation time, producing consistent insert sizes and reducing the need for sample purification.
Implementation Method 1
an attachment polynucleotide including: (i) an attachment adaptor sequence hybridized to one of the two adaptor sequences
Implementation Method 2
a transposome complex comprising: (a) a transposase; (b) a first transposon; (c) a second transposon
Data Source
AI summary
The present disclosure relates to methods, compositions, and kits for generating a library of tagged nucleic acid fragments without using PCR amplification, including methods and compositions for fragmenting and tagging nucleic acids (e.g., DNA) using transposome complexes immobilized on solid support.