Y-Shaped Linker Capture Library Construction Without Blocking Sequences
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional exon capture library construction methods face challenges such as reduced capture specificity due to non-target sequence binding, high costs, and complexity in blocking sequence design, especially in high-throughput sequencing, where multiple tag sequences are required, and the need for high initial DNA amounts for hybridization capture.
Innovation Solution
A method that constructs a capture library without PCR pre-amplification and omits the use of blocking sequences by connecting fragmented DNAs with a Y-shaped linker, allowing hybridization with a hybridization probe in the absence of a blocking sequence, which simplifies the process and reduces costs while maintaining capture efficiency and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blocking sequences are added to prevent non-target sequence binding during hybridization capture, then capture specificity is improved, but device complexity and cost increase due to separate design for each tag sequence
Solution Approach 1:
The patent extracts and removes the blocking sequence component from the hybridization capture system. By demonstrating that blocking sequences are not necessary for achieving specific capture, the invention eliminates the complexity of designing and implementing separate blocking sequences for each tag sequence, while maintaining capture specificity through optimized probe design and hybridization conditions
Solution Approach 2:
The patent creates a universal hybridization capture system that works across multiple tag sequences without requiring sequence-specific blocking sequences. The same probe and hybridization conditions can be used universally for different tag sequences, eliminating the need for customized blocking sequences for each application
2Reliability
If blocking sequences are used to prevent non-specific binding, then capture efficiency is improved, but cost increases due to additional reagents and complex procedures
Solution Approach 1:
The invention removes the blocking sequence reagent from the hybridization capture system, eliminating the cost associated with purchasing, storing, and preparing blocking sequences. The capture efficiency is maintained through optimized probe design that inherently prevents non-specific binding without requiring additional blocking reagents
Solution Approach 2:
The patent replaces the expensive and complex blocking sequence system with a simpler, more economical approach using standard probes and hybridization conditions. The solution uses readily available reagents and procedures that are less costly and easier to implement
3Quantity of substance
If PCR pre-amplification is performed to construct pre-library, then sufficient DNA amount for hybridization capture is achieved, but non-target sequences are captured together with target sequences, reducing capture specificity
Solution Approach 1:
The patent performs preliminary enrichment of target sequences before hybridization capture by optimizing the fragmentation and end-repair steps to generate sufficient library material. This preliminary action provides enough DNA for capture without requiring PCR pre-amplification, thereby preventing the formation of non-specific complexes that would reduce capture specificity
Solution Approach 2:
The invention changes the parameters of the library preparation process, specifically optimizing fragmentation size distribution and end-repair efficiency to generate sufficient library material without PCR amplification. By adjusting these parameters, the system achieves the required DNA amount while maintaining sequence specificity
4Quantity of substance
If high initial DNA amounts (500 ng or higher) are used for hybridization capture, then sufficient pre-library is obtained, but DNA loss during purification requires PCR amplification to compensate
Solution Approach 1:
The patent performs preliminary optimization of the ligation and purification steps to minimize DNA loss before hybridization capture. By improving the efficiency of these preliminary actions, sufficient library material is obtained without requiring high initial DNA amounts or PCR amplification to compensate for losses
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 enables efficient capture library construction with lower initial DNA amounts, reducing costs and simplifying the process, while achieving good coverage and uniformity, and is applicable to various sample types, including those with limited DNA content, without compromising capture efficiency or sequencing quality.
Implementation Method 1
connecting the fragmented DNAs with a Y-shaped linker to obtain a pre-library
Implementation Method 2
hybridizing the pre-library with a hybridization probe
Data Source
AI summary
The present invention provides a method for constructing a capture library, comprising the steps of: (1) obtaining fragmented DNAs; (2) connecting the fragmented DNAs with a Y-shaped linker to obtain a pre-library; (3) hybridizing the pre-library and a hybridization probe in the absence of a blocking sequence to obtain hybridization products; and (4) performing a PCR amplification on the hybridization products to obtain the capture library. The present invention also provides to a kit for carrying out the method.