Simplified Genomic Library Construction via PCR
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Solution Overview
Problem
Current methods for constructing simplified genomic libraries are inefficient due to the need for enzyme digestion, high-quality DNA requirements, limited random coverage, cumbersome steps, high costs, and incompatibility with trace or free samples.
Innovation Solution
A method involving non-specific amplification of the whole genome using a first pair of primers followed by specific amplification with a second pair of primers, which simplifies the process, reduces costs, and allows for flexible target fragment selection without enzymatic cleavage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If enzyme digestion is used to obtain random fragments, then specific length fragments can be obtained, but the requirements for sample DNAs are high and the efficiency of constructing the library is low
Solution Approach 1:
The patent extracts and eliminates the enzyme digestion step from the library construction process. Instead of using restriction enzymes to cut DNA at specific sites, the method directly amplifies genomic DNA using PCR with adaptors, thereby removing the bottleneck caused by enzyme digestion while maintaining the ability to obtain fragments of specific lengths through PCR cycle control and adaptor design
Solution Approach 2:
The patent changes the fundamental parameter of fragment generation from enzymatic cleavage to thermal cycling amplification. By using PCR with controlled cycling parameters and adaptor sequences, the method achieves precise control over fragment length distribution without relying on restriction enzyme specificity, thereby improving both efficiency and flexibility
2Manufacturing precision
If multiple steps including enzyme digestion, interruption, ligation and PCR are used, then the library can be constructed with good coverage, but the cycle required for constructing the library is long
Solution Approach 1:
The patent merges multiple separate steps (enzyme digestion, adaptor ligation, and PCR amplification) into a single PCR-based workflow. The adaptors are designed to be incorporated during the PCR amplification process itself, eliminating the need for separate digestion and ligation steps, thereby dramatically reducing construction time while maintaining coverage quality
Solution Approach 2:
The patent incorporates adaptor sequences into the PCR primers themselves, performing the adaptor addition action preliminarily during primer design and synthesis. This eliminates the need for subsequent ligation steps, as the adaptors are already attached to the amplifying primers and are incorporated into the fragments during the first PCR cycles
3Reliability
If many reagents are required for constructing the library, then the library construction can be completed, but the cost is high
Solution Approach 1:
The patent creates multi-functional adaptors that serve multiple purposes: they provide PCR amplification capability, contain sequencing platform-specific sequences, include barcodes for sample multiplexing, and enable fragment size selection. This consolidation of multiple functions into single reagent molecules reduces the total number of different reagents needed while ensuring reliable library construction
Solution Approach 2:
The patent uses inexpensive PCR reagents and consumables instead of expensive enzymatic reagents. The method relies on standard PCR components (polymerase, dNTPs, buffers) and disposable plasticware, eliminating the need for expensive restriction enzymes, ligases, and column-based purification reagents, thereby significantly reducing overall construction cost
4Manufacturing precision
If the target fragments are strictly limited by the cleavage sequence of the endonuclease, then the enzyme digestion can be performed, but the flexible in the genome is poor and only short restricted fragments can be collected
Solution Approach 1:
The patent introduces dynamic control over fragment selection through adjustable PCR parameters. By modifying cycle number, temperature, and primer concentrations, the method can dynamically adjust which genomic regions are amplified and at what frequencies, enabling flexible targeting of both short and long fragments across the entire genome without being constrained by fixed enzymatic recognition sites
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 results in a cost-effective, efficient, and highly accurate simplified genomic library construction process that can handle various sample types, including trace samples, with flexible coverage control and reduced sequencing time.
Implementation Method 1
performing a non-specific amplification on a whole genome with a first pair of primers to obtain random amplified fragments
Implementation Method 2
performing a specific amplification on the random amplified fragments with a second pair of primers to obtain the simplified genomic library
Data Source
AI summary
Provided are a method and a kit for constructing a simplified genomic library. The method comprises: performing a non-specific amplification on a whole genome with a first pair of primers to obtain random amplified fragments; performing a specific amplification on the random amplified fragments with a second pair of primers to obtain the simplified genomic library.