Random Primer Sets to Reduce Chloroplast DNA Amplification
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Solution Overview
Problem
Existing DNA library preparation methods for genome analysis are inconvenient, lack reproducibility, and fail to effectively reduce amplification of chloroplast genome fragments, leading to increased complexity and cost.
Innovation Solution
A set of random primers is used in a nucleic acid amplification reaction with a regulated concentration, excluding specific sequences to suppress amplification of chloroplast genome fragments, facilitating a highly reproducible DNA library preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random primers are used for DNA library preparation, then the process becomes more convenient and reproducible, but amplification of chloroplast genome fragments increases
Solution Approach 1:
The patent removes specific primer sequences (TAAGAGACAGTG and TAAGAGACAGTGC) from the random primer set that cause excessive amplification of chloroplast genome fragments. By extracting and eliminating these harmful sequences while retaining other random primers, the method maintains reproducibility while reducing chloroplast amplification interference.
Solution Approach 2:
The patent optimizes the concentration of random primers to 4-200 microM (preferably 4-100 microM) to achieve high reproducibility while minimizing unwanted amplification. This parameter adjustment allows the method to function effectively without requiring nucleotide sequence information, simplifying the process while maintaining quality.
2Device complexity
If AFLP technique is used to reduce genomic complexity, then the complexity of genomic DNA is reduced, but the number of processes and cost increase
Solution Approach 1:
The patent eliminates the need for restriction enzyme treatment and adaptor ligation steps by using optimized random primers directly on genomic DNA. This extracts and removes the complex multi-step AFLP procedures while achieving similar genome complexity reduction through selective PCR amplification of genomic regions.
Solution Approach 2:
Instead of using restriction enzymes to cut DNA and then ligating adaptors (the conventional AFLP approach), the patent inverts the approach by using random primers to directly amplify genomic DNA regions of interest. This reversal simplifies the workflow while achieving comparable results.
3Device complexity
If RAPD technique is used for DNA marker analysis, then the process is simplified, but reproducibility of PCR amplification becomes poor
Solution Approach 1:
The patent modifies the RAPD technique by changing the primer sequences to exclude TAAGAGACAGTG and TAAGAGACAGTGC, and optimizes primer concentration to 4-200 microM. These parameter changes dramatically improve reproducibility while maintaining the simplicity of the RAPD approach, making it suitable for DNA marker analysis.
4Loss of information
If genomic analysis based on nucleotide sequence analysis is performed, then comprehensive analysis of genetic information is achieved, but the number of processes and cost increase
Solution Approach 1:
The patent uses random primers to amplify representative portions of the genome rather than sequencing the entire genome. This partial action approach provides sufficient genetic information for marker analysis and trait association studies without the excessive cost and complexity of whole-genome sequencing.
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 allows for a highly reproducible and convenient DNA library preparation by significantly reducing amplification of chloroplast genome fragments, thereby simplifying the process and reducing complexity and cost.
Implementation Method 1
conducting a nucleic acid amplification reaction in a reaction solution containing genomic DNA and a random primer selected from the set of random primers at high concentration
Implementation Method 2
a set of random primers comprising, as random primers, one or more oligonucleotides selected from among specific sequences
Data Source
AI summary
When preparing a DNA library via a nucleic acid amplification reaction using a random primer in a convenient and highly reproducible manner, amplification of DNA fragments derived from the chloroplast genome is reduced to a significant extent. A random primer comprises oligonucleotides selected from oligonucleotides group represented by TAAGAGACAGNN excluding those in which 2 bases at the 3′ terminus are TG and oligonucleotides group represented by TAAGAGACAGNNN excluding those in which 3 bases at the 3′ terminus are TGC.