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A Rapid, High-Throughput Method for the Construction of Mutagenesis Libraries.

Yuxin Lu1,2, Shuting Meng3, Xinyi Guan2,4

  • 1School of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing 210023, China.

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|November 27, 2025
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Summary

We developed a new method for creating mutant libraries using chip-based DNA synthesis, achieving high mutation coverage and efficiency for functional screening. This approach improves upon traditional mutagenesis techniques for synthetic biology applications.

Keywords:
high-throughputlibrary preparationnormalizationoligo-directed mutagenesissequencing

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Genomics

Background:

  • High-quality mutant libraries are crucial for large-scale functional screening in synthetic biology.
  • Traditional mutagenesis methods (random, saturation) have limitations in accuracy, bias, and coverage.
  • An ideal method requires controlled mutagenesis, comprehensive coverage, high throughput, and simplicity.

Purpose of the Study:

  • To develop a high-throughput, precisely controlled method for constructing mutagenesis libraries.
  • To evaluate the efficiency and accuracy of chip-based oligonucleotide synthesis for library construction.
  • To identify optimal polymerases and technical factors for high-fidelity library generation.

Main Methods:

  • Developed a high-throughput mutagenesis library construction method utilizing chip-based oligonucleotide synthesis.
  • Constructed a full-length amber codon scanning mutagenesis library for the *PSMD10* gene.
  • Evaluated five different DNA polymerases for amplification efficiency and chimera formation rates.
  • Analyzed unmapped reads to identify sources of errors, including oligonucleotide synthesis and PCR artifacts.

Main Results:

  • Achieved 93.75% mutation coverage for the full-length amber codon scanning mutagenesis library.
  • Identified KAPA HiFi HotStart, Platinum SuperFi II, and Hot-Start Pfu DNA Polymerase as preferred enzymes due to high efficiency and low chimera rates.
  • Highlighted oligonucleotide synthesis errors and PCR-induced chimeric sequences as key technical challenges.
  • Provided recommendations for improving efficiency and fidelity through refined PCR conditions and enhanced oligo synthesis quality control.

Conclusions:

  • Established an efficient, scalable, and precisely controlled strategy for constructing mutagenesis libraries for high-throughput functional research.
  • Emphasized the importance of using high-fidelity, low-bias polymerases for quality library construction.
  • The developed method offers a significant improvement over traditional mutagenesis techniques for applications in synthetic biology.