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A gradient phage-assisted continuous evolution method for screening suppressor tRNAs in Escherichia coli.

Fan Wang1, Li-Hua Liu2, Zhenyu Wang3

  • 1School of Tropical Agriculture and Forestry, Hainan University, Haikou, Hainan 570228, PR China; Tidetron Bioworks Technology (Guangzhou) Co., Ltd., Guangzhou Qianxiang Bioworks Co., Ltd., Guangzhou, Guangdong 510000, PR China.

New Biotechnology
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Summary

Engineered suppressor tRNAs can read through premature termination codons (PTCs) to treat genetic diseases. This study developed a novel directed evolution method to create effective suppressor tRNAs, enhancing readthrough efficiency.

Keywords:
Directed evolutionGradient biosensorsPremature termination codonsSuppressor tRNAs

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Genetics

Background:

  • Nonsense-mediated decay is a cellular surveillance mechanism that degrades mRNAs containing premature termination codons (PTCs).
  • Suppressor tRNAs can bypass PTCs, enabling the synthesis of full-length proteins, offering therapeutic potential for genetic diseases caused by PTCs.
  • Current methods for engineering suppressor tRNAs are limited, hindering their therapeutic applications.

Purpose of the Study:

  • To develop a novel directed evolution technology for engineering highly efficient suppressor tRNAs.
  • To evolve tRNA^Trp (UGG) capable of reading through the UGA stop codon in Escherichia coli.
  • To identify mutations responsible for enhanced readthrough efficiency.

Main Methods:

  • Phage-assisted continuous evolution (PACE) was employed for directed evolution.
  • Gradient biosensors featuring PTCs within the M13 gene III were utilized.
  • Massively parallel sequencing was used to analyze mutations in evolved tRNAs.

Main Results:

  • Successfully evolved tRNA^Trp (UGG) to read through the UGA stop codon in E. coli.
  • Identified that mutations predominantly occurred in the anticodon loop of the tRNA.
  • Two evolved suppressor tRNA^Trp (UGA) mutants demonstrated over fivefold increase in readthrough efficiency.

Conclusions:

  • The developed PACE-based directed evolution technology is effective for engineering suppressor tRNAs.
  • The evolved suppressor tRNAs show significant potential for treating genetic disorders caused by PTCs.
  • Further optimization could lead to clinical applications of suppressor tRNA technology.