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James W Nelson1,2,3, Peyton B Randolph1,2,3, Simon P Shen1,2,3

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Engineered prime editing guide RNAs (epegRNAs) with enhanced stability improve prime editing efficiency by 3-4 fold. This advancement enables more effective installation or correction of disease-relevant mutations in living cells.

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Area of Science:

  • Molecular Biology
  • Gene Editing Technologies

Background:

  • Prime editing is a versatile gene editing tool capable of precise DNA modifications.
  • Prime editing guide RNAs (pegRNAs) are crucial for directing prime editors to target sites.
  • Degradation of the 3' region of pegRNAs can significantly reduce prime editing efficiency.

Purpose of the Study:

  • To enhance the stability of pegRNAs and improve prime editing efficiency.
  • To investigate the impact of 3' terminal RNA structures on pegRNA stability and function.
  • To develop a computational tool for designing optimized engineered pegRNAs (epegRNAs).

Main Methods:

  • Incorporation of structured RNA motifs to the 3' terminus of pegRNAs.
  • Testing the efficiency and off-target activity of engineered pegRNAs (epegRNAs) in various cell lines and primary human fibroblasts.
  • Development of pegLIT, a computational tool for designing epegRNAs.

Main Results:

  • Engineered pegRNAs (epegRNAs) demonstrated a 3-4 fold increase in prime editing efficiency.
  • Enhanced stability of epegRNAs prevented degradation of the 3' reverse transcriptase template and primer binding site.
  • No increase in off-target editing activity was observed with epegRNAs.
  • epegRNAs successfully enhanced the efficiency of installing or correcting disease-relevant mutations.

Conclusions:

  • Structured RNA motifs at the 3' terminus of pegRNAs significantly enhance their stability and prime editing efficiency.
  • epegRNAs represent a robust improvement over standard pegRNAs for gene editing applications.
  • The developed pegLIT tool facilitates the design of highly efficient and specific epegRNAs for therapeutic applications.