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Prime assembly with linear DNA donors enables large genomic insertions.

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Prime assembly (PA) enables large DNA insertions for genome engineering. This method efficiently inserts large DNA fragments using overlapping templates, improving gene insertion without double-stranded DNA breaks.

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Area of Science:

  • Molecular Biology
  • Genome Engineering
  • Gene Therapy

Background:

  • Targeted insertion of large DNA fragments is crucial for genome engineering and gene therapy.
  • Current prime editing methods struggle with efficient insertion of DNA fragments larger than 400 base pairs.

Purpose of the Study:

  • To develop a novel approach for efficient insertion of large DNA fragments using prime editing.
  • To overcome the limitations of existing methods for large DNA insertions.

Main Methods:

  • Developed a prime assembly (PA) approach utilizing overlapping DNA fragments designed to anneal with twin prime editing (twinPE) generated flaps.
  • Administered an inhibitor of non-homologous end joining to enhance insertion efficiency and precision.
  • Demonstrated PA's ability to insert single or multiple overlapping DNA fragments ranging from 0.1 kb to 11 kb.

Main Results:

  • Successfully inserted large DNA fragments (0.1–11 kb) using the PA approach.
  • Observed enhanced efficiency and precision of insertions when using a non-homologous end joining inhibitor.
  • Showcased PA's independence from canonical homology-directed repair pathways and its ability to proceed in non-cycling cells.

Conclusions:

  • Prime assembly (PA) is an effective method for inserting large DNA fragments, ranging from 0.1 kb to 11 kb.
  • PA facilitates Gibson-like assembly within cells, enabling gene insertions without requiring double-stranded DNA breaks, recombinases, or homology-directed repair.
  • The developed method offers a promising advancement for genome engineering and gene therapy applications.