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CRISPR RNA-guided integrases for high-efficiency, multiplexed bacterial genome engineering.

Phuc Leo H Vo1, Carlotta Ronda2, Sanne E Klompe3

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We developed an improved CRISPR-Cas system for precise, marker-free DNA integration in bacteria. This INTEGRATE system efficiently inserts large DNA sequences at specific sites, enabling advanced bacterial genome engineering.

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Area of Science:

  • Bacterial Genetics
  • Molecular Biology
  • Genome Engineering

Background:

  • Current methods for large DNA integration in bacteria are inefficient and complex.
  • Existing technologies often rely on recombination or multiple vectors, limiting multiplexing capabilities.

Purpose of the Study:

  • To introduce an optimized CRISPR-Cas based system for highly efficient and accurate site-specific DNA integration in bacteria.
  • To demonstrate the system's capability for large DNA insertions (up to 10 kb) and multiplexed genome modifications.

Main Methods:

  • Utilized an engineered Tn7-like transposon with a Type I-F CRISPR-Cas system for RNA-guided transposition.
  • Employed multi-spacer CRISPR arrays for simultaneous integration at multiple genomic loci.
  • Combined orthogonal integrases and recombinases for facile multi-loci deletions.

Main Results:

  • Achieved highly accurate, marker-free DNA integration of up to 10 kb at ~100% efficiency.
  • Demonstrated simultaneous multiplexed insertions in three genomic loci.
  • Showcased target- and species-specific integration in diverse bacterial species and complex communities.

Conclusions:

  • The optimized INTEGRATE system provides a versatile and efficient tool for kilobase-scale bacterial genome engineering.
  • This technology overcomes limitations of previous methods, enabling complex genomic modifications in various bacterial contexts.