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Double stranded scission of DNA directed through sequence-specific R-loop formation

R Landgraf1, C H Chen, D S Sigman

  • 1Department of Biological Chemistry, School of Medicine, University of California-Los Angeles 90024-1570, USA.

Nucleic Acids Research
|September 11, 1995
PubMed
Summary
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This study introduces a novel DNA cleavage method using RNA-guided R-loops. This technique enables precise DNA cutting at specific sequences in large DNA molecules, offering new possibilities for genetic engineering.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • R-loop formation using short RNAs offers a flexible method for sequence-specific DNA targeting.
  • Stabilized R-loops create single-stranded DNA (ssDNA) suitable for enzymatic cleavage.

Purpose of the Study:

  • To investigate the use of R-loop formation for sequence-specific double-stranded DNA (dsDNA) scission.
  • To evaluate the method's efficacy on various DNA sizes, including large plasmids.

Main Methods:

  • Formation of R-loops using short RNAs (approx. 100 nt) for sequence-specific DNA binding.
  • Stabilization of R-loops with glyoxal and subsequent RNA removal via RNase treatment.
  • Enzymatic cleavage of the resulting ssDNA bubble using attenuated micrococcal nuclease.

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Main Results:

  • Quantitative scission of 3-5 kb plasmids was achieved.
  • Specific excision of a large DNA segment (approx. 120 kb) from a P1 plasmid was demonstrated, showcasing applicability to larger DNA molecules.

Conclusions:

  • This R-loop-based method provides a robust and sequence-specific approach for DNA cleavage.
  • The technique is effective for both small and large DNA fragments, with potential applications in genome engineering and manipulation.