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Assessing and engineering the IscB-ωRNA system for programmed genome editing.

Hao Yan1,2, Xiaoqing Tan3, Siyuan Zou1,2

  • 1Department of Chemistry, The University of Chicago, Chicago, IL, USA.

Nature Chemical Biology
|July 8, 2024
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Summary
This summary is machine-generated.

Researchers engineered IscB, an OMEGA RNA (ωRNA)-guided endonuclease, for enhanced in vivo genome editing in human cells. The improved OgeuIscB system shows increased DNA binding and editing efficiency, making it a potent tool for gene editing applications.

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Area of Science:

  • Molecular Biology
  • Genome Engineering
  • Biotechnology

Background:

  • IscB is an OMEGA RNA (ωRNA)-guided endonuclease and an evolutionary ancestor of Cas9.
  • IscB offers a compact size and mechanistic similarity to Cas9, making it attractive for in vivo genome editing.
  • Wild-type IscB-ωRNA systems exhibit limited activity in human cells, necessitating improvements for effective genome editing.

Purpose of the Study:

  • To enhance the activity and efficiency of the IscB-ωRNA system for human genome editing.
  • To engineer a more potent and specific genome editing tool based on the IscB endonuclease.

Main Methods:

  • Introduced eight amino acid substitutions into IscB to create the enhanced OgeuIscB variant.
  • Engineered ωRNA using structure-guided approaches.
  • Tested the OgeuIscB-ωRNA system across 26 target sites in human cells.
  • Analyzed DNA-binding affinity, insertion-deletion (indel) formation, base-editing frequencies, and off-target effects.

Main Results:

  • OgeuIscB demonstrated a fourfold increase in in vitro DNA-binding affinity compared to wild-type IscB.
  • Achieved a 30.4-fold improvement in indel formation efficiency in human cells.
  • Attained up to 87.3% indel and 62.2% base-editing frequencies across multiple target sites.
  • Identified an NARR target-adjacent motif (TAM) and specific R-loop nucleotides as key determinants for target selection.

Conclusions:

  • The engineered OgeuIscB-ωRNA system exhibits significantly enhanced potency and efficiency for human genome editing.
  • The system demonstrates programmability and sufficient specificity for therapeutic and research applications.
  • OgeuIscB-ωRNA represents a promising alternative to existing genome editing technologies.