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Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
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Topology-Engineered Guide RNAs for Programmable Control of CRISPR/Cas Activity.

Liang Cheng1,2

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Summary

Topology-engineered guide RNAs (TE-gRNAs) offer precise control over CRISPR gene editing. These advanced RNA structures enable conditional and reversible editing, overcoming limitations of traditional methods for enhanced applications.

Keywords:
CRISPR/Cas systemsGenome editing controlGuide RNA engineeringRNA topologyTopology‐engineered guide RNAs

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Chemical Engineering

Background:

  • CRISPR/Cas systems offer powerful genome editing capabilities.
  • Achieving precise temporal and conditional control of CRISPR remains a significant challenge.
  • Traditional linear guide RNAs (gRNAs) present limitations in control, efficiency, and reversibility.

Purpose of the Study:

  • To introduce and review topology-engineered guide RNAs (TE-gRNAs) as an advanced solution for controlled CRISPR/Cas genome editing.
  • To highlight the structural diversity and functional advantages of TE-gRNAs.
  • To discuss the potential of TE-gRNAs in various biological and therapeutic applications.

Main Methods:

  • Engineering defined RNA topologies (polymeric, circular, dendrimer-like) for gRNAs.
  • Incorporating stimuli-responsive linkers and groups for external trigger control (e.g., light, chemical signals).
  • Evaluating TE-gRNAs for improved synthesis, stability, reduced off-target effects, and precise spatiotemporal control.

Main Results:

  • TE-gRNAs enable precise spatial and temporal control over CRISPR/Cas activity.
  • Defined topologies allow for reversible and programmable activation/deactivation of editing.
  • Engineered structures enhance synthesis feasibility, stability, and reduce off-target effects.

Conclusions:

  • TE-gRNAs represent a significant advancement in achieving dynamic and conditional genome editing.
  • Their unique structural properties offer unprecedented control over CRISPR systems.
  • TE-gRNAs hold broad potential for synthetic biology, functional genomics, and therapeutic interventions.