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Related Concept Videos

CRISPR/Cas9 Genome Editing01:28

CRISPR/Cas9 Genome Editing

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The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
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CRISPR01:59

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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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CRISPR and crRNAs02:53

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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
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Homologous Recombination02:31

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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Updated: Dec 13, 2025

Enhanced Genome Editing with Cas9 Ribonucleoprotein in Diverse Cells and Organisms
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Enhanced Genome Editing with Cas9 Ribonucleoprotein in Diverse Cells and Organisms

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CRISPR Guide RNA Design Guidelines for Efficient Genome Editing.

Patrick Schindele1, Felix Wolter1, Holger Puchta2

  • 1Botanical Institute, Karlsruhe Institute of Technology, Karlsruhe, Germany.

Methods in Molecular Biology (Clifton, N.J.)
|July 26, 2020
PubMed
Summary

CRISPR-Cas9 gene editing is versatile but predicting guide RNA efficiency is challenging. This review summarizes current knowledge on guide RNA design to improve genome editing outcomes.

Keywords:
CRISPRCRISPR prediction toolCas9Genome editingMismatch tolerancegRNA designgRNA secondary structure

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • The CRISPR-Cas9 system offers unprecedented ease and precision for genome editing.
  • Its application has expanded across diverse organisms for site-specific DNA modifications.
  • However, predicting the efficiency of guide RNAs (gRNAs) remains a significant hurdle.

Purpose of the Study:

  • To consolidate current knowledge on designing effective guide RNAs for CRISPR-Cas9.
  • To identify and discuss inconsistencies in gRNA design strategies across different experimental models.
  • To provide insights for optimizing gRNA selection to enhance genome editing success.

Main Methods:

  • Literature review of CRISPR-Cas9 applications and gRNA design principles.
  • Analysis of experimental data and predictive models for gRNA efficiency.
  • Comparative assessment of gRNA design tools and methodologies.

Main Results:

  • CRISPR-Cas9 system demonstrates broad applicability and ease of use for genome alteration.
  • Guide RNA efficiency prediction is an organism-independent challenge impacting experimental outcomes.
  • Discrepancies exist in current gRNA design recommendations across various experimental systems.

Conclusions:

  • Optimizing guide RNA design is crucial for maximizing the success of CRISPR-Cas9 experiments.
  • Further research is needed to reconcile differing experimental system requirements for gRNA design.
  • Standardized approaches to gRNA design could improve reproducibility and efficiency in genome editing.