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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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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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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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CIRCLE-Seq for Interrogation of Off-Target Gene Editing
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Off-target Effects in CRISPR/Cas9-mediated Genome Engineering.

Xiao-Hui Zhang1,2, Louis Y Tee3, Xiao-Gang Wang4

  • 1Guangdong Provincial Key Laboratory of Prevention and Control for Severe Clinical Animal Diseases, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.

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Summary

CRISPR/Cas9 genome editing faces challenges with high off-target mutations, impacting clinical uses. This review covers mechanisms, detection, and strategies to improve specificity for reliable genetic research and therapies.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • CRISPR/Cas9 is a powerful genome-editing tool used in various research areas.
  • High off-target mutation rates (≥50%) are a significant concern, particularly for therapeutic applications.
  • Off-target activity involves RNA-guided endonuclease (RGEN) induced mutations at unintended DNA sites.

Purpose of the Study:

  • To review the fundamental mechanisms of CRISPR/Cas9 off-target cutting.
  • To discuss methods for detecting these off-target mutations.
  • To explore strategies for minimizing unwanted cleavage in CRISPR/Cas9 systems.

Main Methods:

  • Literature review of CRISPR/Cas9 off-target effects.
  • Analysis of mechanisms causing unintended DNA modifications.
  • Compilation of techniques for off-target mutation detection.
  • Synthesis of strategies to enhance CRISPR/Cas9 specificity.

Main Results:

  • Off-target mutations arise from sequence homology and guide RNA characteristics.
  • Various methods exist for detecting off-target mutations, including whole-genome sequencing and targeted approaches.
  • Strategies like engineered Cas9 variants and optimized guide RNAs can reduce off-target activity.

Conclusions:

  • Improving CRISPR/Cas9 specificity is crucial for accurate genotype-phenotype correlations.
  • Faithful interpretation of genome-editing data relies on minimizing off-target effects.
  • Enhanced specificity will accelerate the clinical and basic science applications of CRISPR/Cas9 technology.