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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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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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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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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: Feb 19, 2026

Enhanced Genome Editing with Cas9 Ribonucleoprotein in Diverse Cells and Organisms
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Diverse Class 2 CRISPR-Cas Effector Proteins for Genome Engineering Applications.

Neena K Pyzocha1,2, Sidi Chen3,4,5,6,7,8

  • 1Broad Institute of MIT and Harvard , Cambridge, Massachusetts 02142, United States.

ACS Chemical Biology
|November 10, 2017
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CRISPR-Cas genome editing uses microbial immune systems for targeted DNA changes. This review details single-effector enzymes and their applications in genome engineering.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • CRISPR-Cas systems are microbial adaptive immune mechanisms.
  • These systems provide diverse functionalities for targeted nucleic acid cleavage.
  • CRISPR-Cas technologies have transformed molecular biology, enabling scalable DNA editing.

Purpose of the Study:

  • To review known single-effector CRISPR-Cas enzymes.
  • To discuss the engineering and use of these enzymes in mammalian cells.
  • To highlight the importance of unique enzyme properties for genome engineering applications.

Main Methods:

  • Literature review of CRISPR-Cas single-effector enzymes.
  • Analysis of enzyme characteristics and functionalities.
  • Discussion of genome engineering applications and targeting specificity.

Main Results:

  • Identification and characterization of various single-effector CRISPR-Cas enzymes.
  • Demonstration of their utility and engineered applications in mammalian cells.
  • Emphasis on how enzyme properties influence experimental outcomes and specificity.

Conclusions:

  • Single-effector CRISPR-Cas enzymes offer distinct advantages for genome engineering.
  • Understanding enzyme properties is crucial for optimizing experimental design and specificity.
  • These enzymes represent powerful tools for advancing molecular biology research.