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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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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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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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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Related Experiment Video

Updated: Nov 10, 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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Harnessing CRISPR-Cas system diversity for gene editing technologies.

Alexander Mckay1, Gaetan Burgio1

  • 1Department of Immunology and Infectious Diseases, John Curtin School of Medical Research, Australian National University, Canberra, ACT 2601, Australia.

Journal of Biomedical Research
|April 2, 2021
PubMed
Summary

Researchers are exploring diverse CRISPR-Cas systems to overcome limitations in current gene editing technologies. This involves discovering new RNA-guided endonucleases for improved DNA or RNA targeting and cleavage efficacy.

Keywords:
CRISPR-Cas systemsDNA repairDNA transposable elementsbiological evolutionclassificationgene editing

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • RNA-guided surveillance complexes like CRISPR-Cas9 have revolutionized gene modification and knockdown.
  • Existing gene editing technologies face constraints that limit their optimal application.

Purpose of the Study:

  • To review the limitations of current gene editing techniques.
  • To assess the potential of diverse CRISPR-Cas effectors for overcoming these limitations.

Main Methods:

  • Literature review of CRISPR-Cas systems.
  • Analysis of sequence targeting flexibility, cleavage efficacy, and specificity.

Main Results:

  • Identification of constraints in existing gene editing methods.
  • Evaluation of the diversity within CRISPR-Cas effector families.

Conclusions:

  • Exploiting the diversity of CRISPR-Cas effectors offers a promising methodology to surmount current gene editing limitations.
  • Further research into novel RNA-guided endonucleases is crucial for advancing gene editing applications.