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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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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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Type II and type V CRISPR effector nucleases from a structural biologist's perspective.

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CRISPR-Cas9 and CRISPR-Cpf1 nucleases are powerful tools for DNA editing. This review details their structure, function, and mechanisms in bacterial immunity and genomic engineering applications.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biochemistry

Background:

  • CRISPR-Cas9 and CRISPR-Cpf1 are programmable DNA endonucleases.
  • They are derived from bacterial adaptive immunity systems.
  • Their activity is constrained by Protospacer Associated Motifs (PAMs).

Purpose of the Study:

  • To review structural insights into Cas9 and Cpf1 function.
  • To explain the mechanisms of DNA targeting and cleavage.
  • To summarize developments in CRISPR-based genomic engineering.

Main Methods:

  • Structural biology analysis of Cas9 and Cpf1 complexes.
  • Biochemical studies of DNA binding and cleavage mechanisms.
  • Review of recent literature on CRISPR systems.

Main Results:

  • Detailed structural insights into R-loop formation and nucleic acid anchoring.
  • Explanation of DNA scanning, strand separation, and hybrid formation.
  • Elucidation of catalytic mechanisms for RuvC and HNH domains.

Conclusions:

  • Cas9 and Cpf1 are versatile nucleases with well-defined structural and mechanistic principles.
  • Understanding these mechanisms is crucial for advancing genomic engineering.
  • CRISPR technology has revolutionized the field of genetic manipulation.