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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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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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CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this...
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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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CRISPR-based technologies: prokaryotic defense weapons repurposed.

Rebecca M Terns1, Michael P Terns2

  • 1Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30602, USA.

Trends in Genetics : TIG
|February 22, 2014
PubMed
Summary

CRISPR-Cas systems, microbial immune tools, are reprogrammed for precise DNA and RNA targeting. These systems offer versatile genome editing and gene regulation applications in diverse organisms.

Keywords:
CRISPRCasRNA silencingbiotechnologygenome editingmetabolic engineering

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biotechnology

Background:

  • Prokaryotic microbes utilize CRISPR-Cas systems as adaptive immunity against viral infections.
  • These systems function via sequence-specific recognition and destruction of foreign nucleic acids (DNA or RNA).

Purpose of the Study:

  • To summarize advancements in repurposing CRISPR-Cas systems for targeted DNA and RNA manipulation.
  • To highlight the potential of CRISPR-Cas for genome editing and gene expression regulation.

Main Methods:

  • Reprogramming small guide RNAs within CRISPR-Cas complexes.
  • Utilizing Type II CRISPR-Cas systems for genome editing and gene regulation.
  • Developing Type III CRISPR-Cas systems for RNA targeting and gene knockdown.

Main Results:

  • Demonstrated efficiency and versatility of Type II CRISPR-Cas systems in various cell types and organisms.
  • Showcased potential for precise genome editing and specific gene expression regulation.
  • Progress in developing Type III systems for gene knockdown and metabolic engineering.

Conclusions:

  • CRISPR-Cas systems are powerful, adaptable tools for molecular biology applications.
  • Reprogrammable CRISPR-Cas technology offers significant potential in research and biotechnology.
  • Further development of RNA-targeting systems like Type III CRISPR-Cas will expand applications in gene function studies and metabolic engineering.