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Related Concept Videos

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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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Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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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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Multicopy Chromosomal Integration Using CRISPR-Associated Transposases.

Yiwen Zhang1,2, Xiaoman Sun3, Qingzhuo Wang1,2

  • 1Key Laboratory of Synthetic Biology, CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China.

ACS Synthetic Biology
|June 20, 2020
PubMed
Summary

Multicopy chromosomal integration using CRISPR-associated transposases (MUCICAT) enables precise control over gene copy number in bacteria. This method enhances enzyme expression and shows potential for broad bacterial applications.

Keywords:
CRISPR arrayCRISPR-associated transposasechromosomal integrationinsertion sequencemulticopy

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Area of Science:

  • Synthetic Biology
  • Microbial Engineering
  • CRISPR Technology

Background:

  • Controlling gene expression is key for engineering efficient bacterial biocatalysts.
  • Plasmid-based systems face challenges with genetic instability and precise copy number control.
  • Chromosomal integration offers advantages but traditional methods are laborious and limit gene dose variation.

Purpose of the Study:

  • To develop a novel method for achieving multicopy chromosomal integration in bacteria.
  • To enable precise control over gene expression cassette copy numbers.
  • To engineer bacterial strains with enhanced biocatalytic capabilities.

Main Methods:

  • Utilized CRISPR-associated transposases (MUCICAT) for targeted multicopy integration.
  • Designed crRNAs to target specific multicopy loci in the *Escherichia coli* genome.
  • Developed crRNA arrays for targeting multiple genomic loci to achieve varied gene doses.

Main Results:

  • Successfully generated *E. coli* strains with gene copy numbers up to 10 within 5 days, without selection pressure.
  • Achieved a 2.6-fold increase in glucose dehydrogenase expression using MUCICAT compared to plasmid-based systems.
  • Demonstrated the applicability of MUCICAT in *Tatumella citrea*, indicating broad potential.

Conclusions:

  • MUCICAT provides a robust and efficient platform for precise control of gene copy number in bacterial chromosomes.
  • This technology significantly enhances the expression of industrial enzymes.
  • MUCICAT is a versatile tool applicable across diverse bacterial species for metabolic engineering.