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Related Concept Videos

CRISPR01:59

CRISPR

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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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CRISPR/Cas9 Genome Editing01:28

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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 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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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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Prokaryotic Transcriptional Activators and Repressors01:58

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Prokaryotic Transcriptional Activators and Repressors01:58

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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
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Updated: Jan 16, 2026

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A next-generation platform for highly optimized CRISPR-mediated transcriptional repression.

Andrew Kristof1, Krithika Karunakaran1, Yann Ferry2

  • 1School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA.

Journal of Biotechnology
|September 26, 2025
PubMed
Summary

Researchers engineered a superior CRISPR interference (CRISPRi) system for gene silencing. This novel dCas9-ZIM3-NID-MXD1-NLS repressor offers enhanced performance across various applications, improving mammalian gene regulation.

Keywords:
CRISPRDCas9-repressor fusionGene knockdownMeCP2Repressor domainTranscriptional repression

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Protein Engineering

Background:

  • CRISPR interference (CRISPRi) uses deactivated Cas9 fused to repressor domains for gene silencing.
  • Current CRISPRi systems show variable efficacy across different cell lines, gene targets, and guide RNAs.

Purpose of the Study:

  • To develop a highly optimized CRISPRi repressor for enhanced mammalian gene regulation.
  • To improve the consistency and potency of CRISPRi-based gene silencing.

Main Methods:

  • Protein engineering by truncating repressor domains (e.g., MeCP2) and identifying optimal functional units like NID.
  • Assembly and screening of combinatorial multi-domain fusion libraries for novel repressors.
  • Optimization of nuclear localization signal (NLS) configuration for improved knockdown efficiency.

Main Results:

  • An ultra-compact NCoR/SMRT interaction domain (NID) truncation enhanced CRISPRi knockdown by ~40% compared to canonical domains.
  • Four new repressor fusions were discovered through combinatorial library screening.
  • Optimized NLS configuration increased repressor knockdown efficiency by ~50%.
  • The dCas9-ZIM3-NID-MXD1-NLS system demonstrated superior gene silencing across diverse cell lines and targets.

Conclusions:

  • The novel dCas9-ZIM3-NID-MXD1-NLS system represents a significant advancement in CRISPRi technology for potent gene silencing.
  • The multi-domain engineering strategy provides a versatile framework for developing next-generation CRISPR tools.