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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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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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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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Updated: Apr 15, 2026

Using a Fluorescent PCR-capillary Gel Electrophoresis Technique to Genotype CRISPR/Cas9-mediated Knockout Mutants in a High-throughput Format
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High-throughput functional genomics using CRISPR-Cas9.

Ophir Shalem1, Neville E Sanjana1, Feng Zhang1

  • 1Broad Institute of MIT and Harvard, 7 Cambridge Center, Cambridge, Massachusetts 02142, USA; McGovern Institute for Brain Research, Department of Brain and Cognitive Sciences, and Department of Biological Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.

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Summary

CRISPR-Cas9 technology enables powerful genome-scale screens for discovering gene functions. This review covers knockout and transcriptional modulation strategies, comparing them with RNA interference for future applications.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Genomics

Background:

  • Forward genetic screens are essential for identifying and annotating gene functions.
  • RNA-guided CRISPR (clustered regularly interspaced short palindromic repeat)-Cas9 systems offer a powerful platform for unbiased, genome-scale phenotypic screening.

Purpose of the Study:

  • To review recent advancements in using Cas9 for genome-scale genetic screens.
  • To discuss strategies including gene inactivation (knockout) and transcriptional modulation.
  • To compare CRISPR-Cas9 screening with RNA interference (RNAi) and explore future directions.

Main Methods:

  • Utilizing CRISPR-Cas9 nuclease with genome-scale guide RNA libraries.
  • Implementing knockout approaches to inactivate specific genomic loci.
  • Employing strategies to modulate gene transcriptional activity.

Main Results:

  • Cas9-based screens provide efficient methods for functional genomics.
  • Both knockout and transcriptional modulation strategies are effective for large-scale screening.
  • CRISPR-Cas9 offers advantages over traditional RNAi screening in certain applications.

Conclusions:

  • CRISPR-Cas9 technology has revolutionized genome-scale screening for gene discovery.
  • Careful consideration of screen design is crucial for successful implementation.
  • Future applications hold significant promise for advancing biological research and therapeutic development.