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CRISPR01:59

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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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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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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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Functional Assessment of BRCA1 variants using CRISPR-Mediated Base Editors
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Off-Target Editing by CRISPR-Guided DNA Base Editors.

SeHee Park1, Peter A Beal1

  • 1Department of Chemistry , University of California , One Shields Avenue , Davis , California 95616 , United States.

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DNA base editors precisely alter genomes without double-strand breaks, but recent studies reveal guide RNA-independent off-target DNA and RNA editing due to deaminase activity. Strategies to enhance base editor selectivity are discussed.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Base editing is a genome editing technology enabling precise single-nucleotide changes in DNA.
  • Cytosine base editors (CBEs) and adenine base editors (ABEs) utilize a Cas9 nickase fused to a deaminase enzyme, guided by an RNA molecule.
  • This method avoids double-strand DNA breaks, reducing unwanted insertions or deletions (indels) common in CRISPR-Cas nuclease systems.

Purpose of the Study:

  • To review the development of DNA base editors.
  • To discuss recently reported guide RNA-independent off-target editing activities of DNA base editors.
  • To explore strategies for improving the selectivity of base editing technologies.

Main Methods:

  • Review of recent scientific literature on DNA base editing.
  • Analysis of reported off-target editing events.
  • Discussion of deaminase enzyme activity and guide RNA-independent mechanisms.

Main Results:

  • DNA base editors, while precise, can induce significant off-target edits in both DNA and RNA.
  • These off-target effects are primarily attributed to the inherent promiscuity of the deaminase enzymes, independent of guide RNA targeting.
  • The findings highlight potential limitations in the specificity of current base editing tools.

Conclusions:

  • Despite their advantages, DNA base editors exhibit off-target activity that requires careful consideration.
  • Understanding the deaminase-driven off-target mechanisms is crucial for improving base editor specificity.
  • Further development is needed to enhance the selectivity of base editing for safe and effective genome editing applications.