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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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As the human population continues to grow and use resources, we must be mindful of our planet’s natural limits. Sustainable development provides a pathway to maintain and improve human life now while also ensuring that future generations will have the resources that they need. The long-term success of sustainability efforts rests on understanding the interplay between human actions and ecological systems.
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Hybridoma technology is used for the large-scale production of monoclonal antibodies. Monoclonal antibodies bind to only a single antigenic determinant or epitope. Such antibodies are used in research, diagnostics, and disease therapy. The hybridoma technology established in 1975 by Georges Köhler and Cesar Milstein was awarded the Nobel Prize in Medicine in 1984 for revolutionizing research and therapy.
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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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New Developments in CRISPR Technology: Improvements in Specificity and Efficiency.

Fatemeh Safari1,2,3, Safar Farajnia4, Younes Ghasemi5

  • 1Department of Medical Biotechnology, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran.

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|February 10, 2018
PubMed
Summary

CRISPR-Cas9 gene editing offers broad biological applications but faces challenges with off-target effects. This review details methods to optimize Cas9 specificity for safer therapeutic applications.

Keywords:
CRISPR-Cas systemsgene editingguide RNA (gRNA)mutationoff-target effectsingle-strand specific DNA and RNA endonucleases

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • RNA-guided endonucleases, like Cas9, represent a versatile genome editing technology with significant potential in biological research and therapeutic applications.
  • Despite its simplicity and broad applicability, off-target effects (unintended DNA cleavage) remain a major challenge for Cas9 endonuclease activity.
  • The review focuses on strategies to enhance the specificity of Cas9 for improved therapeutic outcomes.

Purpose of the Study:

  • To review methods for optimizing Cas9 specificity.
  • To discuss strategies for mitigating off-target effects in genome editing.
  • To highlight advancements in CRISPR technology for therapeutic applications.

Main Methods:

  • Development of optimized guide RNA (gRNA) design software.
  • Engineering of the Cas9 enzyme for enhanced specificity.
  • Improvement of off-target detection assays.

Main Results:

  • Various strategies have been developed to address the challenge of off-target effects.
  • Optimization of Cas9 specificity is crucial for advancing therapeutic applications.
  • Novel breakthroughs in CRISPR technology are continuously emerging.

Conclusions:

  • Optimizing Cas9 specificity is key to realizing the full therapeutic potential of CRISPR technology.
  • Continued research into CRISPR applications and breakthroughs will drive innovation in gene therapy.
  • Addressing off-target effects is paramount for the safe and effective clinical translation of genome editing tools.