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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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Guanine-Quadruplex-Engineered crRNA Enables Light-Activated CRISPR/Cas12a System for Robust One-Pot Viral Assay.

Jinlian Du1, Jingjing Hu1, Jian An2

  • 1Key Laboratory of Chemical Biology & Traditional Chinese Medicine Research, Ministry of Education, Institute of Interdisciplinary Studies, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China.

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This study introduces a light-activated CRISPR-Cas12a system for enhanced nucleic acid detection. This novel approach significantly improves sensitivity and accuracy in diagnosing viral infections like EBV and IAV.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Diagnostics

Background:

  • CRISPR/Cas12a systems integrated with isothermal amplification offer streamlined nucleic acid detection.
  • However, inherent Cas12a activity can reduce amplification efficiency and detection sensitivity.
  • Aerosol contamination is a risk in conventional one-pot detection platforms.

Purpose of the Study:

  • To develop a light-activated CRISPR/Cas12a system for precise regulation of Cas12a activity.
  • To establish a one-pot detection platform with improved sensitivity and reduced interference.
  • To enhance nucleic acid detection for clinical diagnostics.

Main Methods:

  • Engineered crRNA with a 3'-terminal guanine-quadruplex (G4) motif for photoswitching.
  • Coupled the light-activated CRISPR/Cas12a system with recombinase polymerase amplification (RPA).
  • Evaluated detection sensitivity, specificity, and performance in clinical samples.

Main Results:

  • Achieved precise regulation of Cas12a activity through photoswitching G4 structures.
  • Demonstrated a one-pot detection platform with 2 orders of magnitude improvement in sensitivity (1 copy/μL).
  • Showcased comparable sensitivity and specificity to PCR for detecting Epstein-Barr virus (EBV) and Influenza A virus (IAV) in clinical samples.

Conclusions:

  • The light-activated CRISPR/Cas12a-RPA platform offers superior detection performance over traditional systems.
  • This technology provides a promising tool for sensitive and specific clinical diagnostics.
  • Precise control over Cas12a activity enhances nucleic acid detection efficiency and reliability.