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Related Concept Videos

CRISPR01:59

CRISPR

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 Short...
CRISPR/Cas9 Genome Editing01:28

CRISPR/Cas9 Genome Editing

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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Single-Molecule Characterization of CRISPR-Cas12a for Amplification-Free Genetic Testing.

Hajime Shinoda1, Asami Makino1, Mami Yoshimura1

  • 1Molecular Physiology Laboratory, Pioneering Research Institute, RIKEN, Saitama 351-0198, Japan.

Analytical Chemistry
|July 2, 2026
PubMed
Summary

CRISPR-Cas12a shows promise for rapid, amplification-free DNA detection, achieving high sensitivity. However, significant off-target activation with genomic DNA presents a major challenge for reliable molecular diagnostics.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Biochemistry

Background:

  • CRISPR-Cas systems offer rapid and accurate genetic testing for various diseases.
  • Cas12a is an RNA-guided DNA-targeting nuclease widely used for DNA detection.
  • Detailed enzymatic properties of Cas12a are not fully understood.

Purpose of the Study:

  • To biophysically characterize Cas12a's catalytic behavior using single-molecule analysis.
  • To evaluate the feasibility and challenges of amplification-free DNA detection with Cas12a.
  • To assess Cas12a's protospacer adjacent motif (PAM) specificity, mismatch tolerance, and reaction kinetics.

Main Methods:

  • Systematic single-molecule analysis of Cas12a.
  • Utilized microchamber arrays for biophysical characterization.
  • Evaluated amplification-free DNA detection performance.

Main Results:

  • Cas12a demonstrated high activation efficiency towards target DNA.
  • Achieved a detection limit of 104 aM within 15 minutes for amplification-free detection.
  • Observed substantial nonspecific cross-reactivity with genome-length targets, especially mammalian DNA.

Conclusions:

  • Cas12a is feasible for rapid, amplification-free DNA detection with high sensitivity.
  • Off-target activation is a significant hurdle for reliable Cas12a diagnostic applications.
  • Improving Cas12a's target specificity is crucial for its future use in molecular diagnostics.