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CRISPR01:59

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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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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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CRISPR/Cas13a: Compensatory Target Activation Mechanism.

Bowen Jiang1,2, Tenghua Zhang1,2, Yao Lu1,2

  • 1International Joint Laboratory of Catalytic Chemistry, Innovation Institute of Carbon Neutrality, Department of Chemistry, College of Sciences, Shanghai University, Shanghai, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 9, 2026
PubMed
Summary

CRISPR/Cas13a-CTAM enhances RNA detection by using two short RNA effectors, enabling sensitive identification of ultra-short targets as low as 13 nucleotides. This breakthrough improves RNA diagnostics and biosensor development.

Keywords:
CRISPR/Cas13aCRISPR/Cas13a‐CTAMcompensatory target activationdouble‐effectorimmobilized Cas13a

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Biochemistry

Background:

  • CRISPR/Cas13a systems are vital for RNA diagnostics but are limited by the need for long RNA targets (>20 nt).
  • This limitation restricts sensitivity and flexibility in detecting specific RNA sequences.

Purpose of the Study:

  • To develop a novel CRISPR/Cas13a system, CRISPR/Cas13a-CTAM, that overcomes the limitations of target length.
  • To enhance sensitivity, target flexibility, and mismatch discrimination in RNA detection assays.

Main Methods:

  • CRISPR/Cas13a-CTAM utilizes a compensatory target activation mechanism with two independently programmable short RNA effectors.
  • This approach functionally decouples allosteric activation and binding stabilization for synergistic Cas13a activation.
  • Methods included assessing detection limits, sensitivity, mismatch discrimination, dual-target detection, and surface immobilization for electrochemical sensing.

Main Results:

  • CRISPR/Cas13a-CTAM successfully detects ultra-short RNA targets down to 13 nt, expanding the detectable range.
  • Achieved a detection limit of 1 fM for a 13-nt RNA target, a tenfold improvement in sensitivity.
  • Demonstrated enhanced mismatch discrimination (sevenfold) and enabled simultaneous dual-target detection and in situ electrochemical miRNA detection.

Conclusions:

  • CRISPR/Cas13a-CTAM offers a sensitive and programmable platform for RNA diagnostics, overcoming the requirement for long RNA targets.
  • The system facilitates advanced biosensor development, including functional immobilization of Cas13a for in situ detection.
  • This technology significantly broadens the applications of CRISPR/Cas13a in molecular diagnostics and beyond.