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Cas12a-Activated Universal Field-Deployable Detectors for Bacterial Diagnostics.

Yun Sun1, Hong Liu1, Yuanyuan Shen1

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Summary

A novel Cas12a-activated universal field-deployable detector (CUFD) offers highly sensitive pathogen detection in blood. This paper-based assay achieves rapid, colorimetric results for multiple pathogens, even at low concentrations.

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Area of Science:

  • Biotechnology
  • Molecular Diagnostics
  • Biosensors

Background:

  • Field-deployable diagnostics are crucial for rapid disease analysis.
  • Existing methods often lack the sensitivity for low-abundance biomarkers.
  • Low sensitivity hinders the detection of rare pathogen DNA in clinical samples.

Purpose of the Study:

  • To develop a highly sensitive and rapid paper-based assay for pathogen detection.
  • To leverage the Cas12a collateral activity for enhanced diagnostic capabilities.
  • To create a field-deployable detector for multiple pathogen DNA targets.

Main Methods:

  • Integration of Cas12a enzyme's collateral activity into a paper-based assay.
  • Utilizing a fluorophore-labeled ssDNA reporter for colorimetric readout.
  • Development of a Cas12a-activated universal field-deployable detector (CUFD).

Main Results:

  • The CUFD assay demonstrated high sensitivity, detecting as low as 10 aM for *Shigella dysenteriae* DNA.
  • The assay successfully quantified seven different types of pathogens in blood samples.
  • No purification procedure was required for the blood samples, simplifying the process.

Conclusions:

  • The CUFD technique provides a sensitive and rapid method for pathogen detection.
  • This assay has significant potential for point-of-care applications.
  • The technology can be adapted for detecting various DNA and RNA targets.