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Related Concept Videos

The Antiviral System of Bacteria and Archaea: CRISPR01:23

The Antiviral System of Bacteria and Archaea: CRISPR

CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this defense.

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Related Experiment Video

Updated: Jul 6, 2026

DNA Virus Detection System Based on RPA-CRISPR/Cas12a-SPM and Deep Learning
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Detection method for identifying duck hepatitis A virus 3 virulent and attenuated strains based on RPA CRISPR

Lei Chen1, Qiaoli Zhang1, Wenbo Sun2

  • 1Shandong Provincial Key Laboratory of Animal Resistance Biology, College of Life Sciences, Shandong Normal University, Jinan, Shandong, China.

Poultry Science
|May 21, 2025
PubMed
Summary

A new RPA-CRISPR method rapidly distinguishes virulent Duck Attenuating Virus type 3 (DHAV-3) from its attenuated vaccine strain. This innovation aids disease control and vaccine efficacy evaluation in duck farming.

Keywords:
DHAV-3 virulent and attenuated strainsRPA-CRISPRSingle-base recognition

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Area of Science:

  • Veterinary Virology
  • Molecular Diagnostics
  • Disease Control Strategies

Background:

  • Duck viral hepatitis, primarily caused by Duck Attenuating Virus type 3 (DHAV-3), poses significant economic challenges to the duck industry in China.
  • Existing DHAV-3 vaccines carry a risk of increased virulence, and traditional detection methods cannot reliably differentiate between wild and vaccine strains due to minimal genomic differences.
  • Accurate differentiation of virulent and attenuated DHAV-3 strains is essential for effective disease management, vaccine assessment, and monitoring viral evolution.

Purpose of the Study:

  • To develop a highly sensitive and rapid detection method capable of simultaneously identifying and distinguishing between DHAV-3 virulent strains and the SD70 attenuated vaccine strain.
  • To provide a novel strategy for differentiating closely related viral strains, addressing limitations in current diagnostic approaches.

Main Methods:

  • Development of a single-base recognition system utilizing Recombinase Polymerase Amplification (RPA) combined with CRISPR technology.
  • Specific identification of DHAV-3 virulent and attenuated strains based on single nucleotide polymorphisms (SNPs).
  • Validation of the method's sensitivity, specificity, and speed through laboratory testing and comparison with sequencing and commercial kits.

Main Results:

  • The developed RPA-CRISPR method achieved simultaneous detection and differentiation of DHAV-3 virulent and SD70 attenuated strains.
  • The assay demonstrated high sensitivity, detecting target genes at concentrations as low as 10^0 copies/μL within 35 minutes.
  • Results from sample analysis using the new method showed high concordance with established sequencing techniques and commercial diagnostic kits.

Conclusions:

  • The novel RPA-CRISPR based single-base recognition system offers a fast, simple, specific, and sensitive approach for detecting DHAV-3 virulent and attenuated strains.
  • This method provides a crucial tool for disease control, vaccine efficacy evaluation, and monitoring viral mutations in the duck farming industry.
  • The study lays a foundational technical framework for improved management of DHAV-3 related diseases.