A RT-ERA-CRISPR/Cas12a assay for rapid point-of-care duck hepatitis A virus detection
updated time：2026-01-16
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Title: A RT-ERA-CRISPR/Cas12a Assay for Rapid Point-of-Care Duck Hepatitis A Virus Detection
Impact Factor (IF): 4.2
Journal: Poultry Science
Research Team: Avian Disease Research Center, College of Veterinary Medicine, Sichuan Agricultural University
This study combined RT-ERA with the CRISPR/Cas12a system to develop a point-of-care (POCT) detection method for Duck Hepatitis A Virus Type 1 (DHAV-1). Two detection modes, namely fluorescence detection and lateral flow assay, were established. The method addresses the limitations of traditional detection approaches that rely on specialized equipment and professional personnel, providing a scientifically rigorous and practically viable new technical solution for on-site rapid diagnosis.
1. Technical Route and Experimental Procedures
The study established an integrated "sample-in, result-out" detection system. With the RT-ERA kit developed by GenDx Biotech as the core of isothermal amplification, the entire process achieves "single-tube closed operation and completion within 60 minutes", with the specific design as follows:
Target Efficient Amplification
Specific primers and crRNA were designed based on the conserved sequences of DHAV-1. The core amplification step adopted the RT-ERA kit from GenDx Biotech, which enables efficient amplification of trace amounts of viral RNA in samples into DNA within 20 minutes.
High-sensitivity Signal Detection
The amplification products were mixed with the CRISPR/Cas12a system. Upon recognition of the specific target sequence, Cas12a is activated to exert its trans-cleavage activity, which enables non-specific cleavage of the single-stranded DNA (ssDNA) reporter molecules in the system. With the fluorophores labeled on the reporter molecules (fluorescence-based method) or the combination of fluorophores and biotin (lateral flow assay), the results can be directly interpreted either by portable devices or with the naked eye.
2. Key Experimental Results
Excellent Sensitivity and Specificity
Leveraging the robust isothermal amplification capability of the RT-ERA kit from GenDx Biotech, the fluorescence-based detection mode achieved a limit of detection (LoD) as low as 10 copies/μL, which is far superior to that of conventional isothermal amplification technologies. Moreover, this assay generated specific signals exclusively for DHAV-1, without any cross-reactivity with 7 common avian pathogens including DHAV-3, Duck Circovirus, and Goose Parvovirus, thus effectively avoiding misdiagnosis.
Excellent Performance in Clinical Validation
Thirty-two clinical samples were tested using the fluorescence-based detection mode, exhibiting a concordance rate of 93.75% with RT-PCR (23 true positives and 7 true negatives). An additional 32 samples were analyzed via the lateral flow assay strip, achieving a concordance rate of 81.25%, which meets the requirement for naked-eye interpretation in primary on-site settings.
Outstanding Operational Convenience
No large-scale instruments are required throughout the process, and only constant-temperature equipment (or simple heat preservation devices) is needed. The complete workflow, from sample RNA extraction to result interpretation, can be completed within 60 minutes, which is fully compatible with non-laboratory scenarios.
3. Core Technical Advantages
Stable Isothermal Amplification Efficiency
The RT-ERA kit from GenDx Biotech enables high-efficiency reverse transcription and amplification within a wide temperature range of 37–42 °C without the need for complicated temperature cycling. It addresses the reliance of traditional PCR on sophisticated instruments, thus providing feasibility for POCT scenarios.
Excellent Compatibility and Specificity
This kit is seamlessly integrated with the CRISPR/Cas12a detection system. The amplification products can directly trigger the trans-cleavage activity of Cas12a without interference from non-specific amplification. Combined with specific primers, it further enhances the target recognition capability for DHAV-1.
Broad Scenario Adaptability
It not only supports quantitative fluorescence detection in laboratory settings, but also enables visual interpretation via lateral flow assay strips, which presents double bands for positive results and single band for negative results. This assay caters to both research and primary-level application needs.
4. Future Outlook
The RT-ERA kit from GenDx Biotech, which has demonstrated high-efficiency amplification and stable compatibility in this study, serves as a robust and reliable core component for the development of next-generation on-site point-of-care molecular diagnostic products. It is expected to play an increasingly important role in the field of public health security.
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