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A CRISPR-Cas12a-based universal rapid scrub typhus diagnostic method targeting 16S rRNA of Orientia tsutsugamushi
Bum Ju Park1,2, Sang Taek Heo3, Misun Kim3
1Department of Life Science, Gachon University, Seongnam-Si, Republic of Korea.
Abstract:
Scrub typhus is caused by Orientia tsutsugamushi infection and occurs frequently in an area called the Tsutsugamushi Triangle. Currently, there is no vaccine for O. tsutsugamushi, and its infection is treated with antibiotics such as doxycycline. Scrub typhus responds to effective treatment, and early treatment shortens the course of the disease, reduces mortality, and accelerates recovery. Therefore, it is important to rapidly diagnose O. tsutsugamushi infection to ensure successful outcomes. Here, we developed a CRISPR-Cas12a-based diagnostic method targeting the bacterial 16S rRNA to detect O. tsutsugamushi infection of all known genotypes. To reduce the possibility of contamination and increase field applicability, we designed the one-pot assay system in addition to conventional two-pot assay system. Using this method, we successfully detected up to 100 copies of in vitro transcribed O. tsutsugamushi 16S rRNA within 1 hour under isothermal conditions. In blood samples from patients confirmed to be infected with O. tsutsugamushi by nested PCR, the developed method exhibited a clinical sensitivity of 98% and high specificity. These data demonstrate that the presented method is applicable for the rapid and universal diagnosis of scrub typhus to facilitate timely and appropriate treatment.
Insights
A new CRISPR-Cas12a diagnostic tool rapidly detects Orientia tsutsugamushi, the bacteria causing scrub typhus. This universal assay enables early diagnosis for timely antibiotic treatment and improved patient outcomes.
Area of Science:
- Molecular Biology
- Infectious Diseases
- Diagnostics
Background:
- Scrub typhus, caused by Orientia tsutsugamushi, is prevalent in the Tsutsugamushi Triangle.
- No vaccine exists for O. tsutsugamushi; doxycycline is the primary antibiotic treatment.
- Rapid diagnosis is crucial for effective scrub typhus treatment, reducing mortality and accelerating recovery.
Purpose of the Study:
- To develop a novel CRISPR-Cas12a-based diagnostic method for universal detection of O. tsutsugamushi.
- To create a diagnostic assay applicable in field settings with reduced contamination risk.
Main Methods:
- A CRISPR-Cas12a system targeting the bacterial 16S rRNA gene was designed.
- Both conventional two-pot and a simplified one-pot assay formats were developed.
- The assay was validated using in vitro transcribed RNA and clinical blood samples.
Main Results:
- The CRISPR-Cas12a method successfully detected as few as 100 copies of O. tsutsugamushi 16S rRNA within one hour under isothermal conditions.
- The assay demonstrated high clinical sensitivity (98%) and specificity in patient blood samples.
- The one-pot assay design enhanced field applicability and reduced contamination risks.
Conclusions:
- The developed CRISPR-Cas12a assay provides a rapid, sensitive, and specific tool for diagnosing scrub typhus.
- This universal diagnostic method covers all known genotypes of O. tsutsugamushi.
- The assay facilitates timely and appropriate treatment, improving scrub typhus patient outcomes.
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