RT-QuIC Assays for Prion Disease Detection and Diagnostics.

Area of Science:

• Neuroscience
• Biochemistry
• Molecular Biology

Background:

• Prion diseases require sensitive and practical diagnostic tests for medicine, agriculture, and wildlife biology.
• Existing diagnostic methods for prion diseases have limitations in sensitivity, specificity, or practicality for routine use.

Purpose of the Study:

• To describe the current methodologies of Real-time quaking-induced conversion (RT-QuIC) assays for prion disease detection.
• To highlight technical considerations for executing, troubleshooting, and adapting RT-QuIC assays for new prion strains and sample types.

Main Methods:

• RT-QuIC assays utilize prion-seeded amyloid fibril formation of recombinant prion protein (rPrP^Sen).
• Thioflavin T fluorescence is used as a readout for amyloid fibril formation.
• Analysis of cerebrospinal fluid and nasal brushings are key sample types.

Main Results:

• RT-QuIC assays demonstrate high sensitivity (77-97%) and specificity (99-100%) for human sporadic Creutzfeldt-Jakob disease (sCJD) detection.
• Recent improvements have significantly enhanced assay sensitivity and reduced assay time to hours.
• Combining cerebrospinal fluid and nasal brushing analyses achieves nearly 100% diagnostic sensitivity and specificity.

Conclusions:

• RT-QuIC assays are highly sensitive and specific tools for diagnosing prion diseases in humans and animals.
• Assay improvements make RT-QuIC practical for routine applications in diverse fields.
• RT-QuIC methodology is adaptable to various prion strains and sample types, offering broad diagnostic potential.