Reverse transcription of an RNA genome from databasing paper (FTA(R))

Area of Science:

• Molecular Biology
• Virology
• Diagnostic Technologies

Background:

• RNA instability in solution hinders its use in routine diagnostics and sample transport.
• Developing stable RNA preservation methods is crucial for reliable pathogen detection.

Purpose of the Study:

• To evaluate a novel method for desiccated RNA storage and direct processing for diagnostics.
• To assess the feasibility of using FTA cards for coxsackievirus B4 (CVB-4) RNA preservation and analysis.

Main Methods:

• Desiccation-storage of CVB-4 RNA on FTA cards.
• Direct reverse transcriptase polymerase chain reaction (RT-PCR) analysis without RNA elution.
• Comparison of different RNA phase-trapping techniques (ethanol, phenol, buffers, lithium chloride).

Main Results:

• RT-PCR detection of viral RNA achieved high sensitivity (approx. 0.1 fg).
• Desiccation-storage on FTA cards maintained RNA integrity for weeks under ambient conditions.
• Whole blood minimally interfered with CVB-4 detection, within acceptable limits.

Conclusions:

• Desiccated RNA storage on FTA cards is a viable strategy for preserving RNA integrity.
• This approach simplifies RNA processing for diagnostics, especially for transporting infectious samples.
• The method provides a foundation for developing robust RNA-based pathogen diagnostic tools.