TASPERT: Target-Specific Reverse Transcript Pools to Improve HTS Plant Virus Diagnostics.

Area of Science:

• Plant pathology
• Molecular diagnostics
• Bioinformatics

Background:

• High-throughput sequencing (HTS) is crucial for plant quarantine diagnostics, enabling broad pathogen detection.
• Current HTS methods face limitations in sensitivity, with a higher Limit of Detection (LoD) than PCR, risking false negatives for low-titer pathogens.
• Existing enrichment strategies for HTS, like rRNA depletion or nucleic acid extractions, are often costly and time-consuming.

Purpose of the Study:

• To develop a faster, cost-effective method to lower the HTS Limit of Detection (LoD) for plant pathogens.
• To present TArget-SPecific Reverse Transcript (TASPERT) pool as an alternative enrichment strategy for HTS-based diagnostics.
• To demonstrate TASPERT's superiority over conventional library preparation methods.

Main Methods:

• Development of the TArget-SPecific Reverse Transcript (TASPERT) pool technique.
• Utilizing pooled, pathogen-specific reverse primers for double-stranded cDNA synthesis.
• Comparative analysis of TASPERT against standard methods (oligodT, random 6-mer, 20-mer) for metagenomic library generation.

Main Results:

• TASPERT significantly enriches samples for target RNA viruses by using pathogen-specific primers.
• The method achieves a lower HTS Limit of Detection (LoD), comparable to or better than PCR.
• TASPERT demonstrated superior performance in generating metagenomic libraries containing the target pathogen compared to other methods.

Conclusions:

• TASPERT pool offers a faster and more cost-effective approach to enhance HTS sensitivity in plant diagnostics.
• This technique addresses the challenge of low-titer pathogen detection, reducing the risk of false negatives.
• TASPERT represents a significant advancement for sensitive and efficient molecular diagnostics in plant quarantine.