Oligonucleotide microarray-based detection and identification of 10 major tomato viruses

Area of Science:

• Plant Virology
• Molecular Diagnostics
• Agricultural Biotechnology

Background:

• Tomato viruses pose significant threats to global crop production.
• Accurate and rapid detection methods are crucial for disease management.
• Existing diagnostic tools may lack the capacity for simultaneous screening of multiple viruses.

Purpose of the Study:

• To develop a DNA microarray for the simultaneous detection, identification, differentiation, and genotyping of 10 major economically important tomato viruses.
• To design and validate 40-mer oligonucleotide probes for specific viral targets.
• To create a high-throughput diagnostic platform for tomato virus screening.

Main Methods:

• Design of a sectored oligonucleotide microarray chip (4 x 2K features) using the Combimatrix platform.
• Development of 279 specific 40-mer oligonucleotide probes targeting RNA and DNA viruses affecting tomato.
• Simultaneous hybridization of four samples per chip, with chip re-use for analysis of up to 16 samples.

Main Results:

• The microarray successfully detected and identified multiple RNA viruses, including Cucumber mosaic virus, Potato virus Y, and Tomato mosaic virus.
• Specific probes allowed for differentiation and genotyping of certain RNA viral strains.
• While Tomato yellow leaf curl viruses were detected, differentiation was limited using coat protein gene-based probes.
• Low background signals were observed in hybridization experiments.

Conclusions:

• The developed DNA microarray is a powerful tool for the simultaneous screening of major tomato viruses.
• The platform enables efficient detection, identification, and genotyping, aiding in disease management strategies.
• Further probe development may enhance the differentiation of single-stranded DNA viruses.