Genotyping Citrus tristeza virus Isolates by Sequential Multiplex RT-PCR and Microarray Hybridization in a...

Area of Science:

• Plant Virology
• Molecular Diagnostics
• Bioengineering

Background:

• Citrus tristeza virus (CTV) is a significant plant RNA virus with diverse genotypic groups.
• Accurate genomic information is crucial for effective CTV disease management strategies.
• Current RT-PCR methods for CTV detection can be improved for greater accuracy.

Purpose of the Study:

• To develop and pilot a miniaturized lab-on-chip (LoC) protocol for Citrus tristeza virus (CTV) strain identification.
• To enable rapid analysis of CTV genotype diversity in field isolates.
• To differentiate endemic from non-endemic CTV isolates.

Main Methods:

• A sequential multiplex RT-PCR reaction combined with microarray hybridization on a silicon LoC device.
• Design of 12 primers and 44 probes targeting variable genomic regions of 6 CTV genes (5'UTR, ORF1a, ORF1b, p33, p20, p23).
• Analysis based on the pattern of probe hybridizations to identify CTV genotypes.

Main Results:

• The LoC system successfully analyzed genotype diversity in CTV isolates.
• The protocol demonstrated the capability to distinguish between different CTV genotypic groups.
• The method allows for rapid identification of CTV strains based on probe hybridization profiles.

Conclusions:

• The developed LoC-based multiplex RT-PCR and microarray hybridization protocol offers a rapid and accurate method for CTV strain identification.
• This approach enhances genomic information availability for CTV disease management.
• The system has the potential to improve the surveillance and control of CTV outbreaks.