A universal random DNA amplification and labeling strategy for microarray to detect multiple pathogens of aquatic...

Area of Science:

• Aquatic animal health
• Molecular diagnostics
• Pathogen detection

Background:

• Aquaculture faces significant threats from bacterial, fungal, and viral diseases.
• Early and accurate detection of multiple pathogens is crucial for disease management.

Purpose of the Study:

• To develop a DNA microarray capable of simultaneously detecting a broad range of bacterial and viral pathogens affecting aquatic animals.
• To evaluate different nucleic acid amplification and labeling methods for microarray-based pathogen detection.

Main Methods:

• Design and fabrication of a DNA microarray with oligonucleotide probes for 13 bacterial and 11 viral pathogens.
• Evaluation of multiplex PCR, phi29 DNA polymerase, and Klenow fragment-based methods for nucleic acid amplification and labeling.
• Hybridization of amplified pathogen DNA to the microarray for detection.

Main Results:

• The DNA microarray included probes for 13 bacterial and 11 viral pathogens, targeting specific sequences and chromosomal loci.
• Multiplex PCR yielded the most intense hybridization signals.
• The phi29 DNA polymerase method offered convenience and avoided primer bias, making it suitable for novel pathogen detection.
• The phi29 DNA polymerase-based microarray successfully detected multiple unknown pathogens in diseased fish and shrimp samples.

Conclusions:

• A DNA microarray coupled with the phi29 DNA polymerase amplification method provides a convenient and effective strategy for simultaneous detection of multiple aquatic animal pathogens.
• This approach has the potential to enhance disease surveillance and management in aquaculture.