Typing and subtyping influenza virus using DNA microarrays and multiplex reverse transcriptase PCR.

Area of Science:

• Molecular Biology
• Virology
• Biotechnology

Background:

• Influenza virus typing and subtyping are crucial for epidemiological surveillance and vaccine development.
• Current methods, while effective, can be time-consuming and require specialized expertise.

Purpose of the Study:

• To develop and validate a DNA microarray for rapid and accurate typing and subtyping of human influenza A and B viruses.
• To assess the performance of the microarray in differentiating influenza virus strains.

Main Methods:

• Preparation of a DNA microarray by spotting PCR-amplified and sequenced gene fragments (hemagglutinin, neuraminidase, matrix proteins) of influenza viruses.
• Hybridization of fluorescently labeled probes (Cy3/Cy5) to the microarray and scanning to determine binding sites.
• Application of multiplex PCR primers targeting influenza A and B strains for typing and subtyping of clinical isolates.

Main Results:

• The DNA microarray demonstrated perfect agreement between hybridization patterns and target DNA locations.
• High signal-to-background ratios (5–30) and minimal cross-hybridization were observed, requiring 100–150 bp homology for hybridization.
• The microarray successfully typed and subtyped previously unsequenced influenza virus isolates, confirming its utility.

Conclusions:

• DNA microarray technology offers a valuable supplementary tool for influenza virus diagnostics.
• This method enhances the capabilities of PCR-based diagnostic approaches for influenza surveillance.
• The developed microarray platform shows promise for routine clinical and research applications in virology.