Development and validation of HIV-1 Multiplex Serology

Area of Science:

• Immunology
• Virology
• Epidemiology

Background:

• Human immunodeficiency virus-1 (HIV-1) infection causes immunosuppression, increasing risks for opportunistic infections and cancers.
• Accurate detection of HIV-1 antibody status is crucial for epidemiological studies, particularly concerning cancer development.
• Conventional serology requires a two-step screening and confirmation process, limiting high-throughput applications.

Purpose of the Study:

• To develop and validate a high-throughput multiplex serology assay for detecting HIV-1 antibody status.
• To assess the utility of simultaneous detection of antibodies against multiple HIV-1 antigens for epidemiological research.
• To evaluate the potential of identifying infection-associated antibody patterns for disease staging.

Main Methods:

• Recombinant expression of seven HIV-1 antigens as glutathione-S-transferase (GST) fusion proteins in E. coli.
• Immobilization of GST-fusion proteins onto distinct fluorescently coded bead sets for multiplexing.
• Simultaneous detection of serum or plasma antibodies targeting multiple HIV-1 antigens in a suspension array.
• Validation using 244 pre-determined reference sera, comparing results with conventional immunoassay methods.

Main Results:

• The HIV-1 Multiplex Serology assay demonstrated high performance, comparable to conventional methods.
• The multifunctional protein GAG was identified as a highly specific (99%) and sensitive (100%) marker for HIV-1 serostatus.
• HIV-1 infected individuals recognized a median of 4 antigens, indicating a broad immune response, while negative sera recognized 0.
• The assay eliminates the need for a two-step screening and confirmation approach.

Conclusions:

• HIV-1 Multiplex Serology offers a validated, high-throughput alternative for determining HIV-1 antibody status.
• This method facilitates large-scale epidemiological studies on HIV-1 and its association with cancer development.
• The ability to detect antibodies against multiple antigens may aid in identifying patterns related to disease progression.