Identification and testing of control peptides for antigen microarrays

Area of Science:

• Immunology
• Biotechnology
• Microarray Technology

Background:

• Peptide microarrays commonly use protein controls for antibody binding assessment.
• Human immunoglobulin controls show inconsistent performance on newer generation slides due to printing or degradation issues.
• Development of reliable control peptides is crucial for consistent microarray functionality.

Purpose of the Study:

• To identify and validate synthetic control peptides for peptide microarray slides.
• To overcome the limitations of inconsistent protein controls in newer microarray generations.
• To establish reliable controls for immune response assessment using peptide arrays.

Main Methods:

• Synthetic peptides spanning M. tuberculosis and Bordetella pertussis proteins were printed on microarray slides.
• Peptides were incubated with secondary antibodies and analyzed for mean response and coefficient of variation.
• Selected control peptides were tested on newly manufactured slides for performance validation.

Main Results:

• Three peptides each for TB and B. pertussis slides met criteria (mean response ≥ 5, CV < 15%).
• These identified peptides demonstrated consistently high responses on new slides, with median indices ranging from 4.5 to 9.5.
• Control peptide responses were used to normalize patient serum data on slides.

Conclusions:

• Synthetic control peptides can effectively replace inconsistent protein controls in peptide microarrays.
• Peptide microarrays with these controls can be stored at room temperature, enhancing field application.
• The methodology is applicable to peptide array-based immune response assessment for various diseases.