Mapping SARS-CoV-2 Antibody Epitopes in COVID-19 Patients with a Multi-Coronavirus Protein Microarray

Area of Science:

• Immunology
• Virology
• Biotechnology

Background:

• The COVID-19 pandemic necessitates understanding immune responses to SARS-CoV-2.
• Cross-reactivity with endemic coronaviruses is crucial for immunity assessment.

Purpose of the Study:

• To develop and utilize a multi-coronavirus protein microarray to map antibody reactivity in COVID-19 patients.
• To identify specific SARS-CoV-2 antigenic regions and assess cross-reactivity with other human coronaviruses.

Main Methods:

• Creation of a microarray with full-length proteins, fragments, and peptide libraries from SARS-CoV-2 and four other human coronaviruses.
• Application of sera from COVID-19 patients and unexposed individuals to the array.
• Comparison of array results with spike protein-specific IgG enzyme-linked immunosorbent assays (ELISAs) and microneutralization assays.

Main Results:

• High IgG, IgM, and IgA reactivity to SARS-CoV-2 structural and accessory proteins specific to COVID-19 patients.
• Identification of highly reactive antigenic regions within SARS-CoV-2 proteins.
• Significant cross-reactivity of COVID-19 patient antibodies with proteins from SARS-CoV, MERS-CoV, HCoV-NL63, and HCoV-OC43.

Conclusions:

• The multi-coronavirus protein microarray is an effective tool for mapping antibody responses to SARS-CoV-2.
• Findings highlight the importance of cross-reactivity in understanding natural and vaccine-induced immunity.
• The tool aids in studying viral evolution and developing effective COVID-19 vaccines and diagnostics.