Novel differential linear B‐cell epitopes to identify Zika and dengue virus infections in patients

• Published in: Clinical & translational immunology Vol. 8; no. 7; pp. e1066 - n/a
• Main Authors: Amrun, Siti Naqiah, Yee, Wearn‐Xin, Abu Bakar, Farhana, Lee, Bernett, Kam, Yiu‐Wing, Lum, Fok‐Moon, Tan, Jeslin JL, Lim, Vanessa WX, Watthanaworawit, Wanitda, Ling, Clare, Nosten, Francois, Renia, Laurent, Leo, Yee‐Sin, Ng, Lisa FP
• Format: Journal Article
• Language: English
• Published: Australia John Wiley & Sons, Inc 2019; John Wiley and Sons Inc; Wiley
• Subjects: Amino acids; Antibodies; Cell differentiation; Dengue fever; diagnostic; Enzyme-linked immunosorbent assay; Epitopes; flavivirus; Flow cytometry; Glycoproteins; Health care; Immunoglobulins; Infections; Laboratories; Lymphocytes B; Original; Outbreaks; Patients; Peptides; Serology; Software; Statistical analysis; Viral envelope proteins; Zika virus; United States > US; Singapore; epitopes; diagnostic; patients; flavivirus
• ISSN: 2050-0068; 2050-0068
• DOI: 10.1002/cti2.1066

Objectives Recent Zika virus (ZIKV) outbreaks challenged existing laboratory diagnostic standards, especially for serology‐based methods. Because of the genetic and structural similarity of ZIKV with other flaviviruses, this results in cross‐reactive antibodies, which confounds serological interpretations. Methods Plasma from Singapore ZIKV patients was screened longitudinally for antibody responses and neutralising capacities against ZIKV. Samples from healthy controls, ZIKV patients and DENV patients were further assessed using ZIKV and DENV peptides of precursor membrane (prM), envelope (E) or non‐structural 1 (NS1) viral proteins in a peptide‐based ELISA for epitope identification. Identified epitopes were re‐validated and diagnostically evaluated using sera of patients with DENV, bacteria or unknown infections from Thailand. Results Long‐lasting ZIKV‐neutralising antibodies were elicited during ZIKV infection. Thirteen potential linear B‐cell epitopes were identified, and of these, four common flavivirus, three ZIKV‐specific and one DENV‐specific differential epitopes had more than 50% sensitivity and specificity. Notably, ZIKV‐specific peptide 26 on domain I/II of E protein (amino acid residues 271–288) presented 80% sensitivity and 85.7% specificity. Importantly, the differential epitopes also showed significance in differentiating non‐flavivirus patient samples. Conclusion Linear B‐cell epitope candidates to differentiate between ZIKV and DENV infections were identified, providing the first step towards the design of a much‐needed serology‐based assay. Linear B‐cell epitope candidates to differentiate between Zika virus (ZIKV) and dengue virus (DENV) infections were identified, which includes four common flavivirus, three ZIKV‐specific and one DENV‐specific differential epitopes that showed more than 50% sensitivity and specificity. Notably, ZIKV‐specific peptide 26 on domain I/II of envelope (E) glycoprotein (amino acid residues 271–288) presented 80% sensitivity and 85.7% specificity. Importantly, the differential epitopes also showed significance in discriminating non‐flavivirus patient samples.