Mem Inst Oswaldo Cruz, Rio de Janeiro, VOLUME 121 | 2026
Research Articles

Novel epitope-based diagnostic probes selected by phage display for the serological detection of HDV

Mariana Araújo Costa1,2,3,4,+, Rayany Cristina de Souza1,2, Tárcio Peixoto Roca5,6, Adrhyan Araújo6, Luiz Fellype Alves de Souza7, Rutilene Barbosa Souza7,8, Rafaela Sabatini3,4, Bruno Silva Andrade9, Iara Pereira Soares1, Douglas Carvalho Caixeta1,2, Marco Guevara-Vega1,2, Ildercílio Mota de Souza Lima4, Ana Maísa Passos-Silva6, Mario Machado Martins1, Abel Dib Rayashi1, Daniel Archimedes da Matta7, Deusilene Vieira6, Luiz Ricardo Goulart1†, Robinson Sabino-Silva1,2, Fabiana de Almeida Araújo Santos1

1Universidade Federal de Uberlândia, Instituto de Biotecnologia, Laboratório de Nanobiotecnologia Prof Dr Luiz Ricardo Goulart Filho, Uberlândia, MG, Brasil
2Universidade Federal de Uberlândia, Centro de Inovação em Diagnóstico Salivar e Nanobiotecnologia, Instituto de Ciências Biomédicas, Departamento de Fisiologia, Uberlândia, MG, Brasil
3Secretaria de Saúde do Estado do Acre, Laboratório Central de Saúde Pública do Acre, Rio Branco, AC, Brasil
4Universidade Federal do Acre, Laboratório de Biologia Celular e Molecular Aplicada, Rio Branco, AC, Brasil
5Fundação Oswaldo Cruz-Fiocruz, Laboratório de Hepatites Virais, Rio de Janeiro, RJ, Brasil
6Fundação Oswaldo Cruz-Fiocruz, Laboratório de Virologia Molecular, Porto Velho, RO, Brasil
7Fundação Hospital Estadual do Acre, Centro de Infectologia Charles Merieux & Laboratório Rodolphe Merieux, Rio Branco, AC, Brasil
8Universidade Federal da Bahia, Programa de Pós-Graduação em Medicina e Saúde, Salvador, BA, Brasil
9Universidade Estadual do Sudoeste da Bahia, Departamento de Ciências Biológicas, Laboratório de Bioinformática e Química Computacional, Jequié, BA, Brasil

DOI: 10.1590/0074-02760250343
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ABSTRACT

BACKGROUND Hepatitis delta virus (HDV) is associated with the worst prognosis among viral hepatitis infections; however, it remains largely underdiagnosed, particularly in endemic developing regions, underscoring the need for new, accessible serological methods for large-scale screening.
OBJECTIVES To develop HDV-mimetic molecules using phage display for application in immunodiagnostic platforms.
METHODS HDV-mimetic peptides were selected via phage display biopanning, sequenced and screened by phage-enzyme-linked immunosorbent assay (ELISA). Based on the sequences of these peptides, a recombinant protein (rHDV) was constructed and employed in an ELISA. The test was validated using 87 anti-HDV-positive samples and 93 hepatitis B virus (HBV) control samples collected from a public diagnostic laboratory in the Amazon region. Statistical analyses were performed to evaluate the diagnostic performance of the synthetic peptides and the recombinant protein.
FINDINGS Overall, rHDV exhibits a sensitivity of 74.71%, specificity of 97.85%, and area under the curve (AUC) of 0.8906. In HDV ribonucleic acid (HDV RNA)-positive patients, diagnostic performance improved, with a sensitivity of 88.0%, specificity of 98.92%, and AUC of 0.96.
MAIN CONCLUSIONS These findings highlight that the rHDV protein used in ELISA effectively discriminated HDV-infected individuals from patients monoinfected with hepatitis B. This demonstrates the potential of rHDV as an effective, rapid, and low-cost tool for HDV detection for broader HDV screening.

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Financial support: This work was supported by the National Institute of Science and Technology in Theranostics and Nanobiotechnology - INCT-Teranano, Brazil (CNPq/CAPES/FAPEMIG, CNPq: 403193/2022-2; FAPEMIG: APQ-03613-17).
†In memoriam
+ Corresponding author: mariana.araujo@ac.gov.br | ORCID https://orcid.org/0000-0001-9383-7106
Received 22 November 2025
Accepted 07 March 2026

HOW TO CITE
Costa MA, de Souza RC, Roca TP, Araújo A, de Souza LFA, Souza RB, et al. Novel epitope-based diagnostic probes selected by phage display for the serological detection of HDV. Mem Inst Oswaldo Cruz. 2026; 120: e250343.

HANDLING EDITOR
Alexandre J da Silva | ORCID https://orcid.org/0000-0002-0865-6421

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