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Ayouni K, Chouikha A, Khamessi O, Touzi H, Hammemi W, Triki H. Evidence of Circulation of Several HAV Genetic Variants and Emergence of Potential Antigenic Variants in an Endemo-Epidemic Country before Vaccine Introduction. Viruses 2021; 13:v13061056. [PMID: 34204862 PMCID: PMC8227776 DOI: 10.3390/v13061056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 05/20/2021] [Accepted: 05/27/2021] [Indexed: 11/21/2022] Open
Abstract
Similar to several other countries in the world, the epidemiology of hepatitis A virus changed from high to intermediate endemicity level in Tunisia, which led to the occurrence of outbreaks. This study aimed to determine the genetic and antigenic variability of HAV strains circulating in Tunisia during the last few years. Genotyping using complete VP1 gene and VP1-2A junction confirmed the predominance of genotype IA, with co-circulation of several genetic and antigenic variants. Phylogenetic analysis including Tunisian and strains from other regions of the world showed the presence of at least two IA-variants within IA subgenotype. Amino-acid analysis showed several mutations in or close to epitope regions in the VP1-region. This study provides a baseline on the genetic and antigenic variability of HAV circulating strains before the introduction of vaccination into the national immunization schedule.
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Affiliation(s)
- Kaouther Ayouni
- Laboratory of Clinical Virology, WHO Reference Laboratory for Poliomyelitis and Measles in the Eastern Mediterranean Region, Pasteur Institute of Tunis, University Tunis El Manar (UTM), Tunis 1002, Tunisia; (H.T.); (W.H.); (H.T.)
- Faculty of Sciences of Tunis, University of Tunis El Manar, Campus Universitaire, El Manar, Tunis 2092, Tunisia
- Correspondence: (K.A.); (A.C.); Tel.: +216-26-199-695 (K.A.); +216-98-528-682 (A.C.)
| | - Anissa Chouikha
- Laboratory of Clinical Virology, WHO Reference Laboratory for Poliomyelitis and Measles in the Eastern Mediterranean Region, Pasteur Institute of Tunis, University Tunis El Manar (UTM), Tunis 1002, Tunisia; (H.T.); (W.H.); (H.T.)
- Correspondence: (K.A.); (A.C.); Tel.: +216-26-199-695 (K.A.); +216-98-528-682 (A.C.)
| | - Oussema Khamessi
- Institut Pasteur de Tunis, Université de Tunis El Manar, LR11IPT08 Venins et Biomolecules Therapeutiques, Tunis 1002, Tunisia;
| | - Henda Touzi
- Laboratory of Clinical Virology, WHO Reference Laboratory for Poliomyelitis and Measles in the Eastern Mediterranean Region, Pasteur Institute of Tunis, University Tunis El Manar (UTM), Tunis 1002, Tunisia; (H.T.); (W.H.); (H.T.)
| | - Walid Hammemi
- Laboratory of Clinical Virology, WHO Reference Laboratory for Poliomyelitis and Measles in the Eastern Mediterranean Region, Pasteur Institute of Tunis, University Tunis El Manar (UTM), Tunis 1002, Tunisia; (H.T.); (W.H.); (H.T.)
| | - Henda Triki
- Laboratory of Clinical Virology, WHO Reference Laboratory for Poliomyelitis and Measles in the Eastern Mediterranean Region, Pasteur Institute of Tunis, University Tunis El Manar (UTM), Tunis 1002, Tunisia; (H.T.); (W.H.); (H.T.)
- Faculty of Medicine of Tunis, University of Tunis El Manar, 15 Rue Djebel Lakhdhar, La Rabta, Tunis 1007, Tunisia
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Shine PV, Shankar KM, Abhiman B, Sudheer NS, Patil R. Epitope mapping of the White Spot Syndrome Virus (WSSV) VP28 monoclonal antibody through combined in silico and in vitro analysis reveals the potential antibody binding site. Mol Cell Probes 2020; 50:101508. [PMID: 31935436 DOI: 10.1016/j.mcp.2020.101508] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Revised: 12/23/2019] [Accepted: 01/10/2020] [Indexed: 01/18/2023]
Abstract
White Spot Syndrome Virus (WSSV) infecting shrimp is an enveloped double-stranded DNA virus. The WSSV is a member of the genus Whispovirus. The envelope protein VP28 is the most investigated protein of WSSV. In the present study, the epitope mapping of the monoclonal antibody (MAb) C-33 was carried out. Based on the epitope mapping results, an antigen-antibody interaction model was derived. Peptide scanning and confirmation of epitopes of MAb C-33 were carried out using the sequence data. The MAb was reactive to the epitope of both recombinant VP28 and the whole virus. The results of the study indicated the presence of an epitope region. The epitope region is found positioned within two peptides, covering 13 amino acids. Framework and CDR (complementarity determining regions) of heavy and light chain (VH & VL) sequences showed identity to germline immunoglobulin sequences. The Web Antibody Modelling (WAM) selected for further evaluation based on a comparative analysis of WAM and Rosetta server-generated models of the Fv region. The docking study using WAM generated model revealed that the residues from LEU98 to GLY105 are active in antibody binding. The findings of this study could form a structural basis for further research in VP28 based diagnostics and therapeutics or vaccine discovery.
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Affiliation(s)
- P V Shine
- Aquatic Animal Health Laboratory, Department of Aquaculture, College of Fisheries, Mangalore, India
| | - K M Shankar
- Aquatic Animal Health Laboratory, Department of Aquaculture, College of Fisheries, Mangalore, India.
| | - B Abhiman
- Aquatic Animal Health Laboratory, Department of Aquaculture, College of Fisheries, Mangalore, India
| | - N S Sudheer
- Central Institute of Brackishwater Aquaculture, Chennai, India
| | - R Patil
- Aquatic Animal Health Laboratory, Department of Aquaculture, College of Fisheries, Mangalore, India
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Gauna A, Losada S, Lorenzo M, Toledo M, Bermúdez H, D'Angelo P, Sánchez D, Noya O. Use of Synthetic Peptides and Multiple Antigen Blot Assay in the Immunodiagnosis of Hepatitis C Virus Infection. Viral Immunol 2018; 31:568-574. [PMID: 30256730 DOI: 10.1089/vim.2018.0023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Acute hepatitis C virus (HCV) infection is usually asymptomatic, therefore, early diagnosis is rare. It may remain undiagnosed in individuals who progress to chronic infection, often until serious liver damage has developed. To incorporate the diagnosis of this viral disease in a multiple-diagnostic assay, we first analyzed by immunoinformatics the HCV subtype 1a polyprotein (specifically Core, E2, NS3, NS5A proteins) to select antigenic peptides to be tested initially by the Pepscan technique. Next, we performed the immunodiagnosis of HCV infection, using the Multiple Antigen Blot Assay (MABA). In 22 patients' sera included in this study, a 20-mer linear peptide belonging to the N-terminus of the worldwide conserved Core protein showed 100% sensitivity and specificity; other sequences showed different levels of antibody recognition. The use of MABA in combination with synthetic peptides as a source of multiple, specific, and nonexpensive antigens for other infectious diseases could represent a rapid, integrated, and inexpensive diagnostic methodology.
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Affiliation(s)
- Adriana Gauna
- 1 Programa de Doctorado en Biotecnología, Pontificia Universidad Católica de Valparaíso/Universidad Técnica Federico Santa María , Valparaíso, Chile
| | - Sandra Losada
- 2 Sección de Biohelmintiasis, Instituto de Medicina Tropical , Facultad de Medicina, Universidad Central de Venezuela, Caracas, Venezuela
| | - María Lorenzo
- 2 Sección de Biohelmintiasis, Instituto de Medicina Tropical , Facultad de Medicina, Universidad Central de Venezuela, Caracas, Venezuela
| | - Marilyan Toledo
- 3 Cátedra de Parasitología, Escuela de Medicina "Luis Razetti," Universidad Central de Venezuela , Caracas, Venezuela
| | - Henry Bermúdez
- 2 Sección de Biohelmintiasis, Instituto de Medicina Tropical , Facultad de Medicina, Universidad Central de Venezuela, Caracas, Venezuela
| | - Pierina D'Angelo
- 4 Laboratorio de Programas Especiales-Hepatitis y SIDA, Dpto de Virología, Gerencia Sectorial de Diagnóstico y Vigilancia Epidemiológica, Instituto Nacional de Higiene "Rafael Rangel ," Caracas, Venezuela
| | - Doneyla Sánchez
- 4 Laboratorio de Programas Especiales-Hepatitis y SIDA, Dpto de Virología, Gerencia Sectorial de Diagnóstico y Vigilancia Epidemiológica, Instituto Nacional de Higiene "Rafael Rangel ," Caracas, Venezuela
| | - Oscar Noya
- 2 Sección de Biohelmintiasis, Instituto de Medicina Tropical , Facultad de Medicina, Universidad Central de Venezuela, Caracas, Venezuela .,5 Centro para Estudios Sobre Malaria, Instituto de Altos Estudios "Dr. Arnoldo Gabaldón" Instituto Nacional de Higiene-Ministerio del Poder Popular para la Salud , Caracas, Venezuela
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Fraczyk J, Walczak M, Kaminski ZJ. New methodology for automated SPOT synthesis of peptides on cellulose using 1,3,5-triazine derivatives as linkers and as coupling reagents. J Pept Sci 2018; 24. [DOI: 10.1002/psc.3063] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 11/02/2017] [Accepted: 11/21/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Justyna Fraczyk
- Institute of Organic Chemistry, Lodz University of Technology; 90-924 Lodz Poland
| | - Małgorzata Walczak
- Institute of Organic Chemistry, Lodz University of Technology; 90-924 Lodz Poland
| | - Zbigniew J. Kaminski
- Institute of Organic Chemistry, Lodz University of Technology; 90-924 Lodz Poland
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Miles S, Navatta M, Dematteis S, Mourglia-Ettlin G. Identification of universal diagnostic peptide candidates for neglected tropical diseases caused by cestodes through the integration of multi-genome-wide analyses and immunoinformatic predictions. INFECTION GENETICS AND EVOLUTION 2017; 54:338-346. [DOI: 10.1016/j.meegid.2017.07.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 06/16/2017] [Accepted: 07/15/2017] [Indexed: 12/31/2022]
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da Silva Junior HC, da Silva ED, Lewis-Ximenez de Souza Rodrigues LL, Medeiros MA. Recombinant VP1 protein as a potential marker for the diagnosis of acute hepatitis A virus infection. J Virol Methods 2017; 245:1-4. [DOI: 10.1016/j.jviromet.2017.03.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2016] [Revised: 01/02/2017] [Accepted: 03/07/2017] [Indexed: 12/21/2022]
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