1
|
Valusenko-Mehrkens R, Schilling-Loeffler K, Johne R, Falkenhagen A. VP4 Mutation Boosts Replication of Recombinant Human/Simian Rotavirus in Cell Culture. Viruses 2024; 16:565. [PMID: 38675907 PMCID: PMC11054354 DOI: 10.3390/v16040565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Revised: 03/22/2024] [Accepted: 03/28/2024] [Indexed: 04/28/2024] Open
Abstract
Rotavirus A (RVA) is the leading cause of diarrhea requiring hospitalization in children and causes over 100,000 annual deaths in Sub-Saharan Africa. In order to generate next-generation vaccines against African RVA genotypes, a reverse genetics system based on a simian rotavirus strain was utilized here to exchange the antigenic capsid proteins VP4, VP7 and VP6 with those of African human rotavirus field strains. One VP4/VP7/VP6 (genotypes G9-P[6]-I2) triple-reassortant was successfully rescued, but it replicated poorly in the first cell culture passages. However, the viral titer was enhanced upon further passaging. Whole genome sequencing of the passaged virus revealed a single point mutation (A797G), resulting in an amino acid exchange (E263G) in VP4. After introducing this mutation into the VP4-encoding plasmid, a VP4 mono-reassortant as well as the VP4/VP7/VP6 triple-reassortant replicated to high titers already in the first cell culture passage. However, the introduction of the same mutation into the VP4 of other human RVA strains did not improve the rescue of those reassortants, indicating strain specificity. The results show that specific point mutations in VP4 can substantially improve the rescue and replication of recombinant RVA reassortants in cell culture, which may be useful for the development of novel vaccine strains.
Collapse
Affiliation(s)
| | | | | | - Alexander Falkenhagen
- Department of Biological Safety, German Federal Institute for Risk Assessment, 10589 Berlin, Germany; (R.V.-M.); (K.S.-L.); (R.J.)
| |
Collapse
|
2
|
de Sautu M, Herrmann T, Scanavachi G, Jenni S, Harrison SC. The rotavirus VP5*/VP8* conformational transition permeabilizes membranes to Ca2. PLoS Pathog 2024; 20:e1011750. [PMID: 38574119 PMCID: PMC11020617 DOI: 10.1371/journal.ppat.1011750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 04/16/2024] [Accepted: 03/04/2024] [Indexed: 04/06/2024] Open
Abstract
Rotaviruses infect cells by delivering into the cytosol a transcriptionally active inner capsid particle (a "double-layer particle": DLP). Delivery is the function of a third, outer layer, which drives uptake from the cell surface into small vesicles from which the DLPs escape. In published work, we followed stages of rhesus rotavirus (RRV) entry by live-cell imaging and correlated them with structures from cryogenic electron microscopy and tomography (cryo-EM and cryo-ET). The virus appears to wrap itself in membrane, leading to complete engulfment and loss of Ca2+ from the vesicle produced by the wrapping. One of the outer-layer proteins, VP7, is a Ca2+-stabilized trimer; loss of Ca2+ releases both VP7 and the other outer-layer protein, VP4, from the particle. VP4, activated by cleavage into VP8* and VP5*, is a trimer that undergoes a large-scale conformational rearrangement, reminiscent of the transition that viral fusion proteins undergo to penetrate a membrane. The rearrangement of VP5* thrusts a 250-residue, C-terminal segment of each of the three subunits outward, while allowing the protein to remain attached to the virus particle and to the cell being infected. We proposed that this segment inserts into the membrane of the target cell, enabling Ca2+ to cross. In the work reported here, we show the validity of key aspects of this proposed sequence. By cryo-EM studies of liposome-attached virions ("triple-layer particles": TLPs) and single-particle fluorescence imaging of liposome-attached TLPs, we confirm insertion of the VP4 C-terminal segment into the membrane and ensuing generation of a Ca2+ "leak". The results allow us to formulate a molecular description of early events in entry. We also discuss our observations in the context of other work on double-strand RNA virus entry.
Collapse
Affiliation(s)
- Marilina de Sautu
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts, United States of America
- Laboratory of Molecular Medicine, Boston Children’s Hospital, Boston, Massachusetts, United States of America
| | - Tobias Herrmann
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Gustavo Scanavachi
- Department of Cell Biology, Harvard Medical School, Boston, Massachusetts, United States of America
- Program in Cellular and Molecular Medicine, Boston Children’s Hospital, Boston, Massachusetts, United States of America
| | - Simon Jenni
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Stephen C. Harrison
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts, United States of America
- Laboratory of Molecular Medicine, Boston Children’s Hospital, Boston, Massachusetts, United States of America
- Howard Hughes Medical Institute, Harvard Medical School, Boston, Massachusetts, United States of America
| |
Collapse
|
3
|
Lee B, Kader MA, Alam M, Dickson DM, Harvey P, Colgate ER, Taniuchi M, Petri WA, Haque R, Kirkpatrick BD. Infant Non-Secretor Histoblood Group Antigen Phenotype Reduces Susceptibility to Both Symptomatic and Asymptomatic Rotavirus Infection. Pathogens 2024; 13:223. [PMID: 38535566 PMCID: PMC10974866 DOI: 10.3390/pathogens13030223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 02/22/2024] [Accepted: 02/28/2024] [Indexed: 04/01/2024] Open
Abstract
The infant non-secretor histoblood group antigen phenotype is associated with reduced risk of symptomatic rotavirus diarrhea, one of the leading global causes of severe pediatric diarrheal disease and mortality. However, little is known regarding the role of secretor status in asymptomatic rotavirus infections. Therefore, we performed a nested case-control study within a birth cohort study previously conducted in Dhaka, Bangladesh, to determine the association between infant secretor phenotype and the odds of asymptomatic rotavirus infection, in addition to the risk of rotavirus diarrhea, in unvaccinated infants. In the parent cohort, infants were enrolled in the first week of life and followed through the first two years of life with multiple clinic visits and active surveillance for diarrheal illness. Secretor phenotyping was performed on saliva. Eleven surveillance stools collected over the first year of life were tested for rotavirus by real-time RT-PCR, followed by conventional PCR and amplicon sequencing to identify the infecting P-type of positive specimens. Similar to findings for symptomatic diarrhea, infant non-secretors experienced significantly fewer primary episodes of asymptomatic rotavirus infection through the first year of life in a likely rotavirus P-genotype-dependent manner. These data suggest that non-secretors experienced reduced risk from rotavirus due to decreased susceptibility to infection rather than reduced infection severity.
Collapse
Affiliation(s)
- Benjamin Lee
- Department of Pediatrics, Vaccine Testing Center and Translational Global Infectious Diseases Research Center, Larner College of Medicine, University of Vermont, Burlington, VT 05405, USA
| | - Md Abdul Kader
- International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka 1212, Bangladesh; (M.A.K.); (M.A.); (R.H.)
| | - Masud Alam
- International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka 1212, Bangladesh; (M.A.K.); (M.A.); (R.H.)
| | - Dorothy M. Dickson
- Department of Microbiology and Molecular Genetics, Vaccine Testing Center and Translational Global Infectious Diseases Research Center, Larner College of Medicine, University of Vermont, Burlington, VT 05405, USA; (D.M.D.); (P.H.); (E.R.C.); (B.D.K.)
| | - Patrick Harvey
- Department of Microbiology and Molecular Genetics, Vaccine Testing Center and Translational Global Infectious Diseases Research Center, Larner College of Medicine, University of Vermont, Burlington, VT 05405, USA; (D.M.D.); (P.H.); (E.R.C.); (B.D.K.)
| | - E. Ross Colgate
- Department of Microbiology and Molecular Genetics, Vaccine Testing Center and Translational Global Infectious Diseases Research Center, Larner College of Medicine, University of Vermont, Burlington, VT 05405, USA; (D.M.D.); (P.H.); (E.R.C.); (B.D.K.)
| | - Mami Taniuchi
- Division of Infectious Diseases and International Health, University of Virginia, Charlottesville, VA 22903, USA; (M.T.); (W.A.P.J.)
| | - William A. Petri
- Division of Infectious Diseases and International Health, University of Virginia, Charlottesville, VA 22903, USA; (M.T.); (W.A.P.J.)
| | - Rashidul Haque
- International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka 1212, Bangladesh; (M.A.K.); (M.A.); (R.H.)
| | - Beth D. Kirkpatrick
- Department of Microbiology and Molecular Genetics, Vaccine Testing Center and Translational Global Infectious Diseases Research Center, Larner College of Medicine, University of Vermont, Burlington, VT 05405, USA; (D.M.D.); (P.H.); (E.R.C.); (B.D.K.)
| |
Collapse
|
4
|
Xia M, Huang P, Vago F, Kawagishi T, Ding S, Greenberg HB, Jiang W, Tan M. A Viral Protein 4-Based Trivalent Nanoparticle Vaccine Elicited High and Broad Immune Responses and Protective Immunity against the Predominant Rotaviruses. ACS NANO 2024; 18:6673-6689. [PMID: 38353701 DOI: 10.1021/acsnano.4c00544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
The current live rotavirus (RV) vaccines show reduced effectiveness in developing countries, calling for vaccine strategies with improved efficacy and safety. We generated pseudovirus nanoparticles (PVNPs) that display multiple ectodomains of RV viral protein 4 (VP4), named S-VP4e, as a nonreplicating RV vaccine candidate. The RV spike protein VP4s that bind host receptors and facilitate viral entry are excellent targets for vaccination. In this study, we developed scalable methods to produce three S-VP4e PVNPs, each displaying the VP4e antigens from one of the three predominant P[8], P[4], and P[6] human RVs (HRVs). These PVNPs were recognized by selected neutralizing VP4-specific monoclonal antibodies, bound glycan receptors, attached to permissive HT-29 cells, and underwent cleavage by trypsin between VP8* and VP5*. 3D PVNP models were constructed to understand their structural features. A trivalent PVNP vaccine containing the three S-VP4e PVNPs elicited high and well-balanced VP4e-specific antibody titers in mice directed against the three predominant HRV P types. The resulting antisera neutralized the three HRV prototypes at high titers; greater than 4-fold higher than the neutralizing responses induced by a trivalent vaccine consisting of the S60-VP8* PVNPs. Finally, the trivalent S-VP4e PVNP vaccine provided 90-100% protection against diarrhea caused by HRV challenge. Our data supports the trivalent S-VP4e PVNPs as a promising nonreplicating HRV vaccine candidate for parenteral delivery to circumvent the suboptimal immunization issues of all present live HRV vaccines. The established PVNP-permissive cell and PVNP-glycan binding assays will be instrumental for further investigating HRV-host cell interactions and neutralizing effects of VP4-specific antibodies and antivirals.
Collapse
Affiliation(s)
- Ming Xia
- Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio 45229, United States
| | - Pengwei Huang
- Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio 45229, United States
| | - Frank Vago
- Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, United States
| | - Takahiro Kawagishi
- Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri 63110, United States
| | - Siyuan Ding
- Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri 63110, United States
| | - Harry B Greenberg
- Departments of Medicine and Microbiology and Immunology Emeritus, Stanford University School of Medicine, Stanford, California 94305, United States
| | - Wen Jiang
- Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, United States
| | - Ming Tan
- Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio 45229, United States
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio 45229, United States
| |
Collapse
|
5
|
Carossino M, Vissani MA, Barrandeguy ME, Balasuriya UBR, Parreño V. Equine Rotavirus A under the One Health Lens: Potential Impacts on Public Health. Viruses 2024; 16:130. [PMID: 38257830 PMCID: PMC10819593 DOI: 10.3390/v16010130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 12/29/2023] [Accepted: 01/12/2024] [Indexed: 01/24/2024] Open
Abstract
Group A rotaviruses are a well-known cause of viral gastroenteritis in infants and children, as well as in many mammalian species and birds, affecting them at a young age. This group of viruses has a double-stranded, segmented RNA genome with high genetic diversity linked to point mutations, recombination, and, importantly, reassortment. While initial molecular investigations undertaken in the 1900s suggested host range restriction among group A rotaviruses based on the fact that different gene segments were distributed among different animal species, recent molecular surveillance and genome constellation genotyping studies conducted by the Rotavirus Classification Working Group (RCWG) have shown that animal rotaviruses serve as a source of diversification of human rotavirus A, highlighting their zoonotic potential. Rotaviruses occurring in various animal species have been linked with contributing genetic material to human rotaviruses, including horses, with the most recent identification of equine-like G3 rotavirus A infecting children. The goal of this article is to review relevant information related to rotavirus structure/genomic organization, epidemiology (with a focus on human and equine rotavirus A), evolution, inter-species transmission, and the potential zoonotic role of equine and other animal rotaviruses. Diagnostics, surveillance and the current status of human and livestock vaccines against RVA are also reviewed.
Collapse
Affiliation(s)
- Mariano Carossino
- Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA;
- Louisiana Animal Disease Diagnostic Laboratory, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Maria Aldana Vissani
- Escuela de Veterinaria, Facultad de Ciencias Agrarias y Veterinarias, Universidad del Salvador, Pilar, Buenos Aires B1630AHU, Argentina; (M.A.V.); (M.E.B.)
- Instituto de Virología, CICVyA, Instituto Nacional de Tecnología Agropecuaria (INTA), Buenos Aires B1686LQF, Argentina;
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires C1033AAJ, Argentina
| | - Maria E. Barrandeguy
- Escuela de Veterinaria, Facultad de Ciencias Agrarias y Veterinarias, Universidad del Salvador, Pilar, Buenos Aires B1630AHU, Argentina; (M.A.V.); (M.E.B.)
- Instituto de Virología, CICVyA, Instituto Nacional de Tecnología Agropecuaria (INTA), Buenos Aires B1686LQF, Argentina;
| | - Udeni B. R. Balasuriya
- Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA;
- Louisiana Animal Disease Diagnostic Laboratory, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Viviana Parreño
- Instituto de Virología, CICVyA, Instituto Nacional de Tecnología Agropecuaria (INTA), Buenos Aires B1686LQF, Argentina;
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires C1033AAJ, Argentina
| |
Collapse
|
6
|
De Sautu M, Herrmann T, Jenni S, Harrison SC. The rotavirus VP5*/VP8* conformational transition permeabilizes membranes to Ca 2. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.10.15.562449. [PMID: 37905109 PMCID: PMC10614792 DOI: 10.1101/2023.10.15.562449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
Rotaviruses infect cells by delivering into the cytosol a transcriptionally active inner capsid particle (a "double-layer particle": DLP). Delivery is the function of a third, outer layer, which drives uptake from the cell surface into small vesicles from which the DLPs escape. In published work, we followed stages of rhesus rotavirus (RRV) entry by live-cell imaging and correlated them with structures from cryogenic electron microscopy and tomography (cryo-EM and cryo-ET). The virus appears to wrap itself in membrane, leading to complete engulfment and loss of Ca2+ from the vesicle produced by the wrapping. One of the outer-layer proteins, VP7, is a Ca2+-stabilized trimer; loss of Ca2+ releases both outer-layer proteins from the particle. The other outer-layer protein, VP4, activated by cleavage into VP8* and VP5*, is a trimer that undergoes a large-scale conformational rearrangement, reminiscent of the transition that viral fusion proteins undergo to penetrate a membrane. The rearrangement of VP5* thrusts a 250-residue, C-terminal segment of each of the three subunits outward, while allowing the protein to remain attached to the virus particle and to the cell being infected. We proposed that this segment inserts into the membrane of the target cell, enabling Ca2+ to cross. In the work reported here, we show the validity of key aspects of this proposed sequence. By cryo-EM studies of liposome-attached virions ("triple-layer particles": TLPs) and single-particle fluorescence imaging of liposome-attached TLPs, we confirm insertion of the VP4 C-terminal segment into the membrane and ensuing generation of a Ca2+ "leak". The results allow us to formulate a molecular description of early events in entry. We also discuss our observations in the context of other work on double-strand RNA virus entry.
Collapse
Affiliation(s)
- Marilina De Sautu
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 250 Longwood Avenue, Boston, MA 02115, USA
- Laboratory of Molecular Medicine, Boston Children’s Hospital, Boston, MA 02115, USA
| | - Tobias Herrmann
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 250 Longwood Avenue, Boston, MA 02115, USA
| | - Simon Jenni
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 250 Longwood Avenue, Boston, MA 02115, USA
| | - Stephen C. Harrison
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 250 Longwood Avenue, Boston, MA 02115, USA
- Laboratory of Molecular Medicine, Boston Children’s Hospital, Boston, MA 02115, USA
- Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115, USA
| |
Collapse
|
7
|
Ronsard L, Yousif AS, Nait Mohamed FA, Feldman J, Okonkwo V, McCarthy C, Schnabel J, Caradonna T, Barnes RM, Rohrer D, Lonberg N, Schmidt A, Lingwood D. Engaging an HIV vaccine target through the acquisition of low B cell affinity. Nat Commun 2023; 14:5249. [PMID: 37640732 PMCID: PMC10462694 DOI: 10.1038/s41467-023-40918-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 08/16/2023] [Indexed: 08/31/2023] Open
Abstract
Low affinity is common for germline B cell receptors (BCR) seeding development of broadly neutralizing antibodies (bnAbs) that engage hypervariable viruses, including HIV. Antibody affinity selection is also non-homogenizing, insuring the survival of low affinity B cell clones. To explore whether this provides a natural window for expanding human B cell lineages against conserved vaccine targets, we deploy transgenic mice mimicking human antibody diversity and somatic hypermutation (SHM) and immunize with simple monomeric HIV glycoprotein envelope immunogens. We report an immunization regimen that focuses B cell memory upon the conserved CD4 binding site (CD4bs) through both conventional affinity maturation and reproducible expansion of low affinity BCR clones with public patterns in SHM. In the latter instance, SHM facilitates target acquisition by decreasing binding strength. This suggests that permissive B cell selection enables the discovery of antibody epitopes, in this case an HIV bnAb site.
Collapse
Affiliation(s)
- Larance Ronsard
- The Ragon Institute of Mass General, The Massachusetts Institute of Technology and Harvard University, 400 Technology Square, Cambridge, MA, 02139, USA
| | - Ashraf S Yousif
- The Ragon Institute of Mass General, The Massachusetts Institute of Technology and Harvard University, 400 Technology Square, Cambridge, MA, 02139, USA
| | - Faez Amokrane Nait Mohamed
- The Ragon Institute of Mass General, The Massachusetts Institute of Technology and Harvard University, 400 Technology Square, Cambridge, MA, 02139, USA
| | - Jared Feldman
- The Ragon Institute of Mass General, The Massachusetts Institute of Technology and Harvard University, 400 Technology Square, Cambridge, MA, 02139, USA
| | - Vintus Okonkwo
- The Ragon Institute of Mass General, The Massachusetts Institute of Technology and Harvard University, 400 Technology Square, Cambridge, MA, 02139, USA
| | - Caitlin McCarthy
- The Ragon Institute of Mass General, The Massachusetts Institute of Technology and Harvard University, 400 Technology Square, Cambridge, MA, 02139, USA
| | - Julia Schnabel
- The Ragon Institute of Mass General, The Massachusetts Institute of Technology and Harvard University, 400 Technology Square, Cambridge, MA, 02139, USA
| | - Timothy Caradonna
- The Ragon Institute of Mass General, The Massachusetts Institute of Technology and Harvard University, 400 Technology Square, Cambridge, MA, 02139, USA
| | - Ralston M Barnes
- Bristol-Myers Squibb, 700 Bay Rd, Redwood City, CA, 94063-2478, USA
| | - Daniel Rohrer
- Bristol-Myers Squibb, 700 Bay Rd, Redwood City, CA, 94063-2478, USA
| | - Nils Lonberg
- Bristol-Myers Squibb, 700 Bay Rd, Redwood City, CA, 94063-2478, USA
| | - Aaron Schmidt
- The Ragon Institute of Mass General, The Massachusetts Institute of Technology and Harvard University, 400 Technology Square, Cambridge, MA, 02139, USA
- Department of Microbiology, Harvard Medical School, Boston, MA, 02115, USA
| | - Daniel Lingwood
- The Ragon Institute of Mass General, The Massachusetts Institute of Technology and Harvard University, 400 Technology Square, Cambridge, MA, 02139, USA.
| |
Collapse
|
8
|
Desselberger U. 14th International dsRNA Virus Symposium, Banff, Alberta, Canada, 10-14 October 2022. Virus Res 2023; 324:199032. [PMID: 36584760 DOI: 10.1016/j.virusres.2022.199032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/23/2022] [Accepted: 12/24/2022] [Indexed: 12/29/2022]
Abstract
This triennial International dsRNA Virus Symposium covered original data which have accrued during the most recent five years. In detail, the genomic diversity of these viruses continued to be explored; various structure-function studies were carried out using reverse genetics and biophysical techniques; intestinal organoids proved to be very suitable for special pathogenesis studies; and the potential of next generation rotavirus vaccines including use of rotavirus recombinants as vectored vaccine candidates was explored. 'Non-lytic release of enteric viruses in cloaked vesicles' was the topic of the keynote lecture by Nihal Altan-Bonnet, NIH, Bethesda, USA. The Jean Cohen lecturer of this meeting was Polly Roy, London School of Hygiene and Tropical Medicine, who spoke on aspects of the replication cycle of bluetongue viruses, and how some of the data are similar to details of rotavirus replication.
Collapse
Affiliation(s)
- Ulrich Desselberger
- Department of Medicine, University of Cambridge, Addenbrooke's Hospital, Cambridge CB2 0QQ, U.K..
| |
Collapse
|