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Yousaf I, Hannon WW, Donohue RC, Pfaller CK, Yadav K, Dikdan RJ, Tyagi S, Schroeder DC, Shieh WJ, Rota PA, Feder AF, Cattaneo R. Brain tropism acquisition: The spatial dynamics and evolution of a measles virus collective infectious unit that drove lethal subacute sclerosing panencephalitis. PLoS Pathog 2023; 19:e1011817. [PMID: 38127684 PMCID: PMC10735034 DOI: 10.1371/journal.ppat.1011817] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 11/10/2023] [Indexed: 12/23/2023] Open
Abstract
It is increasingly appreciated that pathogens can spread as infectious units constituted by multiple, genetically diverse genomes, also called collective infectious units or genome collectives. However, genetic characterization of the spatial dynamics of collective infectious units in animal hosts is demanding, and it is rarely feasible in humans. Measles virus (MeV), whose spread in lymphatic tissues and airway epithelia relies on collective infectious units, can, in rare cases, cause subacute sclerosing panencephalitis (SSPE), a lethal human brain disease. In different SSPE cases, MeV acquisition of brain tropism has been attributed to mutations affecting either the fusion or the matrix protein, or both, but the overarching mechanism driving brain adaptation is not understood. Here we analyzed MeV RNA from several spatially distinct brain regions of an individual who succumbed to SSPE. Surprisingly, we identified two major MeV genome subpopulations present at variable frequencies in all 15 brain specimens examined. Both genome types accumulated mutations like those shown to favor receptor-independent cell-cell spread in other SSPE cases. Most infected cells carried both genome types, suggesting the possibility of genetic complementation. We cannot definitively chart the history of the spread of this virus in the brain, but several observations suggest that mutant genomes generated in the frontal cortex moved outwards as a collective and diversified. During diversification, mutations affecting the cytoplasmic tails of both viral envelope proteins emerged and fluctuated in frequency across genetic backgrounds, suggesting convergent and potentially frequency-dependent evolution for modulation of fusogenicity. We propose that a collective infectious unit drove MeV pathogenesis in this brain. Re-examination of published data suggests that similar processes may have occurred in other SSPE cases. Our studies provide a primer for analyses of the evolution of collective infectious units of other pathogens that cause lethal disease in humans.
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Affiliation(s)
- Iris Yousaf
- Department of Molecular Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
- Mayo Clinic Graduate School of Biomedical Sciences, Rochester, Minnesota, United States of America
| | - William W. Hannon
- Basic Sciences and Computational Biology, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
- Molecular and Cellular Biology Graduate Program, University of Washington, Seattle, Washington, United States of America
| | - Ryan C. Donohue
- Mayo Clinic Graduate School of Biomedical Sciences, Rochester, Minnesota, United States of America
| | - Christian K. Pfaller
- Department of Molecular Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
- Mayo Clinic Graduate School of Biomedical Sciences, Rochester, Minnesota, United States of America
| | - Kalpana Yadav
- Department of Molecular Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Ryan J. Dikdan
- Public Health Research Institute, Rutgers University, Newark, New Jersey, United States of America
| | - Sanjay Tyagi
- Public Health Research Institute, Rutgers University, Newark, New Jersey, United States of America
| | - Declan C. Schroeder
- Department of Veterinary Population Medicine, University of Minnesota, St Paul, Minnesota, United States of America
| | - Wun-Ju Shieh
- Infectious Diseases Pathology Branch, Division of High Consequence Pathogens and Pathology, Center for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Paul A. Rota
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Center for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Alison F. Feder
- Genome Sciences, University of Washington, Seattle, Washington, United States of America
- Public Health Sciences and Computational Biology, Fred Hutchinson Cancer Center, Seattle, Washington, United States of America
| | - Roberto Cattaneo
- Department of Molecular Medicine, Mayo Clinic, Rochester, Minnesota, United States of America
- Mayo Clinic Graduate School of Biomedical Sciences, Rochester, Minnesota, United States of America
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Sakamoto K, Konami M, Kameda S, Satoh Y, Wakimoto H, Kitagawa Y, Gotoh B, Jiang DP, Hotta H, Itoh M. Suppression of viral RNA polymerase activity is necessary for persistent infection during the transformation of measles virus into SSPE virus. PLoS Pathog 2023; 19:e1011528. [PMID: 37494386 PMCID: PMC10406308 DOI: 10.1371/journal.ppat.1011528] [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: 12/19/2022] [Revised: 08/07/2023] [Accepted: 07/03/2023] [Indexed: 07/28/2023] Open
Abstract
Subacute sclerosing panencephalitis (SSPE) is a fatal neurodegenerative disease caused by measles virus (MV), which typically develops 7 to 10 years after acute measles. During the incubation period, MV establishes a persistent infection in the brain and accumulates mutations that generate neuropathogenic SSPE virus. The neuropathogenicity is closely associated with enhanced propagation mediated by cell-to-cell fusion in the brain, which is principally regulated by hyperfusogenic mutations of the viral F protein. The molecular mechanisms underlying establishment and maintenance of persistent infection are unclear because it is impractical to isolate viruses before the appearance of clinical signs. In this study, we found that the L and P proteins, components of viral RNA-dependent RNA polymerase (RdRp), of an SSPE virus Kobe-1 strain did not promote but rather attenuated viral neuropathogenicity. Viral RdRp activity corresponded to F protein expression; the suppression of RdRp activity in the Kobe-1 strain because of mutations in the L and P proteins led to restriction of the F protein level, thereby reducing cell-to-cell fusion mediated propagation in neuronal cells and decreasing neuropathogenicity. Therefore, the L and P proteins of Kobe-1 did not contribute to progression of SSPE. Three mutations in the L protein strongly suppressed RdRp activity. Recombinant MV harboring the three mutations limited viral spread in neuronal cells while preventing the release of infectious progeny particles; these changes could support persistent infection by enabling host immune escape and preventing host cell lysis. Therefore, the suppression of RdRp activity is necessary for the persistent infection of the parental MV on the way to transform into Kobe-1 SSPE virus. Because mutations in the genome of an SSPE virus reflect the process of SSPE development, mutation analysis will provide insight into the mechanisms underlying persistent infection.
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Affiliation(s)
- Kento Sakamoto
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
| | - Miho Konami
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
| | - Shinra Kameda
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
| | - Yuto Satoh
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
| | - Hiroshi Wakimoto
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
| | - Yoshinori Kitagawa
- Division of Microbiology and Infectious Diseases, Department of Pathology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Bin Gotoh
- Division of Microbiology and Infectious Diseases, Department of Pathology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Da-Peng Jiang
- Graduate School of Medicine, Kobe University, Kobe, Hyogo, Japan
| | - Hak Hotta
- Graduate School of Medicine, Kobe University, Kobe, Hyogo, Japan
| | - Masae Itoh
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
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Shirogane Y, Harada H, Hirai Y, Takemoto R, Suzuki T, Hashiguchi T, Yanagi Y. Collective fusion activity determines neurotropism of an en bloc transmitted enveloped virus. SCIENCE ADVANCES 2023; 9:eadf3731. [PMID: 36706187 PMCID: PMC9882980 DOI: 10.1126/sciadv.adf3731] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 12/29/2022] [Indexed: 06/09/2023]
Abstract
Measles virus (MeV), which is usually non-neurotropic, sometimes persists in the brain and causes subacute sclerosing panencephalitis (SSPE) several years after acute infection, serving as a model for persistent viral infections. The persisting MeVs have hyperfusogenic mutant fusion (F) proteins that likely enable cell-cell fusion at synapses and "en bloc transmission" between neurons. We here show that during persistence, F protein fusogenicity is generally enhanced by cumulative mutations, yet mutations paradoxically reducing the fusogenicity may be selected alongside the wild-type (non-neurotropic) MeV genome. A mutant F protein having SSPE-derived substitutions exhibits lower fusogenicity than the hyperfusogenic F protein containing some of those substitutions, but by the wild-type F protein coexpression, the fusogenicity of the former F protein is enhanced, while that of the latter is nearly abolished. These findings advance the understanding of the long-term process of MeV neuropathogenicity and provide critical insight into the genotype-phenotype relationships of en bloc transmitted viruses.
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Affiliation(s)
- Yuta Shirogane
- Department of Virology, Faculty of Medicine, Kyushu University, Fukuoka, Japan
| | - Hidetaka Harada
- Department of Virology, Faculty of Medicine, Kyushu University, Fukuoka, Japan
| | - Yuichi Hirai
- Department of Virology, Faculty of Medicine, Kyushu University, Fukuoka, Japan
| | - Ryuichi Takemoto
- Department of Virology, Faculty of Medicine, Kyushu University, Fukuoka, Japan
| | - Tateki Suzuki
- Laboratory of Medical Virology, Institute for Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Takao Hashiguchi
- Laboratory of Medical Virology, Institute for Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Yusuke Yanagi
- National Research Center for the Control and Prevention of Infectious Diseases, Nagasaki University, Nagasaki, Japan
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Sakamoto K, Satoh Y, Takahashi KI, Wakimoto H, Kitagawa Y, Gotoh B, Ayata M, Itoh M. Upregulation of viral RNA polymerase activity promotes adaptation of SSPE virus to neuronal cells. Virology 2022; 573:1-11. [DOI: 10.1016/j.virol.2022.05.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 05/13/2022] [Accepted: 05/24/2022] [Indexed: 11/26/2022]
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Satoh Y, Higuchi K, Nishikawa D, Wakimoto H, Konami M, Sakamoto K, Kitagawa Y, Gotoh B, Jiang DP, Hotta H, Itoh M. M protein of subacute sclerosing panencephalitis virus, synergistically with the F protein, plays a crucial role in viral neuropathogenicity. J Gen Virol 2021; 102. [PMID: 34643483 PMCID: PMC8604190 DOI: 10.1099/jgv.0.001682] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Subacute sclerosing panencephalitis (SSPE) is a rare fatal neurodegenerative disease caused by a measles virus (MV) variant, SSPE virus, that accumulates mutations during long-term persistent infection of the central nervous system (CNS). Clusters of mutations identified around the matrix (M) protein in many SSPE viruses suppress productive infectious particle release and accelerate cell–cell fusion, which are features of SSPE viruses. It was reported, however, that these defects of M protein function might not be correlated directly with promotion of neurovirulence, although they might enable establishment of persistent infection. Neuropathogenicity is closely related to the character of the viral fusion (F) protein, and amino acid substitution(s) in the F protein of some SSPE viruses confers F protein hyperfusogenicity, facilitating viral propagation in the CNS through cell–cell fusion and leading to neurovirulence. The F protein of an SSPE virus Kobe-1 strain, however, displayed only moderately enhanced fusion activity and required additional mutations in the M protein for neuropathogenicity in mice. We demonstrated here the mechanism for the M protein of the Kobe-1 strain supporting the fusion activity of the F protein and cooperatively inducing neurovirulence, even though each protein, independently, has no effect on virulence. The occurrence of SSPE has been estimated recently as one in several thousand in children who acquired measles under the age of 5 years, markedly higher than reported previously. The probability of a specific mutation (or mutations) occurring in the F protein conferring hyperfusogenicity and neuropathogenicity might not be sufficient to explain the high frequency of SSPE. The induction of neurovirulence by M protein synergistically with moderately fusogenic F protein could account for the high frequency of SSPE.
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Affiliation(s)
- Yuto Satoh
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
| | - Kurara Higuchi
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
| | - Daichi Nishikawa
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
| | - Hiroshi Wakimoto
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
| | - Miho Konami
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
| | - Kento Sakamoto
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
| | - Yoshinori Kitagawa
- Division of Microbiology and Infectious Diseases, Department of Pathology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Bin Gotoh
- Division of Microbiology and Infectious Diseases, Department of Pathology, Shiga University of Medical Science, Otsu, Shiga, Japan
| | - Da-Peng Jiang
- Graduate School of Medicine, Kobe University, Kobe, Hyogo, Japan
| | - Hak Hotta
- Graduate School of Medicine, Kobe University, Kobe, Hyogo, Japan
- Present address: Faculty of Clinical Nutrition and Dietetics, Konan Women’s University, Kobe, Hyogo, Japan
| | - Masae Itoh
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan
- *Correspondence: Masae Itoh,
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Greninger AL, Rybkina K, Lin MJ, Drew-Bear J, Marcink TC, Shean RC, Makhsous N, Boeckh M, Harder O, Bovier F, Burstein SR, Niewiesk S, Rima BK, Porotto M, Moscona A. Human parainfluenza virus evolution during lung infection of immunocompromised humans promotes viral persistence. J Clin Invest 2021; 131:150506. [PMID: 34609969 DOI: 10.1172/jci150506] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 10/01/2021] [Indexed: 11/17/2022] Open
Abstract
The capacity of respiratory viruses to undergo evolution within the respiratory tract raises the possibility of evolution under the selective pressure of the host environment or drug treatment. Long-term infections in immunocompromised hosts are potential drivers of viral evolution and development of infectious variants. We show that intra-host evolution in chronic human parainfluenza virus 3 (HPIV3) infection in immunocompromised individuals elicited mutations that favor viral entry and persistence, suggesting that similar processes may operate across enveloped respiratory viruses. We profiled longitudinal HPIV3 infections from two immunocompromised individuals that persisted for 278 and 98 days. Mutations accrued in the HPIV3 attachment protein hemagglutinin-neuraminidase (HN), including the first in vivo mutation in HN's receptor binding site responsible for activating the viral fusion process. Fixation of this mutation was associated with exposure to a drug that cleaves host cell sialic acid moieties. Longitudinal adaptation of HN was associated with features that promote viral entry and persistence in cells, including greater avidity for sialic acid and more active fusion activity in vitro, but not with antibody escape. Long term infection thus led to mutations promoting viral persistence, suggesting that host-directed therapeutics may support the evolution of viruses that alter their biophysical characteristics to persist in the face of these agents in vivo.
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Affiliation(s)
- Alexander L Greninger
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, United States of America
| | - Ksenia Rybkina
- Department of Pediatrics, Columbia University Vagelos College of Physicians and Surgeons, New York, United States of America
| | - Michelle J Lin
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, United States of America
| | - Jennifer Drew-Bear
- Department of Pediatrics, Columbia University Vagelos College of Physicians and Surgeons, New York, United States of America
| | - Tara C Marcink
- Department of Pediatrics, Columbia University Vagelos College of Physicians and Surgeons, New York, United States of America
| | - Ryan C Shean
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, United States of America
| | - Negar Makhsous
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, United States of America
| | - Michael Boeckh
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, United States of America
| | - Olivia Harder
- Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, United States of America
| | - Francesca Bovier
- Department of Pediatrics, Columbia University Vagelos College of Physicians and Surgeons, New York, United States of America
| | - Shana R Burstein
- Department of Pediatrics, Columbia University Vagelos College of Physicians and Surgeons, New York, United States of America
| | - Stefan Niewiesk
- Department of Veterinary Biosciences, College of Veterinary Medicine, The Ohio State University, Columbus, United States of America
| | - Bert K Rima
- School of Medicine Dentistry and Biomedical Sceinces, Queen's University of Belfast, Belfast, United Kingdom
| | - Matteo Porotto
- Department of Pediatrics, Columbia University Vagelos College of Physicians and Surgeons, New York, United States of America
| | - Anne Moscona
- Department of Microbiology and Immunology, Columbia University Vagelos College of Physicians and Surgeons, New York, United States of America
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Watanabe S, Shirogane Y, Sato Y, Hashiguchi T, Yanagi Y. New Insights into Measles Virus Brain Infections. Trends Microbiol 2019; 27:164-175. [DOI: 10.1016/j.tim.2018.08.010] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Revised: 08/22/2018] [Accepted: 08/24/2018] [Indexed: 11/15/2022]
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Satoh Y, Yonemori S, Hirose M, Shogaki H, Wakimoto H, Kitagawa Y, Gotoh B, Shirai T, Takahashi KI, Itoh M. A residue located at the junction of the head and stalk regions of measles virus fusion protein regulates membrane fusion by controlling conformational stability. J Gen Virol 2017; 98:143-154. [PMID: 27911256 DOI: 10.1099/jgv.0.000670] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The fusion (F) protein of measles virus performs refolding from the thermodynamically metastable prefusion form to the highly stable postfusion form via an activated unstable intermediate stage, to induce membrane fusion. Some amino acids involved in the fusion regulation cluster in the heptad repeat B (HR-B) domain of the stalk region, among which substitution of residue 465 by various amino acids revealed that fusion activity correlates well with its side chain length from the Cα (P<0.01) and van der Waals volume (P<0.001), except for Phe, Tyr, Trp, Pro and His carrying ring structures. Directed towards the head region, longer side chains of the non-ring-type 465 residues penetrate more deeply into the head region and may disturb the hydrophobic interaction between the stalk and head regions and cause destabilization of the molecule by lowering the energy barrier for refolding, which conferred the F protein enhanced fusion activity. Contrarily, the side chain of ring-type 465 residues turned away from the head region, resulting in not only no contact with the head region but also extensive coverage of the HR-B surface, which may prevent the dissociation of the HR-B bundle for initiation of membrane fusion and suppress fusion activity. Located in the HR-B domain just at the junction between the head and stalk regions, amino acid 465 is endowed with a possible ability to either destabilize or stabilize the F protein depending on its molecular volume and the direction of the side chain, regulating fusion activity of measles virus F protein.
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Affiliation(s)
- Yuto Satoh
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, 1266 Tamura-cho, Nagahama, Shiga 526-0829, Japan
| | - Saeka Yonemori
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, 1266 Tamura-cho, Nagahama, Shiga 526-0829, Japan
| | - Mitsuhiro Hirose
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, 1266 Tamura-cho, Nagahama, Shiga 526-0829, Japan
| | - Hiroko Shogaki
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, 1266 Tamura-cho, Nagahama, Shiga 526-0829, Japan
| | - Hiroshi Wakimoto
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, 1266 Tamura-cho, Nagahama, Shiga 526-0829, Japan
| | - Yoshinori Kitagawa
- Division of Microbiology and Infectious Diseases, Department of Pathology, Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan
| | - Bin Gotoh
- Division of Microbiology and Infectious Diseases, Department of Pathology, Shiga University of Medical Science, Seta Tsukinowa-cho, Otsu, Shiga 520-2192, Japan
| | - Tsuyoshi Shirai
- Department of Computer Bioscience, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, 1266 Tamura-cho, Nagahama, Shiga 526-0829, Japan
| | - Ken-Ichi Takahashi
- Department of Computer Bioscience, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, 1266 Tamura-cho, Nagahama, Shiga 526-0829, Japan
| | - Masae Itoh
- Department of Microbiology, Faculty of Bio-Science, Nagahama Institute of Bio-Science and Technology, 1266 Tamura-cho, Nagahama, Shiga 526-0829, Japan
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Deep sequencing reveals persistence of cell-associated mumps vaccine virus in chronic encephalitis. Acta Neuropathol 2017; 133:139-147. [PMID: 27770235 PMCID: PMC5209397 DOI: 10.1007/s00401-016-1629-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 10/04/2016] [Accepted: 10/04/2016] [Indexed: 10/31/2022]
Abstract
Routine childhood vaccination against measles, mumps and rubella has virtually abolished virus-related morbidity and mortality. Notwithstanding this, we describe here devastating neurological complications associated with the detection of live-attenuated mumps virus Jeryl Lynn (MuVJL5) in the brain of a child who had undergone successful allogeneic transplantation for severe combined immunodeficiency (SCID). This is the first confirmed report of MuVJL5 associated with chronic encephalitis and highlights the need to exclude immunodeficient individuals from immunisation with live-attenuated vaccines. The diagnosis was only possible by deep sequencing of the brain biopsy. Sequence comparison of the vaccine batch to the MuVJL5 isolated from brain identified biased hypermutation, particularly in the matrix gene, similar to those found in measles from cases of SSPE. The findings provide unique insights into the pathogenesis of paramyxovirus brain infections.
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Measles Virus Hemagglutinin Protein Epitopes: The Basis of Antigenic Stability. Viruses 2016; 8:v8080216. [PMID: 27490564 PMCID: PMC4997578 DOI: 10.3390/v8080216] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 07/19/2016] [Accepted: 07/20/2016] [Indexed: 02/07/2023] Open
Abstract
Globally eliminating measles using available vaccines is biologically feasible because the measles virus (MV) hemagglutinin (H) protein is antigenically stable. The H protein is responsible for receptor binding, and is the main target of neutralizing antibodies. The immunodominant epitope, known as the hemagglutinating and noose epitope, is located near the receptor-binding site (RBS). The RBS also contains an immunodominant epitope. Loss of receptor binding correlates with an escape from the neutralization by antibodies that target the epitope at RBS. Another neutralizing epitope is located near RBS and is shielded by an N-linked sugar in certain genotype strains. However, human sera from vaccinees and measles patients neutralized all MV strains with similar efficiencies, regardless of the N-linked sugar modification or mutations at these epitopes. Two other major epitopes exist at a distance from RBS. One has an unstructured flexible domain with a linear neutralizing epitope. When MV-H forms a tetramer (dimer of dimers), these epitopes may form the dimer-dimer interface, and one of the two epitopes may also interact with the F protein. The neutralization mechanisms of antibodies that recognize these epitopes may involve inhibiting the H-F interaction or blocking the fusion cascade after MV-H binds to its receptors.
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