The HA and NS Genes of Human H5N1 Influenza A Virus Contribute to High Virulence in Ferrets

Highly pathogenic H5N1 influenza A viruses have spread across Asia, Europe, and Africa. More than 500 cases of H5N1 virus infection in humans, with a high lethality rate, have been reported. To understand the molecular basis for the high virulence of H5N1 viruses in mammals, we tested the virulence...

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Published inPLoS pathogens Vol. 6; no. 9; p. e1001106
Main Authors Imai, Hirotaka, Shinya, Kyoko, Takano, Ryo, Kiso, Maki, Muramoto, Yukiko, Sakabe, Saori, Murakami, Shin, Ito, Mutsumi, Yamada, Shinya, Le, Mai thi Quynh, Nidom, Chairul A., Sakai-Tagawa, Yuko, Takahashi, Kei, Omori, Yasuyuki, Noda, Takeshi, Shimojima, Masayuki, Kakugawa, Satoshi, Goto, Hideo, Iwatsuki-Horimoto, Kiyoko, Horimoto, Taisuke, Kawaoka, Yoshihiro
Format Journal Article
LanguageEnglish
Published United States Public Library of Science 01.09.2010
Public Library of Science (PLoS)
Subjects
Online AccessGet full text
ISSN1553-7374
1553-7366
1553-7374
DOI10.1371/journal.ppat.1001106

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Abstract Highly pathogenic H5N1 influenza A viruses have spread across Asia, Europe, and Africa. More than 500 cases of H5N1 virus infection in humans, with a high lethality rate, have been reported. To understand the molecular basis for the high virulence of H5N1 viruses in mammals, we tested the virulence in ferrets of several H5N1 viruses isolated from humans and found A/Vietnam/UT3062/04 (UT3062) to be the most virulent and A/Vietnam/UT3028/03 (UT3028) to be avirulent in this animal model. We then generated a series of reassortant viruses between the two viruses and assessed their virulence in ferrets. All of the viruses that possessed both the UT3062 hemagglutinin (HA) and nonstructural protein (NS) genes were highly virulent. By contrast, all those possessing the UT3028 HA or NS genes were attenuated in ferrets. These results demonstrate that the HA and NS genes are responsible for the difference in virulence in ferrets between the two viruses. Amino acid differences were identified at position 134 of HA, at positions 200 and 205 of NS1, and at positions 47 and 51 of NS2. We found that the residue at position 134 of HA alters the receptor-binding property of the virus, as measured by viral elution from erythrocytes. Further, both of the residues at positions 200 and 205 of NS1 contributed to enhanced type I interferon (IFN) antagonistic activity. These findings further our understanding of the determinants of pathogenicity of H5N1 viruses in mammals.
AbstractList Highly pathogenic H5N1 influenza A viruses have spread across Asia, Europe, and Africa. More than 500 cases of H5N1 virus infection in humans, with a high lethality rate, have been reported. To understand the molecular basis for the high virulence of H5N1 viruses in mammals, we tested the virulence in ferrets of several H5N1 viruses isolated from humans and found A/Vietnam/UT3062/04 (UT3062) to be the most virulent and A/Vietnam/UT3028/03 (UT3028) to be avirulent in this animal model. We then generated a series of reassortant viruses between the two viruses and assessed their virulence in ferrets. All of the viruses that possessed both the UT3062 hemagglutinin (HA) and nonstructural protein (NS) genes were highly virulent. By contrast, all those possessing the UT3028 HA or NS genes were attenuated in ferrets. These results demonstrate that the HA and NS genes are responsible for the difference in virulence in ferrets between the two viruses. Amino acid differences were identified at position 134 of HA, at positions 200 and 205 of NS1, and at positions 47 and 51 of NS2. We found that the residue at position 134 of HA alters the receptor-binding property of the virus, as measured by viral elution from erythrocytes. Further, both of the residues at positions 200 and 205 of NS1 contributed to enhanced type I interferon (IFN) antagonistic activity. These findings further our understanding of the determinants of pathogenicity of H5N1 viruses in mammals.Highly pathogenic H5N1 influenza A viruses have spread across Asia, Europe, and Africa. More than 500 cases of H5N1 virus infection in humans, with a high lethality rate, have been reported. To understand the molecular basis for the high virulence of H5N1 viruses in mammals, we tested the virulence in ferrets of several H5N1 viruses isolated from humans and found A/Vietnam/UT3062/04 (UT3062) to be the most virulent and A/Vietnam/UT3028/03 (UT3028) to be avirulent in this animal model. We then generated a series of reassortant viruses between the two viruses and assessed their virulence in ferrets. All of the viruses that possessed both the UT3062 hemagglutinin (HA) and nonstructural protein (NS) genes were highly virulent. By contrast, all those possessing the UT3028 HA or NS genes were attenuated in ferrets. These results demonstrate that the HA and NS genes are responsible for the difference in virulence in ferrets between the two viruses. Amino acid differences were identified at position 134 of HA, at positions 200 and 205 of NS1, and at positions 47 and 51 of NS2. We found that the residue at position 134 of HA alters the receptor-binding property of the virus, as measured by viral elution from erythrocytes. Further, both of the residues at positions 200 and 205 of NS1 contributed to enhanced type I interferon (IFN) antagonistic activity. These findings further our understanding of the determinants of pathogenicity of H5N1 viruses in mammals.
Highly pathogenic H5N1 influenza A viruses have spread across Asia, Europe, and Africa. More than 500 cases of H5N1 virus infection in humans, with a high lethality rate, have been reported. To understand the molecular basis for the high virulence of H5N1 viruses in mammals, we tested the virulence in ferrets of several H5N1 viruses isolated from humans and found A/Vietnam/UT3062/04 (UT3062) to be the most virulent and A/Vietnam/UT3028/03 (UT3028) to be avirulent in this animal model. We then generated a series of reassortant viruses between the two viruses and assessed their virulence in ferrets. All of the viruses that possessed both the UT3062 hemagglutinin (HA) and nonstructural protein (NS) genes were highly virulent. By contrast, all those possessing the UT3028 HA or NS genes were attenuated in ferrets. These results demonstrate that the HA and NS genes are responsible for the difference in virulence in ferrets between the two viruses. Amino acid differences were identified at position 134 of HA, at positions 200 and 205 of NS1, and at positions 47 and 51 of NS2. We found that the residue at position 134 of HA alters the receptor-binding property of the virus, as measured by viral elution from erythrocytes. Further, both of the residues at positions 200 and 205 of NS1 contributed to enhanced type I interferon (IFN) antagonistic activity. These findings further our understanding of the determinants of pathogenicity of H5N1 viruses in mammals. Highly pathogenic H5N1 influenza A viruses have caused more than 500 human infections with approximately 60% lethality in 15 countries and continue to pose a pandemic threat. The recent worldwide spread of pandemic H1N1 influenza A viruses raises the concern of reassortment between the H5N1 viruses and other influenza viruses. However, the molecular determinants for high virulence of the H5N1 viruses in mammals are not fully understood. We, therefore, investigated their virulence in a ferret model, which is a widely accepted animal model for assessing human influenza virus replication. We identified an amino acid in hemagglutinin and four amino acids in nonstructural proteins that are associated with high virulence of a human H5N1 virus, A/Vietnam/UT3062/04. We also found that the amino acid in hemagglutinin changes its receptor-binding property and the amino acids in nonstructural protein 1 affect its interferon antagonistic ability. These findings provide insight into the pathogenesis of H5N1 viruses in mammals.
Highly pathogenic H5N1 influenza A viruses have spread across Asia, Europe, and Africa. More than 500 cases of H5N1 virus infection in humans, with a high lethality rate, have been reported. To understand the molecular basis for the high virulence of H5N1 viruses in mammals, we tested the virulence in ferrets of several H5N1 viruses isolated from humans and found A/Vietnam/UT3062/04 (UT3062) to be the most virulent and A/Vietnam/UT3028/03 (UT3028) to be avirulent in this animal model. We then generated a series of reassortant viruses between the two viruses and assessed their virulence in ferrets. All of the viruses that possessed both the UT3062 hemagglutinin (HA) and nonstructural protein (NS) genes were highly virulent. By contrast, all those possessing the UT3028 HA or NS genes were attenuated in ferrets. These results demonstrate that the HA and NS genes are responsible for the difference in virulence in ferrets between the two viruses. Amino acid differences were identified at position 134 of HA, at positions 200 and 205 of NS1, and at positions 47 and 51 of NS2. We found that the residue at position 134 of HA alters the receptor-binding property of the virus, as measured by viral elution from erythrocytes. Further, both of the residues at positions 200 and 205 of NS1 contributed to enhanced type I interferon (IFN) antagonistic activity. These findings further our understanding of the determinants of pathogenicity of H5N1 viruses in mammals. Highly pathogenic H5N1 influenza A viruses have caused more than 500 human infections with approximately 60% lethality in 15 countries and continue to pose a pandemic threat. The recent worldwide spread of pandemic H1N1 influenza A viruses raises the concern of reassortment between the H5N1 viruses and other influenza viruses. However, the molecular determinants for high virulence of the H5N1 viruses in mammals are not fully understood. We, therefore, investigated their virulence in a ferret model, which is a widely accepted animal model for assessing human influenza virus replication. We identified an amino acid in hemagglutinin and four amino acids in nonstructural proteins that are associated with high virulence of a human H5N1 virus, A/Vietnam/UT3062/04. We also found that the amino acid in hemagglutinin changes its receptor-binding property and the amino acids in nonstructural protein 1 affect its interferon antagonistic ability. These findings provide insight into the pathogenesis of H5N1 viruses in mammals.
Highly pathogenic H5N1 influenza A viruses have spread across Asia, Europe, and Africa. More than 500 cases of H5N1 virus infection in humans, with a high lethality rate, have been reported. To understand the molecular basis for the high virulence of H5N1 viruses in mammals, we tested the virulence in ferrets of several H5N1 viruses isolated from humans and found A/Vietnam/UT3062/04 (UT3062) to be the most virulent and A/Vietnam/UT3028/03 (UT3028) to be avirulent in this animal model. We then generated a series of reassortant viruses between the two viruses and assessed their virulence in ferrets. All of the viruses that possessed both the UT3062 hemagglutinin (HA) and nonstructural protein (NS) genes were highly virulent. By contrast, all those possessing the UT3028 HA or NS genes were attenuated in ferrets. These results demonstrate that the HA and NS genes are responsible for the difference in virulence in ferrets between the two viruses. Amino acid differences were identified at position 134 of HA, at positions 200 and 205 of NS1, and at positions 47 and 51 of NS2. We found that the residue at position 134 of HA alters the receptor-binding property of the virus, as measured by viral elution from erythrocytes. Further, both of the residues at positions 200 and 205 of NS1 contributed to enhanced type I interferon (IFN) antagonistic activity. These findings further our understanding of the determinants of pathogenicity of H5N1 viruses in mammals.
  Highly pathogenic H5N1 influenza A viruses have spread across Asia, Europe, and Africa. More than 500 cases of H5N1 virus infection in humans, with a high lethality rate, have been reported. To understand the molecular basis for the high virulence of H5N1 viruses in mammals, we tested the virulence in ferrets of several H5N1 viruses isolated from humans and found A/Vietnam/UT3062/04 (UT3062) to be the most virulent and A/Vietnam/UT3028/03 (UT3028) to be avirulent in this animal model. We then generated a series of reassortant viruses between the two viruses and assessed their virulence in ferrets. All of the viruses that possessed both the UT3062 hemagglutinin (HA) and nonstructural protein (NS) genes were highly virulent. By contrast, all those possessing the UT3028 HA or NS genes were attenuated in ferrets. These results demonstrate that the HA and NS genes are responsible for the difference in virulence in ferrets between the two viruses. Amino acid differences were identified at position 134 of HA, at positions 200 and 205 of NS1, and at positions 47 and 51 of NS2. We found that the residue at position 134 of HA alters the receptor-binding property of the virus, as measured by viral elution from erythrocytes. Further, both of the residues at positions 200 and 205 of NS1 contributed to enhanced type I interferon (IFN) antagonistic activity. These findings further our understanding of the determinants of pathogenicity of H5N1 viruses in mammals.
Audience Academic
Author Nidom, Chairul A.
Shimojima, Masayuki
Kakugawa, Satoshi
Muramoto, Yukiko
Iwatsuki-Horimoto, Kiyoko
Goto, Hideo
Takahashi, Kei
Kiso, Maki
Takano, Ryo
Imai, Hirotaka
Noda, Takeshi
Kawaoka, Yoshihiro
Sakabe, Saori
Sakai-Tagawa, Yuko
Omori, Yasuyuki
Ito, Mutsumi
Shinya, Kyoko
Le, Mai thi Quynh
Yamada, Shinya
Horimoto, Taisuke
Murakami, Shin
AuthorAffiliation 3 The International Center for Medical Research and Treatment, Kobe University, Kobe, Japan
4 National Institute of Hygiene and Epidemiology, Hanoi, Vietnam
Mount Sinai School of Medicine, United States of America
1 Division of Virology, Department of Microbiology and Immunology, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
5 Avian Influenza Laboratory, Tropical Disease Centre, Airlangga University, Surabaya, Indonesia
6 Department of Special Pathogens, International Research Center for Infectious Diseases, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
7 School of Medicine and Public Health, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
2 ERATO Infection-induced Host Responses Project, Saitama, Japan
AuthorAffiliation_xml – name: 2 ERATO Infection-induced Host Responses Project, Saitama, Japan
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BackLink https://www.ncbi.nlm.nih.gov/pubmed/20862325$$D View this record in MEDLINE/PubMed
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ContentType Journal Article
Copyright COPYRIGHT 2010 Public Library of Science
Imai et al. 2010
2010 Imai et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Imai H, Shinya K, Takano R, Kiso M, Muramoto Y, et al. (2010) The HA and NS Genes of Human H5N1 Influenza A Virus Contribute to High Virulence in Ferrets. PLoS Pathog 6(9): e1001106. doi:10.1371/journal.ppat.1001106
Copyright_xml – notice: COPYRIGHT 2010 Public Library of Science
– notice: Imai et al. 2010
– notice: 2010 Imai et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Imai H, Shinya K, Takano R, Kiso M, Muramoto Y, et al. (2010) The HA and NS Genes of Human H5N1 Influenza A Virus Contribute to High Virulence in Ferrets. PLoS Pathog 6(9): e1001106. doi:10.1371/journal.ppat.1001106
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Conceived and designed the experiments: HI YM SM SY YK. Performed the experiments: HI KS RT MK YM SS MI KT YO TN MS SK HG KIH TH. Analyzed the data: HI KS YK. Contributed reagents/materials/analysis tools: HI SS MI MtQL CAN YST. Wrote the paper: HI KS YK.
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Snippet Highly pathogenic H5N1 influenza A viruses have spread across Asia, Europe, and Africa. More than 500 cases of H5N1 virus infection in humans, with a high...
  Highly pathogenic H5N1 influenza A viruses have spread across Asia, Europe, and Africa. More than 500 cases of H5N1 virus infection in humans, with a high...
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StartPage e1001106
SubjectTerms Amino acids
Animal models
Animals
Avian flu
Avian influenza viruses
Cells, Cultured
Diseases
Dogs
Erythrocytes
Experiments
Ferrets
Genes
Genetic aspects
Grants
Hemagglutinin Glycoproteins, Influenza Virus - genetics
Hemagglutinin Glycoproteins, Influenza Virus - metabolism
Hemagglutinins
Humans
Infection
Infections
Infectious Diseases
Infectious Diseases/Viral Infections
Influenza A
Influenza A virus
Influenza A Virus, H5N1 Subtype - isolation & purification
Influenza A Virus, H5N1 Subtype - pathogenicity
Influenza virus
Influenza, Human - genetics
Influenza, Human - pathology
Influenza, Human - virology
Interferon
Interferons - metabolism
Kidney - cytology
Kidney - metabolism
Kidney - virology
Lethality
Lung - cytology
Lung - metabolism
Lung - virology
Male
Microbiology
Microbiology/Immunity to Infections
Mink
Mortality
Mustela
Mutation - genetics
Nonstructural proteins
Orthomyxoviridae Infections - genetics
Orthomyxoviridae Infections - pathology
Orthomyxoviridae Infections - virology
Pandemics
Pathogenicity
Pathogens
Pathology
Replication
Respiratory Medicine/Respiratory Infections
Viral Nonstructural Proteins - genetics
Viral Nonstructural Proteins - metabolism
Virology
Virology/Animal Models of Infection
Virology/Effects of Virus Infection on Host Gene Expression
Virology/Emerging Viral Diseases
Virology/Host Antiviral Responses
Virology/Virulence Factors and Mechanisms
Virulence
Virulence (Microbiology)
Virulence - physiology
Viruses
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Title The HA and NS Genes of Human H5N1 Influenza A Virus Contribute to High Virulence in Ferrets
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