H4N8 subtype avian influenza virus isolated from shorebirds contains a unique PB1 gene and causes severe respiratory disease in mice.

TitleH4N8 subtype avian influenza virus isolated from shorebirds contains a unique PB1 gene and causes severe respiratory disease in mice.
Publication TypeJournal Article
Year of Publication2012
AuthorsBui VN, Ogawa H, Karibe K, Matsuo K, Awad SSA, Minoungou GL, Yoden S, Haneda H, Ngo LH, Tamaki S, Yamamoto Y, Nakamura K, Saito K, Watanabe Y, Runstadler J, Huettmann F, Huettman F, Happ GM, Imai K
JournalVirology
Volume423
Issue1
Pagination77-88
Date Published2012 Feb 5
ISSN1096-0341
KeywordsAmino Acid Sequence, Animals, Animals, Wild, Birds, Cell Line, Feces, Female, Humans, Influenza A virus, Influenza, Human, Japan, Mice, Mice, Inbred BALB C, Molecular Sequence Data, Phylogeny, Respiratory Tract Infections, Sequence Alignment, Viral Proteins, Virulence
Abstract

<p>H4N8 subtype avian influenza viruses were isolated from shorebirds in eastern Hokkaido. All the isolates shared >99.7% nucleotide homology, and all the viral genes except for PB1 were highly related to those of A/red-necked stint/Australia/1/04. Thus, the isolates were regarded as PB1 reassortants. The most similar PB1 gene was identified in A/mallard/New Zealand/1615-17/04 (H4N6) with nucleotide homology of 90.9%. BALB/c mice intranasally inoculated with the H4N8 isolates developed severe respiratory disease, which eventually led to death in some mice. The virus was isolated from the lungs, and viral antigen was detected in the lungs with pneumonia. Other H4 subtype viruses tested did not cause any symptoms in mice, although these viruses were also isolated from the lungs. The PB2 gene of the H4N8 isolates contains K482R, but not the E627K or D701N substitutions. The PB1-F2 gene of the isolates consists of a 101-amino acid unique sequence, but lacks the N66S mutation.</p>

DOI10.1016/j.virol.2011.11.019
Alternate JournalVirology
PubMed ID22192630
PubMed Central IDPMC3253874
Grant ListHHSN266200700010C / AI / NIAID NIH HHS / United States
HHSN266200700007C / / PHS HHS / United States
HHSN266200700009C / / PHS HHS / United States