TABLE 2.

IAV isolates lacking the PB1-N40 AUG codon

VirusAccession no.SubtypePB1 codon 40aLength of PB1-F2 ORFb (codons)
A/chicken/NJ/17169/1993EU743092H5N2M40L79*
A/chicken/Yokohama/aq144/2001AB256744H9N2M40L79
A/swine/Alberta/56626/03DQ280198H1N1M40I11†
A/chicken/Chis/15224/1997CY006041H5N2M40I0
A/duck/Germany/1215/1973CY014715H2N3M40I8
A/Ontario/1252/2007EU399757H3N2M40I8
A/swine/Saitama/1996AB434414H1N2M40I8
A/chicken/Laos/P0171/2007CY034718H5N1M40I8
A/northern pintail/Alaska/44204-075/2006EU557446H3N8M40I90†
A/Chicken/Hong Kong/739/94AF156422H9N2M40I8
A/partridge/Shantou/1913/2004EU050495H6N2M40I8
A/chukkar/Shantou/1530/2005EU050533H6N1M40I8
A/silky chicken/Shantou/1826/2004cCY023302H9N2M40I8
A/chicken/Hunan/774/2002CY023766H9N2M40I8
A/turkey/Shantou/1915/2004EU050496H6N2M40I8
A/chukkar/Shantou/89/2005EU050528H6N1M40I8
A/silky chicken/Korea/S3/03AY862694H9N2M40I8
  • a Substitution at PB1 codon 40.

  • b *, This ORF has a mutation in the mitochondrial targeting sequence; †, these ORFs also possess the W9L mutation.

  • c Nine related sequences from other H9N2 viruses are not shown (46).