We have seen movement at those residues within ΣPF11* previously in a very important Chinese sequence. The May 31 version of A/Shanghai/71T carried the following PF11 PB2 Polymorphisms including Virulence Factors1.
We have also noted variance within ΣPF11 and potential donor candidates in the adjacent upstream area to the Palese lab's PB2 Virulence Domain. Movement at residues coding for amino acids 674T and 677G are noted in particular and may require additional study to determine trait correlation.
674T features on a Hong Kong swine (HKswNS1659), a lab virulent Puerto Rico8 variant (LabVir_hvPF8), the last two previous Seasonal H1N1 reservoirs and is found in conjunction with 627K, the Seasonal NA Quadruple Combination (106I, 248N, 275Y, 286G) and TamiFlu Resistance on the 2009 H1N1 Seasonal specimen A/Shanghai/LWS1. 677G is found on the PF11 background throughout Europe and the US Eastern seaboard, but more importantly is in conjunction with 627K on 2006 and 2007 Indonesian H5N1 specimens.
The TamiFlu Resistant Washington29 sequence in the United States acquiring PB2 material in and around this recognised PB2 Virulence Domain begins to build a formidable virus.
1. Steel J, Lowen AC, Mubareka S, Palese P (2009) Transmission of Influenza Virus in a Mammalian Host Is Increased by PB2 Amino Acids 627K or 627E/701N. PLoS Pathog 5(1): e1000252. doi:10.1371/journal.ppat.1000252
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