PMID- 19058578 OWN - NLM STAT- MEDLINE DCOM- 20090217 LR - 20081208 IS - 0125-1562 (Print) IS - 0125-1562 (Linking) VI - 39 IP - 5 DP - 2008 Sep TI - Genetic characterization of nonstructural genes of H5N1 avian influenza viruses isolated in Thailand in 2004-2005. PG - 837-47 AB - The outbreak of highly pathogenic avian influenza (HPAI) viruses has severely disrupted poultry production and trade. Humans have been infected with HPAI H5N1 viruses and many have died. The nonstructural (NS) proteins of the virus are a factor that determines virulence. In this report, 80 NS genes of H5N1 HPAI viruses isolated from Thailand were completely sequenced and phylogenically analyzed. The percentages of identity and variable site NS1 genes were similar to NS2/nuclear export protein (NEP) genes. All NS1 genes from the samples were located in allelic group A. The NS1 and NS2/NEP proteins possess 225 and 121 amino acids, respectively. All NS1 protein samples had five amino acid deletions typical of avian influenza viruses isolated since 2002. An amino acid substitution at position 92 (G92E) of the NS1 protein, known to promote the inhibition of host immune responses, was also found in the samples. FAU - Suwannakhon, Narutchala AU - Suwannakhon N AD - Faculty of Medical Sciences, Naresuan University, Phitsanulok, Thailand. FAU - Pookorn, Sarutsawadee AU - Pookorn S FAU - Sanguansermsri, Donruedee AU - Sanguansermsri D FAU - Chamnanpood, Chanpen AU - Chamnanpood C FAU - Chamnanpood, Pornchai AU - Chamnanpood P FAU - Wongvilairat, Rosarin AU - Wongvilairat R FAU - Pongcharoen, Sutatip AU - Pongcharoen S FAU - Niumsup, Pannika R AU - Niumsup PR FAU - Kunthalert, Duangkamol AU - Kunthalert D FAU - Sanguansermsri, Phanchana AU - Sanguansermsri P LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - Thailand TA - Southeast Asian J Trop Med Public Health JT - The Southeast Asian journal of tropical medicine and public health JID - 0266303 RN - 0 (INS1 protein, influenza virus) RN - 0 (Viral Nonstructural Proteins) RN - 0 (Virulence Factors) SB - IM MH - Animals MH - Genome, Viral MH - Influenza A Virus, H5N1 Subtype/*genetics/*isolation & purification MH - Influenza in Birds/*virology MH - Phylogeny MH - Polymerase Chain Reaction MH - Poultry MH - Sequence Analysis, DNA MH - Thailand/epidemiology MH - Viral Nonstructural Proteins/*genetics MH - Virulence Factors/*genetics EDAT- 2008/12/09 09:00 MHDA- 2009/02/20 09:00 CRDT- 2008/12/09 09:00 PHST- 2008/12/09 09:00 [pubmed] PHST- 2009/02/20 09:00 [medline] PHST- 2008/12/09 09:00 [entrez] PST - ppublish SO - Southeast Asian J Trop Med Public Health. 2008 Sep;39(5):837-47.